CN201274459Y

CN201274459Y - Driving control circuit for three-phase motor

Info

Publication number: CN201274459Y
Application number: CNU200820099999XU
Authority: CN
Inventors: 张建渊; 游军
Original assignee: Chongqing Chuanyi Automation Co Ltd
Current assignee: Chongqing Chuanyi Automation Co Ltd
Priority date: 2008-09-18
Filing date: 2008-09-18
Publication date: 2009-07-15
Anticipated expiration: 2018-09-18

Abstract

The utility model relates to a drive control circuit for a three-phase motor, which comprises a three-phase power supply synchronizing pulse generation circuit, a high-frequency pulse generation circuit, a pulse transformer, a rectifier circuit, an thyristor circuit and a commutation circuit; wherein, high-frequency pulses can be coupled with the rectifier circuit by the pulse transformer, and the pulse transformer can then convert the coupled pulse signals into direct current pulse signals; the thyristor circuit can convert 380V alternating current voltage into the adjustable voltage of 0V to 380V; the commutation circuit comprises two relays comprising normally opened and normally closed contacts; wherein, the two common contacts of the relays are connected with both phases of the motor; the three-phase power supply synchronizing pulse generation circuit is connected with the high-frequency pulse generation circuit; and the pulse transformer, the rectifier circuit, thyristors and the relays are orderly connected between the high-frequency pulse generation circuit and the motor. The utility model, which adopts the relays to change phases, has the advantages of small volume, low cost and high reliability, and not only can meet the driving requirement of blowers, water pumps and the like but also can meet the requirement of electric execution mechanisms for the ordinary industrial automated control.

Description

The Drive and Control Circuit of three phase electric machine

Technical field

The utility model relates to a kind of control circuit, particularly a kind of Drive and Control Circuit of three phase electric machine.

Background technology

Threephase asynchronous is called for short three phase electric machine, usually as drive source, as is used for drive machines and equipment etc., so adopts three phase electric machine in the industrial production widely.The rotation of three phase electric machine is by a rotating magnetic field, and wherein the stator winding of three phase electric machine is used for producing rotating magnetic field.When phase power supply voltage between phase and phase differs 120 degree on phase place, also mutual deviation 120 degree on dimensional orientation of three windings in the three-phase motor stator, like this, when feeding three phase mains in stator winding, stator winding will produce a rotating magnetic field.The every variation one-period of electric current, rotating magnetic field rotates a circle in the space, i.e. and the variation of the rotary speed of rotating magnetic field and electric current is synchronous.At present, the soft drive technology of three phase electric machine generally is divided into pressure regulation driving and frequency conversion drive.Wherein: the power device that pressure regulation drives is made up of controllable silicon, and advantage with low cost is arranged.Because the controllable silicon that commutation is adopted after controllable silicon is breakdown, can make the power supply phase fault, badly damaged circuit board brings very big potential safety hazard; The power device of frequency conversion drive generally is made up of insulated gate bipolar power tube IGBT or Intelligent Power Module IPM, and energy-saving effect advantage is preferably arranged, but because peripheral additional device is more, the cost height, reliability is lower.

Summary of the invention

The purpose of this utility model has been to provide a kind of Drive and Control Circuit of three phase electric machine, adopts three phase electric machine of the present utility model, applicable to the driving of heavy-duty motor, and the commutation good reliability, volume is little, and is with low cost.

The realization the technical solution of the utility model is: comprise motor, it is characterized in that: also comprise three phase mains lock-out pulse generation circuit, high-frequency impulse generation circuit, the high-frequency impulse coupling is outputed to the pulse transformer of rectification circuit, with the shift pulse signal of coupling output is the rectification circuit of dc pulse signal, the 380v alternating current is converted to the adjustable thyristor circuit of 0～380v and often contains and open by two, the commutating circuit that the relay of normally-closed contact is formed, two common of its repeat circuit are connected with two of motor, three phase mains lock-out pulse generation circuit is connected with high-frequency impulse generation circuit, is connected with pulse transformer in turn between high-frequency impulse generation circuit and the motor, rectification circuit, thyristor and relay

The utility model adopts the silicon controlled control angle of flow, and the commutation of motor is earlier by the controllable silicon power cutoff, and by the relay commutation, controllable silicon is power-on more again, and starter motor realizes that the flexibility of motor starts.The relay real work after finishing commutation, because the contact of relay is closed, has big electric current by relay at non-loaded switching state in circuit, can bear very big rush of current.

