A Method for Improving the Working Reliability and Safety of High-Voltage Brushless DC Motor

Abstract

The invention provides a method of improving work reliability and safety of high-voltage brushless DC motor. A middle softening module is added in the motor controller work logic, and thereby the motor can gradually increase duty ratio output under the situation of sudden loading, overloading and locked rotor, and the rated rotor speed can be achieved, and thereby the problems that the motor controller drives current to work for a long time and the motor will be burned out when sudden loading, overloading, locked rotor, and sudden declining of rotating speed occur can be prevented; the over-current risk of the controller can be effectively reduced, and the reliability and safety of products can be increased; when the loading of the brushless DC motor changes, the strong recovering ability of rotating speed can be maintained.

Description

technical field [0001] The invention belongs to aviation electrical design technology, in particular to a method for improving the working reliability and safety of a high-voltage brushless DC motor. Background technique [0002] At present, the high-voltage brushless DC motor controller adopts such as figure 1 The control flow, PI control diagram such as figure 2 . The DSP uses the interrupt method to adjust the speed in a loop. Each time, it first calculates the required PWM wave duty cycle according to the current speed; Send the final duty ratio value to the PWM control register of DSP to obtain the PWM wave output of the required duty ratio to control the energy input of the motor to ensure that the motor maintains the rated speed under different loads. [0003] However, this control logic has a serious problem in actual use, that is, when the motor stalls, the duty cycle of the PI output will increase due to the large difference between the current speed and the ta...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention proposes a method for improving the working reliability and safety of the high-voltage brushless DC motor. By adding an intermediate soft-start module to the working logic of the motor controller, the sudden load and overload 1. In the case of a stalled rotor, the motor can gradually increase the duty ratio output and softly start to the rated speed, which can avoid the problem of excessive drive current of the motor controller for a long time or even burning out when sudden load, overload, or stalled rotor

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