JP2010011583A - Motor and pump using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can be miniaturized in itself without miniaturizing a motor magnet. <P>SOLUTION: The claw pole type motor includes: a rotor 3 formed by fixing a magnet 2 on a rotating shaft 1; stators 6 oppositely disposed on the outside of the rotor 3 and formed by attaching a winding wire 5 on a yoke 4 for transmitting a rotating drive force to the rotor 3; and a magnetism detection sensor 7 for detecting a magnetic pole magnetized to the magnet 2. In the motor, the magnetism detection sensor 7 is provided on the stator side as a portion where the magnet 2 opposes the stators 6. Specifically, the magnetism detection sensor 7 is provided in the yoke 4 opposing the rotor 3 which is on the outside of the rotor 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor and a pump using the same.

For example, Patent Document 1 discloses a sensor-equipped stepping motor in which a sensor for detecting a magnetic pole of a rotor (rotor) is disposed at a lower position facing the lower surface of a motor magnet in the axial direction of the rotor. The sensor detects a magnetic pole (N pole or S pole) magnetized in the rotor magnet, and outputs a voltage corresponding to the detected magnetic force.
JP 2001-78392 A

  By the way, in the technique of patent document 1, since the sensor is arrange | positioned in the downward position facing a motor magnet lower surface, the length of a motor magnet on output cannot be lengthened any more by arrangement | positioning this sensor. In addition, since the motor becomes longer in the axial direction, the motor becomes larger.

  Accordingly, an object of the present invention is to provide a motor capable of reducing the size of the motor itself without reducing the motor magnet, and a pump using the motor.

  In the motor according to the present invention, a magnetism detection sensor for detecting a magnetic pole magnetized in the magnet is provided on either the rotor side or the stator side, which is a portion of the inner rotor structure or the outer rotor structure facing the magnet and the stator. ing.

  In the pump of the present invention, the motor according to the present invention is housed in a pump case having a suction port and a discharge port for sucking and discharging liquid, and the rotor is provided with an impeller.

  According to the motor of the present invention, the magnetism detection sensor is provided on the rotor side or the stator side, not in the lower position facing the lower surface of the magnet in the axial direction of the rotor, but on the rotor side or the stator side. The magnetic detection sensor can be arranged without reducing the size of the motor, and the motor itself can be downsized.

  In addition, according to the pump of the present invention, it is possible to reduce the size of the pump itself by using a motor that is advantageous for downsizing as a pump motor.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“First Embodiment”
FIG. 1 is a schematic sectional view of a claw pole type motor in the first embodiment, FIG. 2 shows a stator of the claw pole type motor of FIG. 1, (A) is a plan view of the stator, and (B) is FIG. FIG. 3A is a cross-sectional view taken along the line A-A in FIG. 1, and FIG.

  The claw pole type motor has an advantage that the structure is simple and the productivity is good and the manufacturing cost can be kept low. In this embodiment, in the claw pole type motor, the position of the magnetic detection sensor is determined and arranged as follows so that the motor itself can be reduced in size without reducing the rotor magnet.

  The claw pole type motor of the first embodiment includes a rotor 3 having a magnet 2 fixed to a rotating shaft 1, a stator 6 having a winding 5 attached to a yoke 4 that transmits a rotational driving force to the rotor 3, And a magnetic detection sensor 7 for detecting a magnetic pole magnetized on the magnet 2, and a so-called inner rotor type motor in which the stator 6 is disposed opposite to the outside of the rotor 3.

  The rotor 3 includes a rotating shaft 1 that is rotatably supported by a bearing (not shown), and a magnet 2 that is a permanent magnet fixed to the rotating shaft 1. The magnet 2 has, for example, a cylindrical shape in which the rotary shaft 1 is inserted at the center, and N poles and S poles are alternately magnetized sequentially in the circumferential direction on the outer surface 2a to constitute a magnetic circuit (magnetic flux). The magnet 2 is fixed to the rotary shaft 1 with a connecting member 8 provided at the center of the inner surface 2b of the rotary shaft 1. The rotor 3 rotates around the rotating shaft 1 in response to electromagnetic force generated by energizing the winding 5 provided in the stator 6.

