Abstract: This paper proposes a control method for a doubly-fed induction generator (DFIG) that detects the rotor current and controls the rotor voltage to be in phase or out of phase with the rotor current. By detecting the rotor current and controlling the rotor voltage to be in phase or out of phase with the rotor current, the power factor on the rotor side is controlled to be 1, reducing the capacity of the frequency converter on the rotor side and lowering the system cost. This paper analyzes, simulates, and experiments this scheme. Keywords: Doubly fed induction motor, vector control, motor control, speed regulation simulation Abstract: This article proposes a theoretically unique control method for a planar motor. By examining the rotor-side electric current and controlling the rotor voltage and its synchronization or opposition, the power factor of the rotor can be controlled. This reduces the frequency converter capacity of the rotor and lowers the system cost. This paper presents the analysis of this planar motor, its simulation, and the experiment. Keywords: Planar motor, vector control, electrical machinery control, velocity modulation, simulation 0 Introduction In the past decade, with the development of power electronics, microelectronics, and modern control theory, AC motor speed regulation has developed rapidly in the field of electrical drives. For some high-voltage, high-power applications with a small speed range, a wound-rotor asynchronous motor doubly fed control system is commonly used. This system offers high reliability and low cost. Furthermore, due to the fast dynamic response, low harmonic pollution, and high-efficiency energy-saving power factor regulation characteristics of doubly-fed motor vector control systems, their application prospects are very broad. This paper presents a simple sensorless control scheme for doubly-fed motors. By detecting the rotor current, the rotor voltage is controlled to be in phase or out of phase with the rotor current, thereby controlling the rotor-side power factor to be 1, reducing the capacity of the rotor-side frequency converter, and lowering the system cost. For details, please click: A Novel Vector Control Method for Doubly-Fed Motors