Class / Patent application number | Description | Number of patent applications / Date published |
318461000 | Speed or rate-of-movement | 48 |
20080203953 | CONTROL BANDWIDTH FOR COST EFFECTIVE AC MOTOR DRIVES IN AEROSPACE APPLICATIONS USING TWO DSP DEVICES WITH DISSIMILAR REDUNDANT INTER-PROCESSOR COMMUNICATION LINK - A digital control system for an electric motor uses two motor-control DSP's operated in parallel to provide high bandwidth motor control. Each of the two DSP's individually may have a limited processing rate (e.g. about 150 million instructions per second [MIPS]). Parallel operation of the DSP's with efficient cross-communication may facilitate motor control at a high sampling frequency. The high sampling frequency may require processing at a rate greater than the limited processing rate (e.g. greater than 150 MIPS), but the combined DSP's may provide the requisite processing speed. | 08-28-2008 |
20080246426 | Control system for multiphase rotary machines - A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the control system, a command voltage determiner determines a command voltage value for an alternating current voltage to be applied to the multiphase windings based on a zero crossing of a line-to-line current and a zero crossing of the amount of change in the line-to-line current. A driving unit drives the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings. | 10-09-2008 |
20080258664 | FAN CIRCUIT WITH A FAN SPEED CONTROL CIRCUIT - A fan speed control circuit is used for controlling rotation speed of a fan. The fan speed control circuit receives a pulse width modulation (PWM) signal from a system and comprises a programmable control unit and a current control unit. The programmable control unit receives the PWM signal, is connected to a Hall element for receiving a voltage signal therefrom, and provides a control signal. The current control unit takes the control signal to control current flowing through a stator coil unit of the fan so as to control the speed of the fan. The programmable control unit has a program written for the PWM signal, and when the fan speed control circuit is used in another system with a different PWM signal, the programmable control unit can be given a new program for the different PWM signal for controlling the speed of the fan. | 10-23-2008 |
20080258665 | Door drive control apparatus and door drive control method - A door drive control apparatus capable of an accurate detection, without misidentifying an inverse overrun condition, and a door drive control method that improves safety. The door drive control apparatus includes a power converter that supplies power to a door drive linear motor, and operates the power converter by feedback control using a speed detection value and a speed command value of the door, and controls a speed of the door. The door drive control apparatus includes a speed trouble determiner, which outputs a door inverse direction speed trouble signal in the event that the speed command value of the door exceeds either a positive or negative first setting speed, and the speed detection value exceeds a second setting speed of a polarity opposite to that of the speed command value. | 10-23-2008 |
20080303468 | CORRECTION METHOD FOR MICROPROCESSOR-CONTROLLED DIGITAL REGULATION - In a correction method for a microprocessor-controlled digital regulation of a drive motor, wherein the measurement arrangement used for the regulation of the motor is simplified. recognizing that the real value surveying cannot always be implemented periodically by the microprocessor at the requested point in time, making sporadic measurement errors of a simplified measurement arrangement ineffectual, in accordance with the method individual measurement values with a sudden change are read out and correction values are used instead of these for the regulation. | 12-11-2008 |
20080315816 | Motor Control Device And Compressor - A motor control device performing vector control for a motor that drives a load whose load torque varies periodically. The motor control device has: a motor speed deriving portion estimating or detecting a motor speed; a speed controller producing a specified torque current value such that the motor speed is made to follow a specified motor speed value fed from outside; a resonance filter producing a corrected torque current value by receiving a control value that varies with variations in the load torque and emphasizing a periodic variation component of the control value; a torque current corrector producing a specified superimposed torque current value by superimposing the corrected torque current value on the specified torque current value; and an adjusting portion adjusting, based on the specified superimposed torque current value, a degree of emphasis placed on the variation component by the resonance filter. The vector control is performed according to the specified superimposed torque current value. | 12-25-2008 |
20090001915 | METHOD AND APPARATUS FOR ACTIVE VOLTAGE CONTROL OF ELECTRIC MOTORS - Methods and apparatus are provided for dynamic voltage control of electric motors. An inverter provides an output voltage to an electric motor based on a gate voltage. The method includes determining a speed of the electric motor and modifying the gate voltage based on the speed of the electric motor. The apparatus includes a gate drive circuit and a controller coupled to the gate drive circuit. The gate drive circuit provides a gate voltage to a switch network, and the switch network produces the output voltage in response to the gate voltage. The controller modifies the gate voltage based on a speed of the electric motor. | 01-01-2009 |
