Why do stepping motors have teeth machined into the stator poles and rotor? When a stepping motor is connected to ac power, how many phases must be applied to the motor? How many degrees out of phase...

Why do stepping motors have teeth machined into the stator poles and rotor?

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

How many degrees out of phase are the voltages of a two-phase system?

What is the synchronous speed of an eight-pole stepping motor when connected to a two-phase, 60-Hz ac line?

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