Method and apparatus for control of a switched reluctance motor

H - Electricity – 02 – P

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H02P 6/16 (2006.01) H02P 6/08 (2006.01) H02P 6/18 (2006.01) H02P 25/08 (2006.01)

Patent

CA 2205588

A method for estimating and controlling the rotor position of a SR motor comprises the steps of sampling phase current(s) (53) and estimating phase flux(es) (54) from at least one conducting phase of the SR motor, sampling phase current(s) (52) and estimating phase inductance(s) (54) from at least one unexcited phase of the SR motor, and determining the rotor position (55) by combining the estimated phase flux and the estimated phase inductance (54). Once the rotor position has been determined/estimated by the above method, the position of the rotor can be controlled so as to provide, overall, and effective control of the SR motor. In particular, once the position of the rotor is determined/estimated, the excitation provided to the motor is then adjusted (56) to urge the rotor from its current position towards its desired position. In this way, position control of the motor can be obtained. Of course, this can be extended to obtain velocity control as well.

L'invention concerne un procédé pour évaluer et commander la position du rotor d'un moteur SRM qui consiste à échantillonner le ou les courants (53) des phases, à estimer le ou les flux (54) des phases depuis au moins une phase conductrice du moteur SRM, à échantillonner le ou les courants (52) des phases et à estimer la ou les inductances (54) des phases d'au moins une phase non excitée du moteur SRM et à déterminer la position (55) du rotor en combinant le flux de phase estimé et l'inductance (54) de phase estimée. Lorsque la position du rotor a été déterminée/estimée par le procédé ci-dessus, la position du rotor peut être commandée pour assurer une commande globale efficace du moteur SRM. En particulier, une fois que la position du rotor est déterminée/estimée, l'excitation fournie au moteur est alors ajustée (56) pour amener le rotor de sa position initiale vers sa position souhaitée. De cette manière, on peut assurer une commande de la position du moteur. Naturellement, cette commande peut également être étendue à celle de la vitesse.

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