| 摘要 |
PURPOSE:To prevent the resonance phenomenon by detecting in advance the prescribed output frequency of an inverter resonated with the operating noise of a motor when the motor is operated and applying the detection signal as a control element of the inverter. CONSTITUTION:An inverter A controls a motor M with the output frequency preset in advance in response to the input signal level. Switch group SW has function as a memory for setting in advance the prescribed output frequency of the inverter A resonated with the operating noise when the motor M is operated as prescribed. Thus, the relationship between the input power source V1, the output frequency and the resonance noise of the motor M is detected in advance and set so as not to produce resonance noise by set switch group SW. |
