Abstract:
The invention relates to a method for operating a synchronous machine by means of a three-phase AC power controller, which is connected to a three-phase network, comprising the following steps: determining the phase difference between the magnet-wheel voltage of the synchronous machine and the network voltage of the three-phase network; determining the rotational speed of the rotor of the synchronous machine; determining the phase position of the three-phase network; determining a decision characteristic number on the basis of a stored data table that has been calculated in advance, which data table associates a decision characteristic number with value triples of phase difference, phase position, and rotational speed; and determining at least one switching time point on the basis of the decision characteristic number.
Abstract:
The invention relates to a method for operating a brushless DC machine comprising at least one winding strand (3) to which a switching bridge (1) with at least two semi-conductor switches (4-7), respectively comprising a recovery diode which is connected in parallel, is associated. According to the invention, the semi-conductor switches (4-7) are controlled in a first operational area for forming an active free-wheeling circuit (16) and in a second operational area for forming a passive free-wheeling circuit (17). The invention also relates to a DC machine.
Abstract:
L'invention a pour objet un procédé et un dispositif de surveillance de l'usure de contacts électriques frottants (4) d'un collecteur de courant rotatif (3) équipant une machine électrique (1) génératrice de ce courant pour véhicule automobile. Ce procédé consiste à détecter (15) à partir de la machine électrique (1) en phase de génération de courant des données relatives au Rapport Cyclique d'Ouverture (RCO) induit par le courant généré. Les données relatives au RCO détecté sont comparées (15) avec une valeur de RCO de consigne prédéterminée, et un état d'usure des contacts électriques frottants (4) est déduit au regard d'un seuil d'usure toléré par incrémentation d'un compteur cadencé (18) à partir de ladite comparaison (15). Une information d'alerte est générée (23) dans le cas où l'état d'usure des contacts électriques frottants (4) atteint ledit seuil d'usure toléré. Cette information d'alerte est inhibée (24,25) à partir d'une détection d'une valeur qui tend à être nulle du compteur cadencé (18) après remplacement des contacts électriques frottants (4).
Abstract:
A controller for a brushless motor, the controller comprising an input for receiving an analogue signal, an analogue-to-digital converter (ADC) for sampling the analogue signal, and a processor. The processor starts the ADC during a first electrical half-cycle and reads the ADC during a second electrical half-cycle of the motor. Additionally, a motor system comprising the controller.
Abstract:
A controller for an AC electric motor, includes a Feed Forward Torque Controller and a load model. The Torque controller directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter. The load model derives a motor speed value including a model of motor speed behaviour of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor. This motor speed output signal is used in determining a frequency of rotation of an applied motor voltage vector. Where an input to the load model is the signal representing the torque command input T*, the load model uses the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal.
Abstract:
Ein Linearantrieb für ein elektrisch verstellbares Möbel umfasst einen bürstenlosen Gleichstrommotor (BLDC), der eingerichtet ist, eine lineare Bewegung des Linearantriebs zu bewirken, sowie eine Steuerungseinrichtung (CTL) zur Steuerung des Motors (BLDC).
Abstract:
Verfahren und Vorrichtung zur Überwachung des Betreibens einer Synchronmaschine Bei einem Verfahren und einer Vorrichtung zur Überwachung des Betreibens einer Synchronmaschine (1,1') mit einem eine bestromte Ständerwicklung zur Erzeugung eines Ständerfeldes aufweisenden Ständer (3,3') und mit einem Magnetpole bildenden Läufer (2,2'), wird aus einer Abweichung der Richtung der Beschleunigung des Läufers (2,2') und der Richtung des betriebsbedingt erzeugten Drehmomentes (M) bzw. der Kraft (F) auf einen Mittkopplungs-Zustand erkannt.
Abstract:
A power tool having an electronically commutated DC motor capable of providing various operating modes ranging from a maximum efficiency operating mode to a maximum power operating mode. The motor has a rotor having permanent magnets mounted in recesses in a back iron of the rotor. In one embodiment the motor has three phase windings, each having at least a pair of coils. The phase windings are connected in either a delta or a wye configuration via electromechancial or electronic switching components, or a combination of both, by a controller within the tool. The coils in each phase winding can also be switched between series and parallel configurations to configure the motor to provide its various operating modes. In one embodiment a dual wound moto is disclosed that has its phase coils dynamically or statically switchable between series and parallel configurations.