Simple rugged motor and compressors built thereby

A simple rugged motor with single rotor, comprising:

• a stator including an even number of major magnetic pole arms and an even number of minor magnetic pole arms annularly arranged at an isometric angle to form a space in a center thereof, said number of the minor magnetic pole arms being identical to said number of the major magnetic pole arms, and said minor magnetic pole arms interposed between said major magnetic pole arms;
• each magnetic pole arm further having a pole face facing toward said space, each major magnetic pole arm wound by a major coil winding and each minor magnetic pole arm wound by a minor coil winding;
• a rotor disposed in the space and including a number of pole teeth annularly arranged at an isometric angle to form a central hole, the number of pole teeth being identical to the number of the major magnetic pole arms;
• each pole tooth having a surface at a far end from the central hole with a gap formed between each surface and corresponding pole face;
• a motor top cover screwed on a top of the stator;
• a motor bottom cover screwed on a bottom of the stator;
• a rotary plate engaging in the central hole of the rotor and including an axle hole;
• at least one bearing engaging in the axle hole of the rotary plate;
• a motor shaft engaging through the axle hole of the rotary plat;
• and the bearing and having a lower end thereof screwed on the motor bottom cover, the rotary plate thereby rotates in the space of the stator during operation;
• and
• a control unit electrically connected to the stator and including an encoder mask to be driven by the rotary plate for operation, a photo sensor assembly engaging an inner periphery of the stator, and a control circuit connecting the stator to a power source via a switch, said encoder mask controlling operation of said photo sensor assembly to produce signals for activating and deactivating said switch;
• the major coil windings being electrified by the power source when said switch is turned on and the minor coil windings being electrified by a capacitor when said switch is turned off, thereby the corresponding coil windings produce magnetic fields to keep the rotor and the rotary plate steadily driven.