Control of motor soft starter using power electronic switching devices
AssigneeEaton Intelligent Power Limited
InventorsJin Li, Xin Zhou, Steven A. Dimino, Kaijam Maurice Woodley
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Abstract
Systems and methods for soft starting a motor (40) using solid-state switching devices are disclosed. The system (10) includes a soft starting switch (53) that is made of a plurality of solid-state switches (62, 63). The system (10) also includes a controller (86) that is programmed to regulate currents and voltages delivered to the motor (40) during a start-up operation of the motor by cycling the solid-state switches (62, 63) ON and OFF during the start-up operation.
Claims13
A method of soft starting a motor, the method comprising:
- providing a soft starting switch that is electrically connected between a power source and an alternating current (AC) motor, wherein:
- the soft starting switch comprises one or more phases, each of which comprises:
- a power electronic switching device that comprises a plurality of solid-state switches electrically connected in series or in parallel with each other;
- and
- by a controller, cycling the solid-state switches ON and OFF during a start-up operation to regulate currents and voltages delivered to the AC motor during the start-up operation.
A system for soft starting a motor, the system comprising:
- a soft starting switch comprising:
- a line side for connecting to a power source and a load side for connecting to a motor, and
- a power electronic switching device that is positioned between the line side and the load side, and that comprises a plurality of solid-state switches electrically connected in series or in parallel with each other;
- and
- a controller configured to regulate currents and voltages delivered to the motor during a start-up operation of the motor by cycling the solid-state switches ON and OFF during the start-up operation.
Dependencies are inferred from the claim text.