CN208316602U - The dedicated double speed electronic switch of single-phase double-speed motor - Google Patents

Abstract

The utility model provides a kind of dedicated double speed electronic switch of single-phase double-speed motor, and the auxiliary winding chosen using voltage monitoring switching circuit monitoring two-speed motor is driven the movement of miniature relay, replaces common centrifugal switch.The capacitance-resistance delay releasing circuit being made of C2 and R3, it is ensured that be also unlikely to too to disconnect the opportunity of start-up capacitance in advance when the time of negligible delay, selection high speed winding when selecting low speed winding.

Description

The dedicated double speed electronic switch of single-phase double-speed motor

Technical field

The utility model relates to a kind of dedicated double speed electronic switches of single-phase double-speed motor.

Background technique

The rotating excitation field of the confidential formation stator of single-phase electric, requires the auxiliary winding of a series capacitance, electronic to guarantee Process of the machine from stationary state to normal operation provides enough torques, makes motor in start-up course usually using centrifugal switch The start-up capacitance for accessing large capacity, centrifugal switch acts after reaching certain revolving speed, throws start-up capacitance away and only maintains by running capacitor Operating.Our patent (the energy-efficient monopole asynchronous motor of electrification sub switch, application number: 201420276942.8) technology In, a kind of electronic switch low in cost, anti-conveyance capacity is strong is provided, traditional centrifugal switch can be replaced, but can not root It needs to be acted in different moments according to two kinds of different rotating speeds.

Summary of the invention

The purpose of this utility model is for the mating dedicated double speed electronic switch of single-phase double-speed motor.

It realizes the technical measures of the utility model, the auxiliary winding chosen exactly is monitored using voltage monitoring switching circuit, drive The movement of dynamic miniature relay, voltage monitoring switching circuit include the capacitance-resistance delay releasing circuit being made of C2 and R3.

Relay is attracted at once after motor booting connects start-up capacitance；After auxiliary winding voltage is increased to expected value, Relay release disconnects start-up capacitance, and motor enters normal operating condition.

Detailed description of the invention:

Fig. 1 is the circuit diagram of the utility model.

C1 is step-down capacitor in figure;C2 is delay capacitor；R1~R4 is resistance；ZQ is rectifier bridge；D1 is diode； DW For voltage-stabiliser tube；LK is the relay for substituting centrifugal switch；QC is start-up capacitance；YC is running capacitor；FL is motor auxiliary winding Contact.

Specific embodiment: the embodiment of utility model is further described below in conjunction with attached drawing.

As shown in Figure 1, the voltage on auxiliary winding FL chosen passes through step-down capacitor C1, resistance after connecting motor power The low-tension supply of R1 and rectifier bridge ZQ composition, which directly drives, replaces the relay LK of centrifugal switch to act, and motor auxiliary winding is connected The starting-up later time that start-up capacitance QC is constituted；The voltage of FL is increased to the partial pressure of voltage-stabiliser tube DW Yu resistance R2 after reaching desired speed When being worth enough transistor turns, resistance R3 bypass relay LK coil current is driven to be allowed to discharge, it is complete that contact disconnects QC access At start-up course.

On the opportunity that reasonably select electronic switch to act, the cooperation of component values is needed, so that monitoring voltage is in low speed When can act, high speed when delay time it is minimum.

Because of the effect of delay capacitor C2, when resistance R3 by-pass current to the maintenance voltage for being lower than LK coil needs one section Between, that is the capacitance-resistance delay releasing circuit being made of C2 and R3, it is ensured that when selecting low speed winding negligible delay when Between, selection high speed winding when be also unlikely to too to disconnect the opportunity of start-up capacitance in advance.

Claims (1)

1. a kind of dedicated double speed electronic switch of single-phase double-speed motor, it is characterised in that: supervised using voltage monitoring switching circuit The auxiliary winding chosen is surveyed, the movement of miniature relay is driven, voltage monitoring switching circuit includes to be prolonged by the capacitance-resistance that C2 and R3 are formed When release circuit.