CN2263838Y

CN2263838Y - Intelligent electric motor protector

Info

Publication number: CN2263838Y
Application number: CN 96225780
Authority: CN
Inventors: 王颂; 曹大久; 刘承俊; 毕敬
Original assignee: Institute of Metal Research of CAS
Current assignee: Institute of Metal Research of CAS
Priority date: 1996-04-04
Filing date: 1996-04-04
Publication date: 1997-10-01
Anticipated expiration: 2006-04-04

Abstract

The utility model belongs to a motor protector whose structure is composed of the three phase power supply of a rectification circuit output by a transformer, a dial switch circuit, an A/D changeover circuit, a single-chip microcomputer and a driving circuit. Rated value is preset on the dial switch. The three phase power supply signal of the rectification circuit can be converted into a DC, the signal can be simultaneously sent to an A/D changeover device, and then the signal can be input into the single-chip computer. An input signal can be output by the single-chip computer via a drive control magnetic starter in order to realize the protection to a motor. The utility model has the advantages of simple structure, large operating range and high sensitivity. The utility model can arbitrarily regulate work range and timing.

Description

The intelligent electric motor protector

The utility model belongs to a kind of motor protecter.

At present; motor is indispensable power-equipment in rural area, factory or large enterprise; because the requirement of producing; power of motor is very big; for the damage that prevents motor is added with motor protecter usually; motor protecter in the past mainly is to adopt the separation member electronic circuit; the motor device overload; overvoltage or overcurrent; make magnetic starter work by transistor and controllable silicon, effectively controlled the normal operation of motor, its deficiency is a job insecurity; narrow application range line construction complexity is installed and used inconvenience.

For solving the deficiency of above motor protecter circuit structure; the purpose of this utility model provides a kind of intelligent electric motor protector, utilizes microprocessor chip to make the no part of control, utilizes digital quantity to transform; to realize control flexibly, purpose easy for operation, that working range is wide.

Its circuit structure of the utility model intelligent protector for motor is illustrated in conjunction with the embodiments

Fig. 1 is the intelligent protector for motor shape assumption diagram;

Fig. 2 is the intelligent protector for motor electrical schematic diagram.

Circuit structure as shown in Figure 2, this circuit is by the three-phase alternating-current supply rectification circuit, the toggle switch circuit, the A/D change-over circuit, single-chip microcomputer and drive circuit are formed, its connection is that the ABC three-phase of three-phase alternating-current supply behind D.C mutual-inductor joins with electric pressure converter (AD536) input respectively, and its output connects the input of A/D converter (ADC0809) respectively; Toggle switch circuit and memory able to programme (20V8) input join; the memory output joins with the A/D converter input respectively; memory able to programme (20V8) output joins with singlechip chip (AT89C2501) input simultaneously; the output of A/D converter and single-chip microcomputer (AT89C2501) change end over to and join; at last; singlechip chip output directly connects the starter of controlling power supply by triode driver; the operation of start-up control motor, the A/D converter input has connected clock control circuit, and its protector contour structures is as shown in Figure 1; on the control panel; 1 is housing, and 2 are overload, the phase failure and short circuit indicator light; 3 is toggle switch, and 4 is mains switch.

Operation principle: toggle switch is used for setting the motor load current value; assembly AD536 becomes direct current signal to the ABC three-phase ac signal of D.C mutual-inductor output and sends into A/D converter; transducer becomes digital quantity to voltage and inputs to single-chip microcomputer; assembly ZCV8 becomes the respective digital code to the rated value of setting and sends into single-chip microcomputer; the AT89C2051 single-chip microcomputer compares each phase current values of motor rated value and measurement; keep and carry; the various judgements of the phase failure and short circuit; if a certain condition has surpassed the limit; single-chip microcomputer carries out digital integration; by the driver drives magnetic switch, the protection to motor is realized in disconnected power down source.

The advantage of the utility model: circuit structure is simple, and working range is big, and is highly sensitive, Maximum characteristics can be regulated and control arbitrarily working range and setting-up time.

Claims

1. intelligent electric motor protector, it is characterized in that this protector is by the three-phase alternating-current supply rectification circuit, the toggle switch circuit, the A/D change-over circuit, single-chip microcomputer and drive circuit are formed, its connection is that the ABC three-phase of three-phase alternating-current supply behind D.C mutual-inductor joins with electric pressure converter (AD536) input respectively, and its output connects the input of A/D converter (ADC0809) respectively; Toggle switch circuit and memory able to programme (20V8) input join, the memory output joins with the A/D converter input respectively, memory able to programme (20V8) output joins with singlechip chip (AT89C2501) input simultaneously, the output of A/D converter and single-chip microcomputer (AT89C2501) change end over to and join, at last, singlechip chip output directly connects the starter of controlling power supply by triode driver, the operation of start-up control motor.

2. by the described intelligent electric motor protector of claim 1, it is characterized in that being equipped with on the controller panel overload, the phase failure and short circuit indicator light (2), toggle switch (3), mains switch (4).