Method for controlling rotation rate of electric motor

摘要

A method for controlling a rotation rate of an electric motor includes the s following steps: determining if an absolute value of a difference between an objective rotation rate of the electric motor and an actual rotation rate of the electric motor is greater than or equal to a predetermined value, and if yes, compensating a q axis current of the electric motor to adjust the rotation rate.

主权项

1. A method for controlling a rotation rate of an electric motor, comprising:
determining if an absolute value of a difference between an objective rotation rate of the electric motor and an actual rotation rate of the electric motor is greater than or equal to a predetermined value; and if yes, compensating a q axis current of the electric motor to adjust the rotation rate, wherein compensating a q axis current of the electric motor to adjust the rotation rate comprises:
compensating a q axis current of the electric motor according to the equation Iq′=Iq−K*Δn,where K is a coefficient, Iq′ is an actual value of the q axis current, Iq is a given value of the q axis current, and Δn is a difference between an average of an actual rotation rate during current N cycles and an average of an actual rotation rate during N cycles before the current N cycles, and N≧1; andcompensating a torque by compensating the q axis current of the electric motor to adjust the rotation rate.