There are downsides to brushless fuel pumps, though, one of which involves the electronics needed to control, operate and start the motor. Since the solenoid coils now surround a permanent magnet armature, they need to be switched on and off like the old commutators. To achieve this, the use of semiconductors, complex electronics, logic circuits, field effect transistors and hall effect sensors will control which coils are turned on and when to force rotation. This results in higher production costs for brushless fuel pump motors.
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