Steady speed control method for three-phase brushless DC motor
A brushed DC motor and control method technology, applied in the direction of single motor speed/torque control, electronic commutator, etc., can solve the problems that affect the constant and stable motor speed, and the motor speed is greatly affected by the load, so as to prevent vibration Effect
Active Publication Date: 2019-12-03
NORTH ELECTRON RES INST ANHUI CO LTD
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Problems solved by technology
[0003] In view of the problems in the prior art that affect the constant and stable speed of the motor, the purpose of the present invention is to provide a method for controlling the constant speed of a three-phase brushless DC motor. The vibration during the rotation process and the motor speed are greatly affected by the load, so as to ensure the smooth operation of the motor at a constant speed
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[0029] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0030] The stable speed control of the three-phase brushless DC motor of the present invention is completed through a closed-loop system. Such as figure 1 As shown, the closed-loop system includes: three-phase brushless DC motor, Hall position sensor, control CPU and motor drive circuit. Among them, the three-phase brushless DC motor is the controlled object. Under different loads, it runs at a stable speed according to the preset speed; the Hall position sensor detects the rotation phase of the brushless DC motor and the change frequency of the phase, which is used as the basis for commutation control and calculated. The actual speed of the motor; control the CPU to calculate the duty cycle ...
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The invention discloses a steady-speed control method of a three-phase brushless direct-current motor. A hall position sensor is used for detecting the rotating phase of the three-phase brushless direct-current motor and the change frequency of the rotating phase to serve as a phase change basis, converting the detected hall position signal change speed into the real-time rotating speed of the motor, controlling CPU to calculate the output voltage duty ratio of the motor according to the real-time rotating speed, executing phase change of the motor according to the phase change prediction algorithm and realizing closed-loop control of the rotating speed of the motor. According to the method, closed-loop control of the rotating speed of the motor is achieved, and it is guaranteed that the rotating speed of the motor is constant during the change process of a load. The motor hall position signal prediction algorithm can effectively prevent shaking of the motor during operation due to interference signals of the detected hall position signals.
Description
technical field [0001] The invention is applied to the technical field of constant speed control of three-phase DC brushless motors. The motor running position is determined by detecting the Hall position signal when the three-phase brushless DC motor is running, so as to calculate the motor speed. The motor speed is used to adjust the duty cycle of the motor output voltage, and the motor speed and the motor voltage duty cycle are used to construct a closed-loop control system for the motor speed, so that the motor speed is stable during the load change process. Background technique [0002] At present, in the speed control of the three-phase brushless DC motor, the inaccurate detection of the Hall position signal often causes the motor to vibrate or stall during operation. At the same time, when the load changes, the motor speed fluctuates greatly. Contents of the invention [0003] In view of the problems in the prior art that affect the constant and stable speed of th...
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IPC IPC(8): H02P6/06H02P6/16
CPCH02P6/06H02P6/16
Inventor 卢灿傅旭东李超孙帮东赵路旭
Owner NORTH ELECTRON RES INST ANHUI CO LTD