Method for controlling an electric motor
A technology on the electric motor and the motor side, which is applied to the reluctance motor system and the field of reluctance motors, can solve problems such as insufficient speed adjustment and instability, and achieve the effects of simple control, reduced computing power, and reliable control methods
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Publication Date
- 2020-03-24
Smart Images
Figure 1
Abstract
Description
technical field
[0001] The invention contemplates a method for controlling an electric motor, in particular a reluctance motor, according to the preamble of the independent method claim. Furthermore, the invention relates to an electric motor according to the preamble of the independent device claim. Furthermore, the invention relates to a system for controlling an electric motor, in particular a reluctance motor, according to the preamble of the independent system claim. Background technique
[0002] In the drive of electric vehicles, synchronous machines excited by permanent magnets are mostly used as electric motors. A disadvantage of permanent magnet excited synchronous machines is the higher cost due to the use of rare earths. Using a reluctance motor as an electric motor is an alternative to reduce costs. In order to make optimal use of the intermediate circuit voltage, regulation of electric motors is frequently used, which uses the D component of the current as th...
Examples
Embodiment Construction
[0060] figure 1 A system 100 is shown for controlling an electric motor 10 , which can be designed in particular in the form of a reluctance motor. The system 100 is used to provide a desired torque Msoll of the electric motor 10 , which is produced by two setpoint current values Idsoll, Iqsoll in the field coordinates d, q. For this purpose, according to the invention it is provided that the setpoint current values Idsoll, Iqsoll are passed through the motor-side control unit 11 by means of the operating point-dependent characteristic field Mmax (V DC ,ω ist ), Idmax(V DC ,ω ist ), Iqmax(V DC ,ω ist ) to be determined according to the applied intermediate circuit voltage V of the electric motor 10 DC and / or speed ω ist The maximum torque Mmax of the electric motor 10 and / or the two corresponding current values Idmax, Iqmax are plotted.
[0061] In order to generate a desired torque Msoll or setpoint torque of electric motor 10 , two setpoint current values Ids...