Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1985-06-03
1986-12-16
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310268, 310271, H02K 2112
Patent
active
046299203
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an alternating current synchronous servomotor of the kind at which a disk-shaped rotor is located between two stator halves of which each is provided with a bearing for a shaft supporting the rotor and comprise each a magnetiron part having a plurality of radial grooves and an electrical coil having leads inserted in the radial grooves which rotor comprises an even number of flat permanent magnet parts having magnet field lines extending parallel to the shaft, which pemanent magnet parts form an annular like series including interstices extending around a hub supported on the shaft and of a magnetically not conductive material and have that sides acting as magnetic pole surfaces which extend in parallel planes to which the axis of the shaft extend, perpendicularly and are serially alternating north and south poles, and whereby the interstices between adjacent permanent magnet parts diverge radially towards the outside.
A motor with a rotor of the described design is known e.g. from a Japanese patent application according to the publication IP-A 53-116 410 (1978). It, however, encompasses obviously a motor having a relatively low output e.g. for the drive of the capstan shaft of a portable cassette tape recorder apparatus.
The invention is based on the object to provide a alternating current synchronous servomotor which can be designed specifically for the output range from 50 W to 50 kW and can generate an accordingly high torque, which motor is to incorporate a relative short axial dimension and in comparison with known servo-motors a higher efficiency and lower weight per unit of output. The servo-motor to be provided shall, furthermore, be designed such that its rotor can follow with as little as possible delay the electrical alternating current impulses given to the stator windings and which are e.g. provided by a machine controlled static converser. Accordingly, the rotor shall feature a relatively low mass and the winding of each stator half shall incorporate a compact volume such that the electrical inductivity remains as small as possible. It is also an object of the invention to design the servo motor such that its rotor is as much as possible free from any reluctance in order to allow a smooth rotary motion of the rotor also at extemely low r.p.m.'s and low loads.
These objects are solved by the inventive alternating current synchronous servomotor of which the decisive design features are defined in the appended claims.
Particulars and advantages of the invention follow from the following description of exemplary embodiments of the inventive motor and the corresponding drawings, which are to serve for explaining the invention as examples only.
FIG. 1 illustrates an axial section through an alternating current synchronous servomotor according to the invention;
FIG. 2 discloses a part of the rotor of the servomotor according to FIG. 1 viewed in the direction of the axis, whereby the cover plate facing the viewer is partly broken away;
FIG. 3 is an axial partial section according to line III--III in FIG. 2, shown on an enlarged scale;
FIG. 4 illustrates a somewhat different embodiment of the rotor in a partial illustration and viewed in direction of the shaft;
FIG. 5 is an axial partial section according to line V--V in FIG. 4 shown on an enlarged scale;
FIG. 6 is a schematic illustration, similar to FIG. 2, for illustrating the design and arrangement of the permanent magnet pole surfaces of the rotor relativ to the electric winding for one phase in one stator half;
FIG. 7 illustrates a plurality of diagrams for illustrating the performance relative to time of the induced electrical voltage in a three-phase motor according to the invention;
FIG. 8 is a voltage-vector diagram of an inventive three-phase motor having a number of grooves not dividable by three; and
FIG. 9 is an analogne voltage-vector diagram for the suitably interconnected windings of the two stator halves of the three-phase motor to which FIG. 8 refers to.
The alternating current synchronous servomoto
REFERENCES:
patent: 3121814 (1964-02-01), Kober
patent: 3320453 (1967-05-01), Kober
patent: 3553510 (1971-01-01), Howey
patent: 4433261 (1984-02-01), Nashiki et al.
patent: 4578610 (1986-03-01), Kliman
Duggan Donovan F.
Mavilor Systeme SA
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