Stepper_p

According to the sources, what is a critical constraint for the starting pulse rate in an open-loop stepper motor positioning drive?

• It must be the maximum pulse rate achievable by the motor
• It must be in the Start-region and low enough to meet the pull-in torque constraint
• It must be higher than the pull-out torque limit
• It should be in the fall-down region of the pull-out torque characteristic

In the example positioning drive described, a hybrid stepper motor rotates a turntable through a speed reduction gear. What is the specified ratio of this gear?

• 0.1111111111111111
• 8 days, 8:01:00
• 4 days, 4:01:00
• 0.18055555555555555

For forward rotation of a 3-phase SRM, according to the sources, when are rectangular current pulses typically applied to successive phases?

• To coincide with the negative variation of the phase inductance with rotor position (dL/dθ)
• Continuously for the duration of the rotation
• To coincide with the positive variation of the phase inductance with rotor position (dL/dθ)
• When the phase inductance is at its minimum value

What is the total moment of inertia (J) referred to the motor shaft in the example stepper motor positioning drive, considering the motor and the turntable with a 100:1 gear reduction?

• 7 × 10⁻⁶ kgm²
• 5 × 10⁻² kgm²
• 12 × 10⁻⁶ kgm²
• 57 × 10⁻⁶ kgm²

In an SRM drive, what signal is used to determine the exact instants for applying current pulses to the motor phases?

• Speed feedback from the load
• Current feedback from the motor phases
• Torque feedback from the motor shaft
• Rotor position feedback

According to the operational constraints for a stepper motor positioning drive, the acceleration and deceleration of the pulse rate must be limited by which motor characteristic?

• The holding torque
• The pull-out torque
• The detent torque
• The rated speed

Which of the following is listed as a strength of Switch Reluctance Motor (SRM) drives in the sources?

• Low noise level
• No external rotor position sensor is required
• Creates low torque ripple at high speed
• High starting torque without high inrush current

In the example stepper motor drive, how is the total angle rotated by the motor calculated?

• By multiplying the total transit time by the maximum pulse rate
• By taking the area under the pulse-rate versus time graph and multiplying by the step angle
• By dividing the total number of pulses received by the motor resolution
• By summing the acceleration, constant speed, and deceleration times

According to the sources, is a Switch Reluctance Motor (SRM) drive typically used with open-loop or closed-loop control?

• Open-loop control, similar to some stepper drives
• Closed-loop control, using feedback signals
• Both open-loop and closed-loop control depending on the application
• Neither, it uses a fixed switching pattern

What is the load torque (T_Load) from the turntable, referred to the motor shaft, in the example stepper motor drive?

• 4 Nm
• 0.04 Nm
• 40 mNm
• 100 Nm