JP2015171194A - Motor, motor device and pointer type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of suppressing oscillation of a rotor toward a radial direction, as well as a motor device and a pointer type display device having the motor.SOLUTION: In a motor 1, coils 9 are arranged around each of two salient poles 61f, 61b (main poles) located in a first angular range θ1 of less than 180 degrees, out of a plurality of salient poles 61 of a stator core 60. Salient poles 61c-61e located in a second angular range θ2 of 180 degrees centered on an extended line Lb of a virtual bisector La that bisects the first angular range θ1 on a side opposite to a side where the two main poles (salient poles 61f, 61b) are located, out of the plurality of the salient poles 61, are first interpoles around which coils 9 are not arranged. A first interval g1 between the main poles (salient poles 61f, 61b) and a magnet 50 is smaller than a second interval g2 between the first interpoles (salient poles 61c-61e) and the magnet 50.

Description

  The present invention relates to a motor in which a coil is wound around two salient poles among a plurality of salient poles of a stator core provided along a circumferential surface of a magnet, a motor device, and a pointer-type display device.

  In a display device such as an automotive meter device, a structure in which a pointer is attached by a motor may be employed. On the other hand, a configuration has been proposed in which a plurality of salient poles of a stator core are arranged along the circumferential surface of a magnet, and a coil is wound around two salient poles among the plurality of salient poles (see Patent Document 1). ).

Japanese Patent No. 2005-333786

  In the motor described in Patent Document 1, when the rotor rotates, a force acts on the rotor from each of two radial directions orthogonal to the rotation center axis of the rotor. Further, the force applied to the rotor from the radial direction reverses as the rotor rotates. For this reason, the rotor vibrates, which causes, for example, the generation of abnormal noise or a reduction in bearing life.

  In view of the above problems, an object of the present invention is to provide a motor capable of suppressing vibration of a rotor in the radial direction, a motor device including the motor, and a pointer-type display device.

  In order to solve the above-described problems, a motor according to the present invention has a rotor including a magnet in which S poles and N poles are alternately provided in the circumferential direction, and a tip portion with a gap between the outer peripheral surfaces of the magnets. A stator core having a plurality of opposing salient poles arranged in the circumferential direction, and a coil arranged around each of two main poles of the plurality of salient poles located in an angular range of less than 180 °. Of the plurality of salient poles, 180 ° centered on an extension of a virtual bisector that bisects the first angle range on the side opposite to the side where the two main poles are located. The salient pole located in the second angle range is a first complementary pole in which a coil is not disposed around, the first interval between the tip of the main pole and the outer peripheral surface of the magnet, and the first complementary pole The second interval between the tip of the magnet and the outer peripheral surface of the magnet is different. The

  In the present invention, the first interval between the tip of the main pole disposed in the first angle range and the outer peripheral surface of the magnet and the second angle range located in the second angle range opposite to the side where the two main poles are located. The second interval between the 1 auxiliary pole and the outer peripheral surface of the magnet is different. For this reason, the magnetic attraction force between the magnet and the main pole is different from the magnetic attraction force between the magnet and the first auxiliary pole. Accordingly, the rotor rotates in a state where it receives a side pressure directed toward one of the first angle range where the main pole is located or the second angle range where the first supplementary pole is located, so the rotor is less likely to vibrate. . Therefore, it is possible to suppress the occurrence of abnormal noise caused by vibration.

In the present invention, the first interval is preferably narrower than the second interval. When the main pole is brought closer to the magnet than the first auxiliary pole, the magnetic attraction force with respect to the rotor is increased, which is effective in suppressing the vibration of the rotor.

  In this case, between the two main poles, there is a second complementary pole in which no coil is arranged, and the second interval is between the tip of the second complementary pole and the outer peripheral surface of the magnet. It is preferable that it is narrower than this interval.

  In the present invention, the second interval may be narrower than the first interval.

  In this case, between the two main poles, there is a second complementary pole in which no coil is arranged, and the second interval is between the tip of the second complementary pole and the outer peripheral surface of the magnet. It is preferable that it is narrower than this interval.

  In the present invention, the tip of the first auxiliary pole may be configured to be located radially outside or radially inside a virtual circle inscribed in the tip of the two main poles. According to this configuration, it is possible to apply a lateral pressure due to a magnetic attractive force to the rotor by changing the size of the main pole or the first auxiliary pole.

  In the present invention, the tip of the first complementary pole is located on a virtual circle inscribed in the tip of the two main poles, and the rotation center of the rotor is changed from the center of the virtual circle to the two main poles. You may employ | adopt the structure which has shifted | deviated to the direction which approaches, or the direction which spaces apart from the said 2 main pole. According to this configuration, it is possible to apply a lateral pressure due to the magnetic attractive force to the rotor by shifting the rotation center of the rotor.

  The motor according to the present invention can be used in a motor device, and the motor device includes a train wheel that transmits the rotation of the rotor, and an output member that transmits the rotation of the rotor via the train wheel. Have.

  The motor device according to the present invention can be used in a pointer-type display device, and in such a pointer-type display device, the pointer is driven by the output member.

  In the present invention, the first interval between the tip of the main pole disposed in the first angle range and the outer peripheral surface of the magnet and the second angle range located in the second angle range opposite to the side where the two main poles are located. The second interval between the 1 auxiliary pole and the outer peripheral surface of the magnet is different. For this reason, the magnetic attraction force between the magnet and the main pole is different from the magnetic attraction force between the magnet and the first auxiliary pole. Accordingly, the rotor rotates in a state where it receives a side pressure directed toward one of the first angle range where the main pole is located or the second angle range where the first supplementary pole is located, so the rotor is less likely to vibrate. . Therefore, it is possible to suppress the occurrence of abnormal noise caused by vibration.

