20120169260 | Method and Device for Compensating for Load Factors in Permanently Excited Motors - The invention relates methods and devices for compensating for load factors in permanently excited motors, wherein the rotor position is determined from the inductivities of the phases. The methods and devices are characterized by a stabilization of the inductivity-based signals for the determination of the position of the rotor in permanently excited motors against load factors. To this end, advantageously current-dependent faults of the angular values determined during the operation of the motor are corrected. For this purpose, in order to correct the inductivity-based determination of the position of the rotor, in a measuring device either the phase currents are measured or the intermediate circuit current is captured. Furthermore, including at least one motor-specific characteristic value, at least one current-dependent correction value, which is determined from said characteristic value, is applied in a correction device against the inductivity-based signals, which result from the inductivity-based determination of the position of the rotor, of a device for determining the inductivities such that switch states, which are loaded with the correction value by a control device and thus are corrected, are present at a converter for actuating the motor. | 07-05-2012 |
20120181962 | Method and Device for Monitoring and Correcting a Sensorless Rotor Position Detection in Permanently Excited Motors - The invention relates to methods and devices for monitoring and correcting a sensorless rotor position detection in permanently excited motors, comprising a control device and a current converter. The invention is especially characterised in that the ambiguity of the rotor position determined from the inductance ratios of the motor, in permanently excited motors, can be resolved in a simple manner without a sensor, and a defectively determined angle can be corrected as required. To this end, during the operation of the motor, the rotor position is detected by means of an inductance-based detection device. Furthermore, the rotor position is monitored in relation to the ambiguity of the inductance-based signals by means of a monitoring/correcting device, and where necessary, an occurring angle error corrected, the currents in the motor being modified. | 07-19-2012 |