摘要:
A multi phase brushless d.c. motor comprises a permanent-magnet rotor (1) and a stator (2) with stator coils (16, ..., 21) arranged between three power lines (A, B, C). For the purpose of commutation the motor is provided with switching devices (22A, 22B, 22C) for the cyclic disconnection and connection of the power-supply lines (A, B, C) of the motor to a d.c. power source (25). Each switching device (22) comprises a section (42) which is controlled by the rotor-magnet field for deriving the disconnection instants and a section (43) for deriving the connection instants from the voltage change which is produced on the power-supply line connected to the switching device as a result of another power-supply line being disconnected.
摘要:
La présente invention concerne un procédé pour alimenter un moteur polyphasé au moyen d'une pluralité d'enroulements (E1, E2, E3), chacun étant destiné à être excité au moyen d'un signal de commande (I1, I2, I3). Le procédé selon l'invention inclut les étapes suivantes :
. identification de celui des signaux de commande qui a la plus grande valeur absolue, et . connexion à une borne de référence de potentiel (VCC ou GND) de l'enroulement correspondant.
L'invention permet de réduire les pertes dues aux commutations dans les étages de puissance alimentant les enroulements, et d'augmenter le rendement du dispositif d'alimentation du moteur. Application : Commande de moteurs de disques durs.
摘要:
A motor is self-starting using only one magneto-sensitive element because the motor is of a two-phase type and is provided with a detection device which detects towards which of the two phases the rotor is mainly directed. A presetting circuit compares the detected rotor position with the state of an energizing circuit in order to set this circuit so that the energizing circuit energizes the stator phases for said specific rotor position in such a way that starting of the motor is guaranteed, although initially with an undefined direction of rotation. By presetting the commutating direction of the energizing circuit the rotor subsequently locks the field which rotates in the correct direction if it has started in the incorrect direction.