Hengli motor experts tell you the relationship between motor efficiency and power factor

Discussion by Hengli Motor experts on the efficiency and power factor of motors.

Q=reactive power

P=active power

S=full power (also known as apparent power)

Power factor of the motor: This indicates that the motor can input% of the energy in the power grid as input power to the motor.

The efficiency of the motor=output power of the motor/input power of the motor; The ability of a motor to convert electrical energy into mechanical energy.

There is no linear relationship between power factor and efficiency, only that power factor affects the efficiency of the motor. For example, when designing a motor, if the power factor of the motor is very small and the input voltage of the motor, such as 380V, is determined, it will cause an increase in input current. This increase in input current will lead to an increase in the heat generation of the motor coil and a decrease in motor efficiency.

Detailed concept explanation:

Active power, also known as average power. The instantaneous power of alternating current is not a constant value. The average value of power over a cycle is called active power, which refers to the power consumed by the resistance part in the circuit. For an electric motor, it refers to its output, represented by the letter P. The unit is generally called kilowatts (KW)

Reactive power: In circuits with inductance (or capacitance), the inductance (or capacitance) converts the energy of the power source into the energy of the magnetic field (or electric field) and stores it for half a cycle, and returns the stored magnetic field (or electric field) energy to the power source for the other half of the cycle. They only exchange energy with the power source and do not actually consume energy. We refer to the amplitude value of energy exchanged with the power source as reactive power, represented by the letter Q and measured in kilovar.

Apparent power: In a circuit with resistance and reactance, the product of voltage and current is called apparent power, represented by the letter S or symbol P

S stands for kilovolt ampere (KVA)

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