Method and arrangement for controlling an induction motor

Details Method and arrangement for controlling an induction motor Method and arrangement for controlling an induction motor

H - Electricity

02

M

H02M 7/5387 (2006.01) H02P 7/44 (1995.01) H02M 7/48 (2006.01)

Patent

CA 2161554

A device for controlling a three-phase induction motor that is driven by an inverter connection. The inverter is furnished to be fed with full-wave rectified grid alternating voltage (U) and supply the motor's various phases (R, S, T) with the drive voltages phase-displaced in the normal way and which consist of mainly square, in relation to a virtual zero reference level, positive and negative half-periods which alternate at a fixed or adjustable drive frequency corresponding to the required speed. The full-wave rectified grid alternating voltage (U) supplied to the inverter is arranged to be supplied to respective motor phase (R, S, T) via an electronic switch connection (TR1H, TR1L; TR2H, TR2L; TR3H, TR3L) whose respective on and off periods are determined by the drive frequency which is generated by an oscillator device (15; 25). The last mentioned is arranged to be supplied with a voltage (Um) which directly or indirectly represents the rectified grid alternating voltage (U) for the purpose of modulating the drive frequency with a signal that represents the variations in amplitude of the rectified grid alternating voltage. The invention also comprises a method of controlling an induction motor of the type specified.

Dispositif de régulation d'un moteur asynchrone triphasé piloté par onduleur. Ce dernier, alimenté par une tension alternative de grille redressée pleine onde (U), fournit aux trois phases du moteur (R, S, T) des tensions pilotes à déphasage normal consistant en demi-périodes positives et négatives sensiblement rectangulaires par rapport à un niveau virtuel de référence zéro et qui alternent selon une fréquence pilote fixe ou variable correspondant à la vitesse désirée. La tension alternative de grille pleine onde (U) redressée qui alimente l'onduleur parvient aux différentes phases (R, S, T) du moteur par l'intermédiaire d'une commutation électronique (TR¿1H?, TR¿1L?; TR¿2H?, TR¿2L?; TR¿3H?, TR¿3L?) dont les périodes positives et négatives respectives sont déterminées par la fréquence pilote d'un oscillateur (15, 25). Ce dernier, alimenté sous une tension (U¿m?) qui représente directement ou indirectement la tension de grille alternative rectifiée (U), a pour fonction de moduler la fréquence de pilotage à l'aide d'un signal représentant les variations d'amplitude de la tension alternative de grille rectifiée. L'invention porte également sur un procédé de régulation d'un moteur asynchrone du type indiqué.

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