  The stator 6 includes a yoke 4 having a claw magnetic pole (claw pole) 9, a winding 5 attached to the yoke 4, and a bobbin 10 around which the winding 5 is wound. The yoke 4 is composed of a first yoke 4A and a second yoke 4B each having a ring shape in plan view that constitutes a pair at the top and bottom, and winding them wound around the bobbin 10 inside by combining them in the up and down direction. A winding accommodating space in which 5 is disposed is formed.

  A plurality of claw magnetic poles 9 are formed on the yoke 4. In the present embodiment, four claw magnetic poles 9 are formed on the first yoke 4A, and four claw magnetic poles 9 are also formed on the second yoke 4B. The claw magnetic poles 9 formed on the first yoke 4A and the claw magnetic poles 9 formed on the second yoke 4B are alternately arranged with their positions shifted.

  The winding 5 is wound around the bobbin 10 and disposed in the winding accommodating space. The winding 5 generates a magnetic field when energized, and efficiently transmits the magnetic field from the claw magnetic pole 9 to the rotor 3. The magnetic field generated by energizing the winding 5 is controlled by a driving substrate (control circuit unit) (not shown).

The magnetic detection sensor 7 is detection means for detecting the N pole or the S pole magnetized on the outer surface 2 a of the magnet 2. The magnetic detection sensor 7 is provided on the stator 6 side, which is a portion facing the magnet 2 and the stator 6. Specifically, the magnetic detection sensor 7 is provided on the inner surface side of the yoke 4 facing the outer surface 2 a of the magnet 2, that is, between the claw magnetic poles 9 formed on the yoke 4. The magnetic detection sensor 7 is disposed in the lower end of the yoke at a position that does not protrude from the inner surface of the yoke 4.

  In the inner rotor type claw pole type motor configured as described above, a magnetic field generated by energization of the winding 5 is transmitted from the claw magnetic pole 9 to the magnet 2, whereby the magnet 2 and the N pole or S The rotor 3 rotates about the rotating shaft 1 by attracting and repelling with the claw magnetic pole 9 that is switched to the pole at high speed. The magnetic pole of the rotating rotor 3 is detected by a magnetic detection sensor 7 provided inside the yoke 4. The magnetic field generated by the winding 5 in response to the output signal from the magnetic detection sensor 7 is driven and controlled by a driving substrate (driving circuit unit) (not shown). The advance angle can be adjusted by controlling the energization timing of the winding 5 in the drive circuit unit.

  According to the claw pole type motor of the first embodiment, the magnetic detection sensor 7 is located not in the lower position facing the lower surface of the magnet 2 in the axial direction of the rotor 3 but in the portion facing the magnet 2 and the stator 6 on the stator side. Since the magnetism detecting sensor 7 can be disposed without reducing the size of the magnet 2, the motor itself can be reduced in size. In this embodiment, as shown in FIG. 1, the height of the magnet 2 can be sufficiently secured to such an extent that the motor output can be sufficiently secured. If the magnetic detection sensor 7 is disposed below the lower surface of the magnet 2, the motor itself becomes larger, and when attempting to reduce the size of the motor, on the contrary, the height of the magnet 2 becomes shorter and a sufficient magnetic circuit cannot be constructed. In the first embodiment, this problem can be solved.

  In the first embodiment, a claw pole type motor has been described as an example. However, even a normal stepping motor that does not have the claw magnetic pole 9 can provide the same operational effects. The same applies to the motors of the second to seventh embodiments.

“Second Embodiment”
FIG. 3 is a schematic cross-sectional view of a claw pole type motor in the second embodiment. The claw pole type motor of the second embodiment is an inner rotor type motor of the first embodiment, but is an example in which the drive substrate 11 is disposed below the magnet 2 and the stator 6.

