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How to Change the Speed With a Winding Motor

One of the most common types of electric motors is the winding motor. This motor has windings on the armature and the field coil. These motors are often used in variable-speed applications. There are a number of ways to control the speed of a winding motor. Some methods are governed by the motor design and others are governed by the power applied to the motor. The most common is pulse width modulation.

Things You'll Need

12V DC winding motor
12V battery
Pulse width modulation circuit
Electrical wire
Wire stripper
Wire cutter

Instructions

- 1
  Cut four pieces of electrical wire and strip 1/2-inch of insulation off of each end of all of the wires. Take two of the wires and connect the positive and negative terminals of the battery to the positive and negative input terminals of the pulse width modulation circuit respectively.
- 2
  Take the second two wires and connect the positive and negative output terminals of the pulse width modulation circuit to the positive and negative terminals of the DC motor respectively. Turn the modulaion circuit on and the motor should start spinning.
- 3
  Change the modulation frequency and see what happens to the motor speed. As the modulation is decreased, the motor will slow down. If the modulation is increased, it will speed up. Pulse width modulation sends pulses of power to the motor. Short pulses send less power than long pulses, so the motor speed is low. As the length of the pulse increases, so does the motor speed.

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