Which motor is described as having greater starting torque in the comparison with a shaded pole motor?

Which motor is described as having greater starting torque in the comparison with a shaded pole motor?

• A. Shaded pole motor
• B. CSR
• C. Three-phase motor
• D. PSC motor

Answer: (D)

The starting torque is driven by how well the motor creates a rotating magnetic field when it’s at rest. Shaded pole motors use shading coils to produce a weak rotating field, which gives them very low starting torque and sluggish startup. Permanent Split Capacitor (PSC) motors, on the other hand, have a capacitor permanently connected to the auxiliary winding. This capacitor creates a larger phase shift between the main and auxiliary windings, delivering a stronger starting current and a much more robust rotating field. That stronger initial rotating field translates directly into higher starting torque than the shaded pole design, and it also improves running efficiency compared with a shaded pole motor. So, in this comparison, the PSC motor is described as having greater starting torque.

The starting torque is driven by how well the motor creates a rotating magnetic field when it’s at rest. Shaded pole motors use shading coils to produce a weak rotating field, which gives them very low starting torque and sluggish startup. Permanent Split Capacitor (PSC) motors, on the other hand, have a capacitor permanently connected to the auxiliary winding. This capacitor creates a larger phase shift between the main and auxiliary windings, delivering a stronger starting current and a much more robust rotating field. That stronger initial rotating field translates directly into higher starting torque than the shaded pole design, and it also improves running efficiency compared with a shaded pole motor. So, in this comparison, the PSC motor is described as having greater starting torque.