Method of making a wedge-shaped permanent magnet rotor assembly

Disclosed herein is a linear dc motor comprising a field magnet composed of plural magnetic poles, and an armature formed by arranging armature coils along the moving direction of a moving element at a position facing the field magnet One of the field magnet and armature is attached to the moving element, and the other is provided on a stator yoke serving as a stator Projecting edges for linear guide, each of which projects outside and has a triangular form in cross section, are provided on both sides of the stator yoke, and guide rollers, each of which has an engaging groove in the form of a valley in its side part coming into slidable contact with the projecting edge for linear guide, are attached to the moving element There is no possibility that the moving element is derailed because it is supported by the projecting edges of linear guide and the guide rollers It is therefore possible to make the thrust of the moving element greater and cause it to travel at high speed

Linear direct current motor

A permanent magnet rotor includes a rotor core having an axis of rotation and longitudinally extending radially projecting ribs. A plurality of arcuate magnetic elements are retained against an outer surface of the rotor by a cylindrical shell such that each magnet is disposed between a pair of the ribs. A hardenable adhesive is interposed between the outer surface of the core and the magnets and cooperates with the ribs and magnets to prevent rotational slippage of the magnets relative to the core during rotation of the rotor. Various embodiments utilize different techniques for retaining the components in assembled relation.

Method of making a permanent magnet rotor

In an electric motor having a plurality of magnets bonded to a rotor hub, a composite sleeve is disposed over the rotor hub and magnets. The composite sleeve may be wound directly upon the rotor hub, or the composite sleeve may be wound upon a mandrel and slid over the rotor hub.

Method for manufacturing a composite sleeve for an electric motor

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.

Method for making permanent magnet rotor

A process for making a rotor assembly for a permanent magnet generator. The rotor assembly comprises a ferromagnetic hub and a ring-shaped cobalt and rare earth alloy magnet which is mounted on the hub. The process for making a rotor assembly includes applying to a hub a coating of inert material having a melting point above the sintering temperature of the cobalt alloy magnet before pressing and sintering the cobalt alloy onto the ferromagnetic hub.

A Duane Peterson

Papers

Process for making a rotor assembly