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Stepless speed regulating circuit of single-phase alternating-current motor

A technology of single-phase alternating current and stepless speed regulation, which is applied in the direction of AC motor control, electrical components, control systems, etc., can solve the problems of unstable motor operation, low power factor, large power loss, etc., and achieve a wide range of speed regulation, Easy to achieve, high reliability effect

Inactive Publication Date: 2011-05-04
孙宏斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The series inductance speed regulation of single-phase AC motors was used in early household ceiling fans. Its disadvantage is that it needs a larger inductance, which will lead to a decrease in power factor, and it is not easy to realize stepless speed regulation.
Series capacitor speed regulation also has certain applications. For example, the patent No. 02276206.X file involves a method of series capacitor speed regulation. The problem is that it requires multiple high-voltage non-polar capacitors with large capacity and large volume And can not achieve stepless speed regulation
Series resistance speed regulation will lead to high temperature heating of the resistance and large power loss, so it is rarely used
Motor tap speed regulation is widely used in household electric fans, the problem is that it is difficult to achieve low speed and stepless speed regulation
The circuit of frequency conversion speed regulation is complicated and the cost is high
There are two forms of SCR speed regulation: the speed regulation method described in the patent No. 94242180.9 has the problems of large noise and unstable motor operation; the speed regulation method described in the patent No. 94240762.8 has large noise, Prone to interference problems, so not suitable for household appliances

Method used

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  • Stepless speed regulating circuit of single-phase alternating-current motor
  • Stepless speed regulating circuit of single-phase alternating-current motor
  • Stepless speed regulating circuit of single-phase alternating-current motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: if figure 1As shown, the single-phase AC motor stepless speed regulation circuit of the present invention includes a pulse signal generating circuit for generating super-audio pulse signals, a single-phase AC switching circuit and a motor inductive current discharge circuit. The pulse signal output terminal of the pulse signal generating circuit is connected to the driving signal input terminal of the single-phase AC switching circuit, and the first AC input terminal (A terminal) of the single-phase AC switching circuit is connected to the single-phase AC motor to be controlled or its main winding , The motor inductive current discharge circuit is used to connect the two ends of the single-phase AC motor or its main winding, and the two ends of the single-phase AC are respectively connected to the second AC input terminal (B terminal) and the single-phase AC The first end of the motor or its main winding. The pulse signal generation circuit described in...

Embodiment 2

[0031] Embodiment 2: Different from Embodiment 1, there is no resistor R3 and capacitor C3 in the single-phase AC switching circuit, such as image 3 shown, its working principle and figure 2 Same; Also, the power supply of the pulse signal generation circuit in the present embodiment is by such as Figure 5 or Image 6 The power circuit shown provides it. like Figure 5 As shown, both ends of A and B are connected to single-phase AC power supply, both ends of C and D are connected to the load composed of single-phase AC motor stepless speed regulation circuit and single-phase AC motor, E and F are the positive and negative output terminals of DC power; A primary winding of the current coupler T is connected in series with any input end of the single-phase AC power supply, the capacitor C1 is connected in parallel with the load, the secondary of the current coupler T is connected to the rectifier, and the two output terminals of the rectifier are connected to the filter, a...

Embodiment 3

[0034] Embodiment three: as Figure 8As shown, the difference from the second embodiment is that the motor inductive current discharge circuit in this embodiment is different. The motor inductive current discharge circuit includes a first unidirectional electronic switch circuit and a second unidirectional electronic switch circuit symmetrically connected to both ends of the motor main winding L1, the first unidirectional electronic switch circuit includes a first triode Q1 and a first The first main circuit composed of diode D1, the anode of the first diode D1 is connected to the collector of the first triode Q1 and then connected in parallel to both ends of the main winding L1 of the motor, wherein the emitter of the first triode Q1 Connect the second end of the motor main winding L1; the second unidirectional electronic switch circuit includes a second main circuit composed of a second triode Q2 and a second diode D2, and the negative pole of the second diode D2 is connecte...

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PUM

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Abstract

The invention discloses a stepless speed regulating circuit of a single-phase alternating-current motor, comprising a pulse signal generating circuit, an single-phase alternating-current switching circuit and an inductive current leakage circuit of the motor, wherein the pulse signal generating circuit is used for generating a supersonic frequency pulse signal; the pulse signal output end of the pulse signal generating circuit is connected with the driving signal input end of the single-phase alternating-current switching circuit; the single-phase alternating-current switching circuit is connected with the controlled single-phase alternating-current motor or a main winding thereof; and the inductive current leakage circuit of the motor is used for connecting to the two ends of the single-phase alternating-current motor or the main winding thereof. According to the invention, the electric current of the motor is regulated to control the revolving speed of the motor to realize stepless speed regulation; the motor can be operated stably without vibrating, noise and interference; and fewer common electronic components are adopted, therefore, the stepless speed regulating circuit of the single-phase alternating-current motor has lower cost and small volume and is easy to realize and suitable for the use of household appliances.

Description

technical field [0001] The invention relates to a speed regulating circuit of a single-phase AC motor, in particular to a stepless speed regulating circuit of a single-phase AC motor. Background technique [0002] In the application of single-phase AC motor, it is often necessary to control the speed of the motor, so a variety of single-phase AC motor speed control circuits have appeared. At present, the common speed control circuits of single-phase AC motors generally have the following types: series inductor speed control with gears, series capacitor speed control, series resistance speed control, motor tap speed control, frequency conversion speed control with continuously adjustable speed, adjustable Silicon controlled speed regulation, etc. [0003] The series inductance speed regulation of single-phase AC motor was used in the early household ceiling fans. Its disadvantage is that it needs a larger inductance, which will lead to a decrease in power factor, and it is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/04H02P25/16
Inventor 孙宏斌
Owner 孙宏斌