Three phase 200 volt motor

Why does Baldor (USA) make a 200 volt motor. Should one be wary of running this motor on 245 volts?

Why I can''t answer. I would use a transformer for 200 volts. Motors, among other magnetic devices, are designed to operate at 10% overvoltage. 245 volts is outside of this tolerance band and can cause overheating even without a load.

Tom

Cannot say why, but do see them running on 208v which is within the 10% tolerance.

For every voltage level, there are two values: Distribution Voltage and Utilization Voltage. Utilization Voltage is always lower than Distribution because it is EXPECTED that there will be a voltage drop between the Service Entrance (where the Utility is required to deliver their product within spec), and the motor terminations at the machine. So for example 480V is the Distribution Voltage, motors are designed for 460V as the Utilization Voltage. The same then holds true for 240V / 230V and if the service is 208V 3 phase, the utilization Voltage is 200V. In addition, Distribution Voltage from the utility is required to be +-5% max, whereas Utilization Voltage designs for equipment are typically +-10%, giving an even wider range of acceptability.

In real life, many motor mfrs use a different approach for 208V services, based on assuming that these will be smaller facilities with less distance from service-to-motor and that motors will typically be 10HP or less. So they design the motors to have a wider voltage tolerance, as in -15% +10%. That results in a motor that will have a "triple rating" of 208-230/460V on the nameplate, meaning it can accept 230V - 15% (196v) which covers the 208V service - 5% (198V).

But for motors over 10HP or for volume OEMs that don't want to pay a little more for that extra voltage tolerance, they then go back to making a straight 200V motor design for use on 208V systems.