| 摘要 |
PURPOSE:To avoid the burning accident of a brushless motor, etc. by a method wherein a means which outputs an electric signal related to the temperature of the brushless motor is provided and the frequency of a control pulse is determined in accordance with the electric signal. CONSTITUTION:A setting part 3 fro setting the rotational speed of a brushless motor 2 and a temperature detecting part 4 for detecting the temperature of the motor 2 are provided. The motor 2 is driven in respond to a control pulse signal PS having a duty ratio corresponding to the rotational speed set by the setting part 3. Further, the temperature detecting part 4 outputs an electric signal S2 related to the temperature of thermotor 2 and the frequency of the pulse signal PS is determined in accordance with the electric signal S2. Therefore, the number of rises and drops of rises and drops of the pulse signal PS in a unit time can be adjusted and the temperature rise of the motor 2 can be suppressed. With this constitution, the motor 2 can be operated while the overheat of the motor 2 is efficiently suppressed and the burning accident of the motor 2 can be avoided. |