  In the claw pole type motor of the second embodiment, the size of the magnet 2 is reduced by providing a magnetic detection sensor 7 in the stator 6 that is outside the rotor 3 and faces the rotor 3 as in the first embodiment. The drive substrate 11 can be disposed below the stator 6 and the magnet 2 after ensuring sufficiently.

  Thus, even when the drive substrate 11 is disposed below the stator 6 and the magnet 2, the motor itself can be reduced in size as compared with the case where the magnetic detection sensor 7 is disposed below the lower surface of the magnet 2.

“Third Embodiment”
FIG. 4 is a schematic sectional view of a claw pole type motor in the third embodiment. The claw pole type motor according to the third embodiment is the inner rotor type motor according to the first embodiment. However, the magnetic detection sensor 7 is disposed on the rotor 3 side at a portion facing the magnet 2 and the stator 6. This is an example.

  The magnetic detection sensor 7 is a portion where the magnet 2 and the stator 6 are opposed to each other, and is provided below the inner surface 2 b of the magnet 2 constituting the rotor 3. The magnetic detection sensor 7 is attached to a drive substrate 11 disposed below the magnet 2 and the stator 6. When the magnetic detection sensor 2 is disposed inside the cylindrical magnet 2 as in this embodiment, when the magnetic flux does not flow inside due to the polar anisotropy of the magnet 2, the magnet is dedicated to the sensor. 2 on the inner surface 2b. In this example, the advance angle can be adjusted by adjusting the attachment position of the magnetic detection sensor 7 on the drive substrate 11.

  According to the claw pole type motor of the third embodiment, the magnetic detection sensor 7 is not on the lower position facing the lower surface of the magnet 2 in the axial direction of the rotor 3 but on the rotor side at the portion facing the magnet 2 and the stator 6. Therefore, the magnetism detection sensor 7 can be arranged without reducing the size of the magnet 2, and the motor itself can be downsized.

“Fourth Embodiment”
FIG. 5 is a schematic cross-sectional view of a claw pole type motor in the fourth embodiment. The inner rotor type claw pole type motor of the fourth embodiment has basically the same configuration as that of the motor of the first embodiment, except that the magnet 2 is directly fixed to the rotary shaft 1 and the yoke 4 is connected to the dust. This is an example of any one of an iron core, resin binding, metallic glass, and silicon steel plate. Other configurations are the same as those of the first embodiment shown in FIGS.

  In order to configure the yoke 4 with a dust core, the yoke 4 formed by filling and compressing magnetic powder in the cavity of the mold is used. The compacted iron core has a structure in which the surface of each iron powder is coated with an inorganic insulating film and the particles are bound with resin. The iron loss at high frequency is low (eddy current loss is low), and the saturation magnetic flux It has the advantage of high density and excellent heat resistance.

  In the claw pole type motor in which the yoke 4 is composed of a dust core, it can be used in a high frequency range of several hundred kHz that cannot be satisfied by the electromagnetic steel sheet and ferrite that have been used in the yoke so far. It can be made thinner and smaller in performance.

  In addition, the claw pole type motor in which the yoke 54 is made of resin-bound, metal glass, and silicon steel plate can reduce the eddy current loss as well as the dust core and can be a highly efficient motor, and the winding structure is also simplified. Therefore, the manufacturing cost can be reduced.

  It should be noted that the construction of the yoke 4 with any one of a powder iron core, a resin binding, a metal glass, and a silicon steel plate also applies to the yokes of the claw pole type motors of the second and third embodiments, and the same applies to these embodiments. The effect of this can be obtained.

“Fifth Embodiment”
FIG. 6 is a schematic sectional view of a claw pole type motor in the fifth embodiment. The fifth embodiment is an example in which the drive substrate 11 is disposed in the yoke 4 in addition to the configuration of the claw pole type motor of the fourth embodiment.

  In this embodiment, the drive substrate 11 that receives the output signal from the magnetic detection sensor 7 and controls the magnetic field generated in the winding 5 is in the winding accommodating space formed in the yoke 4 and below the bobbin 10. It is arranged. Therefore, the driving substrate 11 has a ring shape in plan view.

