CN2472413Y

CN2472413Y - Speed regulator for permanent magnet DC motor

Info

Publication number: CN2472413Y
Application number: CN 01209069
Authority: CN
Inventors: 吴燮华
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2001-03-13
Filing date: 2001-03-13
Publication date: 2002-01-16
Anticipated expiration: 2011-03-13

Abstract

The utility model relates to a speed regulator for a permanent magnetism DC motor, which comprises a PIC16C74 SCM (single chip microcomputer), a main voltage sampling circuit, a speed setting circuit, a motor current sampling circuit, a motor current direction detecting circuit, a motor current overflow detecting circuit, a PWM blocking circuit and a driving circuit. After the input signals of the main voltage sampling circuit, the speed setting circuit and the motor current sampling circuit are calculated by the SCM, pulse width modulating signals which are generated are used for regulation speed for a motor through the PWM blocking circuit and the driving circuit. The utility model can make the motor satisfy the optimized speed regulating requests in different operation stages of starting up, speed regulation, brake, etc. The utility model has the advantages of good dynamic performance of speed regulation, safe and reliable operation, simple structure, small size and low cost.

Description

The permanent magnet DC motor speed regulating device

The utility model relates to a kind of permanent magnet DC motor speed regulating device.

The control of simulation proportional and integral controller is all adopted in the speed regulation of permanent magnet DC motor at present, after must testing the speed with tachogenerator, compares with given speed, produces pwm pulse, power supply machine speed governing through simulation proportional and integral controller and pulse-width modulation generation circuit.Tachogenerator cost height, volume is big, and simulation proportional and integral controller circuit needs a large amount of discrete components, its circuit complexity, the fault detect of system and maintenance difficult.The temperature problem of floating aging and that can not compensate of analog component can influence the long-time stability of control system, and the error of components and parts also can directly influence the performance of control system.Because the component parameters of simulation proportional and integral controller circuit can not change, to realize that therefore it is impossible that speed governing that motor all satisfies the best in different operation phase such as starting, speed governing, brakings requires in running.In the occasion of two motor linkages of needs, need two cover simulation proportional and integral controller circuit, because the dispersiveness of resistance, capacitance parameter, it also is very difficult making the dynamic property of two electric machine speed regulations in full accord.

The purpose of this utility model provide a kind of simple in structure, volume is little, cost is low, safe and reliable to operation, the permanent magnet DC motor speed regulating device that speed adjusting performance is good.

Permanent magnet DC motor speed regulating device of the present utility model comprise the PIC16C74 single-chip microcomputer, the supply voltage sample circuit, speed given circuit, the current of electric sample circuit, current of electric direction testing circuit, the current of electric over-current detection circuit, PWM lockout circuit and drive circuit, the supply voltage sample circuit converts DC power supply on the AN4 pin of 0～5 volt voltage input single-chip microcomputer, the current of electric sample circuit converts current of electric on the AN1 pin of voltage input single-chip microcomputer, the output of speed given circuit links to each other with the AN0 pin of single-chip microcomputer, single-chip microcomputer is to AN0, AN1, after the input signal of AN4 pin carries out computing, the pulse-width signal that produces is through PWM lockout circuit input driving circuit, the output of current of electric direction testing circuit links to each other with the RD2 pin of single-chip microcomputer, the output of current of electric over-current detection circuit divides two the tunnel, the one road connects the INT pin of single-chip microcomputer, another road input PWM lockout circuit.During work, by single-chip microcomputer input signal is carried out the pulse-width signal power supply machine governing speed that produces after the computing.When current of electric is excessive, the current of electric over-current detection circuit will send interrupt signal, stop the motor operation.

Permanent magnet DC motor speed regulating device of the present utility model are owing to be to regulate motor speed with the pulse-width signal that the single-chip microcomputer computing obtains, so its speed governing dynamic property is good, the defective that does not exist discrete component to cause, can make motor all satisfy best speed governing requirement in different operation phase such as starting, speed governing, brakings, safe and reliable to operation, also be convenient to realize making the dynamic property of two electric machine speed regulations consistent.These speed regulating device are simple in structure, and volume is little, and cost is low.

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

Fig. 1 is a forming circuit block diagram of the present utility model;

Fig. 2 is a physical circuit example of the present utility model.

