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This paper deals with an amplitude adjusting method for a signal injection in position sensorless controls of IPMSM (Interior Permanent Magnet Synchronous Motor) drives. Signal injection is necessary for position estimation at standstill and low speeds. Response signals to the injected signals have position information caused by a saliency of the IPMSMs. The position information appears in inductances...
The vibration suppression on a resonant system, based on the reflected wave rejection, has been recently proposed. In the method, the resonant system is modeled through a wave equation, in order to consider high order vibrations and vibration suppression is achieved by eliminating a reflected wave from the resonant system. However, it is impossible to implement such method when there are input and...
This paper presents a new start-up method from standstill to a sensorless control for surface permanent magnet synchronous motor (SPMSM). To estimate the rotor position of SPMSM from the measured induced voltage, a DC current adds to the motor and nonlinear observer is introduced to the motor torque equation while the motor is vibrating. To achieve the start-up smoothly, first order induced voltage...
This paper proposes a method for suppressing the speed vibration caused by the angular transmission error in the cycloid gear used in industrial robots. It is important for industrial robots to have high accuracy. The arms of robot, however, are caused to vibrate by cycloid gears that have an angular transmission error. The proposed method for compensating for the speed vibration uses a new extended...
New design and control of a robotic cane have been proposed in this paper. Our robotic cane has been designed so that it moves according to user's small force applied to the cane and it stably supports the user when large force is applied by the user. We confirmed our control and estimation of human force method in 2D and 3D simulation. In this paper, an overview of the design and a robust control...
Sensorless vector control of an interior permanent magnet synchronous motor (IPMSM) has been studied in many papers. The extended electromotive force (EMF) based method is one of the representative systems. We proposed a simplified method which estimates the rotor position using the controlled voltage without using observer. In this paper we have compared these methods through trajectories of poles...
SRMs, switched reluctance motors, are being expected as an excellent candidate for power sources in harsh environments due to the simple structure. In spite of many methods proposed to eliminate the rotor position sensor, which is needed to commutate the current correctly but not compatible with harsh environments, no successful sensor-less method has been seen so far. The method proposed in this...
In this paper, a novel adaptive reduced-order observer is proposed for the position-sensorless drive of doubly-fed induction machines. The reduced-order observer is conducted by the reduced-order model expressed on the holonomic reference frame; the stator equation on stator reference frame. The proposed rotor-position estimation scheme is straightforward and simplicity for implementation without...
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