Stepper Motors Quiz

Stepper motors move in steps because of:

• Constant torque

• Sequential energizing of stator coils

• Rotor inertia

• Slip rings

The rotor in a Variable Reluctance Stepper Motor is made of:

• Permanent magnets

• Laminated soft iron

• Copper coils

• Solid steel

Permanent Magnet Stepper Motors use:

• Iron rotor

• Gear wheels

• Permanent magnets on rotor

• Hydraulic force

In Hybrid Stepper Motors, the rotor is:

• Non-magnetic

• A combination of soft iron and permanent magnets

• Wound rotor

• Plain cylinder

The step angle of a stepper motor depends upon:

• Motor size

• Stator voltage

• Number of stator and rotor teeth

• Cooling method

Principle of operation of VR stepper motor is based on:

• Coulomb's law

• Lenz's law

• Reluctance minimization

• Permanent magnetic flux

Single-stack VR motor typically has:

• Only one rotor pole

• Rotor and stator aligned without displacement

• One set of windings across the stator

• Magnetic field from the rotor

Multi-stack VR motors increase torque by:

• Adding gear trains

• Using different excitation

• Stacking multiple displaced stator-rotor pairs

• Reducing step size manually

A stepper motor offers:

• Continuous rotation

• Fixed angle displacement

• Variable speed without feedback

• Instant full-speed start

Which motor is best for precise angular positioning?

• Induction motor

• DC shunt motor

• Stepper motor

• Universal motor