Motor control mechanism for electric vehicles
First Claim
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1. A system for controlling a vehicle wheel motor, comprising:
- a velocity switch;
a first phase comprising;
a first switch coupled to the velocity switch,a first coil coupled to the first switch,a second coil, anda first node coupled between the first coil and the second coil, the first node further coupled to the first switch;
a second phase comprising;
a second switch coupled to the velocity switch,a third coil coupled to the second switch,a fourth coil, anda second node coupled between the third coil and the fourth coil, the second node further coupled to the second switch;
a third phase comprising;
a third switch coupled to the velocity switch,a fifth coil coupled to the third switch,a sixth coil, anda third node coupled between the fifth coil and the sixth coil, the third node further coupled to the third switch;
a fourth node coupled to the second coil, the fourth coil, and the sixth coil;
a fifth node coupled between the third switch and the fifth coil;
a fourth switch coupled between the fifth node and the third coil; and
a fifth switch coupled between the fifth node and the first coil, the fourth switch and the fifth switch forming a dynamic braking switch, wherein;
a current is bi-directional through the first phase, the second phase, and the third phase,the first switch, the second switch, and the third switch are configured to selectively place the first phase, the second phase, and the third phase in a first configuration to maximize wheel motor torque or in a second configuration to reduce a total back electromotive force (BEMF) from each motor coil,in the first configuration, the first switch, the second switch, and the third switch are selectively in a first position to place the first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil in a serial configuration to maximize the wheel motor torque, andin the second configuration, the first switch, the second switch, and the third switch are selectively in a second position to place the first coil, the second coil, the third coil the fourth coil, the fifth coil, and the sixth coil in a parallel configuration to reduce the total BEMF and increase the angular velocity in the first phase, the second phase, and the third phase.
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Abstract
An apparatus for controlling a wheel motor is provided. A plurality of switches is provided for controlling a direction of current through motor coils of the wheel motor. A brushless motor control circuit is connected to each of the plurality of switches. Responsive to a request to adjust one of an angular velocity and an angular acceleration of the wheel motor, the plurality of switches are activated to place the motor coils in a predetermined configuration to maximize torque or reduce a total back electromotive force (BEMF) from the motor coils.
33 Citations
14 Claims
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1. A system for controlling a vehicle wheel motor, comprising:
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a velocity switch; a first phase comprising; a first switch coupled to the velocity switch, a first coil coupled to the first switch, a second coil, and a first node coupled between the first coil and the second coil, the first node further coupled to the first switch; a second phase comprising; a second switch coupled to the velocity switch, a third coil coupled to the second switch, a fourth coil, and a second node coupled between the third coil and the fourth coil, the second node further coupled to the second switch; a third phase comprising; a third switch coupled to the velocity switch, a fifth coil coupled to the third switch, a sixth coil, and a third node coupled between the fifth coil and the sixth coil, the third node further coupled to the third switch; a fourth node coupled to the second coil, the fourth coil, and the sixth coil; a fifth node coupled between the third switch and the fifth coil; a fourth switch coupled between the fifth node and the third coil; and a fifth switch coupled between the fifth node and the first coil, the fourth switch and the fifth switch forming a dynamic braking switch, wherein; a current is bi-directional through the first phase, the second phase, and the third phase, the first switch, the second switch, and the third switch are configured to selectively place the first phase, the second phase, and the third phase in a first configuration to maximize wheel motor torque or in a second configuration to reduce a total back electromotive force (BEMF) from each motor coil, in the first configuration, the first switch, the second switch, and the third switch are selectively in a first position to place the first coil, the second coil, the third coil, the fourth coil, the fifth coil, and the sixth coil in a serial configuration to maximize the wheel motor torque, and in the second configuration, the first switch, the second switch, and the third switch are selectively in a second position to place the first coil, the second coil, the third coil the fourth coil, the fifth coil, and the sixth coil in a parallel configuration to reduce the total BEMF and increase the angular velocity in the first phase, the second phase, and the third phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification
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Current AssigneeGlobalfoundries US Incorporated (GlobalFoundries, Inc.)
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Original AssigneeInternational Business Machines Corporation
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InventorsBates, Allen Keith, Bui, Nhan Xuan, Hancock, Reed Alan, Imaino, Wayne Isami, Winarski, Daniel James
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Primary Examiner(s)Benson, Walter
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Assistant Examiner(s)Carrasquillo, Jorge
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Application NumberUS12/355,495Publication NumberTime in Patent Office1,369 DaysField of Search318/139, 320/127US Class Current318/432CPC Class CodesH02P 1/04 Means for controlling progr...H02P 3/12 by short-circuit or resisti...