It is explanatory drawing of the motor apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the motor used for the motor apparatus which concerns on Embodiment 1 of this invention. It is a top view of the motor used for the motor apparatus concerning Embodiment 1 of the present invention. It is explanatory drawing which shows typically the air gap of the salient pole and magnet in the motor used for the motor apparatus which concerns on Embodiment 1 of this invention. It is a graph which shows the evaluation result of the radial direction force (side pressure) which a rotor receives in the motor used for the motor apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows typically the air gap of a salient pole and a magnet in the motor used for the motor apparatus which concerns on the modification of Embodiment 1 of this invention. It is explanatory drawing which shows typically the air gap of the salient pole and magnet in the motor used for the motor apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows typically the air gap of a salient pole and a magnet in the motor used for the motor apparatus which concerns on the modification of Embodiment 2 of this invention. It is explanatory drawing which shows typically the air gap of the salient pole and magnet in the motor used for the motor apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows typically the air gap of the salient pole and magnet in the motor used for the motor apparatus which concerns on Embodiment 4 of this invention.

  Hereinafter, a motor, a motor device, and a pointer type display device to which the present invention is applied will be described with reference to the drawings.

[Embodiment 1]
(Overall configuration of motor device)
FIG. 1 is an explanatory diagram of a motor device 100 according to Embodiment 1 of the present invention, and FIGS. 1A and 1B are perspective views of the motor device 100 as seen from the side from which an output shaft 10 protrudes. FIG. In the following description, in the direction in which the axis L of the output shaft 10 extends, the side on which the output shaft 10 projects is referred to as one side L1, and the side opposite to the side on which the output shaft 10 projects is defined. The other side is L2. The axis of the rotor 5 in the motor 1 is the rotation center axis L0. For the sake of convenience, one side of the rotation center axis L0 is also referred to as one side L1, and the other side of the rotation center axis L0 is also referred to as the other side L2.

  The motor device 100 shown in FIG. 1 has a structure in which an output shaft 10 (output member) protrudes from the case 2 on one side L1 in the axis L direction. The motor device 100 of this embodiment is used in a pointer type display device 200, and a pointer 11 is connected to the output shaft 10.

  The case 2 has a first case 21 that is substantially circular when viewed from the direction of the axis L, and a second case 22 that is substantially circular when viewed from the direction of the axis L. The first case 21 is disposed on the other side L2 in the axis L direction, and the second case 22 is disposed on the one side L1 in the axis L direction. The side plate portion 211 of the first case 21 has convex portions 219 formed at a plurality of locations in the circumferential direction, and the side plate portion 221 of the second case 22 engages with the convex portions 219 at a plurality of locations in the circumferential direction. A hook 229 is formed. Therefore, the case 2 can be configured by engaging the hook 229 and the convex portion 219 to join the first case 21 and the second case 22 together. In the case 2 configured as described above, the bottom plate portion 222 of the second case 22 is formed with a cylindrical portion 223 that supports the output shaft 10.

(Configuration of motor 1)
The motor device 100 has a motor 1 inside a case 2. The motor 1 has a rotor 5 rotatably supported by the case 2 and a stator 6 disposed around the rotor 5. The rotor 5 has a rotating shaft 51 that is rotatably supported by the case 2.

  The rotor 5 includes a pinion 58 fixed to one end L1 of the rotation shaft 51 in the direction of the rotation center axis L0, and a cylindrical magnet 50 integrated with the pinion 58. On the outer peripheral surface, S poles and N poles are alternately formed at equiangular intervals. In this embodiment, the magnet 50 and the pinion 58 are integrated by insert molding, and the magnet 50 and the pinion 58 are coupled by a resin disc portion 59. Further, the disc part 59 is fixed to the rotating shaft 51.

Further, the motor device 100 has a train wheel 4 that decelerates the rotation of the rotor 5 and transmits it to the output shaft 10. The train wheel 4 is also supported by the case 2 like the rotor 5 and the stator 6. Yes. The train wheel 4 includes a first gear 41 that includes a large-diameter gear 411 that meshes with the pinion 58 of the rotor 5 and a small-diameter gear (not shown) that meshes with the second gear 42, and a small-diameter gear of the first gear 41. And a large-diameter second gear 42 that meshes therewith. The output shaft 10 is formed integrally with the second gear 42, and the output shaft 10 is rotatably supported by the concave portion 215 of the first case 21 and the cylindrical portion 223 of the second case 22. The first gear 41 is rotatably supported by the support shaft 48, and both ends of the support shaft 48 are held by the shaft hole 216 and the second case 22 of the first case 21.

(Detailed configuration of stator 6)
2 is an explanatory diagram of the motor 1 used in the motor device 100 according to Embodiment 1 of the present invention. FIGS. 2A, 2B, and 2C are perspective views of the motor 1, and FIG. FIG. 2 is an exploded perspective view of the motor 1 and an exploded perspective view showing a state where the motor 1 is further finely disassembled. FIG. 3 is a plan view of the motor 1 used in the motor apparatus 100 according to Embodiment 1 of the present invention.

