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Method and control circuit for realizing multistep speed regulation of single-phase alternating current motors

A single-phase AC motor and speed regulation technology, which is applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of polluting the power grid, high motor noise, and high cost, and achieve low cost, stable operation, and low noise Effect

Inactive Publication Date: 2010-10-27
HANGZHOU ALLYTECH TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for realizing multi-level speed regulation of single-phase AC motors, which solves the problems of high cost of realizing multi-level speed regulation of existing single-phase AC motors or the problems of polluting the power grid and large motor operation noise after realization

Method used

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  • Method and control circuit for realizing multistep speed regulation of single-phase alternating current motors
  • Method and control circuit for realizing multistep speed regulation of single-phase alternating current motors
  • Method and control circuit for realizing multistep speed regulation of single-phase alternating current motors

Examples

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Effect test

Embodiment 1

[0024] like figure 1 As shown, a single-phase AC motor input current control circuit is composed of a controller 1 (STM8S103K2), a bidirectional thyristor TL connected to the controller 1, and a bidirectional thyristor TH. The bidirectional thyristor TH and the bidirectional thyristor TH The SCR TL is respectively connected to the high-speed tap 2 and the low-speed tap 3 of the single-phase AC motor.

[0025] The input current of the single-phase AC motor is divided into several continuous input cycles, and the number of input cycles is determined according to the input time, and the longer the time, the more input cycles. Each input cycle contains 8 cycles, of course, the number of cycles can be adjusted, at least two, the more the number of cycles, the more the motor speed series. But it is not that the more the better, although the more the number of stages that can be adjusted, the more. But on the one hand, it doesn't need so many series when working, on the other hand,...

Embodiment 2

[0031] like figure 2 As shown, another control circuit for the input current of a single-phase AC motor is composed of a controller 1, a triac TH connected to the controller 1, and a speed regulating reactor 4 connected in parallel with the triac TH. The output ends of the bidirectional thyristor TH and the speed regulating reactor 4 are connected to the motor, and the input ends are connected to the power supply through the switch k, so that single-phase current can be introduced.

[0032] Similarly, the input current of the single-phase AC motor is divided into several continuous input cycles, and each input cycle contains 8 cycles. After the switch k is closed, the controller 1 sends a signal to make the bidirectional thyristor TH conduct. In each input cycle of the input current, q cycles are directly input to the single-phase AC motor. At this time, the motor speed is theoretically the highest. After the input is completed, the controller 1 controls the bidirectional thy...

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Abstract

The invention discloses a method for realizing multistep speed regulation of single-phase alternating current motors. The single-phase alternating current motor comprises a low-speed tap and a high-speed tap; the single-phase alternating current motor realizes two different rotating speeds after the input current is led into the low-speed tap and the high-speed tap respectively; the input current of the single-phase alternating current motor is divided into a plurality of continuous input cycles; each input cycle contains n cyclic waves; n cyclic waves in each cycle are divided into two continuous parts and are input into the low-speed tap and the high-speed tap; and the single-phase alternating current motor adjusts the rotating speed through adjusting the wave number proportion of the two parts. The method of the invention divides the input current into a plurality of input cycles containing integral numbers of cyclic waves; each input cycle is divided into two parts to be input to the high-speed tap and the low-speed tap of the motor; the method realizes the adjustment to the rotation speed of the motor through changing proportion of the two parts, can not generate pollution to power grids, has low cost, stable motor operation and smaller noise.

Description

Technical field [0001] The invention involves the field of single -phase motor technology, especially a method and control circuit to realize a multi -level speed adjustment of single -phase AC motors. Background technique [0002] Single -phase AC motor structures are simple, fast, fast, and stable, and are widely used in household appliances such as electric fans, exhaust fans, range hoods.When the single -phase header current passes through the stator winding, the motor will produce a variable magnetic field. The strength and direction of this magnetic field will change with time as time, but it is fixed in the spatial orientation.Pulse magnetic field.This transformer pulse magnetic field can be decomposed into two rotating magnetic fields with the same speed and rotation direction as the opposite direction. When the motor rotates in a certain direction (such as rotating in the clockwise direction), then the rotating magnetic field rotating the rotating magnetic field in the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/04
Inventor 曾润涛秦华胜秦燕丽钱立俞孝锋鲍卫兵
Owner HANGZHOU ALLYTECH TECH
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