The flexible electrical drive circuit that the utility model is made up of controllable silicon and relay and thyristor gating circuit, promptly can be used for the unidirectional runnings of motor such as water pump, blower fan, the three phase electric machine that can be used for motor bidirectional movement such as three-phase electric operator again is even controllable silicon punctures the phase fault that also can not produce power supply.

Compare with common A.C. contactor, relay is adopted in the utility model commutation, do not need peripheral additional device, make the volume of circuit dwindle greatly, cost reduces greatly, long service life, the anti-vibration performance of its mechanical endurance of 1,000 ten thousand times and 10 acceleration of gravity is that A.C. contactor is incomparable.

Description of drawings

Fig. 1 is the utility model three phase mains lock-out pulse generation circuit;

Fig. 2 is the utility model high-frequency impulse generation circuit;

Fig. 3 is the block diagram of the Drive and Control Circuit of the utility model three phase electric machine.

Embodiment

Referring to Fig. 3.The Drive and Control Circuit of three phase electric machine comprise three phase mains lock-out pulse generation circuit 2, high-frequency impulse generation circuit 1, with the high-frequency impulse coupling output to the pulse transformer 3 of rectification circuit, the shift pulse signal of exporting that will be coupled is the rectification circuit 4 of dc pulse signal, with the 380v alternating current be converted to the adjustable thyristor circuit of 0～380v 5 and by two often contain open, commutating circuit 6 that the relay of normally-closed contact is formed.Rectification circuit is made up of the circuit that 6 groups of resistance are connected in series with diode; Six thyristor Q1 of thyristor circuit become three bidirectional triode thyristors with Q2, Q3 with Q4, Q5 with the Q6 reverse parallel connection, three phase mains is connected with the silicon controlled male or female.Wherein two of two relays common contacts 1 are connected with two of motor input.3 outputs of three phase mains lock-out pulse generation circuit are connected with 3 inputs 5,13,18 of high-frequency impulse generation circuit, are used to provide and the three phase mains synchronization basic standard.12 outputs of high-frequency impulse generation circuit are connected with 12 inputs of 3 groups of coils of pulse transformer respectively, provide control wave to pulse transformer.Output 4 of 3 groups of coils of pulse transformer is connected with three-phase alternating-current supply, and two other output of 3 groups of coils of

pulse transformer

1,3 is connected with rectification circuit, pulse signal is coupled to rectification circuit, to isolate strong, weak electricity.Another output 2 of 3 groups of coils of pulse transformer is connected with 2 pin of thyristor, 3 pin of 6 thyristors in 6 outputs of rectification circuit and the thyristor circuit are connected, rectification circuit is made into dc pulse signal with six road high-frequency pulse signals, is used to trigger thyristor circuit.1,2 pin of two reverse parallel connection thyristors in the thyristor are respectively with after 2 pin of 2 groups of coils in the pulse transformer are connected, normally opened contact and normally-closed contact as relay, 1,2 pin of the 3rd reverse parallel connection thyristor in the thyristor are connected with motor M, make the 3rd reverse parallel connection thyristor in the thyristor not need to commutate and directly control motor; 2,1 other pin of 6 thyristors in the thyristor circuit is connected with power supply A, B, the C of three-phase alternating current respectively.

Referring to Fig. 1, three phase mains lock-out pulse generation circuit is made up of 3 pulse generating circuits, and the structure of three pulse generating circuits is just the same, only describes with a pulse generating circuit structure at this.With other 2 same pulse generating circuit Y-connections, be connected with three-phase alternating-current supply A by current-limiting resistance R3 after the positive pole 1 pin parallel connection of negative pole 2 pin of diode D3 and photoelectrical coupler after positive pole 1 pin of the diode D3 of pulse generating circuit and the 2 pin parallel connections of photoelectrical coupler negative pole; An output of photoelectrical coupler 4 pin are open collector output, another output pin 3 pin ground connection of photoelectrical coupler.

Referring to Fig. 2, high-frequency impulse generation circuit is made up of 3 high-frequency impulse circuit, and the structure of three high-frequency impulse circuit is just the same, only describes with a high-frequency impulse circuit structure at this.Described high-frequency electrical pulses routing resistance, triode, diode and transformer are formed, and an end of resistance R 2 is connected with power supply, and the other end is connected in series back ground connection with resistance R 3; The base stage of triode Q7 is connected with an end of resistance R 1, and the other end of R1 connects any one among three road control wave PA, PB, the PC; The negative pole of diode D1 is connected with triode Q7 base stage with an end of resistance R 1, and the positive pole of diode D1 is connected in series back ground connection with triode T1 emitter; The collector electrode of triode Q7 is connected with the base stage of triode Q8, the grounded emitter of triode Q8, and the collector electrode of triode Q8 is connected with transformer T1 with the positive pole serial connection back of diode D2, and the output of transformer connects pulse transformer; Be parallel with resistance R 4 and voltage stabilizing didoe D3 between the negative pole of diode D2 and the transformer.

