摘要:
A stator arrangement particularly suitable for use in an air-cooled generator or other such electric machine includes a stator with an outer stator surface, an opening therein defining an inner stator surface, and longitudinally opposed stator end surfaces. Conductive coils are supported by the stator, and include end turns overlying the longitudinally opposed stator end surfaces. In order to block out environmental contaminants and prevent conductive coil shorting, protective barriers are mounted over the end turns and secured to the stator.
摘要:
A rotor includes a rotor core formed of webs defining a layout of the magnets in the rotor core. The rotor core has at least one layer of magnets forming a plurality of poles. Each pole includes a plurality of slots for holding a magnet, at least two ribs comprising web portions between the centerline slot and each wing slot, and a plurality of magnets arranged in corresponding slots. The slots have at least a centerline slot and two angled wing slots extending from a position at or around respective ends of the centerline slot towards an outer circumference of the rotor core. The wing slots may taper from a position at or around respective ends of the centerline slot towards an outer circumference of the rotor core.
摘要:
The invention relates to a method for determining the electric angular speed of a rotor of an induction motor, wherein electric power supplied to phases of a stator of the induction motor affects the rotor, comprising the steps of: switching off the electric power supply to the phases of the stator during a particular period of time, picking-up signals corresponding to voltages at the stator phases within the particular period of time, and determining the electric angular speed of the rotor based on the picked-up signals.
摘要:
The invention refers to a computer-implemented method for determining a parameter of a field-oriented control, FOC, model for an electric power unit, the electric power unit comprising a three-phase electric motor and an inverter drive for driving the electric motor, the method comprising the steps of: sending a control signal to the inverter drive; applying a predefined electric voltage to at least two of the phases of the electric motor by the inverter drive in response to the control signal; measuring an electric current that flows in the at least two phases of the electric motor in response to the applied electric voltage; and determining the parameter of the control model for the electric power unit using a value of the applied predefined electric voltage and a value of the measured electric current. Further, a corresponding apparatus for determining a parameter of a control model for an electric power unit is provided. The accuracy of the parameters determined by the method according to the invention is based on the precision of the applied voltages and for this reason it is necessary to foresee a hardware and software function to obtain this precision.
摘要:
The invention deals with the field of connecting devices for connecting between printed circuits and power cables connected to an electric apparatus. The device provides for an electrically conducting metal cage (4) composed of a disk (4a) from which pins (4b) fall that are inserted into holes obtained in the printed circuits to be coupled with the printed circuits themselves. The cage is equipped with a hole for passing a screw (6) stem.
摘要:
The present invention relates to a method of feeding asynchronous motors (1) with inverter (2), of the type comprising a driver (3) of the inverter and feedback (4) of the voltages at the terminals of the asynchronous motor. The abovementioned method measures (5) the duty cycle of the voltages at the terminals, compares it (6) with reference values (7), calculating the errors (8) between actual duty cycle and ideal duty cycle, in order to obtain, by means of further application of a PI control algorithm (10), compensation (9) of the driver (3), eliminating the distortions introduced by the inverter itself.
摘要:
This invention relates to sensorless control (i.e. without encoder at the motor shaft) of an induction motor (AC asynchronous motor). In particular, the invention comprises a method for a direct measurement of the electromotive forces (EMF) at the stator of the motor to allow for the regulation of the speed of the motor in a wide range, including the very low frequency range. The method provides the accurate measurement of the EMF at the stator in such a way that the direct control of an induction motor will get simpler, in terms of less calculation and, overall, in terms of accuracy and consistancy of the results, thanks to the availability of a direct measurement of the EMF instead of a bare estimation thereof. To enable the direct measurement, the employment of at least two sensor windings (sensor coils) is needed each one mutually coupled with the stator phase of the motor.