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This paper proposes a compensation method for precise position-sensorless control using high-frequency pulsating voltage injection and the criterion for applicability of the proposed compensation method is discussed. Theoretical background of the proposed 3-dimensional compensation table as well as the implementation method is described and it is disclosed that the real rotor position and the convergent...
This paper describes position-sensorless control method by modified Pulse Width Modulation (PWM). Sensorless control for low speed including zero-speed utilizes the magnetic saliency from the current variation. High frequency voltage injection type methods require high amplitude and high frequency voltage to improve control performance. The voltage injection results in the increase of audible sound...
This paper presents the torque estimation method for position sensorless drive of permanent magnet synchronous motors that is robust to motor parameter variation. The proposed method estimates torque by using sinusoidal components in instantaneous power variation caused by injecting the high frequency test signal to the current phase. The experimental results show that the consistency in estimated...
In this paper, a design methodology of IPMSM for absolute position sensorless drive is proposed. In conventional researches on the absolute position estimation, initial motion of the rotor was required, which was not allowed in many applications. To eliminate the initial motion, an IPMSM with eccentric rotor with search coils is devised. In the proposed design, the information of the absolute position...
In this paper, two designs of Interior Permanent Magnet Synchronous Machine (IPMSM) for sensorless drive with absolute rotor position estimation capability are proposed. A conventional IPMSM design prepared for the same purpose had a demerit that for absolute position estimation, saying that the rotor should initially stroke for 100° in the worst case. In order to reduce the initial stroke of the...
This paper introduces a new method of generator brake torque control during Fault Ride Through (FRT) drive for a multi level matrix converter of wind power system. It may be exist that a generator speed become over speed during FRT drive. In this case, a generator has to be fixed brake torque. In the past, generator brake torque control during FRT drive for a matrix converter is impossible. However,...
In this paper, a design and control method of Interior Permanent Magnet Synchronous Machines (IPMSMs), which is controlled in position sensorless mode based on high frequency signal injection, for absolute position detection and control capability has been addressed. Although conventional motor designs with symmetric structure work well in sensorless speed and torque control modes, their actual mechanical...
The PWM converter includes a low-pass filter in order to remove the high-frequency current that flows to the power grid. The low-pass filter is composed of two reactors and a capacitor (LCL-filter). The LCL-filter is the gain characteristic that attenuates by the high frequency band, and can eliminate the career ripple of the current. However, LCL-filter has a strong resonance characteristic. When...
This paper proposes a new method of position sensorless control for synchronous reluctance machine (SynRM). The position sensorless scheme is based on the instantaneous power optimization the feature of which takes a specific control axes on reactive and real power and realizes both rotor speed estimation and tracking to the point of the maximum torque per current. Adopting the signal injection onto...
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