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Electronic actuator of single-phase asynchronous electric motor

A starting switch, single-phase asynchronous technology, applied to the starter of a single single-phase induction motor, motor generator/starter, etc., can solve the problems of large volume, short service life and poor operation reliability of the electronic starting switch, and achieve High instantaneous power, long life, reliable effect

Inactive Publication Date: 2007-04-04
蔡宗法
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantages of the electronic starting switch for single-phase asynchronous motors in the prior art, such as large volume, short service life and poor operation reliability, the present invention provides an electronic starting switch for single-phase asynchronous motors with small size, long service life and reliable operation

Method used

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  • Electronic actuator of single-phase asynchronous electric motor
  • Electronic actuator of single-phase asynchronous electric motor
  • Electronic actuator of single-phase asynchronous electric motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Referring to Fig. 1 and Fig. 4, an electronic start switch for a single-phase asynchronous motor includes an electromagnetic relay 2, an electronic control circuit 1 for controlling the pull-in and break-off of the relay, and the moving contact of the relay K Connected between the auxiliary winding L2 of the motor and the power supply; the rated duty system of the relay K is a duty cycle in which the energized time and the non-energized time cycle alternately, and the relay cannot reach thermal balance during the energized time; the coil of the relay K is connected to the The high-voltage semiconductor switch V1 is connected in series, and the high-voltage semiconductor switch V1 is connected to the mains power supply. The peak value of the rated operating voltage of the relay K coil and the peak value of the mains power supply voltage are approximately equal in absolute value.

[0038] In the electronic control circuit 1, the commercial power supply is con...

Embodiment 2

[0042] Embodiment 2: Referring to Fig. 1 and Fig. 4, according to the instruction manual of the original relay in embodiment 1, the highest working voltage of the coil of the original relay under the uninterrupted duty system is V 1 =48×1.2=57.6(V). It can be estimated from the electrical principle that the effective value of the relay is V 2 = Under the working voltage of 220V, the allowable power-on duration rate is about

[0043] q≤(V1 / V2) 2 ×100%=(57.6 / 220) 2 ×100%≈6.9%. Here it is assumed that the temperature of the relay coil is the same under the two working systems.

[0044] When the operating condition of the relay modified in embodiment 1 is changed to the frequency of motor starting operation as n=120 times / hour, the duration of each starting process is t=2 seconds, and the operating voltage of the relay coil is still the mains alternating current 220V The pulsating voltage obtained after the voltage is half-wave rectified and filtered by a 4.7μf capacitor, throu...

Embodiment 3

[0046] Embodiment 3: The relay in Embodiment 1 is still used, and the relay is started from a cold state, and the pulsating voltage obtained by applying a commercial AC 220V voltage to the coil after half-wave rectification and filtering by a 4.7 μf capacitor. After 12 seconds, the temperature rise of the relay coil reaches 50°C, and the temperature of the surrounding environment is 35°C. This is an example of short-time work. Explain that in the short-time duty system, the same relay, which allows the motor to start the process, takes longer than the intermittent cycle duty system.

[0047] In other words, compared with the intermittent duty cycle, the same motor starting time and the same relay power, the volume of the short-time duty relay can be made smaller.

[0048] The above implementation plan is realized by transforming the original relay. Of course, it is not the best solution, but it can already meet the needs of starting the single-phase double-value capacitor asy...

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Abstract

The invention is concerned with electron start switch of single-phase asynchronous motor, which relates to electromagnetism relay and electron control circuit for controlling the close and disconnection of the said relay. It uses the special work character for the relay of the motor with a low holding ratio in the work condition, to offer a kind of relay with break and continue period work state or short time work state designed for electron start switch of single-phase asynchronous motor. The rating work voltage of relay is high voltage and supplied by city voltage without reducing voltage through transformer. The relay has large instantaneous power and long life-time in small volume. The said electron start switch of single-phase asynchronous motor is suit for fixing and maintaining with low cost and high dependability.

Description

(1) Technical field [0001] The invention relates to an electronic starting switch of a single-phase asynchronous motor. (2) Background technology [0002] Single-phase asynchronous motors with high starting torque have a start switch. When the motor is just started, the start switch is closed, and the auxiliary winding L2 of the motor is connected to the power supply through the starting element or directly. After the motor starting process is over, the starting switch should be disconnected in time, and the starting element should be cut off, or the connection between the auxiliary winding L2 of the motor and the power supply should be cut off, otherwise the starting element and the motor will be damaged. The auxiliary winding of the motor is also called the secondary winding of the motor. [0003] There are several types of starter switches, such as starter relays and centrifugal switches. The starter relay is an electromagnetic relay, and its action is not very reliabl...

Claims

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Application Information

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IPC IPC(8): H02P1/42H02P1/44
Inventor 蔡宗法
Owner 蔡宗法
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