JP2010172096A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slotless structure of a motor, capable of achieving high reliability even if the footprint of the coil is increased by reliably ensuring inter-phase insulation or insulation between a coil and a stator core. <P>SOLUTION: The motor has a rotor in which a centrally wound coil is arranged on the outer circumferential side, and a cylindrical stator core which is arranged on the outside of the coil and has no throttle. A coil bobbin 1 is made of an insulative non-magnetic material and is formed in a cylinder shape and arranged between the rotor and the stator core, first protrusions 2 whose number is the same as the number of coils, and which protrude in the radius direction and extend in an axial direction are provided on the outer circumference of the cylinder, the coils are inserted into the first protrusions, second protrusions 3 are formed between the adjacent coils from the outer circumference of the cylinder, and the outer circumference is covered with an insulative layer after the coils are inserted into the coil bobbin 1 and assembled. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a slotless structure of a rotor for a motor for high speed rotation.

  FIG. 6 shows a conventional slotless structure of a motor rotor. The coil bobbin 23 has a plurality of projecting portions 24 projecting radially from a cylindrical outer periphery at equal angles in the circumferential direction. An air-core coil (not shown) previously formed by concentrated winding and using self-bonding wires is arranged on the protruding portion 24 of the coil bobbin 23.

The coil bobbin 23 is inserted into a cylindrical stator core (not shown) having an inner diameter larger than the coil bobbin 23 (see, for example, Patent Document 1).
JP 2002-262502 A

  However, in the conventional configuration, when the space factor is increased, interphase insulation and insulation between the coil and the stator core are not reliably ensured by the insulating member, so that there is a problem that reliability is lowered. It was.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a slotless structure that can ensure interphase insulation and insulation between a coil and a stator core with an insulating member.

  In order to solve the above-described conventional problems, the slotless structure of the present invention has coil bobbin protrusions also provided between concentrated winding coils, and the coil bobbin is inserted and assembled to cover the outer periphery with an insulating layer. The arrangement is as follows.

  Accordingly, interphase insulation and insulation between the coil and the stator core can be reliably ensured, and high reliability can be realized even if the space factor of the coil is increased.

  The motor having the slotless structure of the present invention can be miniaturized while having high efficiency.

  A first invention includes a rotor in which concentrated winding coils are arranged on the outer peripheral side, and a cylindrical stator core without a throttle arranged outside the coils, and the coil bobbin holding the coils has an insulating property. A cylindrical shape made of a non-magnetic material is disposed between the rotor and the stator core, and protrudes in the radial direction as many as the number of the coils on the outer periphery of the cylindrical shape and extends in the axial direction. There is one protrusion, the coil is inserted into this, and a second protrusion is formed from the outer periphery of the cylindrical shape between adjacent coils, and the outer periphery is insulated after the coil is inserted into the coil bobbin and assembled. Therefore, the insulation between the phases can be reliably performed by the protrusions of the coil bobbin, and the insulation between the coil and the stator core can be reliably performed by the insulating layer covering the outer periphery of the coil bobbin.

In the second invention, in particular, in the first invention, the insulating layer is an insulating sheet, and the insulating sheet has its edge or a bent edge inserted into a slit provided at the tip of each projection of the coil bobbin. Therefore, it is possible to ensure high reliability that a portion with weak insulation such as a pinhole is unlikely to occur.

  In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  According to a third aspect of the invention, in particular, in the second aspect of the invention, there is only one insulating sheet, which is formed so as to cover the outer periphery of the coil bobbin. Since it is easy to arrange, the reliability of insulation between the coil and the stator core can be increased.

  In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  In a fourth aspect of the invention, particularly in the second aspect of the invention, the number of insulating sheets is the same as the number of coils, and the edge inserted into the slit provided at the tip of the projection of the coil bobbin of the adjacent insulating sheet is separated. By arranging, it is easy to take a long creepage distance between the phases, so that the reliability can be increased. In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  According to a fifth aspect of the invention, in particular, in the first aspect of the invention, the cylindrical axial direction of the coil bobbin extends to at least a height equal to or higher than the height of the coil end of the coil. It is difficult to secure the insulation distance and contact with the rotor.

