Hybrid PWM periodic peak current optimization method for electric forklift

Abstract

The invention discloses a hybrid PWM periodic peak current optimization method for an electric forklift, which belongs to the technical field of motor control, and comprises the following steps: an MCU (Microprogrammed Control Unit) acquires a signal of a rotating speed sensor based on the rotating speed sensor and calculates the rotating speed and the frequency of the motor; whether the electric forklift is in a climbing state or a high-speed running state is judged, and if yes, the MCU obtains the current value and the motor frequency of the motor in real time; adjusting the PWM switching frequency in the buffer zone based on the working state, and generating a new PWM switching frequency; and the MCU recalculates the PWM period based on the new PWM switching frequency, updates the setting parameters of the PWM signal generator, and controls the operation of the motor based on the setting parameters. The problem that the temperature rise is too fast when the output current of the controller exceeds the peak current under the specific working condition of the electric forklift can be solved, and meanwhile high-speed stable operation of the motor is guaranteed.

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