Blower Motor for Air Conditionner

destruction. Motor will run at 60% of rated power and may well fail to synchronize on start under load = failure is imminent.

Get a three phase autotransformer to step uo the voltage

Note that your motor rating is under 60Hz. What's the frequency of your 380V 3-phase power supply? Is it 50Hz, or 60Hz?

You better off buy yourself a correct motor!

OZ

Hi Hazkhod,

Please check on the motor terminal connections. There might be a provision for reconnecting the motor wiring to fit your power supply of 380 V.

With your motor terminally connected to the 460-V configuration, it will deliver less torque than normal.

Regards,

Neil

I suspect the 380 volt supply is at 50 Hz. If so it should work OK but power output and speed down to 5/6. Current and torque unchanged.

Assuming the fan is on a friction-only system, power absorbed is down to (5/6)³ = 0.58, so motor is not overloaded. But air flow is down to 5/6 and pressure to (5/6)². If the fan is part of a complete aircon system needing airflow based on 460 volt, 60 Hz this is unlikely to be enough. If it's been salvaged and fitted to a different system it depends what the requirements are.

Don't forget, speed will be 5/6 as well.

refer to electrical hand books and find your ^answer2

Hi guys,

3-phase motors with 12 wire-leads out on the terminal are generally designed to work at 220 V, 380 V and 440 V. At 440 -V supply, the motor must be wired using delta connection. At 220-V supply, it must be wired using a double-delta connection. On the other hand, if the supply is 380 V, as in this case, the motor should be wired at double-wye connection. This latter connection produces 380/sqrt(3) = 220 V on every coil of the motor, thereby, drawing the required amperage for steady-state operation.

Please check on the terminal and see the connection. The problem might be solved.

Regards,

Neil