Switching frequency switching method, device and equipment for motor controller and automobile

Abstract

The embodiment of the invention discloses a switching frequency switching method and device for a motor controller, electronic equipment and an automobile, and aims to reduce voltage leap caused when the motor controller controls switching frequency switching so as to eliminate torque pulsation generated by the voltage leap of the motor. The method comprises the following steps: receiving a switching frequency switching instruction; executing a switching frequency switching instruction, and switching the switching frequency from the current switching frequency to a target switching frequency; wherein the duty ratio in the first switching period after the switching frequency switching instruction is executed is the transition duty ratio, the duty ratio in the remaining switching period after the switching frequency switching instruction is executed is recovered to be the duty ratio before the switching frequency switching, and the transition duty ratio is different from the duty ratio before the switching frequency switching.

Description

technical field [0001] The embodiments of the present application relate to the field of automobile control, and in particular, to a switching frequency switching method, device, electronic device, and automobile for a motor controller. Background technique [0002] In the field of motor control technology, the switching frequency of the motor control system is also called the control frequency. The higher the switching frequency, the more stable the motor output torque. However, high switching frequency will lead to increased switching loss, increased temperature of the power module, and reduced system efficiency. In order to reduce switching loss and improve system efficiency, the motor controller is used to control the switching frequency, adopt a low switching frequency in the low-speed section of the motor speed, adopt a high switching frequency in the high-speed section of the motor speed, and switch the switching frequency through the motor controller in different spe...

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Problems solved by technology

[0003] The problem existing in the prior art is that when the motor controller receives the switch switching command, it switches the switching frequency immediately, resulting in inconsistent voltage action time before and after the switching frequency switching, and a sudden change in the output voltage of the motor, resulting in an instantaneous current impact, which in turn produces a rotation speed. Torque ripple affects the stability of the motor speed and increases the energy consumption of the motor

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