Overview
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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. |
Closeup |
Closeup |
Alternator Output
Closeup |
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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