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Explain the requirements of elevator motor. State with reason best suitable motor for elevator.

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Ideal requirements of elevator motor: 1. High starting torque along with high rate of acceleration and retardation. 2. Motors are compact in size especially smaller in diameter. 3. Speed of motor should not exceed 900 rpm 4. It should have sufficient overload capacity. 5. Low initial and maintenance cost. 6. Long life. 7. It should withstand for rapid fluctuation in supply voltage


Following motors are used because it covers all above requirements:- 1. DC Series Motor 2. Ac Series Motor (1-ph) 3. 3-Ph Slip ring I.M 4. Permanent magnet AC Motor. 5. Split Phase AC I.M. 6. Capacitor Start I.M.

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