| 摘要 |
The object of the present invention is to provide an apparatus for controlling a vibration motor to operate continuously in the maximum resonance point by estimating a resonance point despite changes in the various environmental conditions where the vibration motor is installed and used. The apparatus checks the phase information from the reverse electromotive force voltage of the vibration motor to compensate for an input command for controlling the vibration motor, so the vibration motor is able to operate continuously in an optimal state. In addition, the invention provides a control method of the vibration motor which detects the phase of a vibration of the vibration motor from the current variation caused by the inductance variation of the vibration and compensates the input command according to the detected phase. Therefore, the invention is part of the miniaturization trend through the reduction of cost and volume by eliminating the necessity of additional hardware, that is, the sensor for detecting the phase of the vibration of the vibration motor. The invention also allows control of the vibration motor in a vibration frequency range so that the motor may operate in an accurate resonance frequency. Furthermore, the invention provides the apparatus that has a certain frequency offset from the resonance frequency to control the vibration motor with various frequencies, operating points and amplitudes. |
