Patent ID: 7761976

Claim:
A method for mounting magnet elements ( 22 a , 22 b , 22 c , 22 d ) on a rotor ( 28 ) for use in a permanent magnet motor, comprising the steps: providing a first tubular element ( 20 ), wherein said first tubular element ( 20 ) has an inner diameter that corresponds to an outer diameter of said rotor ( 28 ), and has a thickness of 0.5-1.7 millimeters in the radial direction, providing a second tubular element ( 24 ), wherein said second tubular element ( 24 ) has an inner diameter that is larger than an outer diameter of said first tubular element ( 20 ), inserting said first tubular element ( 20 ) into said second tubular element ( 24 ), in order to create a hollow space between them, thereafter inserting a number of magnet elements ( 22 a , 22 b , 22 c , 22 d ) into said hollow space, and thereafter inserting said rotor ( 28 ) into said first tubular element ( 20 ), the first tubular element ( 20 ) being radially expanded, whereupon said magnet elements are in a tight fit arrangement between said first tubular element ( 20 ) and said second tubular element ( 24 ).