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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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To Start with Sine-Wave Drive

To Start with Sine-Wave Drive

The brushless motor is a synchronous motor, which means that the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles.
It is not possible to start the motor using a sine-wave drive, because the stopped rotor does not follow the frequency when starting.
Therefore, when starting the motor, the acceleration operation is required by feeding back the rotor position.

  • (1) Detect the rotor position.
  • (2) Apply a sinusoidal voltage slowly to the coil according to the rotor position.
  • (3) Rotate while gradually increasing the voltage.
  • (4) Control the period of the sine-wave according to the timing of the position detection sensor.
  • (5) If the rotor rotates with a certain speed, steady operation starts to reach the target speed.

In steady operation, the speed can be maintained against load fluctuations by feeding back the target speed deviation.

*Synchronous motor may be able to start if there is no load.

Chapter 4 Let's Try to Rotate the Motor

Configuration of Square-Wave Drive
To Start with Square-Wave Drive
To Rotate by Square-Wave Drive
Configuration of Sine-Wave Drive
To Rotate by Sine-Wave Drive
To Change Speed
Speed ​​Sequence
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