Miniature self-starting electric motor

A miniature self-starting electric motor comprising a rotor shaft rotatably disposed in a casing;

• two rotors fixed to said rotor shaft and each having a circular body portion of soft magnetic material, each said circular body portion having a periphery with pole teeth extending therefrom and spaced from each other at equal angular spacings;
• two exciting coils each being disposed to face the pole teeth;
• two permanent magnets each providing radially north and south poles alternating at an equal angle, the poles of each said permanent magnet being axially aligned with poles of the same polarity of the other magnet, the poles of each said permanent magnet facing the pole teeth of the corresponding rotor, the number of poles on each permanent magnet being an even multiple of the number of pole teeth, said two rotors being opposed to each other, the pole teeth of one of said two rotors being staggered from the pole teeth of the other by a predetermined electric angle;
• the pole teeth of one said rotor being circumferentially offset from the pole teeth and intervening spaces therebetween of the other rotor by another preselected angle;
• and a condensor alternatively connectible to either one of said two exciting coils for selecting the direction of rotation of said motor.