Soft start control method for multiple motors, and inverter using same
AssigneeLs Electric Co., Ltd.
InventorChaebong BAE
Life of this patent
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Abstract
The present disclosure relates to a soft start control method for multiple motors, and an inverter using same. The inverter according to an embodiment of the present disclosure is an inverter which converts supplied alternating current into three-phase ((U, V, W)) alternating current and outputs same, the inverter comprising: 2n relays which operate on/off of respective output switches; and a control unit which controls the respective relays to operate the on/off of the respective output switches so as to control respective motors to be connected to the three phases ((U, V, W)) of the inverter or connected to three phases ((R, S, T)) of an alternating current power source unit.
Claims20
An inverter in a system including n motors (where n is a natural number of 2 or more) and 2n output switches, in which two different output switches are exclusively connected to each motor, the inverter being configured to convert supplied alternating current into three-phase alternating current ((U, V, W)) and output the same, the inverter comprising:
- 2n relays configured to operate on/off states of the respective output switches;
- and
- a control unit configured to control the respective relays to operate the on/off states of the respective output switches so that each motor is connected to either the three-phase ((U, V, W)) output of the inverter or the three-phase ((R, S, T)) output of an AC power source unit,
- wherein the control unit controls the relays such that, at the start of operation of a motor in a stopped state, the corresponding motor is connected to the three-phase ((U, V, W)) output of the inverter.
A control method performed by an inverter in a system comprising:
- the inverter configured to convert supplied alternating current into a three-phase ((U, V, W)) output and output the same;
- n motors, where n is a natural number of 2 or more;
- 2n output switches, two of which are exclusively connected to each of the n motors and are configured to perform on/off operations such that each motor is selectively connected to either the three-phase ((U, V, W)) output of the inverter or a three-phase ((R, S, T)) output of an AC power source unit;
- and
- 2n relays configured to operate the on/off states of the respective output switches,
- the control method comprising:
- receiving a feedback value related to a condition of a target system to which the inverter is applied;
- and
- controlling the respective relays according to the received feedback value so that each motor is connected to either the three-phase ((U, V, W)) output of the inverter or the three-phase ((R, S, T)) output of the AC power source unit,
- wherein the controlling comprises controlling the relays such that, at the start of operation of a motor in a stopped state, the motor is connected to the three-phase ((U, V, W)) output of the inverter.
Dependencies are inferred from the claim text.