US 12,407,278 B2
Method of detecting forward and reverse connection of three-phase motor and solid-state motor starter
Qing Yang, Shanghai (CN); Ying Shi, Shanghai (CN); and Xiaohang Chen, Shanghai (CN)
Assigned to Schneider Electric (China) Co., Ltd., Beijing (CN)
Filed by Schneider Electric (China) Co., Ltd., Beijing (CN)
Filed on Nov. 27, 2023, as Appl. No. 18/519,560.
Claims priority of application No. 202311160710.6 (CN), filed on Sep. 8, 2023.
Prior Publication US 2025/0088126 A1, Mar. 13, 2025
Int. Cl. H02P 1/16 (2006.01)
CPC H02P 1/16 (2013.01) 10 Claims
OG exemplary drawing
 
1. A method of detecting forward and reverse connection of a three-phase motor, wherein the three-phase motor is connected to a power supply through a solid-state motor starter comprising a solid-state switch module, a forward and reverse switch module, a first output terminal, a second output terminal and a third output terminal, the solid-state switch module is configured to turn on or off between the power supply and the three-phase motor and comprises a first solid-state switch pair, a second solid-state switch pair and a third solid-state switch pair respectively corresponding to a first phase, a second phase and a third phase of the power supply, the forward and reverse switch module is configured to set the forward and reverse connection of the three-phase motor, the first output terminal, the second output terminal and the third output terminal are respectively configured to connect a first motor terminal, a second motor terminal and a third motor terminal, respectively, the first solid-state switch pair is connected to the first output terminal, and the second solid-state switch pair and the third solid-state switch pair are connected to one of the second output terminal and the third output terminal, respectively, through the forward and reverse switch module,
wherein the method of detecting comprises:
turning on the first solid-state switch pair and the second solid-state switch pair into conduction for a predetermined period of time so that current can flow between the power supply and the three-phase motor;
detecting output current of the solid-state motor starter; and
determining the forward and reverse connection state of the three-phase motor based on the output current of the solid-state motor starter,
in a case that currents exist at the first output terminal and the second output terminal, it is determined that the three-phase motor is in the forward connection state, and in a case that currents exist at the first output terminal and the third output terminal, it is determined that the three-phase motor is in the reverse connection state.