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Protective circuit used in starting and operating processes of single-phase asynchronous motor

An operation process, single-phase asynchronous technology, applied in the direction of emergency protection circuit devices, emergency protection circuit devices, circuit devices, etc. for limiting overcurrent/overvoltage, can solve problems such as large current and motor failure to start, and achieve contact The effect of small resistance, simple circuit and reliable shunt

Inactive Publication Date: 2017-05-17
丛伟滋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The overcurrent protector is mainly used for the overcurrent protection of the motor load state. The current value of the protector is based on the rated current of the motor. However, when the motor drives the load to start, the current is large, and the overcurrent protector operates to disconnect the power supply. , the motor cannot be started, it is urgent to improve

Method used

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  • Protective circuit used in starting and operating processes of single-phase asynchronous motor
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  • Protective circuit used in starting and operating processes of single-phase asynchronous motor

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 2 As shown, the current relay K1, the main winding L1, the overcurrent protector M, and the power supply V are connected in series in sequence; the loop composed of the running capacitor C1, the starting capacitor C2, and the centrifugal switch S1 is connected in parallel with the secondary winding L2 after being connected in series. On L1; the contacts of the current relay K1 are connected with the contacts of the overcurrent protector M.

[0022] The current relay contact is in the normally open state when the power switch is turned off; when the power is turned on and a large current is applied, the magnetic field generated attracts the moving contact and the fixed contact to close and is connected in parallel with the overcurrent protector contact to prevent overcurrent The protector acts as a shunt to ensure that the overcurrent protector passes a small amount of current during the starting process of the motor without power failure; after starting,...

Embodiment 2

[0024] Such as image 3 As shown, the main winding L1, the overcurrent protector M, and the power supply V are connected in series in sequence; the circuit composed of the running capacitor C1, the starting capacitor C2, and the centrifugal switch S1 is connected in parallel with the secondary winding L2 after being connected in series with the main winding L1; bistable The contacts of the relay K2 are connected to the contacts of the overcurrent protector M, the combination of the bistable relay K2 and the electronic controller N is connected in parallel at both ends of the dual-state centrifugal switch S2, and the input terminal of the electronic controller N is connected to on the output of the two-state switch S2.

[0025] The polarity of the permanent magnetic field installed at one end of the movable contact in the bistable relay and the positive and negative polarities connected to the two lead-out wires of the trigger coil determine that the two contacts are closed und...

Embodiment 3

[0027] Such as Figure 4 As shown, the main winding L1, the overcurrent protector M, and the power supply V are connected in series in sequence; the circuit composed of the operating capacitor C1, the starting capacitor C2, and the centrifugal switch S1 is connected in parallel with the secondary winding L2 after being connected in series. On L1; the contacts of the solid state relay K3 are connected to the contacts of the overcurrent protector M; the solid state relay K3 is connected in parallel at both ends of the centrifugal switch S1.

[0028] Use the opening and closing state of the centrifugal switch contact as the trigger signal of the SCR in the solid state relay to control the conduction and cut-off of the SCR in the solid state relay K3. When the motor is in the starting state, the SCR is turned on, and the two ends of the SCR It is connected in parallel with the overcurrent protector to act as a shunt; the motor is started, the centrifugal switch is disconnected, th...

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Abstract

The invention discloses a protective circuit used in starting and operating processes of a single-phase asynchronous motor. The protective circuit comprises an overcurrent protector M, a relay module K, a main winding L1, a secondary winding L2, a centrifugal switch S1, an operating capacitor C1 and a starting capacitor C2, wherein the relay module K, the main winding L1, the overcurrent protector M and a power supply V are connected in sequence; a loop which consists of the operating capacitor C1, the starting capacitor C2 and the centrifugal switch S1 is connected with the secondary winding L2 in series, and then connected with the main winding L1 in parallel; and the contact of the relay module K is connected with the contact of the overcurrent protector M. The protective circuit is simple in circuit, and scientific and reasonable; and various kinds of high-power contacts connected with the overcurrent protector in parallel can bear high current, the contact resistance in the starting process is low, reliable shunting is realized, and synchronization between signal access points and starting and operating states of the motor can be controlled.

Description

technical field [0001] The invention relates to an overcurrent protection circuit, in particular to a protection circuit used in the starting and running process of a single-phase asynchronous motor. Background technique [0002] The overcurrent protector is mainly used for the overcurrent protection of the motor load state. The current value of the protector is based on the rated current of the motor. However, when the motor drives the load to start, the current is large, and the overcurrent protector operates to disconnect the power supply. , the motor cannot be started, and it is urgently needed to be improved. Contents of the invention [0003] In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a protection circuit used in the starting and running process of a single-phase asynchronous motor. The circuit has a simple structure and is scientific and reasonable. [0004] In order to achieve the above purpose, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 丛伟滋
Owner 丛伟滋
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