  As shown in FIG. 2 and FIG. 3, in the motor 1, the stator 6 has a stator core 60 having a plurality of salient poles 61 (salient poles 61 a to 61 f) opposed to the outer peripheral surface of the magnet 50 with a gap. The plurality of salient poles 61 are connected by a connecting portion 65. The stator 6 includes a coil bobbin 7 (coil bobbin 7a) mounted on the salient pole 61f (main pole) among the plurality of salient poles 61, and a coil 9 (first) that circulates around the salient pole 61f via the coil bobbin 7. One coil 9a), a coil bobbin 7 (coil bobbin 7b) mounted on the salient pole 61b (main pole) among the plurality of salient poles 61, and a coil 9 (first) that circulates around the salient pole 61b via the coil bobbin 7. 2 coils 9b). In this embodiment, the number of salient poles 61 is six, and in the magnet 50, four pairs of S poles and N poles are formed. Further, the main poles (the salient poles 61f and 61b) are arranged on the first gear 41 side shown in FIG. 1 with respect to the rotation center axis L0.

  In the stator 6, a portion where the rotor 5 is disposed is an opening 64, and a plurality of salient poles 61 project from the inner peripheral edge of the opening 64 toward the outer peripheral surface of the magnet 50, and the radial direction of the salient pole 61 Inner tip portions 610a to 610f are opposed to the outer peripheral surface of the magnet 50 via a gap.

  Here, in the stator core 60, the salient poles 61b and 61f to which the coil bobbin 7 is attached are longer than the other salient poles 61a and 61c to 61e. For this reason, the stator core 60 has a portion in which the salient poles 61b and 61f are formed projecting radially outward in a substantially rectangular shape, and the salient poles 61b and 61f extend from the outer peripheral portions of the rectangular portions 69b and 69f of the stator core 60. Projects radially inward.

  The stator core 60 has a plate shape and is configured by stacking a plurality of magnetic plates punched into the above shape. The stator core 60 is formed with a hole 68 in which the support shaft 48 is fitted in the vicinity of the base of the salient pole 61a. The stator core 60 projects radially outward from the salient pole 61d in the radial direction, and the first case 21 shown in FIG. A convex portion 67 sandwiched between the second case 22 is formed.

(Configuration of coil bobbin 7)
The coil bobbin 7a and the coil bobbin 7b are configured symmetrically with respect to a line connecting the salient poles 61a and 61d, and have the same structure. For this reason, the coil bobbin 7a and the coil bobbin 7b will be described with the same reference numerals assigned to common portions.

The coil bobbin 7a includes an insulating bobbin main body 70 having a cylindrical body 71 around which a coil wire 90 forming the coil 9 (first coil 9a) is wound, and two bobbins 70 held by the bobbin main body 70. And terminal pins 8 (terminal pins 8a and 8b). The bobbin main body 70 is made of resin, and the terminal pins 8 are made of metal. The bobbin main body 70 has a trunk portion 7 at an end portion on the radially inner side of the trunk portion 71.
A first collar 72 having an outer dimension larger than 1 is provided, and a second collar 73 having an outer dimension larger than that of the trunk 71 is provided at the radially outer end of the trunk 71. The first collar 72 and the second collar 73 are opposed to each other with the body 71 interposed therebetween, and the coil wire 90 is disposed around the body 71 between the first collar 72 and the second collar 73. It is wound.

  The second flange 73 holds terminal pins 8 (terminal pins 8a and 8b). One end 81 of the terminal pin 8 is soldered after the end of the coil wire 90 is entangled. The other end 82 of the terminal pin 8 protrudes from the first case 21 shown in FIG. 1 and is connected to a wiring material (not shown) such as a wiring board. The body portion 71 has a rectangular cylindrical shape, and the salient pole 61f of the stator core 60 is inserted inside the body portion 71. As a result, the first coil 9a is disposed around the salient pole 61f. The salient pole 61f abuts against a convex portion (not shown) formed on the inner surface of the body portion 71, and the coil bobbin 7 is prevented from being displaced with respect to the salient pole 61f.

  The coil bobbin 7b includes an insulating bobbin main body 70 having a cylindrical body 71 around which a coil wire 90 forming a coil 9 (second coil 9b) is wound, and two bobbins 70 held by the bobbin main body 70. And terminal pins 8 (terminal pins 8a and 8b). Since the configuration of the bobbin main body 70 is the same as that of the coil bobbin 7a, a description thereof will be omitted, but the salient pole 61b of the stator core 60 is inserted inside the body 71 of the bobbin main body 70. As a result, the second coil 9b is disposed around the salient pole 61b.

  In the rectangular portion 69b, the extending portions 651 extending along the salient pole 61b on both sides of the salient pole 61b extend obliquely with respect to the salient pole 61b, and the salient pole 61b and the extending portion 651 The interval widens radially inward. For this reason, it is easy to insert the coil bobbin 7b into the salient pole 61b from the inside in the radial direction. Also in the rectangular portion 69f, the extended portions 651 extending along the salient pole 61f on both sides of the salient pole 61f extend obliquely with respect to the salient pole 61f, and the salient pole 61f and the extended portion 651 are extended. The interval between and widens radially inward. For this reason, it is easy to insert the coil bobbin 7a into the salient pole 61f from the inside in the radial direction.

(Operation)
In the motor 1, the motor device 100, and the pointer-type display device 200 configured as described above, when power is supplied to the coil 9 (first coil 9a and second coil 9b) via the terminal pins 8 (terminal pins 8a and 8b), the rotor 5 rotates, and this rotation is transmitted to the output shaft 10 via the train wheel 4 shown in FIG. Accordingly, the pointer 11 connected to the output shaft 10 rotates. At this time, by inputting a predetermined number of drive pulses to the coil 9, the angular position of the pointer 11 is switched, and the pointer 11 can be rotated clockwise to the target position and then stopped. Further, if a driving pulse for reverse rotation is supplied, the pointer can be rotated counterclockwise to another target position.

