Invention Grant
- Patent Title: Apparatus and methods for reduced voltage starting of motors with bumpless force transition
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Application No.: US18052879Application Date: 2022-11-04
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Publication No.: US12034395B2Publication Date: 2024-07-09
- Inventor: Stan R. Simms , Thomas A. Farr , Gabriel Teixeira Braga
- Applicant: Eaton Intelligent Power Limited
- Applicant Address: IE Dublin
- Assignee: Eaton Intelligent Power Limited
- Current Assignee: Eaton Intelligent Power Limited
- Current Assignee Address: IE Dublin
- Agency: Baker Botts L.L.P.
- Main IPC: H02M1/34
- IPC: H02M1/34 ; H02P6/21

Abstract:
A reduced voltage starter for electric motors comprises a controller, and a plurality of semiconductor switches to selectively connect a power source to a motor. The controller is configured to apply a first voltage ramp to provide a controllable fraction of the full line voltage to the motor, while maintaining a current flow to be within a programmable current limit during motor startup. The controller is further configured to implement a bumpless force transition, by applying a second voltage ramp when the speed of the motor is below the rated motor speed, and force transition criteria correlated with overheating of the semiconductor switches and/or a connected load are met.
Public/Granted literature
- US20240154552A1 Apparatus and Methods for Reduced Voltage Starting of Motors with Bumpless Force Transition Public/Granted day:2024-05-09
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