Stepping motor
A stepping motor, iron core technology, applied in electrical components, electromechanical devices, etc., can solve the problems of reduced motor output torque, reduced stopping accuracy, insufficient contact, etc., to prevent the increase of magnetic resistance, easy assembly, and reduced magnetic unbalanced effect of resistance
Inactive Publication Date: 2006-10-18
SANKYO SEIKI MFG CO LTD
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Problems solved by technology
[0007] However, in the aforementioned stator, since the outer iron cores 103, 104 and the outer iron cores 107, 108 are clearance fit, and the overall length of the insert molded product of the iron cores is shorter than the inner dimensions of the outer iron cores 107, 108, Therefore, the contact between the outer iron cores 103, 104 and the outer iron cores 107, 108 is insufficient, which may lead to an increase in reluctance
If the reluctance increases, the output torque of the motor will decrease and the stopping accuracy will decrease.
Method used
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Embodiment Construction
[0024] (Structure of motor)
[0025] figure 2 It is a cross-sectional view of main parts of a PM (permanent magnet) type stepping motor to which the present invention is applied.
[0026] figure 1 for figure 2 An exploded assembly diagram of the stepping motor 1 shown.
[0027] (composition of motor)
[0028] figure 1 and figure 2 The stepping motor 1 of the present embodiment shown includes: a rotor portion 2 having a rotating shaft 21 and a rotor magnet (permanent magnet) 22; a stator 3 disposed opposite to the rotor magnet 22 with a gap; It is rotatably supported by the bearing 4, and is elastically biased in the axial direction by the spring member 5 abutting on one end of the rotating shaft 21 .
[0029] On the rotating shaft 21 constituting the rotor unit 2 , a rotor magnet 22 is fixed to the rotating shaft 21 by bonding, and the rotor magnet 22 is composed of a substantially cylindrical permanent magnet.
[0030] Circular concave portions are formed on both...
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In the stepping motor (1) of the present invention, it includes: a plurality of pole teeth erected on the inner periphery of the annular inner iron core (31, 32); winding coils (33, 34) assembled on the pole teeth; And the outer iron core (37,38) that doubles as the motor housing of the inner iron core (31,32) and the winding coil (33,34) is installed, and the inner iron core (31,32) includes the inner iron core arranged in the axial direction Core (31a, 32a) and outer iron core (31b, 32b), and the outer diameter of outer iron core (31b, 32b) is smaller than the inner diameter of outer iron core (37, 38), and outer iron core (31b, 32b) The axes of the relative outer cores (37, 38) are uniformly fixed. The reluctance between the inner core and the outer core of the stepping motor can be reduced.
Description
(1) Technical field [0001] The invention relates to a stepping motor. In particular, the present invention relates to the stator structure of a stepping motor. (2) Background technology [0002] As a stator structure of a stepping motor, there is generally known a structure in which windings are provided on two insert-molded iron cores, and then a housing integrally formed with pole teeth is assembled thereon. However, if the overall length of the motor is longer than the outer diameter of the motor, it is difficult to integrally form the pole teeth with the case. [0003] Therefore, if image 3 As shown, when manufacturing a motor 100 with a long overall length, the four iron cores 101 to 104 of the two inner iron cores 101 and 102 and the two outer iron cores 103 and 104 provided on both outer sides are first insert-molded. , and then set the windings 105, 106 thereon, and then assemble the outer iron cores 107, 108 which also serve as the motor case to form the stator. ...
Claims
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Inventor 上松郁夫
Owner SANKYO SEIKI MFG CO LTD