Glossary of Motor Terms
Slip ring
A slip ring is a ring-shaped piece of copper that allows current to pass through the winding via sliding contact.
However, it is not intended for commutation as in DC motors and AC commutator motors. There are three motors
that use this:
(1) Winding type induction motor: (fig. a)
(2) Variable Field Synchronous Motor: (fig. b)
(3) Rotary armature type motor (double-rotor motor): A motor with a structure in which the stator (armature) of
a normal synchronous motor or brushless motor rotates in one direction, while the rotor rotates in the opposite
direction. Power is supplied to the armature through the slip ring. The purpose is to gain (increase) the speed
relative to the armature even if the rotor is turning at low speed or stopped.
Term List (S)
- Salient-pole torque
- Salient-pole rotor-stator
- Sensorless drive
- Separately-excited DC motor
- Shaft, shapes of
- Simulation
- Sinusoidal voltage
- Skew,Skewed slots
- Slip ring
- Slot liner
- Slotless rotor
- Slot-pole combination
- Slots and teeth
- Small electrical motor
- Solenoid
- Space factor, Slot fill factor
- Speed control
- Speed variation rate
- Spindle motor
- Squirrel cage rotor
- Squirrel-cage induction motor
- Stall torque
- Starting torque
- Sturgeon's motor
- Switched reluctance motor
- Switched reluctance motor, Early
- Switching elements
- Synchronous speed