Electronic circuit of an electromagnetic clutch
AssigneeDeere & Company
InventorManfred Hofmann
Life of this patent
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Abstract
An electric control circuit of an electromagnetic clutch includes a relay-controlled, two-position switch which operates, in response to a power source being disconnected from the switch relay and the clutch, to establish a path to ground through which the induced voltage of the clutch may be dissipated to thereby speed up the disengagement of the clutch once power thereto is discontinued. The control circuit may be that employed in a self-propelled forage harvester equipped with a metal detector, the latter including a normally closed relay switch which opens in response to metal being sensed to thereby de-energize the clutch and two-position switch relay.
Claims5
An electrical control circuit for an electromagnetic clutch, comprising:
- a current supply line adapted for being coupled to a power source;
- a grounding line;
- an electromagnetic clutch having a first end continuously connected to said grounding line;
- a two-position switch means including a bridge joined to a center contact, an input contact and an output contact, with the bridge being movable to connect the center contact either to the input contact or to the output contact;
- said input contact being connected to said current supply line;
- a first connector connected between the center contact and a second end of the clutch;
- and a second connector connected between the output contact and the grounding line in parallel with the continuous connection of the clutch with the grounding line, whereby engagement of said two-position switch bridge with said input contact will result in the clutch being energized and engaged, and engagement of said bridge with said output contact will result in the clutch being de-energized with its induced voltage being immediately dissipated to ground by way of said second connector.
Dependencies are inferred from the claim text.