20090001916 | MOTOR CONTROLLING DEVICE AND METHOD TEHREOF - A motor controlling device and a motor controlling method are provided. The motor controlling device includes a first sensor, a second sensor and a signal switching circuit. The signal switching circuit is electrically connected to the first and second sensors, respectively. The signal switching circuit is switched to the first sensor to output a first switching phase signal to drive a motor when the motor starts to operate. The signal switching circuit is switched to the second sensor to output a second switching phase signal to drive the motor when a predetermined switching condition is satisfied with a predetermined value during the motor operation. | 01-01-2009 |
20100117578 | GARAGE DOOR OPENER - This invention relates generally to a garage door opener. The garage door opener has a user interface and an integrated motor operatively connected to the garage door. The integrated motor has a motor drive and an integrated motor control circuit. The integrated motor control circuit has a motor control microprocessor. | 05-13-2010 |
20100171456 | VOLTAGE SOURCE INVERTER WITH A VOLTAGE OFFSET - Methods and apparatus are provided for operation of a voltage source inverter. A method of operating a voltage source inverter having an output with multiple voltage phases having a DC voltage level, the method comprising sensing a low output frequency condition; determining a DC voltage offset responsive to the low output frequency condition; and applying the DC voltage offset when operating the voltage source inverter resulting in a change to the DC voltage level of the multiple voltage phases. | 07-08-2010 |
20100244758 | FAN DEVICE WITH IMPROVED SPEED CONTROL MODULE AND PLURAL FAN SYSTEM CONSTRUCTED THEREBY - A fan device with improved speed control module includes a stator, a rotor, and a speed control module. The stator has a driving unit outputting currents for the stator to generate alternative magnetic fields and thus turn the rotor. The speed control module includes a control unit and a speed adjusting circuit, with the control unit generating a control command for the driving unit and further outputting a state signal for the speed adjusting circuit to control whether a PWM signal enters the control circuit or not. | 09-30-2010 |
20110043151 | MOVABLE UNIT DRIVING APPARATUS - A movable unit driving apparatus which drives a movable unit by a motor, the movable unit driving apparatus includes a first detection unit configured to detect that the movable unit passes a first position; a second detection unit configured to detect that the movable unit passes a second position after the first detection unit detects that the movable unit has passed the first position; a first measurement unit configured to measure time from when the first detection unit detects that the movable unit passes the first position to when the second detection unit detects that the movable unit passes the second position; and a setting unit configured to set time from when the movable unit is detected to have passed the second position to when a brake is applied to the motor based on the time measured by the first measurement unit. | 02-24-2011 |
20110050142 | SYSTEM AND METHOD FOR MOTOR SPEED ESTIMATION OF AN ELECTRIC MOTOR - A system and method for a motor management system includes a computer readable storage medium and a processing unit. The processing unit configured to determine a voltage value of a voltage input to an alternating current (AC) motor, determine a frequency value of at least one of a voltage input and a current input to the AC motor, determine a load value from the AC motor, and access a set of motor nameplate data, where the set of motor nameplate data includes a rated power, a rated speed, a rated frequency, and a rated voltage of the AC motor. The processing unit is also configured to estimate a motor speed based on the voltage value, the frequency value, the load value, and the set of nameplate data and also store the motor speed on the computer readable storage medium. | 03-03-2011 |
20110133680 | FAN SPEED CONTROL METHOD - The invention relates to a method of control fan speed in a fan speed control system having a cooling fan driven by a motor, a motor driver for driving the motor at a speed corresponding to a fan speed control signal, and an electronic control unit (ECU) for generating the fan speed control signal. The method includes generating a fan speed control signal and communicating the fan speed control signal to the motor driver so that the motor driver drives the motor at a speed corresponding to the fan speed control signal. If the fan speed control signal is at a level below a noisy fan speed range, then the ECU maintains the fan speed control signal below the noisy fan speed range until the ECU commands a fan speed above the noisy fan speed range. If the fan speed control signal is at a level above the noisy fan speed range, then the ECU maintains the fan speed control signal at a level above the noisy fan speed range until the ECU commands a fan speed below the noisy fan speed range. The method may also include generating a minimum fan speed control signal so that the motor driver drives the motor at a lowest speed that will allow the cooling fan to provide a desired cooling effect. | 06-09-2011 |
20110266991 | SEAT ADJUSTING DEVICE - A seat adjusting device for an automobile seat ( | 11-03-2011 |
