Beschrieben ist ein Verfahren zum Betrieb einer elektrischen Asynchronmaschine. Das Verfahren umfasst, die elektrische Asynchronmaschine in einem Arbeitspunkt zu betreiben, bei dem an die Statorwicklung eine Wechselspannung mit einer ersten Stator-Spannungsamplitude und einer ersten Statorfrequenz angelegt wird, wobei ein Stator-Wechselstrom mit einer Stator-Stromamplitude fliesst. Der Rotor dreht sich mit einer Rotordrehzahl und an einer Abtriebswelle der Asynchronmaschine wird ein Drehmoment erzeugt. Im Arbeitspunkt wirkt dem an der Abtriebswelle erzeugten Drehmoment ein Lastmoment entgegen, welches dem erzeugtenDrehmoment entspricht. Das Verfahren umfasst weiterhin, zu bestimmen, ob ein Lastverlust-Zustand vorliegt, in dem der Betrag des Lastmoments kleiner ist als der Betrag des erzeugten Drehmoments an der Abtriebswelle. In einem Lastverlust-Zustand wird die Statorfrequenz gleichsinnig mit der Rotordrehzahl unabhängig von der Amplitude der Statorspannung verändert.

A configurable motor system includes a housing having an electrical power input and an interface receptacle, an electric motor received in the housing, an output shaft rotationally driven by the electric motor, a motor control circuit received in the housing and configured to control power delivery from the electrical power input to the electric motor and a modular interface in communication with the motor control circuit through the interface receptacle. The modular interface is configured to receive one or more user inputs and to direct the motor control circuit to control power delivery to the electric motor based on the user input and based on pre-programmed instructions corresponding to a tool to which the motor system is attached.

The resonant motor system of the present invention has a resonant motor having a resonant circuit consisting of magnetic coils and of capacitors, for generating an electric power when the resonant motor is rotated by an engine, a regenerating portion for the resonant motor, a motor driving portion, a motor control portion, and a capacitor portion for storing therein the electric power generated by the resonant motor when the resonant motor is regenerated, characterized in that the resonant motor is driven by the electric power stored in the capacitor portion when the engine is assisted by the resonant motor.

Systems comprising an input device(135) configured to output a variable control signal, a controller (10) configured to receive the variable control signal and derive a torque command in accordance with the variable control signal, and a freight conveying device (30) comprising a motor (40) configured to receive the torque command and produce an output torque on a motor shaft in accordance with the torque command are disclosed. Also methods comprising receiving, at a controller, a variable control signal from an input device, deriving, by the controller, a torque command in accordance with the variable control signal, and driving, by the controller, a motor of a freight conveying device in accordance with the torque command are disclosed.

A motor control system includes a plurality of motors, a plurality of inverters, and a controller. The plurality of inverters are configured to drive the plurality of respective motors and are coupled to a common bus line through which DC power is supplied. When power supply is interrupted, the controller is configured to calculate a frequency command value so as to maintain a bus line voltage across the common bus line and configured to supply the frequency command value to the plurality of inverters.

A motor control system includes a plurality of motors, a plurality of inverters, and a controller. The plurality of inverters are configured to drive the plurality of respective motors and are coupled to a common bus line through which DC power is supplied. When power supply is interrupted, the controller is configured to calculate a frequency command value so as to maintain a bus line voltage across the common bus line and configured to supply the frequency command value to the plurality of inverters.

[PROBLEM]

The invention provides a unidirectionally-energized brushless DC motor including an AC voltage output winding, and the brushless DC motor simultaneously exerts a motor function of being able to continuously obtain a constant torque and a power generation function of being able to obtain a continuous electromotive force.

[SOLVING MEANS]

The brushless DC motor includes a disk 5 that is attached to a frame 3, a plurality of plate-like permanent magnets 6 that are disposed on the disk 5 at equal intervals around the disk 5, magnetic cores 70 (A) that are fixed to the frame 3 according to the plurality of permanent magnets 6, windings 71(A) each of which is wound around the magnetic core 70(A) and to which DC power is supplied, a predetermined number of magnetic cores 70(B) that are fixed to the frame 3, and windings 71(B) each of which is wound around the magnetic core 70(B) and connected to a power consumption device. The permanent magnets 6 are located such that an angle formed by a straight line passing through the center of the disk 5 and the center of the permanent magnet 6 and a normal line in the center of a magnetic pole plane of the permanent magnet 6 ranges from 0° to 60°.