Motor performance is determined by the output power (Watt Output) divided by power input (Watt Input), or in the way around. The other way, the input power subtracted by the loss power (Watt Loss) divided by input power, designating that 1 horsepower in mechanics domain equals to 746 Watt in electrics domain. The only way to enhance motor performance is to reduce the several losses. The losses from motor, when it does not receive burdens or works (No Load Losses), will be generated in the constant values while motor receives the input power, i.e., the friction loss appearing at motor ball bearing, the loss from air force from motor cooling fan, the loss form rotor air force (for Open Motor IP23), and the loss from metal core, consisting of Hysteresis loss and Eddy Current loss in the magnetic-motor circuit. The loss from motor without loads is around 30% of the overall of each motor loss, and occurs not whether motor spins freely or in the motor working mode. The loss when motor has to receive the burdens or loads
Load losses at stator or rotor are the result of resistance of materials used to produce the conductive stator. The conductor at rotor and magnetic circuit of motor can be controlled the loss by selecting the appropriate materials. For the loss from the burden of work process, it is the result from harmonics. And the loss caused by eddy current can be control by the design and the production control process.