Position and velocity sensorless control for a motor generator system operated as a motor using exciter impedance
First Claim
1. A motor generator system comprising:
- a prime mover for driving an output shaft;
a main motor and generator having a rotor, driven by the output shaft, for producing electrical power on at least one output winding in response to the prime mover rotating the output shaft and for driving the output shaft in response to operation as a motor;
an exciter having a rotor, driven by the output shaft, for applying excitation to a field winding of the main motor generator during operation for producing electrical power on the at least one output winding and for applying current to the field winding of the main motor generator to produce a magnetic field in the field winding during operation of the main motor generator as a motor;
circuitry, responsive to current in a field winding of the exciter, for producing an output signal representing a position of the rotor of the main motor generator; and
a main inverter, responsive to the output signal, for commutating application of current to the at least one output winding to control operation of the main motor generator during operation as a motor.
1 Assignment
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Accused Products
Abstract
A motor generator system (120) in accordance with the invention includes a prime mover (21) for driving an output shaft (18), a main motor generator (105), having a rotor driven by the output shaft, for producing electrical power on at least one output winding (36a-36c) in response to the prime mover rotating the output shaft and for driving the output shaft in response to operation as a motor; an exciter (102) for applying excitation to a field winding (34) of the main motor generator during operation for producing electrical power on the at least one output winding and for applying current to the field winding of the main motor and generator to produce a magnetic field in the field winding during operation of the main motor generator as a motor; circuitry (122), responsive to current in a field winding (204) of the exciter, for producing an output signal representing a position of the rotor of the main motor generator driven by the output shaft; and a main inverter (114), responsive to the output signal, for commutating application of electrical current to the at least one output winding to control operation of the main motor generator during operation as a motor.
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Citations
21 Claims
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1. A motor generator system comprising:
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a prime mover for driving an output shaft; a main motor and generator having a rotor, driven by the output shaft, for producing electrical power on at least one output winding in response to the prime mover rotating the output shaft and for driving the output shaft in response to operation as a motor; an exciter having a rotor, driven by the output shaft, for applying excitation to a field winding of the main motor generator during operation for producing electrical power on the at least one output winding and for applying current to the field winding of the main motor generator to produce a magnetic field in the field winding during operation of the main motor generator as a motor; circuitry, responsive to current in a field winding of the exciter, for producing an output signal representing a position of the rotor of the main motor generator; and a main inverter, responsive to the output signal, for commutating application of current to the at least one output winding to control operation of the main motor generator during operation as a motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of commutation of a motor generator system having a prime mover for driving an output shaft, a main motor generator having a rotor driven by the output shaft for producing electrical power on at least one output winding in response to the prime mover rotating the output shaft and for driving the output shaft in response to operation as a motor, an exciter having a rotor, driven by the output shaft for applying excitation to a field winding of the main motor generator during operation for producing electrical power on the at least one output winding and for applying current to the field winding of the main motor generator to produce a magnetic field in the field winding during operation of the main motor generator during operation as a motor comprising:
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applying excitation to a field winding of the exciter during operation of the main motor generator as a motor; in response to the excitation of the field winding of the exciter producing a signal representing rotary position of the rotor of the main motor generator; and commutating the flow of current in the at least one output winding of the main motor generator in response to the signal representing rotary position of the rotor of the main motor generator to operate the main motor generator to drive the output shaft. - View Dependent Claims (18, 19, 20)
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21. A motor generator system comprising:
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a main motor generator, having a rotor mounted on a shaft, for producing electrical power on at least one output winding in response to rotation of the output shaft and for driving the output shaft in response to operation as a motor; an exciter, having a rotor mounted on the shaft, for applying excitation to a field winding of the main motor and generator during operation for producing electrical power on the at least one output winding and for applying current to the field winding of the main motor generator to produce a magnetic field in the field winding during operation of the main motor generator as a motor; circuitry, responsive to current in a field winding of the exciter, for producing an output signal representing a position of the rotor of the main motor generator; and a main inverter, responsive to the output signal, for commutating application of electrical current to the at least one output winding to control operation of the main motor generator during operation as a motor.
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Specification