US 12,113,470 B2
Method for coconstant torque control of EC motor in ventilation system
Wenqing Bian, Zhongshan (CN); Xiansheng Zhang, Zhongshan (CN); and Jinren Guan, Zhongshan (CN)
Assigned to ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD., Zhongshan (CN)
Filed by Zhongshan Broad-Ocean Motor Co., Ltd., Zhongshan (CN)
Filed on Dec. 16, 2022, as Appl. No. 18/083,449.
Claims priority of application No. 202210365015.2 (CN), filed on Apr. 8, 2022.
Prior Publication US 2023/0327585 A1, Oct. 12, 2023
Int. Cl. H02P 6/08 (2016.01)
CPC H02P 6/08 (2013.01) 12 Claims
OG exemplary drawing
 
1. A method, comprising:
1) defining a maximum speed spd_max_ref and a minimum speed spd_min_ref of an electronically commutated motor (ECM) within a constant-torque operation range;
2) by using a proportional integral (PI) controller, calculating an upper reference torque T_ref_up with the maximum speed spd_max_ref as a first reference speed, and calculating a lower reference torque T_ref_low with the minimum speed spd_min_ref as a second reference speed; and T_ref_up>T_ref_low;
3) receiving an externally input torque command Tcom;
4) comparing the torque command Tcom, the upper reference torque T_ref_up, and the lower reference torque T_ref_low to determine a target torque Tact; and
5) controlling the ECM to operate in a constant torque mode under the target torque Tact.