Position: Index > Basic Circuit >

How to build Pulse Width Modulation DC Motor Control

2015-01-18 17:26  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

Description

Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor. While the latter approach works well, it generates heat and hence wastes power. This simple pulse width modulation DC motor control eliminates these problems. It controls the motor speed by driving the motor with short pulses. These pulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.

Circuit diagram

Pulse Width Modulation DC Motor Control-Circuit diagram

Parts

R1 1 Meg 1/4W ResistorR2 100K PotC1 0.1uF 25V Ceramic Disc CapacitorC2 0.01uF 25V Ceramic Disc CapacitorQ1 IRF511 MOSFET or IRF620U1 4011 CMOS NAND GateS1 DPDT SwitchM1 Motor (See Notes)MISC Case, Board, Heatsink, Knob For R2, Socket For U1

Notes

R2 adjusts the speed of the oscillator and therefore the speed of M1.M1 can be any DC motor that operates from 6V and does not draw more than the maximum current of Q1. The voltage can be increased by connecting the higher voltage to the switch instead of the 6V that powers the oscillator. Be sure not to exceed the power rating of Q1 if you do this.Q1 will need a heatsink.Q1 in the parts list can handle a maximum of 5A. Use the IRF620 for 6A, if you need any higher.







Reprinted Url Of This Article:
http://www.circuit-finder.com/categories/pwm-and-power-control/299/pulse-width-modulation-dc-motor-control