Antti Piippo

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This paper deals with a speed and position estimation method for the sensorless control of permanent magnet synchronous motors. The method is based on a speed-adaptive observer. The dynamics of the system are analyzed by linearizing both the motor model and the observer, and the observer gain is selected to give improved damping and noise suppression. At(More)
This paper presents a method for the rotor speed and position estimation of permanent magnet synchronous motors in a wide speed range including standstill. The proposed method is based on a modified voltage model at high speeds, and combines the modified voltage model with a high-frequency signal injection technique at low speeds. The fast dynamic response(More)
The paper presents a sensorless vector control method for a permanent magnet synchronous motor when the output voltage of the PWM inverter is filtered by an LC filter. The dynamics of the LC filter are taken into account in the design of the controller and adaptive full-order observer. The use of the output filter does not require additional current or(More)
The paper presents a speed and position estimation method for the sensorless control of permanent magnet synchronous motors. The method is based on a speed-adaptive flux observer that is augmented with a high-frequency signal injection technique at low speeds and standstill. In the adaptive observer, a flux model is used as the reference model and a voltage(More)
This paper proposes an online method for the estimation of the stator resistance and the permanent-magnet (PM) flux in sensorless PM synchronous motor drives. An adaptive observer augmented with a high-frequency signal injection technique is used for sensorless control. The observer contains excess information that is not used for the speed and position(More)
This paper proposes a hybrid observer for sensorless control of permanent-magnet synchronous motor drives equipped with an inverter output <i>LC</i> filter. An adaptive full-order observer is augmented with a high-frequency signal injection method at low speeds. The only measured quantities are the inverter phase currents and the dc-link voltage. The(More)
OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P. O. BOX 1000, FI-02015 TKK http://www.tkk.fi Author Antti Piippo Name of the dissertation Manuscript submitted 12.11.2007 Manuscript revised 01.04.2008 Date of the defence 30.05.2008 Article dissertation (summary + original articles) Monograph Faculty Department Field of research Opponent(s)(More)
The paper proposes a method for the compensation of the torque ripple that is caused by motor unidealities in sensorless permanent magnet synchronous motor drives. The sensorless control of the interior-magnet motor is based on a speedadaptive observer augmented with a pulsating high-frequency signal injection technique at low speeds. The harmonics in the(More)
The paper proposes a method for the rotor speed and position estimation of permanent magnet synchronous motors, applicable in a wide speed range including standstill. A modified voltage model is used at high speeds, and it is combined with a high-frequency signal injection technique at low speeds. The fast dynamic response of the voltage model is thus(More)
The paper proposes a motion-sensorless control method for permanent magnet synchronous motor drives when only the DC-link current is measured instead of the motor phase currents. A two-phase pulse-width modulation method is used, allowing the DC-link current to be sampled twice in a switching period at uniform intervals during active voltage vectors. A(More)
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