PWM DC Motor Controller With MOSFET

Friday, April 20th, 2018 - Motor Circuit

The circuit of PWM DC motor controller with MOSFET in the figure below is a circuit of variable speed DC motor with PWM method that uses a power MOSFET and driver be able to control a DC motor up to 3 Ampere. The circuit of PWM DC motor speed controller is built using operational amplifiers (Op-Amp) that functioned as a PWM pulse generator. The working voltage range of this controller can be adapted to the needs of working voltage controlled DC motor. Working frequency PWM DC motor controller with MOSFET This is 400 Hz with a pulse width HIGH and LOW can be controlled. The circuit of DC motor speed controller can be used to control a DC motor of 12 volts to 24 volts. To assemble the circuit PWM DC motor controller with MOSFET This can be seen in the following figure.

The circuit of PWM DC Motor Controller With MOSFET

PWM DC Motor Controller With MOSFET

Here is a list of the components used to assemble a circuit of PWM DC motor controller with MOSFET in the image above.

Circuit Components list PWM DC Motor Controller With MOSFET

R1-R4 : 100K
R5 : 47K
R6-R7 : 3.9K
R8 : 2.7K
VR1 : 10K
C1 :  0.01uF
C2-C5 : 0.1uF
Q1 : IRF521
D1 : 1N4004
LED1 : LED
U1 : LM324N
U2 : 78L12
F1 : 3 Amp
S1 : toggle switch

To create a circuit of PWM DC motor controller with MOSFET as shown above circuit. PCBs can be assembled using a design that has been available below.

PCB Circuit PWM DC Motor Controller With MOSFET

PCB Circuit PWM DC Motor Controller With MOSFET

To control the speed of a DC motor using a circuit of speed controller in the image above can be done by adjusting the lever potentiometer VR1, where the lower the reference voltage supplied to the operational amplifier (Op-Amp) U1b the faster the rotation speed of the DC motor and the higher the reference voltage supplied than the slower rotation speed of a DC motor.

To improve the ability of a circuit of speed controller in the image above can be done by replacing the MOSFET IRF521 MOSFET that has the ability to drain a large current. IRF521 MOSFET in the circuit’s speed controller needs to be equipped with cooling (heat sink) to absorb the heat generated when the MOSFET circuit PWM DC motor controller with MOSFET work.

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