Chapter 35

What is the principal of operation of a stepping motor?

Stepping motors operate on the theory that like magnetic poles repel and unlike magnetic poles attract

What does the term bifilar mean?

The term bifilar means that there are two windings wound together

Why do stepping motors have teeth machined in the stator poles and rotors?

To allow for better stepping resolution

When a stepping motor is connected to AC power, how many phases must be applied to the motor?

2 phases

What is the synchronous speed of an eight pole stepping motor when connected to a 2 phase, 60 hertz AC line?

72RPM

How can the holding torque of a stepping motor be increased?

DC voltage can be applied to one or both windings when the motor is turned off

Explain the difference in operation between a stepping motor and a common DC motor.

Stepping motors differ from DC motors in that their output shaft moves through a specific angular rotation each time the motor receives a pulse.