Patent ID: 6239566
Filing Date: 2001-05-29
Classification: B60L,H02H,H02P,Y02T

Abstract:
A drive system for a permanently excited electric motor having at least one phase winding, the drive system comprising:at least one half-bridge arrangement for each of said at least one phase winding of the electric motor;an intermediate circuit connecting each half-bridge arrangement to a motor supply voltage source;a drive arrangement for driving each of said at least one half-bridge arrangement to apply a voltage having a predetermined polarity to each of said at least one phase winding assigned to a respective one of said at least one half-bridge arrangement for a predetermined period of time; andan operating state registering arrangement for registering at least one operating state of the drive system and electric motor, said drive arrangement generating a command to produce a short circuit between each of the at least one phase winding of the motor in response to the presence of at least one predetermined operating state registered by said operating state registering arrangement, wherein each of said at least one half-bridge arrangements comprises at least one first switch element for selectively connecting the associated at least one phase winding of the electric motor with a motor supply voltage having a first polarity and at least one second switch element for selectively connecting the associated at least one phase winding of the electric motor with the motor supply voltage having a second polarity, wherein the generated command for producing a short circuit causes all switch elements of said at least one first and said at least one second switch elements of each of said at least one half-bridge arrangements to be switched on.