| 摘要 |
An electrical shock absorber 20 of the present embodiment includes a motor 21, which is rotated by approaching and separating motions between sprung and unsprung members which approach and separate from each other; and an electric circuit 50, which connects the electric terminals of the motor 21 so as to cause current to flow through the motor 21. The electric circuit 50 includes P-channel JFETs 56, 60. The gate of the P-channel JFET 56, 60 is connected to one electric terminal of the motor 21, and the source of the P-channel JFET 56, 60 is connected to the other electric terminal of the motor 21. Therefore, the induced voltage is applied to the gate. The induced voltage represents the stroke speed of the electrical shock absorber 20. Therefore, the gate voltage VGS is changed on the basis of the above-mentioned relative speed such that the gate voltage VGS increases with the stroke speed of the electrical shock absorber 20. By means of changing the gate voltage VGS in this manner, the magnitude of the induced current flowing through the electric circuit 50 is limited by the P-channel JFETs 56, 60 on the basis of the characteristic of the P-channel JFET 56, 60 in terms of change of drain-source current iDS with the gate voltage VGS. |
