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| Example of the Week |
2012-01-30
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* Analysis of a Claw Pole Alternator
Claw pole alternators are used in automotive applications for providing the electrical power for a variety of electrical components and for charging the battery.
As the number of electrical components in cars increases, the alternator is required to deliver more output power even at low speed.
This note presents the use of magnetic field analysis to evaluate the output power of a claw pole alternator.
· Eddy Current Density Distribution/ Magnetic Flux Density Distribution
Eddy currents generated on the surface of the claw pole on the rotor core causes energy loss and reduce the efficiency of the alternator. The eddy currents also effect the flux density distribution, so that they must be taken into account when performing an analysis of the alternator at high powers.
· Alternator Output
The large current ripple during the transient phase is caused by the inductance of the stator coil and the eddy currents of the rotor core.
The smaller ripple at the steady state is caused by commutation.
The average current in the steady state is 40.8 Amperes.
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