how to vary the speed of a dc motor?

[popoyboys]

how to vary voltage

can anyone help me how to make a 12-volt dc motor work at varying speed?
can anyone share some circuits or ideas with it?

does varying the speed affect the torque of the dc motor?

 

[flatulent]

how to vary speed of dc motor

The standard method is to use pulse width modulation of the driving voltage.

 

[popoyboys]

how to vary dc voltage

does anyone here have that circuit?
is there any way i could fix this problem other than with a PWM technique as mentioned here?

 

[IanP]

how to vary dc motor speed

You can do it using linear regulator, but this method is energy inefficient ..
If you want to study more on linear regulators google for something like LM317, LM350, or similar ..

On the other hand, a simple PWM control of a DC motor can be realized with 555 timer ..
Here are more details:
**broken link removed**

Regards,
IanP

 

[Mr.Cool]

vary dc voltage

to very the speed of a DC motor you must vary the current. think of a constant voltage power supply with a series POT resistor of huge watt rating. that is all you need.

simple question, simple answer

good luck
Mr.Cool

 

[Azaruk]

how to vary the speed of a dc motor

PWM IS the most efficient method, both for control and low-speed torque.

Check out some of the RC modelling and model railway sites for some cool ideas.

 

[redrose20881]

vary the speed of a dc motor

oh yes you need apulse width modulator ic and apower transistor
so that you can controlling the speed by changing the duty cycle

 

[tanzil_dhk]

how to vary current

surely varying a speed of a dc motor will affect the torque. but u can calculate ur required speed,keeping ur torque constent.everything depends on exactly what u needed.
and PWM is the most efficient way and its easy to implement....

 

[maggots]

lm350 for dc motor

You can use PWM or control its voltage input

 

[mark123]

vary the speed of dc motor

I had a 2 wire DC drill that could speed control ! the speed measurement was achieved by looking at the current pulses and the drive modified to maintain the required speed for varying loads. Normally 3 wires ( or some form of feedback) would be used

 

[fly-boy]

Re: vary dc voltage

Actually, the speed applied to the DC motor varies with the voltage across it. The torque produced varies with the current.

I realize it's an old post but surely that question will pop up to someone else

I'll agree with Mr. Cool on the use of a POT. Either use it in series with the motor or use it in a voltage divider configuration. I'm actually asking myself which is best, that how i ended up on that post.

 

[baltee]

The most common method of speed control is PWM or pulse width modulation.

 

[kam1787]

did the OP find a circuit? It would help if you gave some more parameters for the motor - at least the amperage