What is windage loss in motors?
Windage loss is the reduction in efficiency due to windage forces. For example, electric motors are affected by friction between the rotor and air. Large alternators have significant losses due to windage. To reduce losses, hydrogen gas may be used, since it is less dense.
What is mean by windage loss?
Windage loss in a generator is the power absorbed by the fluid surrounding the rotor. as a result of the relative motion between the rotor and the stator.
What are windage losses in DC motor?
If N is the speed, then the windage loss in dc motor is proportional to square of armature speed. Windage losses occur due to the air inside the rotating coil of the machine. Eddy current losses are proportional to square of speed.
How can windage losses be reduced?
To reduce the windage power loss, the vacuum pressure in the sealed space needs to be reduced to a certain level as quickly as possible. The pressure in the sealed space leveled out within 2 s and the proposed structure had sufficient performance to reduce the windage power loss of a high-speed rotor.
What causes windage?
Windage is a force created on an object by friction when there is relative movement between air and the object. There are two causes of windage: the object is moving and being slowed by resistance from the air. a wind is blowing producing a force on the object.
What is friction and windage losses?
Friction and windage losses are caused by friction in the bearings of the motor and aerodynamic losses associated with the ventilation fan and other rotating parts. Variable losses consist of resistance losses in the stator and in the rotor and miscellaneous.
What are the 2 main types of losses in a motor?
Intrinsic losses are of two types: fixed losses – independent of motor load, and variable losses – dependent on load. Fixed losses consist of magnetic core losses and friction and windage losses. Magnetic core losses (sometimes called iron losses) consist of eddy current and hysteresis losses in the stator.
What is stator winding loss?
These losses are also called copper losses. These losses occur due to current flowing in stator and rotor windings. As the load changes, the current flowing in rotor and stator winding also changes and hence these losses also changes. Therefore these losses are called variable losses.
How are windage losses produced?
When the shaft rotates, it displaces air. This incurs an expenditure of energy which is called windage loss. it represents a loss of power. Windage loss in rotatory machines occur due to air resistance to the armature.
How do you calculate friction and windage loss?
1. Multiply current, A, by the driver motor’s torque constant to get the total friction and windage torque, oz • in. 3. Subtract the driver motor’s friction and windage torque from the total friction and windage torque to get the test motor’s friction and windage torque.
What is friction loss of a motor?
Friction Losses These losses are attributed to the force it takes to overcome the drag associated with rotating the motor’s rotor or armature. Examples of friction losses are friction of bearings, bushings or brushes in a universal or brushed type DC motor.
What are the different losses in electric motor?
What is friction loss of A motor?
What are the two 2 main types of losses in a motor?
There are two main kinds of losses in electric motors, which are often referred to as iron losses and copper losses. Dealing first with iron losses, these are made up of two ‘components’, namely eddy current losses and hysteresis losses.
What are the various losses in a motor?
There are three main types losses in induction motor: Copper losses. Iron losses. Friction and windage losses.