Tech Support Forum - View Single Post

**octaneman** · 05-31-2009, 08:55 PM

Hi lacchuji

There 2 types of electrical motors, AC driven and DC driven. You have to find out which of the 2 you got. AC motors have brushes and thermal fuses in the field windings that propel the armature. In DC motors its magnets that act as the field core, In DC motors there is an external diode bridge ( It's a square metal box in the middle with a bolt going through the center of it on some models) that connects the switch to the armature. The bridge changes AC to DC to allow the motor to work. If the motor is AC you need to replace the thermal fuse. If its DC you need to replace the bridge.

05-31-2009, 08:55 PM	#2 (permalink)
octaneman Mentor Home Support, Gearhead Automotive Center Join Date: May 2009 Posts: 560 OS: WINXP	Re: Black & Decker MM575 electric lawn mower Hi lacchuji There 2 types of electrical motors, AC driven and DC driven. You have to find out which of the 2 you got. AC motors have brushes and thermal fuses in the field windings that propel the armature. In DC motors its magnets that act as the field core, In DC motors there is an external diode bridge ( It's a square metal box in the middle with a bolt going through the center of it on some models) that connects the switch to the armature. The bridge changes AC to DC to allow the motor to work. If the motor is AC you need to replace the thermal fuse. If its DC you need to replace the bridge. Last edited by octaneman; 05-31-2009 at 09:00 PM.