摘要:
A control strategy for an electric motor of an electric power assisted steering system of the kind in which a control means produces motor current demand signals that are fed to a motor drive means, the demand signals being dependent on the amount of assistance torque demanded from the motor, the motor drive means being arranged to cause currents to flow in each phase of the motor as required to meet the demanded assistance torque, the control strategy comprising limiting the rate of change of current that is drawn from the electrical supply of the vehicle by the motor in the event that it would otherwise exceed a threshold rate of change.
摘要:
The present invention relates to an electric saw (1) being powered by an external power supply (200) through a multicore cable. The multicore cable includes electrical wires (24, 25, 27) for supplying power to the motors (5, 12, 13) of the electric saw (1) and communication wires (26) for data communication between the electric saw (1) and the power supply (200). Two motors (12, 13) of the electric saw are three phase permanent magnet motors (12, 13), with an outer rotor and an inner stator. Each of the two motors (12, 13) has three Hall Effect sensors (H1, H2, H3) located around the outer rotor. In particular the invention relates to a method of controlling the saw (1) comprising the steps: a) monitoring the electrical position and/or electrical positional changes of the second and/or third motor (12, 13); and b) transmitting it to the external power supply (200); and c) delivering a three phase commuted voltage to the second and/or third motor (12, 13). Further the invention relates to a communication protocol for serial communication between the saw (1) and the external power supply (200).
摘要:
A novel multiple induction electric motor and vehicle that stores electrical power; provides a first and second direct current power input from the stored electrical power; separately produces first and second synchronized variable frequency alternating current control signal from the first and second direct current power inputs, respectively; produces first and second synchronized rotating magnetic fields responsive to the first and second variable frequency alternating current control signals, respectively; induces a first induced magnetic field around a conductor in a first inductive rotor responsive to the first rotating magnetic field; induces a second induced magnetic field around a conductor in a second inductive rotor responsive to the second rotating magnetic field; applies first and second rotational forces between the first and second rotating magnetic fields and the first and second induced magnetic fields to the shaft; and transmits the first and second rotational forces to a drive wheel.
摘要:
An object is to provide a multiple-type air conditioner, which can operate regardless of variations in input voltage, and can achieve commonality of parts. Also, another object is to improve an air-conditioning efficiency for reducing a required energy. For achieving these objects, the multiple-type air conditioner, in which a plurality of indoor units are connected to an outdoor unit, includes a DC power supply 31 provided with an active filter, first, second and third motors 21a (compressor 21), 15 and 16 (outdoor fans) formed of DC motors, and an outdoor fan including hollow thick blades.
摘要:
Es wird ein Verfahren zum Kompensieren von unterschiedlichen Drehmomenten zweier Elektromotoren vorgeschlagen, wobei jeweils ein Elektromotor in einem Antrieb angeordnet ist, wobei die Antriebe gekoppelt in einer Antriebsvorrichtung angeordnet sind, wobei jeder Elektromotor mit einem Geschwindigkeitsregelkreis auf eine identische Drehmomentabgabe geregelt wird, mit folgenden Verfahrensschritten: a) Ermitteln von Ist-Strömen in beiden Elektromotoren, b) Ermitteln eines Korrekturfaktors aus den Ist-Strömen, der ein Verhalten von Drehmomentkonstanten der Elektromotoren beschreibt, und c) Einstellen von im Wesentlichen gleich großen Kreisverstärkungen in den Geschwindigkeitsregelkreisen der beiden Antriebe unter Verwendung des Korrekturfaktors. Weiterhin wird eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens vorgeschlagen.
摘要:
Es handelt sich um ein Verfahren zum Steuern des Synchronlaufs einer Mehrzahl von elektronisch kommutierten Motoren (22, 24, 26), welche jeweils einen Stator mit einer Statorwicklung (40, 42, 44), einen permanentmagnetischen Rotor (28, 30, 32) und mindestens einen dem Motor zugeordnete Anordnung (34, 36, 38), zum Erzeugen eines Rotorstellungssignals (H1, H2, H3) aufweisen. Ferner ist eine Bestromungsanordnung (46) vorgesehen, an welche die Statorwicklungen (40, 42, 44) der Motoren angeschlossen sind. Bei dem Verfahren laufen folgende Schritte ab: Die Rotorstellungssignale (H1, H2, H3) werden bei laufenden Motoren (22, 24, 26) fortlaufend analysiert. Wenn die Analyse ergeben hat, dass alle Rotoren eine vorgegebene Rotorstellung durchlaufen haben, wird der Strom in allen Statorwicklungen (40, 42, 44) gleichzeitig kommutiert. Auf diese Weise wird mit einfachen Mitteln bei einer Mehrzahl von Motoren (22, 24, 26) ein Synchronlauf erreicht.
摘要:
A synchronous reluctance motor control device includes current correction/calculation means (16) for generating a torque current instruction value following the load torque so that the output torque of the synchronous reluctance motor is always matched with the load torque. The control device may further include position/speed estimation/calculation means (13) for estimating position/speed based on the three-phase voltage equation in order to improve the control performance during voltage saturation.
摘要:
A controller (10) for a motor (12) is provided. The motor (12) includes N redundant M-phase rotor/stator combinations (16) (where N and M are both integers greater than 1). The controller (10) includes N driver circuits (5) each having M outputs. Each of the M outputs of a respective one of the N driver circuits provides pulse-width modulated (PWM) current pulses to a corresponding phase winding in a respective one of the redundant M-phase rotor/stator combinations (16). Furthermore, the controller (10) includes a control unit (6) operatively coupled to the N driver circuits (5) for providing phase spacing between the N driver circuits (15). As a result, current pulses provided by the N driver circuits (5) to a same phase winding in each of the redundant M-phase rotor/stator combinations (16) are offset in phase.