Externally excited electric machine and stator winding reconfiguration method
AssigneeDana Automotive Systems Group, LLC
InventorsFrederik Desmet, Joachim Druant
Life of this patent
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Abstract
Systems and methods for an externally excited electric machine. The method for operation of the externally excited electric machine, in one example, includes operating the externally excited electric machine above a threshold speed in a first stator winding configuration of a stator and switching the stator from the first winding configuration to a second winding configuration while the externally excited electric machine is maintained above the threshold speed. In the system, the externally excited electric machine includes multiple rotor windings which are configured to be externally excited.
Claims17
A method for operation of an externally excited electric machine system, comprising:
- operating an externally excited electric machine above a threshold speed in a first stator winding configuration of a stator;
- and
- switching the stator from a first winding configuration to a second winding configuration while the externally excited electric machine is maintained above the threshold speed;
- wherein the externally excited electric machine includes a plurality of rotor windings configured to be externally excited, and
- wherein switching the stator from the first winding configuration to the second winding configuration includes reducing a field current which is delivered to the rotor windings to an upper threshold value for the switching event.
An externally excited electric machine system, comprising:
- a stator;
- a dynamic winding reconfiguration device configured to switch a winding configuration of the stator;
- a rotor including a plurality of rotor windings configured for external excitation;
- and
- a controller including instructions that when executed by the controller, in response to receiving a stator shift request and when an externally excited electric machine is operated over a threshold speed, cause the controller to:
- switch the stator between a first winding configuration and a second winding configuration, including:
- decreasing a field current delivered to the plurality of rotor windings to an upper threshold for shifting in response to receiving the stator shift request;
- and
- in response to the field current reaching or approaching the upper threshold, decreasing a stator current delivered to the stator to zero.
A method for operation of an externally excited synchronous electric machine system, comprising:
- during a stator winding reconfiguration event when an externally excited synchronous electric machine is operating above a threshold speed, reducing a stator current supplied to a dynamically reconfigurable stator to zero and operating switches in the dynamically reconfigurable stator to alter the configuration of the dynamically reconfigurable stator while the stator current is maintained at zero;
- and
- during the stator winding reconfiguration event, prior to reducing the stator current, reducing a field current supplied to a plurality of rotor windings to an upper threshold value for the stator winding reconfiguration event.
Dependencies are inferred from the claim text.