20120032623 | METHOD OF CONTROLLING FAN SPEED - A method of controlling fan speed is provided. The method includes: setting a target speed of the fan; providing an actual control speed signal and using the actual control speed signal to drive the fan so as to obtain an actual speed of the fan; determining whether the actual speed of the fan is equal to the set target speed; and when the actual speed of the fan is equal to the set target speed, continuously using the provided actual control speed signal to drive the fan, otherwise, gradually compensating the intensity of the provided actual control speed signal until the actual speed of the fan is equal to the set target speed after the fan is driven by the gradually compensated actual control speed signal. | 02-09-2012 |
20120068651 | GENERATOR DRIVE SYSTEM FOR AN INTERNAL COMBUSTION ENGINE - A generator drive system for the generator ( | 03-22-2012 |
20120086377 | MOTOR CONTROL METHOD - A motor control apparatus and a motor control method determine whether the motor is in a back-pressure area so as to provide different rotation-speed control signals. When the fan is in the low duty cycle, a first circuit loop is switched on, so that the fan has more accurate rotation speed. When the fan is in the high duty cycle, a second circuit loop is switched on, so that the rotation speed of fan does not be limited to a constant rotation-speed as the fan enters the back-pressure area. Thus, the fan has larger airflow quantity and higher airflow pressure. | 04-12-2012 |
20120194115 | MULTI-SPEED CONTROL APPARATUS FOR FAN MOTOR - Disclosed is a multi-speed control apparatus for a fan motor. The apparatus includes a driving member, a motor speed sensing member, a resistor circuit, a voltage-division resistor, and a multi-segment switch. The driving member has a controlled end connected with the multi-segment switch. The driving member has an output end connected with the fan motor. The driving member has a detection end connected with the motor speed sensing member. The resistor circuit includes some resistors with various resistances. The multi-segment switch interconnects the resistor circuit, the voltage-division resistor, the controlled end of the driving member, and a voltage source. This switch is optionally connected to the resistor disposed in the voltage source or voltage-division resistor. An input voltage is created across the resistor by dividing the voltage. The driving member is therefore provided for driving the fan motor to a rotating speed according to the input voltage. | 08-02-2012 |
20120235620 | Electrical Actuator And Method For Controlling Such An Actuator - The actuator ( | 09-20-2012 |
20120256577 | Motor Control Apparatus and Method - When it is determined that the number of times that motor rotation-indicative quantity has been detected has exceeded a measurement interval, a feedback speed value is calculated from a motor rotation-indicative quantity detected immediately before, a motor rotation-indicative quantity detected immediately before the last time a measurement interval determination means determined that the number of times had exceeded the measurement interval, and time that has elapsed since the last time the measurement interval determination means determined that the number of times had exceeded the measurement interval, and the measurement interval having a length calculated from a greater one between the calculated feedback speed value and a speed command value is set for the measurement interval determination means to refer to. | 10-11-2012 |
20130020977 | MOTOR SPEED DETECTION APPARATUS AND MOTOR CONTROL APPARATUS - The motor speed detection apparatus detects rotational speed of a motor. The apparatus includes an FG coil ( | 01-24-2013 |
20130057189 | REVOLUTION STABILIZATION CONTROL (RSC) SYSTEM - The present invention converts conventional electric motors into dual rotational machines. The extreme novelty and utility of such an apparatus rests with the fact that it offers a revolutionary method of precision RPM control to accessory systems that could become far more effective and efficient if run at speeds independent of the RPM produced by the primary drive source said accessory systems are coupled to. Conversion of conventional motors consists of precision modification and balancing of a motors case/stator sufficient to maintain a steady state RPM consistent with the needs of dependant accessory systems. Superimposing a method of coupling accessory systems to the drive speeds of the present inventions case/stator suggests many options—e.g. drive belt pulley. Attachment to a primary drive source could be a simple bore through the rotor assembly. | 03-07-2013 |
20130063064 | MOTOR CONTROL APPARATUS - There are provided a first notch filter disposed in a feedback control system, an oscillation extracting filter for outputting signal x | 03-14-2013 |
20130082631 | ELECTRIC POWER TOOL, LOCK STATE OCCURRENCE DETERMINATION APPARATUS, AND PROGRAM - A lock state occurrence determination apparatus includes a counter, a reset device, a reference time changing device, a lock state determination device, and an invalidation device. The invalidation device performs, in a case where a false determination of occurrence of a lock state of a motor is caused by the lock state determination device due to an operation input to operate a rotation speed of the motor, at least one of a first invalidation operation to invalidate the lock state determination device and a second invalidation operation to invalidate continuation of a counting operation by the counter. | 04-04-2013 |
