High Efficiency Motor refers to a more efficient motor whose efficiency should meet the relevant energy efficiency rating requirements.
Characteristics
(1) High efficiency, IE2 is 3% higher than IE1, and IE3 is about 5% higher than IE1.
(2) More high quality materials are required. IE2 is 25% to 30% more expensive than IE1 motors, and IE3 is 40% to 60% more expensive than IE1 motors.
(3) Due to the lower operating temperature, the motor has a longer life and can reduce maintenance costs.
(4) The starting current is larger under typical design conditions.
(5) The rotor inertia is large.
(6) The rated speed is higher and the slip rate is smaller.
The energy saving of the motor is a systematic project involving the whole life cycle of the motor. From the design and manufacture of the motor to the selection, operation, adjustment, overhaul and scrapping of the motor, the effect of the energy saving measures should be considered from the entire life cycle of the motor. While converting electric energy into mechanical energy, the electric motor itself also consumes a part of energy. The typical AC motor loss can be divided into three parts: fixed loss, variable loss and stray loss. Variable losses are a function of load, including stator resistance loss (copper loss), rotor resistance loss, and brush resistance loss; fixed losses are independent of load, including core loss and mechanical loss. The iron loss is composed of hysteresis loss and eddy current loss, which is proportional to the square of the voltage. The hysteresis loss is also inversely proportional to the frequency. Other stray losses are mechanical loss and other losses, including bearing friction loss and fan and rotor.
