speed controller for dc motor

5/22/2018 Speed Controller for DC Motor

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CI R C U I T L A B

Speed Controller for DC Motor

T.K. Hareendran

Here is a simple circuit tocontrolthe speed of aDC motor. It can be configured to control the sweep rate of automobwindscreen wiper.

The circuit comprises a timer NE555 (IC1), medium-power driver transistor BD239 (T1), high-power switching transBD249 (T2) and a few other discrete components. It is configured for automobile usage with negative terminal of

power supply connected to ground.

Here IC1 is wired as a low-frequency, free-running astable multivibrator with pulse-width modulation (PWM) controoutput. The R-C components like R1, VR1, R2 and C1 determine the frequency of oscillations. Potmeter VR1 works asmaster speed controller for the motor. Components R3, C3 and C4 decouple the DC supply of the oscillator. A blinking-red LED (LED1) is used for visual indication of power-on.

Battery Circuitwww.te.com/Battery+Circuit

Battery Protection for High Rate Discharge Li-ion Packs.
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9 5Post Comment| 2 Comments

saideepkamishetty 182 days ago

I had previously tried with 12V as supply for timer.but my timer began to get a large amount of heat.can you please suggestany solution for it.

Reply 1 Replykarthic 156 days ago

friend have you used a IC slot for soldering if so try to work with 9V batteryReply

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When the wiper arm of potmeter VR1 is in top position, capacitor C1 charges through R1, R2 and D1 and produces a ptrain at the output of IC1 with long negative and short positive pulse widths. Therefore the motor speed is slow. On other hand, when the wiper arm of VR1 is at the bottom position, C1 charges through R1, R2 and VR1 and dischargesR2. The resulting pulse train has long positive and short negative pulse widths. Now the motor rotates at a high speThe output at pin 3 of IC1 is fed to transistor T1, which, in turn, drives the DC motor through high power switchtransistor T2 at the selected speed. Resistor R4 limits the base current of transitor T2.

Diode D2, connected in antiparallel with the DC motor, limits the back e.m.f. generated by the rotation of the moCapacitor C5 suppresses parasitic oscillations.

The circuit can be powered by 12V DC supply directly from the vehicles battery. For convenience and safety, enclose

a small metallic cabinet. A medium-size veroboard will do for construction. Use a good-quality DIP socket for IC1. Findo not forget to add a suitable heat-sink for transistor T2.

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