초록 ▼

An electric motor includes a stator having a stator core, a start winding and first and second main windings. The first main winding and the start winding are configured to form a lower number of poles than the second main winding. The stator core forms a stator bore. The motor also includes a rotor

An electric motor includes a stator having a stator core, a start winding and first and second main windings. The first main winding and the start winding are configured to form a lower number of poles than the second main winding. The stator core forms a stator bore. The motor also includes a rotor having a rotor shaft concentrically arranged axially of the stator core and a rotor core positioned concentrically with the rotor shaft. Secondary conductors are arranged axially of the rotor shaft and extend through the rotor core. A plurality of permanent magnets are located at an outer periphery of the rotor core and are magnetized to form a number of poles equal to the number of poles formed by the second main winding.

대표청구항 ▼

[ What is claimed is:] [1.] A method of fabricating a rotor for an electric motor, said method comprising the steps of:forming a rotor core, the core having an outer periphery, a central rotor shaft opening, a plurality of secondary conductor openings radially offset from the outer periphery, and a

[ What is claimed is:] [1.] A method of fabricating a rotor for an electric motor, said method comprising the steps of:forming a rotor core, the core having an outer periphery, a central rotor shaft opening, a plurality of secondary conductor openings radially offset from the outer periphery, and a plurality of notches, each of the notches having an open end at the outer periphery of the core;securing permanent magnet material in each of the notches; andsecuring secondary conductors within each of the secondary conductor openings, a number of poles formed by the permanent magnet material selected to be different from a number of poles formed by the secondary conductors in operation. [2.] A method in accordance with claim 1 wherein the step of securing secondary conductors comprises pressure casting aluminum in the secondary conductor openings and further comprises pressure casting first and second end rings attached to respective ends of the secondary conductors.