A method of a control system 2200 controls an inductance motor in a blower including an impeller and volute using a pressure compensation control system. The control system may be implemented in a respiratory pressure therapy device. The control system may include a sensor configured to provide a pressure signal indicative of the pressure of a flow of fluid produced by the blower. A measured pressure may be compared to a set pressure to determine a pressure error. A slip frequency may be adjusted as a function of the pressure error in an attempt to eliminate or minimize the pressure error.一種使用壓力補償控制系統以控制在含有一葉輪與螺旋形殼體的鼓氣機中的感應馬達之控制系統(2200)的方法。該控制系統可實施在呼吸壓力治療裝置。該控制系統可包括一感測器，該感測器構成提供表示由該鼓氣機所產生流體流動壓力之一壓力信號。一測得壓力可與一設定壓力相比較以決定壓力誤差。一轉差頻率可依該壓力誤差的函數進行調整，以嘗試消除或減少該壓力誤差。