20130314018 | APPARATUS AND METHOD FOR CONTROLLING MOTOR SPEED - The present invention relates to an apparatus and a method for controlling a motor speed. In accordance with an embodiment of the present invention, an apparatus for controlling a motor speed including: a speed difference detecting unit for calculating a difference between a motor control speed and a detected motor speed; a duty generating unit for changing a duty according to the speed difference detected by the speed difference detecting unit and duty update time adjustment; and a time adjusting unit for adjusting a duty update time according to a duty variation in the duty generating unit is provided. Further, a method for controlling a motor speed is provided. | 11-28-2013 |
20140035505 | Hybrid Closed Loop Speed Control using Open Look Position for Electrical Machines Controls - A method of controlling speed of an electric machine having a rotor and a stator is provided. The method may comprise the steps of monitoring a desired speed and a measured speed of the rotor, generating a torque command based on the desired speed and the measured speed, and controlling phase current to the stator based on a hybrid closed loop analysis of the torque command, the measured speed and an estimated position of the rotor. The estimated rotor position may be derived at least partially from the desired speed. | 02-06-2014 |
20140062369 | APPARATUS AND METHOD FOR CONTROLLING SPEED OF MOTOR - An apparatus for controlling a speed of a motor, includes: a first duty change detection unit detecting a change in duty of a PWM signal supplied from the outside; a speed conversion unit converting a speed indication (command) having the PWM signal into an actual speed value (RPM value) based on the change in duty detected by the first duty change detection unit; a speed control unit generating a new speed indication value to be applied to a motor and determining the duty value of PWM signal based on the new speed indication value; a second duty change detection unit detecting the change in the duty value of PWM signal determined by the speed control unit; and a PWM generation unit generating the PWM signal actually applied to the motor based on the change in the duty value detected by the second duty change detection unit. | 03-06-2014 |
20140062370 | APPARATUS AND METHOD FOR CONTROLLING SPEED OF MOTOR - Disclosed herein are an apparatus and a method for controlling a speed of a motor. An apparatus for controlling a spaced of a motor according to an exemplary embodiment of the present invention includes: a PWM conversion unit detecting a hall sensor signal from a motor to output a pulse width modulated signal corresponding to the detected hall sensor signal; a duty detection unit detecting a duty value of the pulse width modulated signal output by the PWM conversion unit; an error calculation unit comparing a PWM duty input from the outside with a duty detected by the duty detection unit to obtain an error; and a speed control unit controlling a speed of a motor based on an error obtained by the error calculation unit. | 03-06-2014 |
20140139164 | APPARATUS AND METHOD FOR CONTROLLING MOTOR DRIVING AND MOTOR USING THE SAME - There are provided an apparatus and a method for controlling motor driving and a motor using the same. The motor driving control apparatus according to an embodiment of the present invention includes a driving signal generating unit generating a driving signal for a motor apparatus; a speed detecting unit detecting a rotational speed of the motor apparatus; and a controlling unit monitoring an instantaneous speed and an average speed using the rotational speed and comparing the instantaneous speed with the average speed to determine an occurrence of an abnormal state in the motor apparatus. | 05-22-2014 |
20140159633 | MOTOR CONTROL APPARATUS AND METHOD - There are provided a motor control apparatus and method. The motor control apparatus includes: a signal generating unit generating a first signal; a sampling unit obtaining the numbers of pulses of the first signal included in a plurality of sampling sections having different start timings, respectively; and a calculating unit calculating a speed of a motor using the numbers of pulses of the first signal obtained with respect to the plurality of sampling sections. | 06-12-2014 |
20140184122 | CONSTRUCTION MACHINE - A construction machine includes: a swing structure ( | 07-03-2014 |
20140306633 | MOTOR CONTROL DEVICE, IMAGE FORMING APPARATUS, AND MOTOR CONTROL METHOD - A motor control device includes a measuring unit configured to output a measurement value corresponding to a rotation speed of a motor; and a control unit configured to control driving of the motor such that the measurement value makes closer to a target value. When the measurement value does not exceed a predetermined abnormality determination threshold, the control unit controls the driving of the motor based on a difference between the measurement value and the target value. The abnormality determination threshold is set in a positive direction or in a negative direction with reference to the target value. When the measurement value exceeds the abnormality determination threshold, the control unit controls the driving of the motor based on a difference between a corrected measurement value and the target value. The corrected measurement value is set in the same direction as the direction in which the abnormality determination threshold is set. | 10-16-2014 |