(Angle position of salient pole 61)
In this embodiment, the salient poles 61 are arranged at unequal intervals, but the salient pole 61f (main pole) where the first coil 9a is arranged and the salient pole 61b (main pole) where the second coil 9b is arranged. ), When the center in the circumferential direction of one salient pole is between the S and N poles, that is, the boundary between the S and N poles, the center in the circumferential direction of the other salient pole is the S pole. Are arranged so as to face the center in the circumferential direction or the center in the circumferential direction of the N pole. More specifically, in this embodiment, the number of salient poles 61 is six, and in the magnet 50, four pairs of S poles and N poles are formed, so that the angular position in the circumferential direction is 112.5 °. The shifted two salient poles 61f and 61b are used as main poles, and the other salient poles 61a, 61c, 61d and 61e are complementary poles in which the coil 9 is not disposed. Note that the angular positions of the salient poles 61f and 61b are shifted by 112.5 ° means that the circumferential center of the salient pole 61f and the circumferential center of the salient pole 61b are shifted by 112.5 ° in the angular position. Means that

  Further, in this embodiment, each interval between the salient poles 61 adjacent in the circumferential direction is 56.25 °, 56.25 °, 67.5 ° clockwise from the salient pole 61a toward the FIG. 67.5 °, 56.25, and 56.25 °.

  Thus, in the motor apparatus 100 of this embodiment, in the motor 1, the magnet 50 has four pairs of S poles and N poles formed at equal angular intervals, and the stator core 60 has six salient poles 61. In such a configuration, if the salient poles 61 are arranged at equal angular intervals, an excitation torque sufficient for the rotation of the rotor 5 cannot be obtained. However, in the stator core 60, the coil 9 is wound out of the plurality of salient poles 61. In the salient poles 61f and 61b, when the circumferential center of one salient pole faces between the S pole and the N pole, the circumferential center of the other salient pole is the circumferential center of the S pole or N It arrange | positions so that the center of the circumferential direction of a pole may be opposed. For this reason, an excitation torque sufficient for the rotation of the rotor 5 can be obtained.

  Moreover, when the change of the detent torque with respect to the electrical angle was verified with respect to the motor 1 used in the motor device 100 of this embodiment, when the intervals between the salient poles 61 adjacent in the circumferential direction were set to the above-described conditions, the detent torque Small change. For this reason, in the motor apparatus 100 of this embodiment, there is little vibration of the rotor 5. Therefore, the sound generated when the rotor 5 rotates can be reduced, and the noise can be reduced. Moreover, the lifetime reduction of the bearing part (part which supports the rotating shaft 51 in the case 2) with respect to the rotating shaft 51 of the rotor 5 can be suppressed.

(Configuration of air gap between salient pole 61 and magnet 50)
FIG. 4 is an explanatory view schematically showing an air gap between the salient pole 61 and the magnet 50 in the motor 1 used in the motor apparatus 100 according to Embodiment 1 of the present invention.

  In the present embodiment, as shown in FIG. 4, two salient poles 61f and 61b located in the first angle range θ1 of less than 180 ° among the plurality of salient poles 61 are respectively main coils with the coil 9 disposed around them. It is considered as a pole. On the other hand, of the plurality of salient poles 61, a virtual bisector La that bisects the first angle range θ1 on the side opposite to the side where the two salient poles 61f and 61b (main poles) are located. The salient poles 61c, 61d, 61e positioned in the second angle range θ2 of 180 ° centered on the extended line Lb of the first coil are the first auxiliary poles around which the coil 9 is not disposed. Further, the salient pole 61a located between the salient poles 61f and 61b is a second auxiliary pole where the coil 9 is not disposed.

  In this embodiment, the structure of the air gap in which the tip portions 610f and 610b of the main pole (the salient poles 61f and 61b) are opposed to the peripheral surface of the magnet 50, and the tip portion of the first complementary pole (the salient poles 61c, 61d and 61e). 610c, 610d, and 610e are different from the structure of the air gap facing the peripheral surface of the magnet 50.

  More specifically, the areas of the tip portions 610a to 610f of the six salient poles 61 are the same, and the opposing areas of the tip portions 610a to 610f of the six salient poles 61 and the magnet 50 are the same. The first gap g1 between the tip portions 610f and 610b of the salient poles 61f and 61b and the outer peripheral surface of the magnet 50, and the tip portions 610c, 610d and 610e of the first complementary pole (the salient poles 61c, 61d and 61e) and the magnet. The second gap g2 with respect to the outer peripheral surface of 50 is different. In this embodiment, the gaps between the tip portions 610f, 610b of the main poles (the salient poles 61f, 61b) and the outer peripheral surface of the magnet 50 are all the first gap g1, and the first auxiliary poles (the salient poles 61c, 61d, 61e). The gaps between the tip portions 610c, 610d, and 610e of () and the outer peripheral surface of the magnet 50 are all the second gap g2, and the first gap g1 and the second gap g2 are different. In the present embodiment, the virtual circle C in which the tip portions 610c, 610d, and 610e of the first complementary pole (the salient poles 61c, 61d, 61e) are inscribed in the tip portions 610f, 610b of the two main poles (the salient poles 61f, 61b). The first interval g1 is narrower than the second interval g2.

