초록 ▼

A rotor includes a shaft; a permanent magnet layer; and a retainer comprising a conductive, low magnetic permeability material bound to the rotor shaft. The permanent magnet layer is semi-restricted between the shaft and the retainer. In one embodiment, the magnet layer includes a molded ring magnet

A rotor includes a shaft; a permanent magnet layer; and a retainer comprising a conductive, low magnetic permeability material bound to the rotor shaft. The permanent magnet layer is semi-restricted between the shaft and the retainer. In one embodiment, the magnet layer includes a molded ring magnet. In another embodiment, the magnet layer includes a plurality of magnet segments which can be situated on the rotor in rotor pockets or in a rotor cage. The bond between the retainer and the rotor can be enabled by a cap or by support elements. A high conductivity material can be situated over the retainer with the combination of the retainer and the high conductivity material having a resistivity high enough to minimize space harmonic losses and low enough to minimize time harmonic losses. The high conductivity material can also be applied to induction rotors for excluding high frequency components while permitting penetration of low frequency torque producing fields.

대표청구항 ▼

[ What is claimed is:] [1.] A rotor comprising:a rotor shaft;a permanent magnet layer having an inner diameter which is greater than an outer diameter of the rotor shaft, the permanent magnet layer and the shaft having a radial clearance therebetween;a retainer comprising a metallic, low magnetic pe

[ What is claimed is:] [1.] A rotor comprising:a rotor shaft;a permanent magnet layer having an inner diameter which is greater than an outer diameter of the rotor shaft, the permanent magnet layer and the shaft having a radial clearance therebetween;a retainer comprising a metallic, low magnetic permeability material, the permanent magnet layer being positioned between the rotor shaft and the retainer, the retainer being bound to the rotor shaft, the permanent magnet layer comprising a material less stiff than a material of the retainer so as to expand to remain in contact with the retainer as a speed of the rotor is increased.