  Further, since reliable insulation can be ensured and the coil end can be protected, it is possible to reduce the size and increase the efficiency by improving the space factor.

  According to a sixth aspect of the invention, in particular, in the first aspect of the invention, the insulating layer is made of an insulating cylindrical member, so that the coil and the stator core can be insulated completely without pinholes. Reliability can be obtained.

  In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  In a seventh aspect based on the first aspect, the insulating layer is made of an insulating thread wound around the outer periphery of the coil bobbin and a resin. As a result, the resin can ensure a certain thickness or more, and insulation between the coil and the stator core as well as between the phases can be surely obtained, and high reliability can be obtained.

  In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  According to an eighth aspect of the invention, particularly in the first aspect of the invention, the insulating layer is composed of an uneven ring disposed on the outer periphery of the coil bobbin and a resin, and there is no need to wind a thread-like member. Since the ring is easier to obtain higher rigidity, the coil bulge can be pressed down more reliably.

  As a result, the resin can ensure a certain thickness or more, and the insulation between the coil and the stator core as well as between the phases can be ensured, and high reliability can be obtained.

  In the ninth invention, in particular, in any one of the first to eighth inventions, the coil and the coil bobbin are formed of a resin, thereby suppressing noise from the coil due to electromagnetic vibration during driving of the motor and reducing heat from the coil. Since it can be transmitted efficiently, it is advantageous for heat dissipation.

  In addition, since the coil end is covered with the resin and is hardly damaged and can be reliably insulated, the reliability can be improved.

  In a tenth aspect of the invention, any one of the first to ninth motors is used as a drive source of an electric blower. In an eleventh aspect of the invention, the electric blower of the tenth aspect is mounted on a vacuum cleaner. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
As shown in FIG. 1, the coil bobbin 1 made of a non-magnetic material that is insulative has the same number of first protrusions 2 protruding in the radial direction as the number of concentrated winding coils (not shown) in the axial direction. In addition, a second protrusion 3 is formed between the first protrusions 2 and protrudes in the radial direction in the axial direction.

  The second protrusion 3 has a trapezoidal cross-sectional shape, and its inclined surface is substantially perpendicular to the radial direction of the adjacent first protrusion 2.

  As a result, the coil bobbin 1 can be directly wound.

  Two slits are provided at the tips of the first protrusion 2 and the second protrusion 3, and the edge of the insulating sheet 4 is inserted between the slits of the adjacent protrusions.

  The insulating sheet 4 is formed so as to cover the outer periphery of the coil bobbin 1, and is fixed by welding, adhesion, caulking or the like at the slits of the first protrusion 2 and the second protrusion 3.

  Thereby, the axial direction part of the coil of the concentrated winding with which the 1st projection part 2 is mounted | worn can be completely covered with the coil bobbin 1 and the insulating sheet 4, and a coil is pressed so that the space factor of a coil may be improved. Therefore, the insulating sheet 4 can be fixed.

  Moreover, it becomes possible to take the creeping distance between adjacent coils long by inserting the edge of the adjacent insulating sheet 4 in the different slit of each projection part.

  Accordingly, interphase insulation and insulation between the coil and the stator core can be reliably ensured, and high reliability can be realized even if the space factor of the coil is increased. As a result, the space factor can be further improved, so that the motor can be made smaller and more efficient.

  Although the two slits provided at the tip of the protrusion are shown, each insulating sheet may be fixed to each of the side surfaces of the tip of the protrusion, and the edge of the insulating sheet adjacent to one slit does not contact. Thus, it may be inserted through an insulator.

(Embodiment 2)
FIG. 2 shows the second embodiment, and the same reference numerals are given to the components that perform the same operations as those in FIG.

