What is primary for a motor selection voltage,power,current or ?
Answer:
When you are selecting a motor the first thing to consider is torque. That will tell you what it takes to actually get the load started and turn it at all.
Close behind that is speed. You need to know how fast you want the load to turn. AC motors have only a few standard speed ratings. The synchronous speeds are given by RPM(revolutions per minute)=120*frequency/poles. The frequency is usually 50 or 60 Hz. The number of poles is an even number, usually 2, 4 or 6. Motors with more than 6 poles are rarely used. You will probably need some kind of speed reduction such as a gear box or pulleys.
Power is proportional to speed X torque. Horsepower = LbsFt X RPM / 5252. Watts = Nm X Revs per sec.
After that you decide what voltage to use. The power and voltage determine the current. If the current is too high for practical wiring, you are forced to use a higher voltage.
Its always the Voltage. This is because higher the voltage, the more amount of charge will flow through the coil and more heating will take place ( due to resistance). Thus there's a limit to the amt. of voltage that can be applied or else the coil may break.
voltage and phase
It is the load you are driving determines the motor rating. It is called Brake Horse Power or BHP that is the output of the motor in hp or watts. The voltage is determined based on the hp rating of the motor. In general motor rating upto 200W are low voltage i.e. 440V. Higher the rating higher the voltage.
motors are rated in horse power.roughly 750 watts = 1 Horse...
Motor operate at different voltages and phases for efficiency /power factor & cost.
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