# Why does a DC motor have 4 wires?

## Why does a DC motor have 4 wires?

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.

## What are the four wires on a DC motor?

The motor has 4 leads, it says to turn clockways, hook two leads to + voltage and two to common ground. To turn counterclockways, swap one pair, such as take one wire from + and hook to ground, and vice versa. The motor works when I connect leads direct to power and ground.

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 you identify the terminals on a DC motor?

DC motor terminal leads are labeled for easy identification in the motor’s terminal box. For example, leads labeled “A1” and “A2” are connected to the armature through the motor’s brushes; leads labeled “S1” and “S2” are the ends of the series field; and leads labeled “F1” and “F2” are the ends of the shunt field.

### What is a 4 wire motor?

4 wire stepper motor is a bipolar stepper motor which should be be driven in bipolar mode. The stepper motor driver uses an h-bridge circuit to actually reverse the current flowing through the phase. All coils can be operated to rotate the stepper motor by alternating polarity excitation phase.

### How many terminals does a DC motor have?

A DC motor has two terminals: positive and negative. When the positive wire is connected to the positive terminal and the negative wire connected to the negative terminal, the motor rotates clockwise. When they are reversed, the motor rotates counter clockwise.