Brushless dc machine
AssigneeRobetr Bosch GmbH
InventorMartin-Peter Bolz
Life of this patent
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Abstract
In a brushless, electronically commutated direct-current machine, in particular a direct-current motor, having a multiphase stator winding (12) and having electronic power switches (15) that are connected in series with the winding phases (13), in order to rapidly switch off the direct-current machine when there is at least one defective power switch (15), a malfunction protection device is provided, which has a fuse (16) that is electrically heated in the event of a malfunction and that has a fuse wire (17), which carries the machine current (FIG. 1).
Claims9
A brushless, electronically commutated direct-current machine, in particular a direct-current motor, having a multiphase stator winding (12), having electronic power switches (15) that are connected in series with the winding phases (13) of the stator winding (12), and having a control unit (11) that controls the power switches (15), wherein a malfunction protection device that has a fuse (16) is provided, which is heated by an electrical heating current in the event of a malfunction and has a fuse wire (17) that carries the machine current, and the fuse wire (17) is embedded in a ceramic tube (22) and a heating wire (18) is wound in the form of a heating spiral (19) onto the ceramic tube (22), wherein the heating wire (18) is connected in series with an electronic switch (20) that closes in the event of a malfunction and this series circuit is connected in parallel with the stator winding (12).
Dependencies are inferred from the claim text.