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Rotor-for-a-synchronous-reluctance-machine

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Rotor for a synchronous reluctance machine

Details

Inventors: El-Antably, Ahmed Mostafa; Erfanfar, Moshen M.; Martin, Ronald Allen;
Assignee: General Motors Corporation (Detroit, MN)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Mullins; Burton
Attorney, Agent or Firm: Dobrowitsky; Margaret A.

A rotor assembly for a synchronous reluctance machine has a plurality of steel punched star-shaped supports secured along a shaft at spaced locations for retaining a plurality of laminated rotor sections. The star-shaped supports have four equiangularly spaced arms having arcuate valleys disposed therebetween that define a plurality of channels for receiving the rotor sections. The rotor sections are secured to the star-shaped core by a plurality of bands fastened circumferentially around the rotor. A plurality of grooves disposed circumferentially around the rotor receive and retain the bands in place. A rotor bar and arcuate spring may be disposed within a concave cavity defined by the rotor sections to reduce audible noise produced as the rotor rotates at a high rate of speed and provide added compression on the rotor sections to the core. The rotor sections also include a dimpled separator of predetermined thickness disposed between the laminate sheets to optimize the machine. The separator is a steel sheet having a plurality of dimples that define the thickness of the separator. This results in a high speed axially-laminated synchronous reluctance rotor running at high speeds without any bolts or end caps in the rotor.

DETAILED DESCRIPTION It is, therefore, an object of the present invention to provide an improved rotor for a synchronous reluctance machine that secures the rotor sections to the shaft at low cost and simplify manufacturing.
It is another object of the present invention to provide an improved rotor for a synchronous reluctance machine that runs cooler than conventional rotors.
It is a further object of the present invention to provide an improved rotor having magnets disposed within the core to increase magnetic flux which increases the power factor of the machine and provides a wider range of rotational speed.
It is yet another object of the present invention to provide an improved rotor having rotor bars, spacers and bands for securing the rotor sections to the core which provides additional compression at the center of the rotor sections to enable operation of the rotor assembly at high rotational speeds without using any bolts or end caps to retain the rotor.
It is still another object of the present invention to provide an improved rotor that includes variable thickness laminate sections of the rotor sections to adjust the width of the rotor sections to be equal to or an integer of the stator tooth width to optimize the performance of the reluctance machine.
It is a further object of the present invention to provide an improved rotor that reduces outward thermal expansion.
It is yet another object of the present invention to provide an improved rotor that retains the rotor sections to the core using inexpensive filaments in different locations on the rotor to assure rotor integrity at high rotational speeds.
In accordance with the present invention, there is provided a rotor assembly for a synchronous reluctance motor that includes a star-shaped core secured on a rotor shaft.
The core has a plurality of channels for supporting a plurality of generally arcuate rotor sections which are retained on the core by a plurality of bands disposed circumferentially about the rotor sections.
In accordance with another aspect of the present invention, there is provided a method of manufacturing a rotor assembly for a synchronous reluctance machine

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