US 11,750,057 B2
Voltage optimization technique for a permanent magnet motor used in an electric submersible pump
Goutham Selvaraj, Houston, TX (US); Yao Duan, Houston, TX (US); Yu Liu, Houston, TX (US); and Mark Rayner, Houston, TX (US)
Assigned to Toshiba International Corporation, Houston, TX (US)
Filed by Toshiba International Corporation, Houston, TX (US)
Filed on Apr. 3, 2020, as Appl. No. 16/839,659.
Claims priority of provisional application 62/829,271, filed on Apr. 4, 2019.
Prior Publication US 2020/0321824 A1, Oct. 8, 2020
Int. Cl. H02K 5/132 (2006.01); F04C 13/00 (2006.01); F04B 49/06 (2006.01); F04D 15/00 (2006.01); H02P 6/08 (2016.01); H02P 25/022 (2016.01); E21B 43/12 (2006.01)
CPC H02K 5/132 (2013.01) [E21B 43/128 (2013.01); F04B 49/06 (2013.01); F04C 13/008 (2013.01); F04D 15/0066 (2013.01); H02P 6/08 (2013.01); H02P 25/022 (2013.01)] 11 Claims
OG exemplary drawing
 
1. 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.