### Calculation formulas related to electric motors

Date：2023-08-21 Author：XINDA MOTOR

_{1}of the rotating magnetic field of the motor stator .

_{1}=60f/P, where n

_{1}is the synchronous speed, r/min; f is the AC power frequency, Hz; P is the number of pole pairs of the motor.

_{.}working status. The speed difference is represented by the slip s.

_{1}-n)/n

_{1}. Where s is the slip rate; n

_{1}is the synchronous speed, r/min; n is the speed of the motor rotor, r/min.

_{1}=(1-s)×60f/P, where s is the slip; n

_{1}is the synchronous speed, r/min; f is the AC power frequency, Hz; P is the magnetic pole of the motor logarithm.

_{1}=√3UIcosφ. Where P

_{1}is the input power, W; U is the supply voltage, V; I is the stator current, A; cosφ is the power factor.

_{1}-P

_{loss}. Where P is the motor power, W; P

_{1}is the input power, W; P

_{loss}is the loss of the motor itself.

_{1})×100%=(P/√3UIcosφ)×100%. Where η is the motor efficiency; P is the motor power, W; P

_{1}is the input power, W; U is the power supply voltage, V; I is the stator current, A; cosφ is the power factor.