  In the present embodiment, the insulating sheet 5 is composed of a single sheet, and the edge thereof is fixed by a slit provided at the tip of the first protrusion 2.

  Bending edges of the insulating sheet 5 are inserted into and fixed to the slits of the other first protrusions 2 and the second protrusions 3.

  The entire insulating sheet 5 is disposed so as to cover the outer periphery of the coil bobbin 1.

  The insulating sheet 5 only needs to be bent, and furthermore, since the insulating sheet 5 can be disposed on the outer peripheral side of the coil bobbin 1 without a gap, the reliability of insulation between the coil (not shown) and the stator core (not shown). Therefore, even if the space factor of the coil is increased, high reliability can be realized.

  As a result, the space factor can be further improved, so that the motor can be made smaller and more efficient.

(Embodiment 3)
FIG. 3 shows Embodiment 3, and the same code | symbol is attached | subjected to the component which performs the same effect | action as FIG. 1, and the thing of Embodiment 1 is used for concrete description.

  In the present embodiment, the insulating layer provided between the outer peripheral side of the coil bobbin 1 and the inner diameter side of the stator core (not shown) is composed of the insulating cylindrical insulating tube 6. The protrusion 2 and the insulating tube 6, and the second protrusion 3 and the insulating tube 6 are fitted and fixed.

  This makes it possible to prevent interphase insulation and coil collapse (not shown), and can completely insulate the coil from the stator core without pinholes, thereby obtaining high reliability. .

  As a result, since reliable insulation can be ensured, it becomes possible to reduce the size and increase the efficiency by improving the space factor.

  Moreover, the 2nd projection part 3 provides the part which can bend flexibly by providing a thin part in the base vicinity.

  By bending the tip of the second protrusion 3 toward the side away from the first protrusion 2 on which the coil is mounted, the first protrusion 2 can be directly wound by a winding machine.

(Embodiment 4)
FIG. 4 shows a fourth embodiment of the present invention, in which a concentrated winding coil 7 is arranged on a first protrusion 2 that protrudes in the radial direction from the outer peripheral surface of the cylindrical portion 6 on the inner diameter side of the coil bobbin 1 and extends in the axial direction. In addition, there are a plurality of grooves 8 on the outer peripheral side end face of the first protrusion 2, and the insulating yarn 9 is wound along the grooves 8 so that the coil 7 does not protrude outward from the outer periphery of the coil bobbin 1. Has been.

  A second protrusion (not shown) provided between the coils 7 has the same shape as that of the first protrusion 2, and an insulating thread is wound along a groove on the end surface.

  In this state, the outer peripheral side of the coil bobbin 1 is covered with resin by molding, casting, impregnation, coating, varnish treatment, or the like.

The cylindrical portion 6 on the inner diameter side of the coil bobbin 1 extends in the axial direction to at least equal to or higher than the height of the coil end of the coil 7.

  As a result, the shape of the coil end on the inner diameter side does not collapse, and the insulation distance from the rotor (not shown) is not secured or contacted.

  Further, by integrally forming the coil bobbin 1 and the coil 7 including the coil end and the stator core (not shown), noise from the coil 7 due to electromagnetic vibration during driving of the motor is suppressed, and heat from the coil 7 is suppressed. Can be transmitted efficiently, which is advantageous for heat dissipation.

  In addition, since the coil end is covered with the resin and is hardly damaged and can be reliably insulated, the reliability can be improved. In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  Although the coil bobbin 1 and the coil 7 are shown as being integrally molded, the same effects can be obtained even if they are used in other embodiments.

(Embodiment 5)
FIG. 5 shows a fifth embodiment, and the same reference numerals are given to components that perform the same operations as those in FIG.

  As shown in FIG. 5, an uneven ring 10 is arranged on the outer periphery of the coil bobbin 1, and the distance between the stator core (not shown) and the coil (not shown) is ensured to be a certain value or more. Is covered with resin by molding, casting, impregnation or coating.

