CN2236187Y

CN2236187Y - Electric motor protector

Info

Publication number: CN2236187Y
Application number: CN 95234028
Authority: CN
Inventors: 卫晓天
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-06-01
Filing date: 1995-06-01
Publication date: 1996-09-25
Anticipated expiration: 2005-06-01

Abstract

The utility model provides an electric motor protector, comprising a state indicating circuit, a temperature sample circuit, an alternating current contactor on a motor control circuit. The temperature sample circuit comprises a plurality of temperature sensors and is connected in series with the coil curl of the alternating current contactor to control the switching of the main circuit of an electric motor. The state indicating circuit indicates the operating state of the electric motor. The temperature signals of the utility model are from the electric motor protector, and the back feed of the temperature signals is timely, accurate, and reliable. The utility model has the advantages of simple and rational structure, extensive protection range, low cost, and convenient installation and operation; the electric motor protector has the protect functions of phase interruption, over pressure, over load, etc.; the electric motor protector is suitable for the electric motors of various specifications.

Description

A kind of motor protector

The utility model relates to a kind of motor protecting circuit device, specifically a kind of motor protector.

We know, alternating current motor can be burnt during operation under overload, short circuit, overvoltage or state such as under-voltage.At present; motor protector miscellaneous is arranged; generally be by power supply; the abnormal signal sample circuit; compositions such as execution and control circuit; a kind of multi-functional electric motor protecting device is disclosed as patent CN2116296U; this protector is by the open-phase protection circuit that is located in the housing; under-voltage protecting circuit; overvoltage crowbar; the rectifying and voltage-stabilizing filter circuit; gate circuit; temperature-control circuit; starting delay circuit; formations such as output circuit; it is applicable to the overvoltage of motor and various electrical equipment; under-voltage; the phase failure; the overheated protector that waits protection, but above prior art complex structure, volume is big; and in motor moment overload; overcurrent, voltage instantaneous is too high to be easy to generate misoperation, opens frequent; and start again after shutting down; owing to exist time-delay, can not carry out work at once, very unfavorable to producing.

The purpose of this utility model is exactly in order to overcome the deficiencies in the prior art, provide a kind of simple and reasonable, volume is little, guard signal is self-supporting, automatic display working condition, protection range is wide, adaptability is strong, the motor protector of dependable performance.

For achieving the above object; a kind of motor protector; it is by condition indication circuit; A.C. contactor three parts on temperature sampling circuit and the circuit for controlling motor are formed; it is characterized in that temperature sampling circuit is made up of several normally closed type temperature sensors; they are connected mutually; be placed in respectively in the motor winding; and be connected in series with the A.C. contactor sucking coil; controlling the break-make of motor main line by A.C. contactor; condition indication circuit is provided with green LED D1 and red light emitting diodes D2; wherein green LED D1 and temperature sampling circuit are in series; red light emitting diodes D2 and temperature sampling circuit are in parallel, with indication motor work and protection; the operating state of control circuit.

Red light emitting diodes D2 in the utility model condition indication circuit connects with two withstand voltage diodes and resistance R, is connected between power line a, the b; Green LED D1 connects with a withstand voltage diode, and their terminate between red light emitting diodes D2 and the resistance R, and the other end is connected with temperature sampling circuit.

The utility model is simple and reasonable, and protection range is wide, can be applied on the motor of all size; be not subjected to the restriction of motor power (output); can replace multiple motor protector, have protective effects such as the phase failure, superpressure, under-voltage, overload, disconnect whole load to control little electric current; but and indicating operating status; in time operation is avoided delaying work, and volume is little, cost is low; safe and reliable, easy to use.

Below in conjunction with accompanying drawing the utility model is described further.

Fig. 1 is a structural representation of the present utility model, also is the schematic diagram of embodiment.

As can be seen from Figure 1; a kind of motor protector is made up of A.C. contactor CJ three parts on condition indication circuit, temperature sampling circuit and the circuit for controlling motor; temperature sampling circuit is made up of some normally closed type temperature sensor K, and they are placed in respectively on the protected motor coil.The cranking temperature of temperature sensor can be determined according to the insulation level of protected motor, supposes that the insulation temperature is 100 ℃, and before the motor coil temperature reached this value, the temperature sensor normally-closed contact disconnected; When coil temperature is returned to the motor normal working temperature, it just resets, or is normally closed.The number of temperature sensor and the placement of position are fixing can be determined according to power of motor, in general can be with 1 to each phase coil of three phase electric machine, and also available certainly 2,3; but no matter several; all adopt the series connection form, the transducer of placing in the motor the more, the protected motor safety that heals.The utility model is placed in transducer in the motor winding and the sucking coil of A.C. contactor CJ is connected in series, and is being controlled the break-make of motor main line by A.C. contactor.Condition indication circuit is provided with elements such as withstand voltage diode D3, D4, D5, resistance R, green LED D1, red light emitting diodes D2, red light emitting diodes D2 connects with two withstand voltage diode D4, D5 and resistance R, be connected between power line a, the b, green LED D1 connects with a withstand voltage diode D3, one terminates between red light emitting diodes D2 and the resistance R, other end jointing temp sample circuit.The other end of temperature sampling circuit joins with lead-in wire m again, red light emitting diodes D2 just forms in parallel with temperature sampling circuit like this, green LED D1 and temperature sampling circuit form and connects, and form in parallelly with A.C. contactor, and going between directly connects 220V or 380V voltage between a, the b.During use, the each several part operate as normal, green luminotron D1 lights, and the green light on the signal indicator is bright at this moment; When motor breaks down, when coil temperature exceeds normal working temperature, the temperature sensor contact disconnects, the motor main line is promptly cut off by A.C. contactor, motor just quits work, and this moment, green luminotron D1 extinguished, and red luminotron D2 lights, red light on the positioning indicator is just bright, with let others have a look at machine operation unusual.When coil temperature was returned to the motor normal working temperature, temperature sensor can reset, and kept normally off, green light in the condition indication circuit is bright, indicate this moment motor and can restart work, the operator in time presses the starting button of A.C. contactor, but just operate as normal of motor.The utility model indicating circuit can indicate The whole control before the each startup of motor, whether protective circuit is normal, so that the operator can accurately judge the various states of machine operation, avoids misoperation, do not delay work, and improved labor productivity.

The utility model cost is low, and reliable effect is applied widely, and is easy to install.

Claims

1; a kind of motor protector; it is by condition indication circuit; A.C. contactor three parts on temperature sampling circuit and the circuit for controlling motor are formed; it is characterized in that temperature sampling circuit is made up of several normally closed type temperature sensors; they are connected mutually; be placed in respectively in the motor winding; and be connected in series with the A.C. contactor sucking coil; controlling the break-make of motor main line by A.C. contactor; condition indication circuit is provided with green LED D1 and red light emitting diodes D2; wherein green LED D1 and temperature sampling circuit are in series; red light emitting diodes D2 and temperature sampling circuit are in parallel, with indication motor work and control; the operating state of protective circuit.

2, motor protector according to claim 1; it is characterized in that the red light emitting diodes D2 in the said condition indication circuit connects with two withstand voltage diodes and resistance R; be connected between power line a, the b; green LED D1 connects with a withstand voltage diode; one terminates between red light emitting diodes D2 and the resistance R, and the other end is connected with temperature sampling circuit.