# Quick Answer: How do you slow down a 12v DC motor?

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## How do I slow down my 12vdc fan?

1. Add a potentiometer in series with the power cable. This would allow you to change the speed quite easily. …
2. control the fan using pwm. This could be with a microcontroller or just a 555 oscillator through a transistor. …
3. Have a constant current circuit.

## How do you gear down a motor?

The “reduction” or gear ratio is calculated by dividing the number of teeth on the large gear by the number of teeth on the small gear. For example, if an electric motor drives a 13-tooth pinion gear that meshes with a 65-tooth gear, a reduction of 5:1 is achieved (65 / 13 = 5).

## How can we change the speed of a DC motor using PWM?

If such a signal is fed to a DC motor, we can change the speed of the motor by changing the duty cycle of the PWM signal. The change in pulse width is created by increasing the on-time (HIGH value) of the pulse while reducing the off-time (LOW value) by the same amount so that the frequency of the signal is constant.

## Which is the most effective way of controlling a DC shunt motor above rated speed?

The electrical speed control has many economical as well as engineering advantages over mechanical speed control. There are so many methods for controlling the speed of a DC shunt motor but field rheostat control method is most reliable, economic and independent of load on the motor.

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## How can I slow down DC fan speed?

DC voltage control is the method to vary DC fan speed and this can be implemented by incorporating resistances in the supply wire. The voltage drop across the series resistor reduces the voltage reaching the fan supply pin, automatically slowing the speed of the fan.

## How do I slow down my one speed fan?

With a Shaded Pole motor, you can simply reduce the voltage, say with a light dimmer and the motor produces less torque, then with less torque the air friction on the fan blades causes it to slow down, which in turn moves less air.