Electric Motor Speed Formula

N shaft rotation speed rev min rpm.

Electric motor speed formula. The synchronous speed can be calculated as. The full torque from zero speed is a major advantage for electric vehicles. Normally at it s top at operating speed. Rotor speed η m 1200 r min.

This can be found on the nameplate of the motor. Hz frequency or cycles sec. η m mechanical shaft speed. The torque is the twisting force that makes the motor running and the torque is active from 0 to 100 operating speed.

Slip of a motor can be found from the formula. It is motor speed and torque the turning force of the motor. Where η sync 120 50 4 1500 r min. Where p out output power measured in watts w.

Note an induction motor will never reach its. F frequency of electrical power supply hz cycles sec 1 s. P number of poles. S η sync η m η sync 100.

The rotor speed of a 4 pole induction motor at 50 hz is 1200 r min. For a 50 hz system the formula would be. η sync speed of magnetic field. The power supply frequency and.

Rpm shaft rotation speed or revolutions per minute. Motors run at a specific revolutions per minute rpm and a speed reducer is needed if you want to keep that motor but have a lower rpm. Zero at 0 speed and. The power produced by the motor depends on the speed of the motor and is.

Poles number of poles of your motor. For example 50 hz or 60 hz. Motors supposed to do some work and two important values define how powerful the motor is. Calculating the rpm resulting from a motor and speed reducer assembly requires only basic mathematical knowledge.

50 x 60 x 2 6 000 no load rpm ã number of poles. The motor speed in rpm is calculated as n s 2 cdot 60 cdot dfrac f p. So for example if you have a 4 pole motor on 60 hz then rpm 60 2 4 60 1800 rpm. Output mechanical power of the motor could be calculated by using the following formula.

The motor speed calculator calculates the synchronous motor speed from the following parameters. 60hz is the most common frequency in the us. Note that when an ac motor is loaded the spinning magnetic field in the stator does not change speed. The synchronous speed for an electric induction motor is determined by.

F supply frequency hz. For example 2 or 4. The number of poles in the motor winding. Using this formula you can see that a four pole motor operating on the bench under no load conditions runs at 1 800 rpm 7 200 ã 4 poles.

50hz is the most common frequency outside the us. A four polethree phase induction motorwhen operated at 60 hz will be very close to 1800rpm synchronous speed the rated full load speed will be less than synchronous speed by the value of slip a four polethree phase induction motorwith a ratedfull loadspeed of 1750 has a slip rating of 2 7 by formula. N f 2 p 60 1. P out τ ω.