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Resulting in loss of motor "killer"?

Categories: Latest NewsRelease time: 2016-11-08 16:43:00
Source: ZHAOWEIEditor: ZHAOWEI Author: ZHAOWEI

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Advertised efficiency of motors is a big deal in the market. Motor efficiency is a ratio of how well it converts electrical energy into mechanical energy and it is calculated simply by dividing the power into the motor by the power out of the motor.  Lower efficiency leads to higher operating costs over the life of the motor.

Friction Losses – These losses are attributed to the force that it takes to overcome the drag associated with rotating the motor’s rotor or armature. Examples of these are friction of bearings, bushings or brushes in a universal or brushed type DC motor.  In general, the frictional losses are proportional to the rotor speed.

Windage Losses – In an air cooled motor, these losses are caused by turbulence in the air acting against the rotation of the rotor. Examples of these are armature slots or geometries that are not cylindrical or fans.  The windage losses are estimated as being proportional to the cube of the rotor speed.

Iron Losses – Also called core losses, these are associated losses in the magnetic paths of the motor. They are usually characterized as watt loss per mass.  Different steels have different characteristics that impact these losses.  In order to understand iron losses better, they can be further divided into hysteresis losses and eddy current losses.

1. Hysteresis losses are due to the changing polarity of the flux in the steel core. Hysteresis losses are effected by both the ability of the material to change polarity easily and by the total flux density in the steel.

2. Eddy current losses are circulating currents induced in the steel core by the changing polarity of the flux. Eddy current losses are effected by the total flux density, the frequency at which the polarity of the flux changes and area available for eddy currents to flow.  Motor designs use laminated cores of steel to reduce the area available for the eddy currents to flow because the electrons are unable to jump from lamination to lamination.

Stray Losses – Stray losses are generally categorized as losses that don’t correlate to the losses explained above. This is sometimes used as a safety factor in design calculations.

 

 

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