20140354202 | MOTOR CONTROL DEVICE - A motor control device controls a speed of a motor. The motor control device includes: a target speed generating unit that generates a target speed; a speed detecting unit that detects a current speed of the motor; a speed comparing unit that compares the target speed with the current speed to calculate a speed error; an error amplifying unit that amplifies the speed error and outputs a control value; and a motor driving unit that drives the motor in accordance with the control value. The error amplifying unit has proportional integral characteristics by which the speed error is amplified with a proportional gain and integration is performed in a lower frequency range than an integral corner frequency, increases the proportional gain as the current speed is higher, and shifts the integral corner frequency to a lower frequency as the current speed is higher. | 12-04-2014 |
20140368146 | POWER CIRCUIT FOR DIFFERENT FANS - A power circuit for different types of fans includes first through sixth terminals, a control chip, first through third loads, and a connector. If a 3-pin fan is connected to the connector, only the first load connects the first and second terminals, and a control pin of the connector is idle. If a 4-pin fan is connected to the connector, the second load connects the third and fourth terminals, the third load connects the fifth and sixth terminals, and the first load does not connect the first and second terminals. The control pin receives a divided voltage to control fan speed. | 12-18-2014 |
20150015172 | MOTOR CONTROLLER - The present invention relates to a motor controller which includes a motor; an oscillator for generating a clock signal; a speed detection unit for detecting the rotational speed of the motor from a pulse signal generated according to the rotation of the motor and the clock signal; and a sampling period determination unit for determining a sampling period by compensating an error generated in the oscillator and provides an useful effect that can precisely control the rotational speed of the motor in spite of the error of the oscillator. | 01-15-2015 |
20160013742 | MOTOR DRIVING CIRCUIT, COOLING DEVICE AND ELECTRONIC APPARATUS INCLUDING THE SAME | 01-14-2016 |
20160061507 | Variable Speed Compressor Control with Lost Rotor Mitigation - A drive controller for a motor of a compressor includes a drive circuit that applies voltages to windings of the motor. A speed control module controls the drive circuit to rotate the motor at a requested speed. A speed determination module generates the requested speed based on a speed demand from a system controller. A lost rotor control module identifies a lost rotor condition and, in response to identifying the lost rotor condition, instructs the speed determination module to set the requested speed to an override speed that is lower than the speed demand. The lost rotor control module identifies the lost rotor condition in response to a comparison of a speed error with an adaptive threshold. The speed error is based on a difference between requested and estimated speeds of the motor. During first and second system states, the adaptive threshold is set to first and second thresholds, respectively. | 03-03-2016 |
20160149534 | MOTOR CONTROL SYSTEM OF ELECTRIC VEHICLE AND CONTROLLING METHOD FOR MOTOR CONTROL SYSTEM OF ELECTRIC VEHICLE AND ELECTRIC VEHICLE - A motor control system of an electric vehicle, a controlling method for the motor control system and an electric vehicle are provided. The motor control system includes: an IGBT module, connected with a motor of the electric vehicle; a detection module, configured to detect a motor speed; a drive module, configured to drive IGBTs in the IGBT module to turn on or off so as to control the motor to work or stop working; a first control module; a second control module communicated with the first control module; and a channel selection module, configured to select a channel of the second control module when the first control module has a fault. When the second control module is selected, it sends a second control signal to the drive module according to the motor speed at a predetermined time before the first control module has the fault, so as to control the motor to stop working. | 05-26-2016 |
20160254763 | CONNECTING DEVICE FOR MOTOR AND SUPPLY NETWORK | 09-01-2016 |
318463000 | Tachometer-type detector | 2 |
20120086378 | FAN ROTARY SPEED CONTROLLING DEVICE - A fan rotary speed controlling device includes a base voltage generating circuit, a first voltage generating circuit, a second voltage generating circuit and a compensation controlling circuit. The base voltage generating circuit receives a pulse width modulation signal and outputs a base voltage signal. The first voltage generating circuit receives the pulse width modulation signal and generates a first voltage signal according to the pulse width modulation signal. The second voltage generating circuit receives a fan rotary speed signal and generates a second voltage signal according to the fan rotary speed signal. The compensation controlling circuit outputs a voltage deviation compensation signal according to the first voltage signal and the second voltage signal. Hence, the fan rotary speed controlling device provides a stable rotary speed. | 04-12-2012 |