  For this reason, the magnetic attraction force between the magnet 50 and the main pole (the salient poles 61f and 61b) is different from the magnetic attraction force between the magnet 50 and the first auxiliary pole (the salient poles 61c, 61d and 61e). The magnetic attraction force between the magnet 50 and the main pole (saliency poles 61f, 61b) is larger than the magnetic attraction force between the magnet 50 and the first auxiliary pole (saliency poles 61c, 61d, 61e). It is.

  In this embodiment, a salient pole 61a (second auxiliary pole) in which the coil 9 is not disposed is provided between the two main poles (surge poles 61f and 61b). The clearance between the tip portion 610a of the salient pole 61a and the outer peripheral surface of the magnet 50 is the first interval g1, and the clearance between the tip portions 610f and 610b of the main pole (the salient poles 61f and 61b) and the outer peripheral surface of the magnet 50. It is equal to (first interval g1). For this reason, the magnetic attraction force between the magnet 50 and the second auxiliary pole (the salient pole 61a) is larger than the magnetic attraction force between the magnet 50 and the first auxiliary pole (the salient poles 61c, 61d, 61e).

  Therefore, as will be described below with reference to FIG. 5, the rotor 5 has received a side pressure (indicated by an arrow F) toward the first angle range θ1 where the main poles (the salient poles 61f and 61b) are located. Rotate in state. Therefore, since the vibration of the rotor 5 is small, the sound generated when the rotor 5 is rotated can be reduced, and the noise can be reduced. Further, since the vibration of the rotor 5 is small, it is possible to suppress a decrease in the life of the bearing portion (the portion supporting the rotary shaft 51 in the case 2) of the rotor 5 with respect to the rotary shaft 51.

(Evaluation results)
FIG. 5 is a graph showing the evaluation results of the radial force (side pressure) received by the rotor 5 in the motor 1 used in the motor apparatus 100 according to Embodiment 1 of the present invention. In FIG. 5A, in all salient poles 61, the amount when the interval of the first interval g1 is narrowed from the state where the interval with the outer peripheral surface of the magnet 50 is equal is the minus (−) eccentric distance, The amount when the first gap g1 is widened is defined as a positive (+) eccentric distance, and the eccentric distance and the force that the rotor 5 receives in the direction of the bisector La (Y direction) of the first angle range θ1. It is a graph which shows the relationship with (radial direction force). In this graph, when the side pressure acts on the first angle range θ1, the radial direction force is positive, and when the side pressure acts on the second angle range θ2, the radial direction force is negative. .

  FIG. 5B shows an electromagnetic force acting on the rotor 5 during one rotation of the rotor 5 when the eccentric distance is −0.05 mm in FIG. Lissajous shows the force received in the direction of the bisector (Y direction) as the vertical axis and the force received in the direction (X direction) perpendicular to the bisector La direction (Y direction) of the first angle range θ1 as the horizontal axis. FIG. FIG. 5C shows an electromagnetic force acting on the rotor 5 during one rotation of the rotor 5 in the first angular range θ1 when the eccentric distance is 0 mm in FIG. Lissajous shows the force received in the direction of the segment La (Y direction) as the vertical axis and the force received in the direction (X direction) perpendicular to the bisector direction (Y direction) of the first angle range θ1 as the horizontal axis. FIG.

  In FIG. 5A, the value indicated by the solid line LMAX corresponds to the maximum value in the Lissajous diagram as shown in FIGS. 5B and 5C, and the value indicated by the solid line LMIN is shown in FIGS. It corresponds to the minimum value in the Lissajous diagram as shown in c), and the value shown by the solid line LAVE corresponds to the average value of the results obtained in the above Lissajous diagram.

As can be seen from the result of the eccentric distance shown in FIG. 5A being 0 mm and the result shown in FIG. 5C, the rotors in all salient poles 61 have the same spacing as the outer peripheral surface of the magnet 50. The direction of the force applied to 5 is reversed. On the other hand, as can be seen from the result that the eccentric distance shown in FIG. 5A is −0.05 mm and the result shown in FIG. From the state where the interval is equal, the interval of the first interval g1 is 0.05 mm
When narrowed, a force on the side where the first angle range θ1 is always applied is applied to the rotor 5, and the direction of the applied force is not reversed. Therefore, vibration of the rotor 5 can be suppressed.

  Further, when the interval of the first interval g1 is narrowed, the reversal of the direction of the force applied to the rotor 5 can be prevented with a relatively small eccentric amount of 0.05 mm. On the other hand, when the interval of the first interval g1 is widened, in order to prevent reversal of the direction of the force applied to the rotor 5, a relatively large eccentricity amount that widens the interval of the first interval g1 by 0.17 mm is used. I need. As a result, there is a drawback that the torque with respect to the rotor 5 is reduced. On the other hand, in the configuration in which the interval of the second interval g2 is narrowed by 0.17 mm, a foreign object is caught between the magnet 50 and the first complementary pole (the salient poles 61c, 61d, 61d), and the rotation of the rotor 5 is hindered. There is a risk. Therefore, it can be said that the configuration in which the interval of the first interval g1 is narrowed is preferable.

