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US 10,651,768 B2Granted
Motor control device and method for controlling motor control device
AssigneeLG Electronics Inc.
InventorsYonghwa Lee, Donggeun Lee, Jeongeon Oh
Life of this patent
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Abstract
Provided are a motor control device and a method for controlling a motor control device. A switching frequency is varied with respect to a control sampling for controlling an inverter, whereby controlling is performed by securing a required control sampling according to a motor speed.
Claims10
A motor control device comprising:
- an input unit that receives external power;
- an inverter that converts power from the input unit into AC power and provides the converted AC power to a motor;
- a single current sensor that detects a current at the inverter as a basis for measuring a rotation speed of the motor;
- and
- a controller that measures the rotation speed of the motor based on the detected current and controls a switching operation of the inverter according to the rotation speed,
- wherein the controller varies a switching frequency of the inverter based on a control sampling for controlling the inverter,
- wherein the controller calculates a maximum control sampling according to the rotation speed, compares a current control sampling with the maximum control sampling, and adjusts the switching frequency according to a comparison result, and
- wherein when the current control sampling is less than or equal to the maximum control sampling, the controller determines a switching frequency corresponding to the maximum control sampling and adjusts the switching frequency to the determined switching frequency.
5 more elements
A method for controlling a motor control device having a single current sensor, the method comprising:
- detecting, by the single current sensor, a current for a motor;
- determining, by a controller, a rotation speed of the motor based on the detected current from the single current sensor;
- calculating, by the controller, a reference control sampling corresponding to the rotation speed;
- comparing a current control sampling with the reference control sampling;
- and
- adjusting a switching frequency of an inverter included in the motor control device according to a comparison result of the current control sampling and the reference control sampling,
- wherein the reference control sampling is a maximum control reference for the determined rotation speed, and
- wherein the adjusting the switching frequency of the inverter includes, when the current control sampling is less than or equal to the maximum control sampling, determining a switching frequency corresponding to the maximum control sampling and changing the switching frequency to the determined switching frequency.
5 more elements
Dependencies are inferred from the claim text.