本研究設計一組線型電動機,應用於可調阻尼式懸吊系統中,藉以提升車輛行駛時舒適度及操控性。可調阻尼件大致上有液壓式及電動式兩種。液壓式之缺點為系統時間常數較長,而電動式之缺點是需要額外電源驅動。本研究利用磁生電之原理,設計出一組不需要外加額外電源驅動之可調阻尼器。驅動線型電動機的電源是利用車輛行駛中之振動所產生反電動勢提供。本研究之懸吊阻尼常數控制策略為依據LQR(Linear Quadratic Regulator)控制方式達成,再利用PWM訊號方式來控制馬達電流,進而達成控制器之要求。最後利用頻率響應來分析傳統式懸吊系統與可調阻尼式懸吊系統之優缺點。
This research aims on the design of a linear motor as an adjustable damper for semi-active suspension systems to improve ride comfort and to increase the handling stability for vehicle in driving. The adjustable damper can be classified as hydraulic type and electric type. The drawback of the hydraulic type is that system time constant is longer. The drawback of the electric type is that extra power is needed. This paper uses the principle to transform magnetic field into electricity to design an adjustable damper which needs no extra power. The power of the linear motor as an adjustable damper is provided by back-electromotive force which is produced by vehicle vibration in driving. The adjust strategy of damper constant in suspension system is based on Linear Quadratic Regulator. PWM control is used to make motor current achieve controller request. Finally, frequency response is analyzed to investigate advantage and disadvantage between the traditional suspension system and the semi-active suspension system.