  Further, the first protrusion 2 and the ring 10, and the second protrusion 3 and the ring 10 are fitted and fixed.

  As a result, there is no need to wind a thread-like member that can prevent interphase insulation and coil collapse, and the ring 10 can easily obtain higher rigidity than the thread, so that the coil swells more. It can be pressed down reliably.

  As a result, the resin on the outer peripheral side of the coil bobbin 1 can ensure a certain thickness or more, and insulation between the coil and the stator core can be ensured as well as between the phases, and high reliability can be obtained. .

  In addition, since reliable insulation can be ensured, it is possible to reduce the size and increase the efficiency by improving the space factor.

  In addition, a thin portion is provided near the base of the second protrusion 3 to provide a portion that can be flexibly bent.

  By bending the tip of the second protrusion 3 toward the side away from the first protrusion 2 on which the coil is mounted, the first protrusion 2 can be directly wound by a winding machine.

  As described above, since the slotless structure according to the present invention can ensure insulation by the insulating layer covering the protrusion of the coil bobbin and the outer peripheral side of the coil bobbin, the reliability is improved, and the size is reduced by improving the space factor. High efficiency can be achieved.

Also, an electric blower having a motor using this rotor can be downsized while having high efficiency.

  Therefore, it can be widely applied to other uses such as household appliances, industrial equipment as well as vacuum cleaners. Furthermore, the electric blower can be applied to a compressor, a turbine, and a liquid pump from the same viewpoint.

Front view of motor rotor in Embodiment 1 of the present invention Front view of motor rotor according to embodiment 2 of the present invention Front view of motor rotor according to Embodiment 3 of the present invention Side view of motor rotor in embodiment 4 of the present invention Front view of motor rotor according to embodiment 5 of the present invention The conventional rotor for motors is shown, (a) is a front view, (b) is a side view.

DESCRIPTION OF SYMBOLS 1 Coil bobbin 2 1st projection part 3 2nd projection part 4,5 Insulation sheet 6 Insulation tube 7 Coil 8 Groove 9 Thread

Claims (11)

A coil bobbin that includes a rotor having a concentrated winding coil disposed on the outer peripheral side and a cylindrical stator core without a throttle disposed outside the coil, and that holds the coil is made of an insulating nonmagnetic material. A cylindrical projection is disposed between the rotor and the stator core, and on the outer periphery of the cylindrical shape, there are first projections extending in the radial direction and extending in the axial direction as many as the number of the coils. The coil is inserted, and a second protrusion is formed from the outer periphery of the cylindrical shape between adjacent coils, and the outer periphery is covered with an insulating layer after the coil is inserted into the coil bobbin and assembled. Motor. The insulating layer is an insulating sheet, and the insulating sheet is fixed by inserting an edge or a bent edge into a slit provided at the tip of each projection of the coil bobbin. motor. The motor according to claim 2, wherein one insulating sheet is formed so as to cover the outer periphery of the coil bobbin. The motor according to claim 2, wherein the number of insulating sheets is the same as the number of coils, and an edge to be inserted into a slit provided at the tip of the projection of the coil bobbin of the adjacent insulating sheet is disposed apart. 2. The motor according to claim 1, wherein the axial direction of the cylindrical shape of the coil bobbin extends at least equal to or higher than the height of the coil end of the coil. The motor according to claim 1, wherein the insulating layer is made of an insulating cylindrical member. 2. The motor according to claim 1, wherein the insulating layer is made of an insulating thread wound around the outer periphery of the coil bobbin and a resin. 2. The motor according to claim 1, wherein the insulating layer is made of a ring having an unevenness and a resin disposed on the outer periphery of the coil bobbin. The motor according to claim 1, wherein the coil and the coil bobbin are formed of resin. The electric blower which uses the motor of any one of Claims 1-9 as a drive source. The vacuum cleaner carrying the electric blower of Claim 10.