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Why can't the motor efficiency reach 100%
From the following figure, the motor power transmission is as follows:
• input power P1
• stator iron loss △ PFE1
• stator copper loss △ pcu1
• rotor copper loss △ pcu2
• mechanical loss △ Po
• output power P2
• motor efficiency
• iron loss includes hysteresis loss and eddy current loss
• copper loss is the loss caused by the DC resistance of the specified rotor 1. The ultra-high efficiency motor is improved in each energy loss link:
1. Optimize design to reduce mechanical loss △ Po
• high quality ball bearings to reduce friction and vibration
• locked bearings reduce end clearance
• fans and fan enclosures are designed for proper cooling and quieter operation • smaller fans produce less losses
• lower motor operating temperature allows smaller fans to be used
2. The optimized design reduces the stator copper loss △ pcu1
• more winding
• improved slot design
• ISR (inverter spike resistant) magnetic line provides up to 100 times voltage peak resistance
• end straps are provided at both ends of the motor stator
• low temperature rise (< 80 ° C)
• class F insulation system
• under the upper limit of allowable maximum temperature, the insulation life can be doubled every 10 ° C lower operating temperature
3. The optimized design reduces the rotor copper loss △ pcu2 and mechanical loss
• improved rotor insulation
• high pressure die cast aluminum rotor
• rotor dynamic balance
4. The design reduces the iron loss △ PFE1
• thinner silicon steel laminations
• improve the characteristics of steel to achieve lower loss and provide the same performance
• optimized air gap