Low-speed discoidal electric motor

H - Electricity – 02 – K

Patent

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Details

H02K 37/00 (2006.01)

Patent

CA 2494466

Low-speed electric motor of lightweight construction with rotor diameter greater than 500mm, its width of a few cm, without a gearbox, with starting torque being of an order 100Nm, it makes use of the principle of Coulomb forces. The dimensional arrangement of both the rotor and stator even at high level of torques eliminates flip - flop effect, which is typical for conventional step motors. Rotor consists of rotor disks (10) with a fixing ring (7). The carrier (1) of the permanent magnets (2) is attached to the fixing ring (7). The rotor is linked with fixing hub (14) by means of ball bearings (13) whose bearing bushings (12) are mounted with the rotor disks (10). The stator disk (11) is attached to the fixing hub (14). The segment in the shape of circular section made from soft magnetic material (3), which the coils are slid on, is accommodated in the spokes (8) fixed by the shank (9) to the stator disk (11). Relative position of every coil (4) relative to the permanent magnet (2) is monitored by the position indicator (5). The stator segments (3), which the coils (4) are placed on, making up the poles of the motor, are compensated and they are neutral from the point of view of forces F Fe with the resultants of these forces (17), that are created by a coincidence of the permanent magnets of the rotor (2) and the segment of the stator (3) made from soft magnetic material and simultaneously compensated by zero resultant intensity of the magnetic flux .SIGMA.H = 0 on the poles (15) of the segments (3) relative to the permanent magnets of the rotor (2) in all motor control modes for the reason of gradual connecting the stator coils (4) to the voltage and thanks to it no parasite forces (18) are produced bringing about the flip-flop effect and vibrations because the design engineering arrangement satisfies simultaneously the following interrelations: 1. The number and design engineering arrangement of the permanent magnets of the rotor (2) 2. The number and design engineering arrangement of the stator segments made from soft magnetic material (3) 3. The number of the motor phases 4. The number and position of stator coils (4) that make up the poles of the motor installed on every segment (3) depending on the number of motor phases.

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