System and method for transient-based motor speed estimation with transient excitation
First Claim
1. A motor speed estimation system for estimating the speed of an electric motor driven by a switching system including a plurality of switching devices coupled between a power source and the motor and individually operative to selectively couple a corresponding motor lead to the power source according to a corresponding switch control signal from a switch control system, the speed estimation system comprising:
- a transient excitation system operatively coupled with the switch control system to selectively modify at least one switch control signal to excite a motor transient; and
a transient-based speed estimation system receiving at least one feedback signal or value from the switching system and providing a rotor speed estimate at least partially according to the feedback signal or value;
wherein the transient excitation system selectively removes individual pulses from a series of pulses forming the at least one switching control signal controlling a corresponding one of the switching devices to excite the motor transient.
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Abstract
Control systems and speed estimation systems are presented having a transient-based speed estimation system that provides a rotor speed estimate based on a measured speed-related motor transient signal, and a transient excitation system which selectively modifies at least one switch control signal to excite the measured motor transient.
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Citations
16 Claims
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1. A motor speed estimation system for estimating the speed of an electric motor driven by a switching system including a plurality of switching devices coupled between a power source and the motor and individually operative to selectively couple a corresponding motor lead to the power source according to a corresponding switch control signal from a switch control system, the speed estimation system comprising:
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a transient excitation system operatively coupled with the switch control system to selectively modify at least one switch control signal to excite a motor transient; and a transient-based speed estimation system receiving at least one feedback signal or value from the switching system and providing a rotor speed estimate at least partially according to the feedback signal or value; wherein the transient excitation system selectively removes individual pulses from a series of pulses forming the at least one switching control signal controlling a corresponding one of the switching devices to excite the motor transient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A motor speed estimation system for estimating the speed of an electric motor driven by a switching system including a plurality of switching devices coupled between a power source and the motor and individually operative to selectively couple a corresponding motor lead to the power source according to a corresponding switch control signal from a switch control system, the speed estimation system comprising:
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a transient excitation system operatively coupled with the switch control system to selectively modify at least one switch control signal to excite a motor transient; and a transient-based speed estimation system receiving at least one feedback signal or value from the switching system and providing a rotor speed estimate at least partially according to the feedback signal or value; wherein the transient excitation system selectively removes at least one pulse from select pulse pairs of a series of pulse pairs forming the at least one switching control signal controlling a corresponding one of the switching devices to excite the motor transient. - View Dependent Claims (15)
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16. A motor speed estimation system for estimating the speed of an electric motor driven by a switching system including a plurality of switching devices coupled between a power source and the motor and individually operative to selectively couple a corresponding motor lead to the power source according to a corresponding switch control signal from a switch control system, the speed estimation system comprising:
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a transient excitation system operatively coupled with the switch control system to selectively modify at least one switch control signal to excite a motor transient; a transient-based speed estimation system receiving at least one feedback signal or value from the switching system and providing a rotor speed estimate at least partially according to the feedback signal or value; and a rotor flux initialization system operatively coupled with the switch control system to selectively initialize rotor flux in the motor during starting prior to activation of the transient excitation system.
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Specification