[Modification of Embodiment 1]
FIG. 6 is an explanatory view schematically showing an air gap between the salient pole 61 and the magnet 50 in the motor 1 used in the motor apparatus 100 according to Embodiment 1 of the present invention. Since the basic configuration of this embodiment is the same as that of the embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

  As can be seen from the results shown in FIG. 5A, in order to prevent the reversal of the direction of the force applied to the rotor 5, the second interval g2 may be narrower than the first interval g1, As shown in FIG. 6, the tip portions 610c, 610d, and 610e of the first complementary pole (the salient poles 61c, 61d, and 61e) are inscribed in the tip portions 610f and 610b of the two main poles (the salient poles 61f and 61b). It is inside the circle C in the radial direction.

  For this reason, the magnetic attraction force between the magnet 50 and the main pole (the salient poles 61f and 61b) is different from the magnetic attraction force between the magnet 50 and the first auxiliary pole (the salient poles 61c, 61d and 61e). The magnetic attraction force between the magnet 50 and the first auxiliary pole (the salient poles 61c, 61d, 61e) is larger than the magnetic attraction force between the magnet 50 and the main pole (the salient poles 61f, 61b). It is. Further, in this embodiment, the gap between the tip 610a of the second auxiliary pole (the salient pole 61a) and the outer peripheral surface of the magnet 50 is the first interval g1, and the tip 610f of the main pole (the salient poles 61f and 61b) It is equal to the gap (first interval g1) between 610b and the outer peripheral surface of the magnet 50. For this reason, the magnetic attraction force between the magnet 50 and the first complementary pole (the salient poles 61c, 61d, 61e) is larger than the magnetic attraction force between the magnet 50 and the second auxiliary pole (the salient pole 61a).

  Therefore, the rotor 5 rotates in a state where it receives a side pressure (indicated by an arrow F) directed to the opposite side to the first angle range θ1 where the main pole (the salient poles 61f and 61b) is located. Therefore, since the vibration of the rotor 5 is small, the sound volume generated when the rotor 5 is rotated can be reduced, and the noise can be reduced.

[Embodiment 2]
FIG. 7 is an explanatory view schematically showing an air gap between the salient pole 61 and the magnet 50 in the motor 1 used in the motor apparatus 100 according to Embodiment 2 of the present invention. Since the basic configuration of this embodiment is the same as that of the embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 7, in this embodiment, when the first gap g1 is narrower than the second gap g2, the tip portions 610c, 610d, 610e, and the second auxiliary poles of the first complementary poles (the salient poles 61c, 61d, 61e) are used. The tip end portion 610a of the pole (the salient pole 61a) is located on a virtual circle C inscribed in the tip portions 610f and 610b of the two main poles (the salient poles 61f and 61b), but the rotation center axis L0 of the rotor 5 is virtual It is shifted from the center Co of the circle C in a direction approaching the two main poles (the salient poles 61f and 61b). In this embodiment, the rotation center axis L0 of the rotor 5 is shifted from the center Co of the virtual circle C by the dimension R on the bisector La on the side where the second supplemental pole (the salient pole 61a) is located.

  In such a configuration, the second gap g2 between the tip end portions 610c, 610d, 610e of the first complementary pole (the salient poles 61c, 61d, 61e) and the outer peripheral surface of the magnet 50 is the first complementary pole (the salient poles 61c, 61d, 61e). 61e). In addition, the first gap g1 between the main pole (the salient poles 61f and 61b) and the outer peripheral surface of the magnet 50 is the same in the two main poles (the salient poles 61f and 61b), but the second auxiliary pole (the salient pole 61a). ) And the outer peripheral surface of the magnet 50 is different from the gap g3. Still, the first interval g1 and the third interval g3 are narrower than the second interval g2. For this reason, the magnetic attraction force between the magnet 50 and the main pole (the salient poles 61f, 61b) is larger than the magnetic attraction force between the magnet 50 and the first auxiliary pole (the salient poles 61c, 61d, 61e). is there.

  Further, in this embodiment, the interval g3 between the tip 610a of the second auxiliary pole (the salient pole 61a) and the outer peripheral surface of the magnet 50 is narrower than the first interval g1 and narrower than the second interval g2. For this reason, the magnetic attraction force between the magnet 50 and the second auxiliary pole (the salient pole 61a) is larger than the magnetic attraction force between the magnet 50 and the first auxiliary pole (the salient poles 61c, 61d, 61e).

  Therefore, as in the first embodiment, the rotor 5 rotates in a state where it receives a side pressure (indicated by the arrow F) toward the first angle range θ1 where the main poles (the salient poles 61f and 61b) are located. Therefore, since the vibration of the rotor 5 is small, it is possible to reduce the sound generated when the rotor 5 is rotated, and to achieve an effect of reducing noise.

[Modification of Embodiment 2]
FIG. 8 is an explanatory view schematically showing an air gap between the salient pole 61 and the magnet 50 in the motor 1 used in the motor apparatus 100 according to the modification of the second embodiment of the present invention. Since the basic configuration of this embodiment is the same as that of the embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 8, in this embodiment, when the second gap g2 is narrower than the first gap g1, the tips 610c, 610d, 610e, and the second auxiliary poles of the first complementary poles (the salient poles 61c, 61d, 61e) are used. The tip end portion 610a of the pole (the salient pole 61a) is located on a virtual circle C inscribed in the tip portions 610f and 610b of the two main poles (the salient poles 61f and 61b), but the rotation center axis L0 of the rotor 5 is virtual. It is shifted from the center Co of the circle C in a direction away from the two main poles (the salient poles 61f and 61b). In this embodiment, the rotation center axis L0 of the rotor 5 is shifted by the dimension R from the center Co of the virtual circle C on the extension line Lb of the bisector La to the side where the first supplemental pole (the salient pole 61d) is located. ing.

