1.8 Stepper motor

Which drive system rotates rotor at known angle when number of pulses are applied to the motor?

• Basic bipolar drives

• Closed loop drive

• Open loop drive

• Bipolar chopper drives

When will the motion of the motor tends to be oscillatory in open loop drives?

• Frequency of pulse train is too high

• Initial load is too heavy

• Both of them

• Either

What is the function of closed loop drives?

• Improving performance by feedback

• Both of them

• none

• Switched at proper timing

When will the optical encoder is coupled to rotor position?

• Running condition

• Mid of the starting condition

• equilibrium position

Which is called as relation between rotor present position and phase to be excited?

• Step angle

• Lead angle

• helix angle

• helix step

If static torque decreases, it will reaches?

• Equilibrium (0)

• Equilibrium(N)

• Equilibrium(N+1)