Voltage optimization technique for a permanent magnet motor used in an electric submersible pump
AssigneeToshiba International Corporation
InventorsGoutham Selvaraj, Yao Duan, Yu Liu, Mark Rayner
Life of this patent
Estimating the term…
Abstract
A method for controlling a permanent magnet (PM) synchronous motor in an ESP application is provided. A load angle of the PM motor is estimated. A voltage adjustment value is determined for the PM motor based at least on the estimated load angle of the PM motor. A voltage to be applied to the PM motor is determined based on the voltage adjustment value.
Claims11
A method for controlling a permanent magnet (PM) synchronous motor, comprising:
- estimating a load angle of the PM motor by:
- estimating a rotor angle of the PM motor, wherein the rotor angle corresponds to an induced electromagnetic field (EMF) within the PM motor;
- obtaining an open loop reference angle of the PM motor, wherein the reference angle corresponds to a terminal voltage of the PM motor;
- and
- calculating the load angle as a difference between the open loop reference angle and the rotor angle;
- determining a voltage adjustment value for the PM motor based at least on the estimated load angle of the PM motor;
- and
- determining a voltage to be applied to the PM motor based on the voltage adjustment value.
A computer-readable medium for storing instructions which when processed by at least one processor perform a method for controlling a permanent magnet (PM) synchronous motor, the method comprising:
- estimating a load angle of the PM motor by:
- estimating a rotor angle of the PM motor, wherein the rotor angle corresponds to an induced electromagnetic field (EFM) within the PM motor;
- obtaining an open loop reference angle of the PM motor, wherein the reference angle corresponds to a terminal voltage of the PM motor;
- and
- calculating the load angle as a difference between the open loop reference angle and the rotor angle;
- determining a voltage adjustment value for the PM motor based at least on the estimated load angle of the PM motor;
- and
- determining a voltage to be applied to the PM motor based on the voltage adjustment value.
Dependencies are inferred from the claim text.