Disk-type electric motor, electrically driven vehicle and method for controlling the same

An electrically driven vehicle, comprising:

• at least two wheels;
• a single-phase control circuit;
• and
• a disk-type electric motor, further comprising:
• a magnetic rotor having a rim and a plurality of equally spaced magnetic poles around the rim;
• and
• a stator having a stator core that includes tooth portions and boot portions and a plurality of series connected coil windings,
• wherein the plurality of series connected coil windings are driven by a driving signal generated by the single-phase control circuit to produce an electromagnetic field of alternating polarity,
• wherein each of the magnetic poles comprises a permanent magnet, and a radial magnetic flux density of the permanent magnet on a radial outer surface of the permanent magnet is substantially higher at both edges than a middle portion along a circumferential direction of the magnetic rotor.

A method for controlling a disk-type electric motor, wherein the BLDC motor includes a magnetic rotor having a rim and a plurality of equally spaced magnetic poles around the rim and a stator having a stator core that includes tooth portions and boot portions and a plurality of series connected coil windings, the method comprising:

• with a single phase control scheme, providing a driving signal for driving the plurality of series connected coil windings;
• in response to the driving signal, producing an electromagnetic field of alternating polarity;
• and
• via an interaction of the electromagnetic field with a radial magnetic flux density of the magnetic poles, rotating the magnetic rotor, wherein each of the magnetic poles comprises a permanent magnet, and the radial magnetic flux density of the permanent magnet on a radial outer surface of the permanent magnet is substantially higher at both edges than a middle portion along a circumferential direction of the magnetic rotor.