Which motor type is described as having more starting torque when compared to a shaded pole motor?

Which motor type is described as having more starting torque when compared to a shaded pole motor?

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

Answer: (C)

Starting torque comes from how strongly the motor can create a rotating magnetic field when the rotor is still. Shaded pole motors produce only a weak rotating field because the shading bands in the poles delay part of the field, so their starting torque is low. A permanent-split capacitor motor keeps a capacitor permanently in series with the auxiliary winding, which creates a larger phase shift and a stronger rotating field right at startup. That stronger rotating field translates to higher starting torque than a shaded pole motor. So, the PSC motor is described as having more starting torque in comparison to a shaded pole motor. (For context, other designs can offer even higher starting torque, but PSC clearly outperforms shaded-pole in this aspect.)

Starting torque comes from how strongly the motor can create a rotating magnetic field when the rotor is still. Shaded pole motors produce only a weak rotating field because the shading bands in the poles delay part of the field, so their starting torque is low. A permanent-split capacitor motor keeps a capacitor permanently in series with the auxiliary winding, which creates a larger phase shift and a stronger rotating field right at startup. That stronger rotating field translates to higher starting torque than a shaded pole motor. So, the PSC motor is described as having more starting torque in comparison to a shaded pole motor. (For context, other designs can offer even higher starting torque, but PSC clearly outperforms shaded-pole in this aspect.)