Claw pole rotor with cavity for minimizing flux leakage

摘要

A rotor for a rotary electric machine, the rotor including first and second pole pieces each having a respective magnetic hub arranged for rotation about an axis along which they are spaced. Pluralities of magnetic first and second pole fingers are spaced from each other and extend between the hubs. Each pole finger has a proximal end connected to its respective hub, and an axially opposite distal end. The first and second pole fingers circumferentially alternate about the axis, and each pole finger has a respective radially inner surface defining a cavity that extends axially from the distal end to a cavity terminus. Relative to each pole finger, at a respective axial position between the distal end and the cavity terminus the radial distance between the axis and the radially inner surface is substantially greater inside of the cavity than outside of the cavity.

主权项

1. A rotor for a rotary electric machine, said rotor comprising:
a first pole piece and a second pole piece each having a respective magnetic hub arranged for rotation about an axis, the first and second pole piece hubs spaced along the axis; a plurality of magnetic first pole fingers and a plurality of magnetic second pole fingers spaced from each other and extending between the first and second pole piece hubs, each pole finger having a proximal end and an axially opposite distal end, the first and second pole finger proximal ends connected to the respective one of the first and second pole piece hubs, the first and second pole fingers circumferentially alternating about the axis, each pole finger having a respective radially inner surface defining a cavity that extends axially from the distal end to a cavity terminus; and relative to each pole finger, at a respective axial position between the distal end and the cavity terminus the radial distance between the axis and the radially inner surface is substantially greater inside of the cavity than outside of the cavity and wherein a depth of the cavity diminishes along a length of the cavity in an axial direction with the distal end of the cavity having a greater depth than the cavity terminus.