  In such a configuration, the second gap g2 between the tip end portions 610c, 610d, 610e of the first complementary pole (the salient poles 61c, 61d, 61e) and the outer peripheral surface of the magnet 50 is the first complementary pole (the salient poles 61c, 61d, 61e). 61e). In addition, the first gap g1 between the main pole (the salient poles 61f and 61b) and the outer peripheral surface of the magnet 50 is the same in the two main poles (the salient poles 61f and 61b), but the second auxiliary pole (the salient pole 61a). ) And the outer peripheral surface of the magnet 50 is different from the gap g3. Nevertheless, the second interval g2 is narrower than the first interval g1 and the third interval g3. For this reason, the magnetic attraction between the magnet 50 and the first auxiliary poles (the salient poles 61c, 61d, 61e) is larger than the magnetic attraction between the magnet 50 and the main poles (the salient poles 61f, 61b). .

  In the present embodiment, the distance g3 between the tip 610a of the second auxiliary pole (the salient pole 61a) and the outer peripheral surface of the magnet 50 is wider than the first gap g1 and wider than the second gap g2. For this reason, the magnetic attraction force between the magnet 50 and the first complementary pole (the salient poles 61c, 61d, 61e) is larger than the magnetic attraction force between the magnet 50 and the second auxiliary pole (the salient pole 61a).

  Therefore, as in the modification of the first embodiment, the rotor 5 receives a side pressure (indicated by an arrow F) that is directed to the opposite side of the first angle range θ1 where the main poles (the salient poles 61f and 61b) are located. Rotate in the state. Therefore, since the vibration of the rotor 5 is small, it is possible to reduce the sound generated when the rotor 5 is rotated, and to achieve an effect of reducing noise.

[Embodiment 3]
FIG. 9 is an explanatory view schematically showing an air gap between the salient pole 61 and the magnet 50 in the motor 1 used in the motor apparatus 100 according to Embodiment 3 of the present invention. Since the basic configuration of this embodiment is the same as that of the embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 9, in this embodiment, the magnet 50 is provided with S poles and N poles on the outer peripheral surface alternately at equal angular intervals in the circumferential direction. In this embodiment, in the magnet 50, five pairs of S poles and N poles are formed. For this reason, in the magnet 50, since the S pole and the N pole are formed at equal angular intervals, a total of 10 poles, the angular positions of the S pole and the N pole adjacent in the circumferential direction are shifted by 36 °. .

  In the stator core 60, three salient poles 61 are formed at equal angular intervals in the circumferential direction, and the angular positions of the salient poles 61 adjacent in the circumferential direction are shifted by 120 °.

  In the stator core 60 configured in this manner, of the three salient poles 61, the two salient poles 61a and 61b located in the first angle range θ1 of less than 180 ° are used as main poles on which the coil 9 is disposed. Is done. In this embodiment, the two salient poles 61a and 61b are formed in a first angle range θ1 of 120 °. On the other hand, of the plurality of salient poles 61, a virtual bisector La that bisects the first angle range θ1 on the side opposite to the side where the two salient poles 61a and 61b (main poles) are located. The salient pole 61c located in the second angle range θ2 of 180 ° centered on the extended line Lb is a first complementary pole in which the coil 9 is not disposed. In this embodiment, since there are three salient poles 61, there is no complementary pole (second complementary pole) between the two main poles (the salient poles 61a and 61b). For this reason, in the connection part 65, it cut | disconnects in the part pinched | interposed into two main poles (salient pole 61a, 61b), and the discontinuous part 69 is formed.

  Also in the motor 1 configured as described above, the first gap g1 between the front end portions 610a and 610b of the main poles (the salient poles 61a and 61b) and the outer peripheral surface of the magnet 50, and the front end of the first auxiliary pole (the salient pole 61c). The second gap g2 between the portion 610c and the outer peripheral surface of the magnet 50 is different. In this embodiment, the first interval g1 is narrower than the second interval g2. For this reason, as in the first embodiment, the rotor 5 rotates in a state of receiving a side pressure (indicated by an arrow F) toward the first angle range θ1 where the main poles (the salient poles 61f and 61b) are located. Therefore, since the vibration of the rotor 5 is small, the sound volume generated when the rotor 5 is rotated can be reduced, and the noise can be reduced.

[Embodiment 4]
FIG. 10 is an explanatory view schematically showing an air gap between the salient pole 61 and the magnet 50 in the motor 1 used in the motor apparatus 100 according to Embodiment 4 of the present invention. Since the basic configuration of this embodiment is the same as that of the embodiment, common portions are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 10, in this embodiment, the magnet 50 is provided with S poles and N poles on the outer peripheral surface alternately at equal angular intervals in the circumferential direction. In this embodiment, the magnet 50 has four pairs of S poles and N poles. For this reason, in the magnet 50, since the S pole and the N pole are formed at equal angular intervals, a total of 8 poles, the angular positions of the S pole and the N pole adjacent in the circumferential direction are shifted by 45 °. .

  Ten salient poles 61 are formed in the stator core 60 at equal angular intervals in the circumferential direction, and the angular positions of the salient poles 61 adjacent in the circumferential direction are shifted by 36 °.

