System and method for driving a motor to rotate at a high speed

Patent metadata

Field	Value
Publication number	US-2021013819-A1
Application number	US-201916662242-A
Country	US
Kind code	A1
Filing date	Oct 24, 2019
Priority date	Jul 10, 2019
Publication date	Jan 14, 2021
Grant date	—

Abstract

A system and a method for driving a motor to rotate at a high speed are provided. The system includes a lookup table, a command detector, a pattern selector and a motor driver. The lookup table module is configured to store a reference waveform pattern and a modulated waveform pattern. An amplitude of the modulated waveform pattern is larger than an amplitude of the reference waveform pattern. The command detector is configured to receive a rotating speed command. The pattern selector is configured to receive the reference waveform pattern and the modulated waveform pattern, and select the reference waveform pattern or the modulated waveform pattern according to the rotating speed command. The motor driver is configured to output a driving signal to drive the motor according to the selected reference waveform pattern or modulated waveform pattern.

First claim

What is claimed is:

1 . A system for driving a motor to rotate at a high speed, comprising:
a lookup table module configured to store a reference waveform pattern and a modulated waveform pattern, wherein a waveform of the reference waveform pattern is different from a waveform of the modulated waveform pattern, and an amplitude of the modulated waveform pattern is larger than an amplitude of the reference waveform pattern; a command detector configured to receive a rotating speed command; a pattern selector connected to the lookup table module and the command detector, and configured to receive the reference waveform pattern and the modulated waveform pattern and select the reference waveform pattern or the modulated waveform pattern according to the rotating speed command; and a motor driver connected to the pattern selector and configured to drive the motor to rotate according to the reference waveform pattern or the modulated waveform pattern that is selected by the pattern selector.

2 . The system of claim 1 , wherein the reference waveform pattern includes a sinusoidal waveform pattern, a third harmonic waveform pattern, or a combination thereof.

3 . The system of claim 1 , wherein the modulated waveform pattern includes a trapezoidal waveform pattern, a square wave pattern, or a combination thereof.

4 . The system of claim 1 , wherein when the command detector determines that the rotating speed command does not reach a threshold, the command detector selects the reference waveform pattern; and
when the command detector determines that the rotating speed command reaches the threshold, the command detector selects the modulated waveform pattern.

5 . A method for driving a motor to rotate at a high speed, comprising the following steps:
providing a reference waveform pattern and a modulated waveform pattern by a lookup table module, wherein a waveform of the reference waveform pattern is different from a waveform of the modulated waveform pattern and an amplitude of the modulated waveform pattern is larger than an amplitude of the reference waveform pattern; receiving a rotating speed command by a command detector; selecting the reference waveform pattern or the modulated waveform pattern according to the rotating speed command by a pattern selector; and driving the motor to rotate, according to the reference waveform pattern or the modulated waveform pattern that is selected by the pattern selector, by a driver.

6 . The method of claim 5 , wherein the reference waveform pattern includes a sinusoidal waveform pattern, a third harmonic waveform pattern, or a combination thereof.

7 . The method of claim 5 , wherein the modulated waveform pattern includes a trapezoidal waveform pattern, a square wave pattern, or a combination thereof.

8 . The method of claim 5 , wherein the step of selecting the reference waveform pattern or the modulated waveform pattern further includes:
determining, by the command detector, whether or not the rotating speed command reaches a threshold, in response to determining that the rotating speed command does not reach a threshold, the command detector selects the reference waveform pattern, in response to determining that the rotating speed command reaches the threshold, the command detector selects the modulated waveform pattern.

Assignees

• Anpec Electronics Corp

Inventors

• Tsai Ming-Jung

Classifications

• H02P23/0086 Primary

  specially adapted for high speeds, e.g. above nominal speed · CPC title

• H02P23/04 Primary

  specially adapted for damping motor oscillations, e.g. for reducing hunting · CPC title

• H02P2209/13

  Different type of waveforms depending on the mode of operation · CPC title

• H02P27/02

  using supply voltage with constant frequency and variable amplitude · CPC title

• H02P27/085

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title