Electric motors.?

Question

Does anybody know about motor impedance? does a 120 volt motor cost more to operate than a 240 volt motor?

This is single phase and I was told that motor impedance made 240 volt cost less.

Answer 1

whats the load?

what are you doing w\ the motor?

Answer 2

A 120 V motor has a lower efficiency and a lower power factor than a 240 V motor of the same horsepower. It is therefore more costly to operate than the 240 V motor on 3 counts, as it also draws twice as much current for the same load. The cost of running a 120 V motor can be 21% greater than that for a 240 V motor.

Answer 3

The term Impedance, in general, refers to the complex sum of a device electrical resistance, inductance, and capacitance. Almost everything in nature exhibits some kind of impedance to electricity.

Motor's impedance is not among the interesting characteristics. Parameters of importance are the capacity, the power ratings, the torque, the rpm, and the efficiency. The higher those parameters, the more powerful the motor, and the better the motor. However, those parameters are related in such a way that requires trade offs. You just can't have all of them in one package.

Motors are selected based on the applications. Some things might require high torque, others might require high speed, etc...

The efficiency is what determines the operation cost. The more efficient the motor, the less it will cost to operate.

Answer 4

A 120VAC motor costs more to operate than a 240VAC motor, because it is lower voltage, so it draws more amperage. I know that all electrical properties are somehow related in one way or another, but I am not sure how impedance is related.

Answer 5

120vac motors and SINGLE phase 240vac motors pull the same amps. 240vac 3 phase motors draw less amps. Bottom line is that it wont matter for a household type application, industrial is a different story with different vac availability.