CN207339691U - A kind of single-phase motor suitable for frequent starting - Google Patents

Abstract

It the utility model is related to a kind of single-phase motor suitable for frequent starting, on the one hand the starting current of motor is reduced using the method for reducing end ring thickness, on the other hand two electrolysis special for doubling capacity capacitance series connection are integrated the original start-up capacitance of substitution, a discharge resistance in parallel on the capacitance of each series connection, discharge after start-up course is terminated to capacitance rapidly, protect the contact of start-up capacitance and centrifugal switch, two groups of capacitances for being serially connected in auxiliary winding one end and centrifugal switch can also be transferred to the centre position of auxiliary winding together, avoid the generation of motor electric shock accidents in the case of imperfect earth.

Description

A kind of single-phase motor suitable for frequent starting

Technical field

It the utility model is related to a kind of single-phase motor suitable for frequent starting.

Background technology

Modern general induction alternating current (AC) motor has single-phase and three-phase point, but in the family for not possessing three phase supply condition Or remote countryside can only use single-phase motor.

Phase separation solution single-phase alternating current is split in single-phase motor usually utilization can not directly form induction conductivity needs The problem of rotating excitation field, split the capacitance that phase separation forms rotating excitation field needs very large capacity；After startup, motor can be because of inertia Effect, which is formed, continues rotating power, as long as the resistance that the power of motor exceedes machinery can just run well always, then just has Using the capacitance of series connection centrifugal switch complete " the YC motors " of start-up course and start, the double capacitances of operating and deposit " YL is electric Machine ".

Common double capacitance single-phase motors are after running capacitor and string are had the start-up capacitance parallel connection of centrifugal switch, then to go here and there It is linked in auxiliary winding circuit.Two capacitance parallel runnings in start-up course, after reaching desired speed, centrifugal switch action disconnects The connection of start-up capacitance, motor enter normal operating conditions.The start-up capacitance of motor only just accesses circuit in start-up course, Electrolysis special capacitance that operating voltage is 250V is typically chosen with regard to that can meet the needs of normal start-up capacitance, but in such as tapping Machine, mixer etc. need the mechanically operation of frequent starting, the failure that often just start-up capacitance is burnt caused by overheat.

The content of the invention

The purpose of this utility model, being to provide a kind of be suitably applied needs the single-phase motor of frequent starting mechanically.

The technical measures of the utility model, have on the one hand been declared using us《Reduce end ring thickness and improve startability Asynchronous motor》Patented technology (the patent No.：201621195218.8), reduce the starting current of motor, on the other hand carry The pressure voltage of high electrolysis special capacitance, specific way are that two electrolysis special for doubling capacity capacitance series connection are integrated, and are taken For original start-up capacitance.

A discharge resistance in parallel on the electrolysis special capacitance of each series connection, can be fast after motor terminates start-up course Speed gives capacitance electric discharge, can also protect the contact of centrifugal switch except it preferably can protect start-up capacitance in addition to, reduction hard arc to from The damage of heart switch contact.

Beneficial effect：

The utility model is not only able to effectively protect the start-up capacitance of motor in the start-up course of monophase machine, reduces Damage of the hard arc that start-up capacitance is formed to centrifugal switch contact；Those, which can also be substituted, needs frequent starting, is typically only capable to Using the threephase motor of three phase mains, avoid setting up the trouble of three-phase power line.

Brief description of the drawings：

Fig. 1 is the circuit diagram of common " YC " single-phase motor.

Fig. 2 is the single-phase motor of common double capacitances（YL）Circuit diagram.

Fig. 3 is single-phase electromotor circuit schematic diagram of two electrolytic capacitors as start-up capacitance of connecting.

Fig. 4 is the single-phase electromotor circuit schematic diagram among start-up circuit access auxiliary winding.

Each map logo is unitedly described as follows：

LZ is main winding；LF or LF1, LF2 are auxiliary winding；YC is running capacitor；QC and QC1, QC2 are electrolysis special Capacitance；R1, R2 are discharge resistance；K is centrifugal switch.

Embodiment：

Two specific embodiments are introduced below in conjunction with attached drawing：

Embodiment one：Single-phase motor of two electrolytic capacitors of series connection as start-up capacitance.

Connected in the circuit of Fig. 3 using the electrolysis special capacitance for doubling capacity and be used as start-up capacitance, and use discharge resistance Capacitance electric discharges of the R1 and R2 to series connection, terminates start-up course into start-up capacitance of giving out light rapidly after normal operating conditions in motor The voltage of storage, had not only avoided the danger of electric shock, but also during motor failure being eliminated, produced by start-up capacitance reservoir voltage Damage of the hard arc to centrifugal switch contact.

Embodiment two：The single-phase motor among capacitor combination circuit access auxiliary winding.

The circuit of Fig. 4 is in parallel by running capacitor and start-up capacitance with centrifugal switch in addition to having the advantages that Fig. 3 circuits Combinational circuit, which is connected to, is decomposed into two-part auxiliary winding centre position, greatly reduces the induced voltage at capacitance both ends, The generation of the electric shock accidents in the case of no ground or imperfect earth is avoided, improves the security of user.We take a sample test The single-phase motor of 100 same models, detects casing voltage-to-ground, Fig. 3 connections reach 120V, and scheme respectively by different connections 4 connections only have 70V, the obvious injury that can preferably avoid to human body.

Claims (1)

1. A kind of 1. single-phase motor suitable for frequent starting, it is characterised in that：Reduce end ring thickness to reduce the startup of motor Electric current;Two electrolysis special capacitances for doubling capacity and parallel discharge resistance connect as start-up capacitance;By running capacitor and band The start-up capacitance parallel combination circuit of centrifugal switch, is connected to and is decomposed among two-part auxiliary winding.