Alternating current asynchronous motor and stepless speed regulation circuit and method thereof
An AC asynchronous motor, stepless speed regulation technology, applied in the direction of AC motor control, AC power input conversion to DC power output, irreversible AC power input conversion to DC power output, etc. Voltage distortion, etc.
Pending Publication Date: 2022-06-28
厦门浦睿智能电子有限公司
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Problems solved by technology
[0008] The invention discloses an AC asynchronous motor and its stepless speed regulation circuit and method, aiming to solve the problems of high cost, voltage distortion and power factor drop in the speed regulation of the motor in the prior art
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[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0043] In order to better understand the technical solutions of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0044] It should be understood that the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary sk...
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The invention provides an AC asynchronous motor and a stepless speed regulation circuit and method thereof.Input AC sinusoidal voltage with positive and negative half cycles is rectified into unipolar DC voltage through a rectification loop, filtering is not carried out after rectification, the rectified voltage is made to be DC steamed bun waves with the frequency being two times that of a power source, then the DC steamed bun waves pass through an H-bridge drive circuit, and the DC steamed bun waves pass through an H-bridge drive circuit. Pulse width modulation is carried out on steamed bun wave direct-current voltage in a half cycle, when a zero-crossing signal comes, the pulse width modulation is stopped, after the zero-crossing signal comes, the H bridge arm is switched to carry out pulse width modulation on the other half cycle, so that phases are repeatedly switched by taking the zero-crossing signal as a demarcation point; and finally, the alternating-current voltage which is subjected to pulse width modulation and has a sine profile is synthesized on the load, so that the problems of high cost, voltage distortion and power factor reduction in speed regulation of the motor in the prior art are solved.
Description
technical field [0001] The invention relates to the field of motor control, in particular to an AC asynchronous motor and a stepless speed regulating circuit and method thereof. Background technique [0002] Shi AC asynchronous motors are widely used in industrial equipment and various household appliances. In the field of household appliances, electric fans, air conditioners, air purifiers, dehumidifiers and other electrical equipment are more common. No matter which field it is used in, it needs to face the problem of speed regulation. There are many ways to regulate the speed of AC asynchronous motors. The traditional speed regulation methods usually include the following: [0003] (1) Multiple taps are set in the windings of the motor, and the external control circuit switches the windings through electronic or mechanical switches such as relays and thyristors to achieve the purpose of speed regulation. [0004] (2) Insert an inductor with multiple taps in series in the...
Claims
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Login to View More IPC IPC(8): H02P27/08H02M7/5387H02M1/12H02M1/14H02M7/04
CPCH02P27/08H02M7/5387H02M1/12H02M1/14H02M7/04
Inventor 徐金波陈占桩林长参
Owner 厦门浦睿智能电子有限公司