Anti-spin control for a separately excited motor drive system
First Claim
1. In a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, the armatures being connected in series to the voltage source, a method of controlling performance of the electric motors, comprising:
- detecting a condition in the system indicating that one of the wheels is slipping;
reducing power delivered to one of the motors that is associated with the slipping wheel in response to the detection of the condition;
providing power to the one or more motors that are not associated with the slipping wheel after the power delivered to the motor associated with the slipping wheel is reduced; and
restoring the power delivered to the one of the motors associated with the slipping wheel in response to a recovery event.
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Accused Products
Abstract
Methods and apparatus for controlling performance of electric motors in a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, the armatures being connected in series to the voltage source include detecting a condition in the system indicating that one of the wheels is slipping, reducing power delivered to one of the motors that is associated with the slipping wheel in response to the detection of the condition, providing power to the one or more motors that are not associated with the slipping wheel after the power delivered to the motor associated with the slipping wheel is reduced, and restoring the power delivered to the one of the motors associated with the slipping wheel in response to a recovery event.
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Citations
49 Claims
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1. In a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, the armatures being connected in series to the voltage source, a method of controlling performance of the electric motors, comprising:
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detecting a condition in the system indicating that one of the wheels is slipping;
reducing power delivered to one of the motors that is associated with the slipping wheel in response to the detection of the condition;
providing power to the one or more motors that are not associated with the slipping wheel after the power delivered to the motor associated with the slipping wheel is reduced; and
restoring the power delivered to the one of the motors associated with the slipping wheel in response to a recovery event.
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2. In a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, the armatures being connected in series to the voltage source, a method of controlling performance of the electric motors, comprising:
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detecting a condition in the system to ascertain when to deactivate one of the motors;
identifying one of the motors to deactivate when the condition is detected;
eliminating current in the identified motor, the current being armature current or field current;
providing armature current and field current to the one or more motors that are not identified as one of the motors to deactivate after the current is eliminated in the identified motor; and
restoring the current in the identified motor in response to a recovery event. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. Apparatus for controlling performance of two or more DC motors used for driving an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, comprising:
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a source of DC voltage;
two or more motor armatures connected in series to the voltage source through an armature control circuit to provide independent control of the motor armatures;
two or more motor field windings coupled to the two or more motor armatures and connected to the source of voltage through a field winding control circuit to provide control of the two or more motor field windings independent of the armatures;
a detection mechanism for detecting a condition in one of the motors, the condition when in a first state indicating that one of the motors is to be deactivated and when in a second state indicating that none of the motors are to be deactivated;
an identification mechanism coupled to the detection mechanism, the identification mechanism adapted for identifying one of the motors to deactivate when the condition is in the first state;
a motor controller coupled to the armatures and the field windings, the motor controller being adapted for eliminating current in the identified motor when the condition is in the first state and for restoring current in the identified motor in response to a recovery event, the current being armature current or field current; and
a drive mechanism for providing armature current and field current to the motors that are not identified by the sensing mechanism as one of the motors to deactivate after the motor controller has eliminated the current in the identified motor. - View Dependent Claims (43, 44, 45, 46, 47, 48)
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49. Apparatus for controlling performance of two or more DC motors used for driving an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, comprising:
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a source of DC voltage;
two or more motor armatures connected in series to the voltage source through an armature controller to provide independent control of the motor armatures;
two or more motor field windings coupled to the two or more motor armatures and connected to the source of voltage through a field winding controller to provide control of the two or more motor field windings independent of the armatures;
a detection mechanism for identifying one of the motors to deactivate;
a shunting mechanism coupled to the detection mechanism and to the field windings for eliminating field current in the identified motor;
a drive mechanism for providing armature current and field current to the motors that are not identified by the detection mechanism as one of the motors to deactivate after the shunting mechanism has eliminated field current in the identified motor; and
a recovery mechanism adapted for restoring field current in the identified motor in response to a recovery event.
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Specification