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Most Anisotropy based sensorless control schemes are using an additional voltage injection in order to create a measurable current ripple. This injection causes some unwanted side effects such as additional noise and torque oscillations, introduced by the harmonics of the current. This paper proposes an operating point dependent injection in combination with an arbitrary injection scheme in order...
This paper presents an anisotropy-based position estimation approach taking advantage of saturation effects in permanent magnet synchronous machines (PMSM). Due to magnetic anisotropies of the electrical machine, current responses to high-frequency voltage excitations contain rotor position information. Therefore, the rotor position can be estimated by means of these current responses. The relation...
For the torque control of interior permanent magnet synchronous machines (IPMSMs), it is necessary to set a pair of reference currents based on the reference torque. At base speed the reference currents should be chosen in a way on which total current is minimized. This strategy provides copper-loss minimization and is known as Maximum Torque per Ampere (MTPA). Current methods present various disadvantages,...
This paper proposes a sensorless control scheme for a surface-mounted permanent-magnet synchronous machine (PMSM) based on the back-electromotive force voltage. It is a direct estimation method, meaning the rotor position is directly calculated based on stator-current measurements and the stator voltage commands as well as on the knowledge of stator resistance and stator inductance, but without the...
This paper proposes an angular position and speed estimation scheme that is based on a direct evaluation of the angle of the voltage induced by the spinning rotor (back-EMF) of a permanent-magnet synchronous motor (PMSM). It is an inverse parallel-model estimation method, meaning the rotor position and speed are directly calculated based on stator current measurements and the stator voltage commands...
In this paper a saliency based sensorless control method is proposed that does not rely on a certain form of injection. The underlying idea is that the saliency angle information can be obtained by comparing the real machine behavior with an isotropic machine model. The difference between the measured currents and the calculated model currents then provides the information of the rotor position. Moreover...
A rotor position estimator for a synchronous reluctance machine (SynRM) is presented. The rotor position is formulated in polar stator-current coordinates and is directly calculated based on stator current measurements and voltage commands. Only two machine parameters are required, stator resistance and average inductance. The scheme is easy to implement and has good dynamical and load rejection characteristics...
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