TYPES OF ELECTRIC MOTORS BASIC INFORMATION AND TUTORIALS

Types of electric motors. Electric motors are manufactured in a number of different types. They may be divided into three main groups, depending upon the type of electric system from which they are designed to operate: dc, single-phase ac, and polyphase ac.

There are several types of motors in each one of these groups, constructed so that they produce different starting and running characteristics. The principal types of electric motors follow:

Direct-current

Shunt-wound

Straight shunt-wound

Stabilized shunt-wound

Series-wound

Compound-wound

Permanent magnet

Polyphase alternating-current

Induction

Squirrel-cage

Normal-torque, normal-starting-current

Normal-torque, low-starting-current

High-torque, low-starting-current

Low-torque, low-starting current

High-resistance-rotor

Automatic-start

Multispeed

Wound-rotor

Commutator, brush-shifting

Synchronous

Direct-current excited

Permanent-magnet

Reluctance

Single-phase alternating-current

Repulsion

Induction

Shading-pole–starting

Inductively split-phase–starting

Capacitor-type

Capacitor start

Permanent-split capacitor

Two-value capacitor

Repulsion-start, induction-run

Repulsion-induction

Series

Universal

Series-wound

Compensated series-wound