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 electrically isolated from one another, 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 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, a first direct current (DC) electricity source connected to the first stator winding and a second DC electricity source connected to the second stator winding, the motor system having a buck regulation apparatus connected to the first DC source and the first winding, the buck regulation apparatus having an inductor assembly configured to provide a filter inductor function for the buck regulator.
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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 electrically isolated from one another, 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 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, a first direct current (DC) electricity source connected to the first stator winding and a second DC electricity source connected to the second stator winding, the motor system having a buck regulation apparatus connected to the first DC source and the first winding, the buck regulation apparatus having an inductor assembly configured to provide a filter inductor function for the buck regulator.
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9. 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 two windings electrically isolated from one another, 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 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, a first direct current (DC) electricity source connected to the first stator winding and a second DC electricity source connected to the second stator winding, the motor system having a buck regulation apparatus connected to the first DC source and the first winding, the buck regulation apparatus having an inductor assembly configured to provide a filter inductor function for the buck regulator, 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 (10, 11, 12, 13, 14, 15)
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Specification