# Why does my DC motor have 4 wires?

## Why does my DC motor have 4 wires?

Shunt wound motors Shunt-wound motor generally have 4 wires. Two connect to the (relatively) high resistance field and two connect to the much lower resistance armature. Usually the field winding is brought out separately from the armature, so the motor has four wires.

## How do speed controllers work?

How does a motor speed controller work? All 4QD controllers work by switching the battery connection to the motor on and off around 20,000 times a second using a technique called pulse width modulation [PWM]. The motor averages these pulses out, as this rate of switching is too fast for the motor to detect.

## How do you control speed and torque of a DC motor?

To control DC motors torque, a DC drive will regulate armature current. The armature voltage is unregulated allowing the motor to operate at whatever speed is necessary to achieve the set current /torque level.

## How do you wire a speed controller?

To wire up a DC speed controller, you connect the motor power cables to the motor screw terminals on the controller, and the battery wires to appropriate battery screw terminals on the controller. Be mindful the wires are being gripped firmly and none of the wire strands have gotten loose and are sticking out.

## How do you test a 4 wire DC motor?

Use a multimeter to find the resistance between terminals.

1. If the resistance between any two terminals is high in order of 50 to few hundred ohms then it is a field winding.
2. If the resistance between any terminals is between 0.5 to 10 ohms then it is an armature winding.

## How do I control the speed of a DC motor?

Control the speed of an electric motor in a DC series circuit by placing a potentiometer or a rheostat between the motor and the power source. Adjusting the potentiometer or rheostat changes its resistance value and alters the voltage going to the motor.

## How can the speed of a DC motor be controlled?

Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage By varying the flux, and by varying the current through the field winding By varying the armature voltage, and by varying the armature resistance

## How to control the speed of a DC induction motor?

How to Control Speed of Induction Motor One of the ways to control the speed of the induction motor is by changing the applied voltage to the motor. Another way or technique to control the speed of the induction motor is of course by changing the applied frequency. One of the important techniques to control the speed of the induction motor is by changing the number of stator poles.

## What is speed control in DC motors?

This intentional change of drive speed is known as speed control of a DC motor. Speed control of a DC motor is either done manually by the operator or by means of an automatic control device.