Motor speed regulation circuit, method and device
A motor speed regulation and circuit technology, applied in the direction of AC motor control, electrical components, control systems, etc., can solve the problem of unstable motor speed and achieve the effect of avoiding unstable speed and stabilizing the speed
Active Publication Date: 2019-12-06
GD MIDEA ENVIRONMENT APPLIANCES MFG +1
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Problems solved by technology
[0004] The invention provides a motor speed regulation circuit, method and device, aiming to solve the technical problem of unstable motor speed when the mains voltage changes
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no. 1 example
[0078] Based on the first embodiment, a second embodiment of the motor speed control method of the present invention is proposed, refer to image 3 In this embodiment, step S30 includes:
[0079] Step S31, calculating the voltage difference between the acquired voltage and the preset voltage;
[0080] Step S32, calculating the voltage ratio between the voltage difference and the preset voltage;
[0081] Step S33: When the acquired voltage is greater than the preset voltage, increase the on-duration of the first switch K1 in the current period and decrease the second switch in the current period based on the voltage ratio. The on-time of K2.
[0082] In this embodiment, if the voltage detected by the detection terminal is 357V, the voltage difference between the detected voltage and the preset voltage is: 357V-311V=47V, and the ratio of the voltage difference to the preset voltage is the voltage ratio It is: 47V / 311V=15%, and the process of increasing the on-duration of the first swit...
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The invention discloses a motor speed adjustment circuit which comprises a first switch, a second switch, a first rectification module, a second rectification module and a pulse controller, wherein when the first switch is turned on and the second switch is turned off, the first switch and the first rectification module are connected in parallel to two ends of a motor; voltage at two ends of the second switch is input voltage of the motor; and the pulse controller adjusts the conduction time lengths of the first switch and the second switch in the current period according to voltage detected by the detection end. The invention further discloses a motor speed adjustment method and device. According to the motor speed adjustment circuit, by comparison of the voltage at the detection end of the pulse controller when the first switch is turned on and the second switch is turned off with preset voltage, the conduction time length of the first switch and the conduction time length of the second switch in the current period are adjusted, so as to adjust current of the motor to stabilize the rotating speed of the motor; and therefore, the phenomenon of unstable rotating speed caused by fluctuation of mains voltage in an operating process of the motor is avoided.
Description
Technical field [0001] The present invention relates to the technical field of motors, in particular to a motor speed regulating circuit, method and device. Background technique [0002] In the application of single-phase AC motors, it is often necessary to control the speed of the motor, so a variety of single-phase AC motor speed regulating circuits have appeared. The current common single-phase AC motor speed control circuits are roughly as follows: series inductance speed control with gears, series capacitor speed control, series resistance speed control, motor tap speed control, variable frequency speed control with continuously adjustable speed, SCR speed control, etc. [0003] Existing speed control schemes that rely on adjusting the duty cycle of PWM to adjust the speed of the motor. When the duty cycle of PWM is locked, if the input voltage (ie, the mains voltage) changes, the speed of the motor will also correspond. The change of the motor speed leads to unstable rotati...
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IPC IPC(8): H02P25/04
CPCH02P25/04
Inventor 郭新生
Owner GD MIDEA ENVIRONMENT APPLIANCES MFG