20150130385 | MOTOR CONTROL DEVICE, IMAGE FORMING APPARATUS, MOTOR CONTROL METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - A motor control device includes a motor lock state determining unit configured to determine whether a motor is in a rotation lock state; a position hold state determining unit configured to determine whether the motor is in a position hold state; a lock detection invalidation determining unit configured to invalidate the determination of the lock state when the motor is in the position hold state and when a predetermined condition is satisfied; a position error correction unit configured to correct an error of a target stop position of the motor when the determination of the lock state is invalidated; and a motor control unit configured to change a rotation direction of the motor in a time shorter than a time in which the motor lock state determining unit determines the lock state when the motor is in the position hold state after the error is corrected. | 05-14-2015 |
318465000 | In excess of a predetermined valve | 6 |
20080265818 | Protective device for a power-assisted steering system - A protective device for a power-assisted steering system, such a power-assisted steering system, and a method for protecting a power-assisted steering system are described. Provided in the described power-assisted steering system is a circuit that closes a separation in the neutral point of an electric motor when the rotational speed of the electric motor exceeds a prespecified value. | 10-30-2008 |
20080297087 | Apparatus and Method for Controlling a Motor - A motor control device is disclosed that reduces the shock caused by torque increase during switching output of a motor's power generator from PWM wave voltage driving to square-wave voltage driving. Switching of PWM wave voltage driving and square-wave voltage driving is determined based on rotation speed of the motor and a torque instruction value. When switching from PWM wave voltage driving to square-wave voltage driving occurs, the voltage output of the power generator is reduced. When generated voltage V drops below a specified threshold voltage, PWM wave voltage driving is switched to square-wave driving. | 12-04-2008 |
20100148713 | MOTOR SPEED CONTROLLER - A speed controller used in a control loop of a motor includes a comparator, a processing device, and an arithmetic logical unit (ALU). The comparator compares a received instruction speed or a received measured speed of the motor with a predetermined speed value, outputs a first signal to the processing device when the received speed is greater than the predetermined speed value, or outputs a second signal to the processing device when the received speed is equal to or less than the predetermined speed value. The processing device receives a speed difference between the instruction speed and the measured speed. The processing device outputs a first proportional value when the first signal is received, or outputs a second proportional value when the second signal is received. The ALU outputs an instruction current to the control loop by calculating the proportional value according to a predetermined calculation rule. | 06-17-2010 |
20120181966 | MOTOR SPEED CONTROL CIRCUIT - A motor speed control circuit includes: a first determining circuit configured to determine whether a rotation speed of a motor is higher than a set first rotation speed based on a speed signal corresponding to the rotation speed; a second determining circuit configured to determine whether the rotation speed is higher than a set second rotation speed, which is higher than the first rotation speed, based on the speed signal; and a drive signal output circuit configured to output to a drive circuit configured to drive the motor a drive signal for increasing the rotation speed when the rotation speed is lower than the first rotation speed and decreasing the rotation speed when the rotation speed is higher than the second rotation speed, based on determination results of the first and second determining circuits. | 07-19-2012 |
20130119911 | WIPER CONTROL - The invention relates to a method for controlling the movement of a wiper blade over a wiping surface, including the steps of moving the wiper blade up and down over the wiping surface between a lower turning position and an upper turning position, detecting a requirement to stop the wiper blade, moving the wiper blade downward into a lower end position and from there upward into a first parking position in the event that a reversing signal is present, and stopping the wiper blade. To this end, the wiper blade is moved into the lower end position only if previously thereto low mechanical resistance against the movement of the wiper blade over the wiping surface was determined. | 05-16-2013 |
20140354203 | REVERSE ROTATION DETECTION AND OVERSPEED PROTECTION FOR POWER TOOL WITH BRUSHLESS MOTOR - A reverse rotation detection module is provided for a power tool having an electric motor intended to rotate in a first direction but not an opposite second direction. The reverse rotation detection module is comprised of: a switching arrangement having a plurality of motor switches; three position sensors; a first latch circuit; a second latch circuit; and a motor driver module that is configured to receive the shutdown signal from the second latch circuit and discontinue driving the motor in response to the shutdown signal. An overspeed protection module is provided for a handheld power tool. The overspeed protection module is comprised of: an electric motor; a switching arrangement having a plurality of motor switches; a diode pump circuit; a comparator circuit; and a motor driver module that is configured to receive a shutdown signal from the comparator circuit and discontinue driving the motor in response to the shutdown signal. | 12-04-2014 |