The iron loss, friction loss and windage loss
can be calculated from the operating speed of the motor, but the magnet and copper losses are functions of stator current which should be derived based on the electromagnetic torque.
The mechanical losses include friction loss [W.sub.F] due to bearing friction, and windage loss
[W.sub.W] because of air resistance, which is primarily caused by the cooling fan.
Losses of motor Standard Copper Aluminium (Watts) (Watts) (Watts) Copper Loss of Stator Winding(W) 260.675 256.402 264.222 Copper Loss of Rotor Winding (W) 129.932 100.225 212.575 Iron-Core Loss (W) 93.3603 93.4121 93.2175 Frictional and Windage Loss
(W) 20.4319 20.5867 20.0131 Stray Loss (W) 50 50 50 Total Loss (W) 554.398 520.626 640.028 Input Power (kW) 4.35461 4.32051 4.44025 Output Power (kW) 3.80021 3.79989 3.80022 Losses of motor A Cu Vs Al (Watts) Copper Loss of Stator Winding(W) -7.82 Copper Loss of Rotor Winding (W) 122.35 Iron-Core Loss (W) 0.1937 Frictional and Windage Loss
(W) 0.5736 Stray Loss (W) 0 Total Loss (W) 119.402 Input Power (kW) Output Power (kW) 3.79975 TABLE 4: SCRIM and SARIM Efficiency.
Unlike frictional loss, windage loss
increases non-linearly with speed.
The total motor power loss SAP is defined as the sum of the stator copper loss ([[DELTA]P.sub.Cus]), the stator stray load loss ([[DELTA]P.sub.dods]), the core loss ([[DELTA]P.sub.Fe]), the friction and windage loss
([[DELTA]P.sub.m]), the rotor copper loss ([[DELTA]P.sub.Cur]) and the rotor stray load loss ([[DELTA]P.sub.dodr]).
OEM specification compliance reduces windage loss
, optimizes electric generating capacity, reduces air emissions, extends equipment life and reduces contamination and corrosion for enhanced reliability.
According to Praxair, Proton's HOGEN hydrogen generators are capable of producing byproduct-free hydrogen from electricity and water as well as increasing the efficiency of a utility's electric generators by reducing windage loss
The motor efficiency is discussed with the friction and windage loss
According to the formula given in the previous section, mechanical loss (windage loss
) is not related to [L.sub.bi] and it is 3,286W for the simulation machine.
In particular, the friction and windage losses
drop rapidly as the speed is reduced.
* Viscous drag, also called windage losses
, which are related to velocity (Fig.
* Integrated dry sump oiling reduces internal windage losses
, and an integrated oil reservoir on the lower left side of the crankcase helps to keep the engine compact.