With reference to Fig. 1, permanent magnet DC motor speed regulating device of the present utility model comprise the PIC16C74 single-chip microcomputer, supply voltage sample circuit 3, speed given circuit 4, current of electric sample circuit 5, current of electric direction testing circuit 6, current of electric over-current detection circuit 7, PWM lockout circuit 8 and drive circuit 2, supply voltage sample circuit 3 converts DC power supply on the AN4 pin of 0～5 volt voltage input single-chip microcomputer, current of electric sample circuit 5 converts current of electric on the AN1 pin of voltage input single-chip microcomputer, the output of speed given circuit 4 links to each other with the AN0 pin of single-chip microcomputer, single-chip microcomputer is with AN0, AN1, the signal of AN4 pin input is through mould/number conversion, go forward side by side and produce pulse-width signal after the row operation, this signal is turned round through main power circuit 1 drive motors 10 by the output of drive circuit through PWM lockout circuit 8 input driving circuits 2.The output that is used to detect the testing circuit 6 of current of electric both forward and reverse directions links to each other with the RD2 pin of single-chip microcomputer, the output of circuital current over-current detection circuit 7 divides two the tunnel, the one road connects the INT pin of single-chip microcomputer, another road input PWM lockout circuit 8, when current of electric is excessive, this over-current detection circuit will send interrupt signal in single-chip microcomputer and PWM lockout circuit, make motor out of service.

In instantiation shown in Figure 2, given circuit 4 adopts potentiometer W1, supply voltage sample circuit 3 is made of divider resistance R5, R6, current of electric sample circuit 5 has two current transformer I1, I2, the former edge joint master power circuit of two current transformers, two current signals paying the limit are synthetic through rectifying and wave-filtering, are reduced volume, reduce cost, current transformer I1, I2 can form with the bead coiling.Current of electric direction testing circuit 6 is made of comparator A1, and comparator A1 output connects the RD2 pin of single-chip microcomputer, and the high or low level of comparator output is represented the both forward and reverse directions of current of electric.PWM lockout circuit 8 is adopted and door U2A, links to each other with CCP1 pin, the RC7 pin of single-chip microcomputer respectively with 13 pin, 2 pin of door U2A, and output 12 pin connect drive circuit 2.Current of electric over-current detection circuit 7 is made of comparator A2, the output of comparator A2 reaches with the INT pin of single-chip microcomputer and links to each other with 1 pin of door U2A, when the generation current of electric is excessive, the output of comparator A2 becomes low level from high level, single-chip microcomputer is produced to interrupt, directly feed signals is blocked pulse-width signal output in the PWM lockout circuit simultaneously.The all available integrated package LM339 of above-mentioned comparator A1, A2.

Usually, can insert the audible and visual alarm circuit at other I/O mouth of single-chip microcomputer, as this example, on single-chip microcomputer, insert the audible and visual alarm circuit 9 that constitutes by triode T1, resistance, light-emitting diode, when taking place, DC power supply under-voltage or motor-driven loose contact can in time report to the police like this.

Because speed regulating device of the present utility model are to realize speed governing with the pulse-width signal that the single-chip microcomputer computing obtains, therefore at same single-chip microcomputer, increase the given and current sampling circuit of access speed, just can realize two motor linkage speed governing, and can make the speed governing dynamic property of two motors consistent.

Claims

1. permanent magnet DC motor speed regulating device, it is characterized in that it comprises the PIC16C74 single-chip microcomputer, supply voltage sample circuit [3], speed given circuit [4], current of electric sample circuit [5], current of electric direction testing circuit [6], current of electric over-current detection circuit [7], PWM lockout circuit [8] and drive circuit [2], supply voltage sample circuit [3] converts DC power supply on the AN4 pin of 0～5 volt voltage input single-chip microcomputer, current of electric sample circuit [5] converts current of electric on the AN1 pin of voltage input single-chip microcomputer, the output of speed given circuit [4] links to each other with the AN0 pin of single-chip microcomputer, single-chip microcomputer is to AN0, AN1, after the input signal of AN4 pin carries out computing, the pulse-width signal that produces is through PWM lockout circuit [8] input driving circuit [2], the output of current of electric direction testing circuit [6] links to each other with the RD2 pin of single-chip microcomputer, the output of current of electric over-current detection circuit [7] divides two the tunnel, the one road connects the INT pin of single-chip microcomputer, another road input PWM lockout circuit [8].

2. by the described permanent magnet DC motor speed regulating device of claim 1, it is characterized in that said current of electric sample circuit [5] has two current transformers [I1], [I2], the former edge joint master power circuit of two current transformers, two current signals paying the limit are synthetic through rectifying and wave-filtering.

3. by the described permanent magnet DC motor speed regulating device of claim 2, it is characterized in that said current transformer [I1], [I2] form with the bead coiling.