Induction Motor Generator Efficiency

Commercial institutional and particularly industrial operations use substantial amounts of power for electric motors.

Induction motor generator efficiency.

Induction motors give best efficiency at their operating point. Slip for ac induction motors courtesy all about circuits induction motors of 50 100 hp for industrial applications vary in weight from 700 to almost 1 000 lbs. Constant or fixed losses. 5 to 10 hp.

However the range of good efficiency varies with individual motors and tends to extend over a broader range for larger motors as shown in figure 1. Apply our formula motor efficiency 45 100 55 81 8. The squirrel cage induction motor makes an excellent generator when it is driven above its synchronous speed. Constant losses are those losses which are considered to remain constant over normal working range of induction motor the fixed losses can be easily obtained by performing no load test on the three phase induction motor.

A regular ac induction motor usually can be used as a generator without any internal modifications. Induction generators operate by mechanically turning their rotors faster than synchronous speed. A motor s efficiency tends to decrease dramatically below about 50 load. Peak efficiency is at 7 5 hp.

High efficiency induction motors. With rising demand for high efficiency or energy efficient induction motors designers and manufacturers are stepping up their production of such. A motor is considered. An induction generator or asynchronous generator is a type of alternating current ac electrical generator that uses the principles of induction motors to produce electric power.

See the chart below for torque vs. Motor efficiency improvement epact was passed in 1992 but motor efficiency provisions took effect in 1997. In most cases this is about 120 of the motor s rated horsepower when operating as a generator. The same features that make this motor desirable over the other types of motors makes the induction generator desirable over other types of generators namely the inherent ruggedness of the squirrel cage design and the simplicity of the control systems.

The motor has 81 8 efficiency. Normal motors run 50 efficient as a generator baldor motors run in the 80 s. Generally pumps like refrigeration pumps or water pumps will use an induction motor so as to achieve. There are two types of losses occur in three phase induction motor these losses are constant or fixed losses variable losses.

Efficiency of three phase induction motors can vary from 85 to 96. Although high or premium efficiencies may have only a few percentage points better. Ie5 energy class is the highest efficiency motor as well as eff3 class motors are the lowest energy class motor.