Three tunnel control single pulse signals are modulated into the high-frequency pulse signal of 10kHz by high-frequency impulse generation circuit, isolate by pulse transformer again and be output into six road pulse signals, by rectifier diode six road high-frequency pulse signals are made into dc pulse signal, this signal is applied between the gate pole of thyristor (SCR) and the negative electrode and triggers SCR.By adjusting the phase place of control wave and three phase mains lock-out pulse, can realize the control of the SCR angle of flow.The triggered time of control wave is near more from lock-out pulse, and the angle of flow of SCR is big more, and the output voltage of SCR is also high more; Otherwise the triggered time of synchronization pulse is far away more from lock-out pulse, and the angle of flow of SCR is more little, and the output voltage of SCR is also high more, has realized voltage regulation of electric power sources.Voltage regulation function has been arranged, the AC power of 380v has been boosted to rated voltage by 0v in the regular hour, outputed to motor, realized flexible starting.

The normally opened contact of a relay and the normally-closed contact 6 of another relay are connected, connect the two-way output of SCR, the common by relay outputs to motor then, and other one road SCR output directly connects motor.The control end of two throw over relays is connected in parallel, and by a control signal control, realizes the synchronization action of contact.When a relay lost efficacy, motor power can not cause power supply short circuit with phase shortage.

During commutation, controllable silicon turn-offs three phase mains earlier, receive control signal by relay, two relays move simultaneously, switched to normally opened contact or switched to normally-closed contact by normally opened contact by normally-closed contact, the pin exchange of two outputs of SCR makes the power supply commutation, realize the pressure regulation starting by SCR, motor is to flexible starting in the other direction.

Claims

1. the Drive and Control Circuit of a three phase electric machine, comprise motor, it is characterized in that: also comprise three phase mains lock-out pulse generation circuit, high-frequency impulse generation circuit, the high-frequency impulse coupling is outputed to the pulse transformer of rectification circuit, with the shift pulse signal of coupling output is the rectification circuit of dc pulse signal, the 380v alternating current is converted to the adjustable thyristor circuit of 0～380v and often contains and open by two, the commutating circuit that the relay of normally-closed contact is formed, two common of its repeat circuit are connected with two of motor, three phase mains lock-out pulse generation circuit is connected with high-frequency impulse generation circuit, is connected with pulse transformer in turn between high-frequency impulse generation circuit and the motor, rectification circuit, thyristor and relay.

2. the Drive and Control Circuit of three phase electric machine according to claim 1, it is characterized in that: three phase mains lock-out pulse generation circuit is made up of 3 pulse generating circuits, with other 2 same pulse generating circuit Y-connections, the back anodal in parallel of the negative pole of diode and photoelectrical coupler is connected with three-phase alternating-current supply by current-limiting resistance after the positive pole of the diode of pulse generating circuit and the parallel connection of photoelectrical coupler negative pole; One of photoelectrical coupler is output as open collector output, another output pin ground connection of photoelectrical coupler.

3. the Drive and Control Circuit of three phase electric machine according to claim 1 is characterized in that: described high-frequency electrical pulses routing resistance, triode, diode and transformer are formed, and an end of resistance R 2 is connected with power supply, and the other end is connected in series ground connection afterwards with resistance R 3; The base stage of triode Q7 is connected with an end of resistance R 1, and the other end of R1 connects control wave; The negative pole of diode D1 is connected with triode Q7 base stage with an end of resistance R 1, and the positive pole of diode D1 is connected in series back ground connection with triode T1 emitter; The collector electrode of triode Q7 is connected with the base stage of triode Q8, the grounded emitter of triode Q8, and the collector electrode of triode Q8 is connected with transformer T1 with the positive pole serial connection back of diode D2, and the output of transformer connects pulse transformer; Be parallel with resistance R 4 and voltage stabilizing didoe D3 between the negative pole of diode D2 and the transformer.

4. the Drive and Control Circuit of three phase electric machine according to claim 1, it is characterized in that: described rectification circuit is made up of the circuit that 6 groups of resistance are connected in series with diode; Six thyristor reverse parallel connections of thyristor circuit become three bidirectional triode thyristors, and three phase mains is connected with the silicon controlled male or female.