Rotor position estimation of a permanent magnet synchronous-machine for high performance drive
AssigneeThe University of Tennessee Research Corporation
InventorsMalakondaiah Naidu, Bimal K. Bose
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Abstract
The invention comprises an apparatus and a method for controlling permanent magnet AC machines. Stator voltages and stator currents are sensed to produce signals which are utilized by a digital circuit to calculate control signals for the machine.
Claims8
A method for controlling a permanent magnet synchronous machine including a stator having at least three windings such that said permanent magnet synchronous machine rotates in a desired direction at a desired speed, including the steps of:
- a) electrically determining if a rotor of said machine is stationary to generate a zero rotation state signal;
- b) selectively applying electrical signals to said stator in response to said zero rotation state signal to generate a stationary rotor position signal;
- c) measuring the operating voltages applied to and the operating currents flowing in said stator windings and in response thereto calculating a rotational velocity signal and a rotor position signal;
- and
- d) utilizing said zero rotation state signal, said stationary rotor position signal, said rotor position signal and said rotational velocity signal to control said operating voltages applied to said stator windings to cause said rotor to rotate in the desired direction and at the desired speed.
A controller for a permanent magnet synchronous machine having at least three stator windings, comprising in combination:
- a) first means for determining the rotational state of a rotor of said machine to generate a zero rotation state signal;
- b) second means responsive to said zero rotation state signal to selectively apply electrical signals to said rotor such that said rotor remains stationary and for measuring the voltage applied to and the currents flowing in said stator windings to produce first voltage and first current signals;
- c) third means selectively responsive to said first voltage and first current signals to generate a rotor position signal;
- d) fourth means responsive to a second voltage applied to and the currents flowing in said stator winding to generator a rotor velocity signal;
- and
- d) fifth means responsive to said rotor position and rotor velocity signals to control said second voltage applied to said stator windings to cause said rotor to rotate in a desired direction and at a desired velocity.
Dependencies are inferred from the claim text.