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Positive and reverse rotation control circuit

A control circuit, forward and reverse technology, applied in the direction of motor generator/starter, starter of a single single-phase induction motor, etc., can solve the problem of increasing the cost of the control circuit, so as to increase risk, increase safety, and save energy. cost effect

Active Publication Date: 2009-08-05
SIEMENS SHANGHAI MEDICAL EQUIP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More contacts increase the cost of the control circuit

Method used

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  • Positive and reverse rotation control circuit
  • Positive and reverse rotation control circuit

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Embodiment Construction

[0028] figure 2 It is a circuit diagram of the forward and reverse control circuit of the present invention. figure 2 The forward and reverse control circuit in the figure 2 The control loop on the left and the figure 2 The main circuit on the right side is formed.

[0029] The function of the control loop is to control the main loop. The control loop is mainly composed of two relays K1 and K2. One end of the wire wrap of the relay K1 is connected to the collector of a triode Q1, and the other end is connected to the low-voltage power supply VCC. The base of the transistor Q1 is connected to a start signal, and its emitter is grounded to GND. Similarly, one end of the wire wrap of the relay K2 is connected to the collector of another triode Q2, and the other end is connected to the above-mentioned low-voltage power supply VCC. The base of the transistor Q2 is connected to a direction control signal, and its emitter is grounded to GND.

[0030]The function of the mai...

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PUM

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Abstract

The invention provides a circuit for controlling the positive and reverse rotation, comprising a control circuit and a main circuit; the control circuit comprises two relays (K1 and K2) and two triodes (Q1 and Q2); one end of the first relay (K1) is connected with a low-voltage power supply and the other end thereof is connected with the collector of the first triode (Q1); the base of the first triode (Q1) is connected with a starting signal and the emitter thereof is grounded; one end of the second relay (K2) is connected with the low-voltage power supply and the other end thereof is connected with the collector of the second triode (Q2); the base of the second triode (Q2) is connected with a direction control signal and the emitter thereof is grounded; the main circuit comprises a positive switch (S1) and a reverse switch (S2), a main winding of motor (L1), an auxiliary winding (L2) and a capacitor (C); the contact of the first relay (K1) is connected with an alternating current (AC) power supply (L, N); a pair of the contacts of the second relay (K2) is connected with one contact of the first relay (K1); when the contacts of the second relay (K2) are positioned at different positions, the auxiliary winding (L2) is connected in series with the capacitor (C) by the positive switch (S1) or the main winding (L1) is connected in series with the capacitor (C) by the reverse switch (S2).

Description

technical field [0001] The invention relates to a forward and reverse control circuit, in particular to a forward and reverse control circuit applied to a single-phase AC motor in medical equipment with a limit. Background technique [0002] In some medical equipment, such as the compressor of an X-ray machine, it needs to be driven by a single-phase AC motor. This single-phase AC motor needs to have forward and reverse functions, and a limit device is provided at the upper and lower limit positions reached by the transmission mechanism of the motor. [0003] Commonly used single-phase AC motor control circuits such as figure 1 shown. figure 1 The left side is a control loop and the right side is a main loop. The function of the control circuit is to control the main circuit, which is generally a low-voltage circuit; the function of the main circuit is to control the single-phase AC motor, which is generally a high-voltage circuit. usually by figure 1 The relay K1 in th...

Claims

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Application Information

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IPC IPC(8): H02P1/42H02P1/44
Inventor 郭灿赵术山田山冯银平
Owner SIEMENS SHANGHAI MEDICAL EQUIP LTD