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Technical Paper

Reducing Conducted Transients in Automotive Windshield Wiper Motors

2006-04-03
2006-01-0297
When an electric motor is switched off, an amount of energy, dependent on the design of the motor, can be emitted to the power device. Some of this energy is stored in the capacitors and needs to be discharged when the circuit is shut off. Also, the current through the inductive components changes rapidly, causing a large voltage to be discharged from the circuit. This phenomenon poses potential problems in automotive applications since this energy surge, known generally as a conducted transient, could cause damage to other electrical devices that share the same power grid. Automotive motors generally also have radio frequency interference filtering devices, which are significant contributors to this conducted transient energy.
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