  In this embodiment, of the ten salient poles 61, the two salient poles 61e and 61g located in the first angle range θ1 of less than 180 ° are used as main poles on which the coil 9 is disposed. In this embodiment, the two salient poles 61e and 61g are formed in a first angle range θ1 of 72 °. In this embodiment, since the angle formed by the two main poles (the salient poles 61e and 61g) is narrow, when the coil bobbin 7 is attached to the main pole (the salient poles 61e and 61g), the first gear 41 shown in FIG. There is no space to do. Therefore, in this embodiment, the main poles (the salient poles 61e and 61g) are located on the opposite side of the first gear 41 shown in FIG. 1 with respect to the rotation center axis L0.

  On the other hand, of the plurality of salient poles 61, an extension of a virtual bisector La that bisects the first angle range θ1 on the side opposite to the side where the two salient poles 61e and 61g (main poles) are located. The salient poles 61a, 61b, 61c, 61i, 61i positioned in the second angle range θ2 of 180 ° centered on Lb are first complementary poles around which the coil 9 is not disposed. The stator core 60 is provided with a salient pole 61f (second auxiliary pole) in which the coil 9 is not disposed between the two salient poles 61e and 61g (main pole). The stator core 60 is formed with salient poles 61d and 61h (third auxiliary poles) between which the coil 9 is not disposed between the first angle range θ1 and the second angle range θ2.

  Also in the motor 1 configured as described above, the first gap g1 between the front end portions 610e and 610g of the main poles (the salient poles 61e and 61g) and the outer peripheral surface of the magnet 50, and the first complementary pole (the salient poles 61a and 61b, 61 c, 61 i, 61 i) is different from the tip end 610 a, 610 b, 610 c, 610 i, 610 i) and the second gap g 2 between the outer peripheral surface of the magnet 50. In this embodiment, the first interval g1 is narrower than the second interval g2.

  In addition, the distance between the tip 610f of the second auxiliary pole (the salient pole 61f) and the outer peripheral surface of the magnet 50 is narrower than the second distance g2. It should be noted that the distance between the tips 610d and 610h of the third complementary pole (the salient poles 61d and 61h) and the outer peripheral surface of the magnet 50 is equal to the second distance g2.

  Even in such a configuration, as in the first embodiment, the rotor 5 is subjected to a side pressure (indicated by an arrow F) toward the first angle range θ1 where the main poles (the salient poles 61e and 61g) are located. Rotate. Therefore, since the vibration of the rotor 5 is small, the sound volume generated when the rotor 5 is rotated can be reduced, and the noise can be reduced.

[Other embodiments]
In the first to fourth embodiments, the distance between the tip end of the main pole and the outer peripheral surface of the magnet 50 is the same in the two main poles, but the tip end of the main pole and the magnet 50 in the two main poles. You may employ | adopt the structure from which the space | interval with the outer peripheral surface differs.

  In the first and second embodiments, the intervals between the tip of the first complementary pole and the outer peripheral surface of the magnet 50 are the same in the plurality of first complementary poles. You may employ | adopt the structure from which the space | interval of the front-end | tip part of 1 complement pole and the outer peripheral surface of the magnet 50 differs.

  In the above embodiment, the example in which the motor device 100 is applied to the pointer-type display device 200 has been described. However, the present invention may be applied to a device other than the motor device 100 for the pointer-type display device.

1 .. Motor 5. Rotor 6. Stator 7. Coil bobbin 9. Coil 10.. Output shaft (output member)
50 ·· Magnet 60 · · Stator core 61, 61a to 61j · · Salient pole 100 · · Motor device 200 · · Pointer-type display device θ1 · · First angle range θ2 · · Second angle range L0 · · Rotor rotation center Axis line La .. Bisect Lb .. Extension of bisector

Claims (9)

A rotor provided with magnets in which S poles and N poles are alternately provided in the circumferential direction;
A stator core in which a plurality of salient poles whose tip portions are opposed to each other with a gap on the outer circumferential surface of the magnet are arranged in the circumferential direction;
A coil disposed around each of two main poles located in a first angle range of less than 180 ° of the plurality of salient poles;
Have
Of the plurality of salient poles, a second 180 ° centered on an extension of a virtual bisector that bisects the first angle range on the side opposite to the side where the two main poles are located. The salient pole located in the angular range is the first complementary pole in which the coil is not disposed around,
The motor is characterized in that the first interval between the tip of the main pole and the outer peripheral surface of the magnet is different from the second interval between the tip of the first auxiliary pole and the outer peripheral surface of the magnet. .   The motor according to claim 1, wherein the first interval is narrower than the second interval. Between the two main poles, there is a second complementary pole without a coil arranged around,
3. The motor according to claim 2, wherein a distance between a tip portion of the second complementary pole and an outer peripheral surface of the magnet is narrower than the second distance.   The motor according to claim 1, wherein the second interval is narrower than the first interval. Between the two main poles, there is a second complementary pole without a coil arranged around,
5. The motor according to claim 4, wherein the second interval is narrower than an interval between a tip portion of the second complementary pole and an outer peripheral surface of the magnet.   The front end of the first complementary pole is located on the radially outer side or the radially inner side of a virtual circle inscribed in the front ends of the two main poles. The motor described. The tip of the first complementary pole is located on a virtual circle inscribed in the tip of the two main poles,
The rotation center of the rotor is shifted from the center of the virtual circle in a direction approaching the two main poles or in a direction separating from the two main poles. The motor according to item. A motor device comprising the motor according to any one of claims 1 to 7,
A train wheel for transmitting rotation of the rotor;
An output member to which rotation of the rotor is transmitted via the wheel train;
The motor apparatus characterized by having. A pointer-type display device using the motor device according to claim 8,
A pointer-type display device, wherein a pointer is driven by the output member.

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