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Message: <blockquote data-quote="jarance" data-source="post: 57860" data-attributes="member: 21">I don't think the correct term to call the variable speed controller a capacitor. A capacitor only smooth the voltage for DC volt application. I think it is the linear power module. Older car use some power resistors to drop the voltage across the motor to control the speed. Modern circuit use voltage regulator to control the speed of a DC motor either by PWM or PAM.btw, previous thread mention the power module cost about RM600 plus.check this thread for more info.<a href="http://bmwclubmalaysia.com/forums/index.php?showtopic=900&st=15" target="_blank">http://bmwclubmalaysia.com/forums/index.ph...topic=900&st=15</a></blockquote>