Crimped rotor for an electric brushless direct current motor

Details Crimped rotor for an electric brushless direct current motor Crimped rotor for an electric brushless direct current motor

H - Electricity

02

K

H02K 5/128 (2006.01) H02K 1/27 (2006.01) H02K 16/04 (2006.01)

Patent

CA 2686949

A rotor having a substantially cylindrical configuration for use in a brushless direct current electric motor having a high torque to size ratio. The rotor has an outer peripheral surface. The rotor also has a central rotor shaft and a first and second retaining ends mounted on the central rotor shaft and spaced from one another. The rotor also has a plurality of magnets configured to provide a magnetic flux with a stator disposed around the central rotor shaft. The magnets are radially disposed on the shaft and the rotor also has a sheath. The sheath is crimped around the radially disposed permanent magnets, and holds the magnets around the shaft. The sheath is lightweight and minimizes a gap between the permanent magnets and the stator to provide for an electromagnetic flux between the magnets and the stator windings, and for rotation of the central rotor shaft.

La présente invention concerne un rotor de forme sensiblement cylindrique destiné à un moteur à courant continu sans balais au rapport couple/dimensions élevé. Ce rotor présente une surface périphérique extérieure. Ce rotor comporte également un arbre central de rotor, et deux extrémités de retenue montées sur l'arbre central du rotor à une certaine distance l'une de l'autre. Le rotor comporte également une pluralité d'aimants configurés pour produire un flux magnétique avec un stator disposé autour de l'arbre central du rotor. Les aimants sont disposés radialement sur l'arbre. Le rotor est également pourvu d'une gaine. Cette gaine, qui est sertie autour des aimants permanents disposés radialement, maintient les aimants autour de l'arbre. En outre, cette gaine qui est légère minimise un intervalle entre les aimants permanents et le stator de façon à permettre, d'une part la production d'un flux électromagnétique entre les aimants et les enroulements du stator, et d'autre part la rotation de l'arbre central du rotor.

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