Stall delay method for permanent magnet synchronous drive motors of new energy vehicles

Abstract

The invention provides a stalling time-delay method used for a new energy automobile permanent magnet synchronous drive motor, comprising the steps of: determining whether a permanent magnet synchronous motor (PMSM) is in a stalling state; dividing position signals in a period into twelve areas; calculating an MTPA control angle; the adjustment amount of the control angle being 40% of the difference between a current position angle and a smallest position angle in an area, and multiplying a ratio parameter based on a current frequency; obtaining a stalling control angle under a stalling state; and determining whether the motor is still in the stalling state at the moment, continuing a stalling time-delay strategy if the motor is still in the stalling state and stopping stalling control if the motor is not still in the stalling state. the method can avoid the overheating of one phase in a stalling process under the condition of essentially not reducing the size of a stalling torque, thereby prolonging stalling time.

Description

technical field [0001] The invention relates to a delay method, in particular to a stall delay method for a permanent magnet synchronous drive motor of a new energy vehicle. Background technique [0002] During the working process of the permanent magnet synchronous drive motor of new energy vehicles, the locked-rotor condition of the permanent magnet synchronous drive motor is often caused by the continuous climbing of large slopes and other working conditions of the vehicle. The motor stall means that the motor still outputs torque when the speed is zero. Because the power factor of the motor is extremely low, the current when the motor is stalled can reach seven times the rated current. For permanent magnet synchronous motors in locked-rotor conditions, because the motor cannot rotate, the deviation of the effective value of the three-phase currents is relatively large at this time, and the current of a certain phase may be at the maximum value. It is easy to cause the m...

AI Technical Summary

Problems solved by technology

For permanent magnet synchronous motors in locked-rotor conditions, because the motor cannot rotate, the deviation of the effective value of the three-phase currents is relatively large at this time, and the current of a certain phase may be at the maximum value. It is easy to cause the motor winding to overheat and cause the motor to be damaged.

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