Motor controller and motor control method

Abstract

The invention provides a motor controller and a motor control method. The motor control method is that a microcontroller of the motor controller receives a set value and outputs a pulse width modulation signal to a power drive circuit according to the set value, a current feedback circuit of the controller samples a current signal passing the power drive circuit, converts the current signal into a voltage signal and outputs the voltage signal to the microcontroller, a rotating speed feedback circuit of the controller samples a rotating speed signal of a rotor of a sampled motor and outputs the rotating speed signal to the microcontroller, and the microcontroller calculates a calculated value according to a specific value of the voltage signal to the rotating speed signal and adjusts the duty ratio of the pulse width modulation signal output to the power drive circuit according to the size relationship of the calculated value and the set value. The controller controls the motor by means of the motor control method. The motor controller can ensure air volume of a fan to be kept constant when the motor is applied to a fan and meet the requirements of the fan in different application occasions.

Description

technical field [0001] The invention relates to the field of motors, in particular to a controller for a brushless DC motor and a control method for the DC brushless motor. Background technique [0002] Because of its advantages of continuous speed regulation, large starting torque, good mechanical characteristics, and good controllability, brushless DC motors are becoming more and more popular and have been widely used in various electrical equipment. In addition to being provided with a stator and a rotor, the brushless DC motor is also provided with a controller for controlling the operation of the motor, which is used to control the speed regulation and commutation of the brushless DC motor. The electrical principle block diagram of a controller of a brushless DC motor is as follows: figure 1 shown. [0003] The existing controller has a microcontroller 11, which receives an externally input speed regulation signal, and the signal contains a set value. After receiving...

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Problems solved by technology

[0010] However, with the application of brushless DC motors in the field of household appliances, especially the application of fans, the constant speed control method gradually shows its disadvantages. Influenced by the specific application of the equipment

The location and installation method of the equipment are different, and the structural characteristics of the air duct are also different. Under the same input conditions, the output air volume of the fan fluctuates greatly, and even cannot meet the basic air volume output requirements.

For example, in the use of range hoods, due to the different installation positions of the equipment, the length and angle of the air duct are also very different. When the wind resistance is large, the output air volume of the fan will vary when the motor speed remains constant. decline, even unable to guarantee the timely discharge of oil fume

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