ELECTRIC MOTOR CONTROL
First Claim
1. An electric motor system comprising a motor having a magnetic rotor and a magnetically conductive stator, the stator having at least two windings connected with one another in series, the rotor and stator together defining at least a first magnetic circuit encircling a first portion of a first one of the stator windings, the stator defining at least a second magnetic circuit therein, a second one of the stator windings wrapped around a portion of the stator remote from the first magnetic circuit, the second stator winding and said portion of the stator thereby providing an inductor assembly, the second magnetic circuit passing through said stator portion and encircling a second portion of the first stator winding and a portion of the second stator winding, the second magnetic circuit remote from the first magnetic circuit and remote from the rotor, the motor system having a buck regulation apparatus connected in series between a direct current (DC) electricity source and the second winding, wherein the inductor assembly provides a filter inductor function for the buck regulator.
1 Assignment
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Accused Products
Abstract
A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The system includes aspects which permit, among other things, electromagnetically disconnecting a failed permanent magnet motor from said system, weight savings in motor control electronics, controllability benefits and other benefits.
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Citations
15 Claims
- 1. An electric motor system comprising a motor having a magnetic rotor and a magnetically conductive stator, the stator having at least two windings connected with one another in series, the rotor and stator together defining at least a first magnetic circuit encircling a first portion of a first one of the stator windings, the stator defining at least a second magnetic circuit therein, a second one of the stator windings wrapped around a portion of the stator remote from the first magnetic circuit, the second stator winding and said portion of the stator thereby providing an inductor assembly, the second magnetic circuit passing through said stator portion and encircling a second portion of the first stator winding and a portion of the second stator winding, the second magnetic circuit remote from the first magnetic circuit and remote from the rotor, the motor system having a buck regulation apparatus connected in series between a direct current (DC) electricity source and the second winding, wherein the inductor assembly provides a filter inductor function for the buck regulator.
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8. A method for controlling an electric motor system, the system including at least one motor having a magnetic rotor and a magnetically conductive stator having at least one winding, the rotor and stator together defining at least a first magnetic circuit encircling a first portion of a first one of the stator windings, the stator defining at least a second magnetic circuit therein, the second magnetic circuit encircling a second portion of the first stator winding, the second magnetic circuit remote from the first magnetic circuit and remote from the rotor, the method comprising the steps of:
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operating the motor to drive an output shaft thereof, the step of operating including the step of saturating at least a portion of the second magnetic circuit to maintain an impedance of said winding at a first value during operation; requiring motor shutdown; and
thenshutting down the motor, including the step of de-saturating at least said portion of the second magnetic circuit to increase the impedance of the winding to a second value, the second value significantly higher than the first value such that current flow in the winding is effectively limited to a desired value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. The invention as described in the attached specification and drawings.
Specification