CN207117514U - A kind of motor drive circuit - Google Patents

Abstract

The utility model discloses a kind of motor drive circuit, it is made up of first resistor to 3rd resistor, the first electric capacity to the 3rd electric capacity, switch, rectifier, diode, potentiometer, controllable silicon and motor, first capacitor filtering, diode rectification, through resistance current limliting, potentiometer adjusts the intensity of output current, so as to adjust the angle of flow of controllable silicon, the current strength of motor is further changed, so as to change the rotating speed of motor.Compared with prior art, the utility model controls the angle of flow of controllable silicon to change by potentiometer, utilize the voltage strength of SCR control motor, so as to serve the rotating speed of adjustment motor, because the angle of flow of potentiometer control controllable silicon is stable, so as to put forward high-revolving control accuracy, there is the value of popularization and application.

Description

A kind of motor drive circuit

Technical field

It the utility model is related to electronic technology field, more particularly to a kind of motor drive circuit.

Background technology

Motor is a kind of equipment for converting electrical current into mechanical energy.It is to use the power on coil (namely stator winding) Produce rotating excitation field and act on rotor (such as squirrel-cage closure aluminium frame) and form electro-magnetic motor force rotation torque.Motor is pressed using electricity Source difference is divided into dc motor and ac motor, and the motor in power system is largely alternating current generator, can be same Step motor either asynchronous machine (motor stator rotational speed of magnetic field does not keep synchronous speed with rotor rotary rpm).Motor mainly by Stator forms with rotor, and the direction of electrified wire movement under force in magnetic field is with the sense of current and magnetic induction line (magnetic direction) direction It is relevant.Electric motor operation principle is effect of the magnetic field to electric current stress, makes motor rotation.In the prior art, for motor Driving rotating-speed control circuit species it is various, function respectively has quality, in order to improve control rotating speed precision, it is necessary to constantly change Enter and innovate.

Utility model content

The purpose of this utility model is that to solve the above problems and provides a kind of motor drive circuit.

The utility model is achieved through the following technical solutions above-mentioned purpose：

The utility model by first resistor to 3rd resistor, the first electric capacity to the 3rd electric capacity, switch, rectifier, diode, Potentiometer, controllable silicon and motor composition, two inputs of the rectifier and the both ends of AC power connect, described to open Pass is connected on the loop of AC power, the cathode output end of rectifier simultaneously the first end with the first electric capacity, diode it is negative Pole connects with the first end of motor, and the second end with the first electric capacity, diode be just simultaneously for the cathode output end of rectifier Pole, the first end of the second electric capacity, the first end of 3rd resistor, the first end of the 3rd electric capacity connect with the negative pole of controllable silicon, and second Second end of electric capacity be connected with the sliding end of potentiometer and the first end of second resistance simultaneously, the second end of second resistance and meanwhile with The second end, the second end of the 3rd electric capacity of 3rd resistor connect with the control terminal of controllable silicon, the first end of potentiometer and the first electricity The first end connection of resistance, the second end of first resistor are connected with the positive pole of controllable silicon and the second end of motor simultaneously.

The beneficial effects of the utility model are：

The utility model is a kind of motor drive circuit, and compared with prior art, the utility model passes through potentiometer control The angle of flow change of controllable silicon processed, using the voltage strength of SCR control motor, so as to serve adjustment motor Rotating speed, because the angle of flow of potentiometer control controllable silicon is stable, so as to put forward high-revolving control accuracy, there are popularization and application Value.

Brief description of the drawings

Fig. 1 is circuit structure schematic diagram of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with the accompanying drawings：

As shown in Figure 1：The utility model by first resistor R1 to 3rd resistor R3, the first electric capacity C1 to the 3rd electric capacity C3, It is defeated to switch S, rectifier DR, diode D, potentiometer RP, controllable silicon SCR and motor M compositions, two of the rectifier DR Enter end to be connected with AC power AC both ends, the switch S is connected on AC power AC loop, and rectifier DR positive pole is defeated Go out end to be connected with the first end of the first electric capacity C1 first end, diode D negative pole and motor M simultaneously, rectifier DR's Cathode output end simultaneously with the first electric capacity C1 the second end, diode D positive pole, the second electric capacity C2 first end, 3rd resistor R3 first end, the 3rd electric capacity C3 first end connect with the negative pole of controllable silicon SCR, the second electric capacity C2 the second end simultaneously with electricity Position device RP sliding end connect with second resistance R2 first end, second resistance R2 the second end while with the of 3rd resistor R3 Two ends, the 3rd electric capacity C3 the second end connect with the control terminal of controllable silicon SCR, and potentiometer RP first end is with first resistor R1's First end is connected, and first resistor R1 the second end is connected with the positive pole of controllable silicon SCR and motor M the second end simultaneously.

Operation principle of the present utility model is as follows：

Close a switch S, provides dc source, the first electric capacity C1 filtering, diode after rectifier DR rectifications with motor M D rectifications, through resistance current limliting, potentiometer RP adjusts the intensity of output current, so as to adjust the angle of flow of controllable silicon SCR, further Motor M current strength is changed, so as to change motor M rotating speed.

The advantages of general principle and principal character of the present utility model and the utility model has been shown and described above.One's own profession The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification Simply illustrate principle of the present utility model, on the premise of the spirit and scope of the utility model is not departed from, the utility model is also Various changes and modifications are had, these changes and improvements are both fallen within claimed the scope of the utility model.The utility model Claimed scope is by appended claims and its equivalent thereof.

Claims (1)

1. A kind of 1. motor drive circuit, it is characterised in that：By first resistor to 3rd resistor, the first electric capacity to the 3rd electric capacity, Switch, rectifier, diode, potentiometer, controllable silicon and motor composition, two inputs and alternating current of the rectifier The both ends connection in source, the switch is connected on the loop of AC power, the cathode output end of rectifier and meanwhile with the first electric capacity First end, the negative pole of diode connected with the first end of motor, the cathode output end of rectifier simultaneously with the first electric capacity The second end, the positive pole of diode, the first end of the second electric capacity, the first end of 3rd resistor, the first end of the 3rd electric capacity and can The negative pole connection of silicon is controlled, the second end of the second electric capacity is connected with the sliding end of potentiometer and the first end of second resistance simultaneously, the Second end of two resistance is connected with the second end, the second end of the 3rd electric capacity and the control terminal of controllable silicon of 3rd resistor simultaneously, electricity The first end of position device and the first end of first resistor connect, and the second end of first resistor is simultaneously electric with the positive pole of controllable silicon and driving The second end connection of machine.