초록 ▼

A permanent magnet rotor for an electronically commutated motor (ECM) has a core, a plurality of magnetizable elements spaced around the core, and a thin-walled retaining shell which has been stretched around the core and magnetizable elements to hold the elements in position. The rotor is made by a

A permanent magnet rotor for an electronically commutated motor (ECM) has a core, a plurality of magnetizable elements spaced around the core, and a thin-walled retaining shell which has been stretched around the core and magnetizable elements to hold the elements in position. The rotor is made by an inventive method which involves axially aligning the core and surrounding magnetizable elements with the retaining shell, and cold-pressing the retaining shell over the core and elements to sandwich the elements between the shell and core. The core and magnetizable elements serve as a mandrel about which the shell is reformed in a cold working operation. Other aspects of the invention include the fixturing apparatus used to align the core and magnetizable elements with the retaining shell, and apparatus which is used to evenly space the magnetizable elements around the core and hold the elements in position during at least a portion of the cold-pressing operation. Additional features of certain embodiments of the rotor of the present invention include end plates axially disposed adjacent the ends of the rotor core and magnetizable elements, and the use of adhesives between the core and magnetizable elements and/or the ends of the core and magnetizable elements and the end plates.

대표청구항 ▼

A method of making a permanently magnetizable rotor which includes a core, a plurality of magnetizable elements, and a retaining shell, said method comprising the steps of: a. placing the magnetizable elements around the core and temporarily holding the elements in position; b. axially aligning the

A method of making a permanently magnetizable rotor which includes a core, a plurality of magnetizable elements, and a retaining shell, said method comprising the steps of: a. placing the magnetizable elements around the core and temporarily holding the elements in position; b. axially aligning the core and magnetizable elements with the retaining shell; and c. pressing the retaining shell longitudinally over the core and magnetizable elements in a manner to permanently retain the magnetizable elements in position around the core.