  According to the claw pole type motor of the fifth embodiment, since the drive substrate 11 is disposed in the yoke 4, the motor itself is further miniaturized (particularly thinned) as the drive substrate 11 does not come out. be able to. Further, according to the claw pole type motor, since the driving substrate 11 is arranged under the winding 5, wiring between them becomes easy, and the assembling property and the manufacturing cost can be reduced.

“Sixth Embodiment”
FIG. 7 is a schematic sectional view of a claw pole type motor in the sixth embodiment. The sixth embodiment is an example of a so-called outer rotor type claw pole type motor in which the stator 6 is disposed opposite to the inner side of the rotor 3.

  In the outer rotor type claw pole type motor, a magnet mounting plate 12 having a disk shape in a plan view is fixed to the rotating shaft 1 and a cylinder that is large enough to accommodate the stator 6 inside the outer periphery of the magnet mounting plate 12. The magnet 2 having a shape is fixed. The magnetic detection sensor 7 is a portion facing the magnet 2 and the stator 6 and is provided on the stator 6 side.

  According to the claw pole type motor of the sixth embodiment, even if it is an outer rotor type, it is not a lower position facing the lower surface of the magnet 2 in the axial direction of the rotor 3, Since the magnetism detection sensor 7 is provided on the stator side, which is a portion where the magnet 2 and the stator 6 are opposed to each other, the magnetism detection sensor 7 can be disposed without reducing the size of the magnet 2, and the motor itself is small. (Especially thinning).

“Seventh Embodiment”
FIG. 8 is a schematic sectional view of a pump according to the seventh embodiment. In this embodiment, the motor (claw pole type motor) according to the present invention is housed in a pump case having a suction port and a discharge port for sucking and discharging liquid, and the rotor is provided with an impeller. .

  The pump of the seventh embodiment includes an impeller 21 for sucking and discharging liquid, a pump case 24 having a suction port 22 and a discharge port 23 for sucking and discharging liquid, and a pump chamber 25 for rotatably housing the impeller 21. A separation plate 26 formed in a pair with the pump case 24, a rotor 28 having a magnet 27 for rotationally driving the impeller 21, a stator 30 having claw magnetic poles for transmitting rotational driving force to the rotor 28, a stator A claw pole motor provided with a control board 31 for controlling the magnetic field generated at 30 is used as a drive source.

  The pump according to the seventh embodiment has a pump structure using a so-called inner-type rotor type claw pole motor in which a rotor 28 is disposed on the inner side and a stator 30 is disposed on the outer side with a separation plate 26 interposed therebetween. It has become.

  The pump chamber 25 separates the rotor 28 and the stator 30 into a watertight state in a pump case 24 having a suction port 22 opened in the center of the top surface and a discharge port 23 provided on the side wall (the pump unit and the motor unit are separated). It is formed by joining separation plates 26 to be separated. In addition, a seal member 29 is interposed at a joint portion between the pump case 24 and the separation plate 26 in order to partition the pump portion and the motor portion in a watertight state.

  The rotor 28 is formed as a cylindrical body provided integrally with the impeller 21, and a magnet 27 constituting a magnetic circuit (magnetic flux) is provided on the outer wall of the cylindrical portion. The rotor 28 is connected via a bearing portion 35 to a shaft shaft 32 provided on the pump case 24 and a fixed shaft 34 whose ends are inserted and fitted to a shaft support portion 33 provided on the separation plate 26. And is rotatably supported. The fixed shaft 34 is made non-rotatable by rotation stop plates 36 and 37 attached to both ends thereof. A gap (clearance) is secured between the magnet 27 and the separation plate 26 so as not to contact when the rotor 28 rotates.

  Since the impeller 21 is integrated with the rotor 28, the impeller 21 rotates around the fixed shaft 34, applies centrifugal force to the liquid sucked into the pump chamber 25 from the suction port 22, and flows out of the pump from the discharge port 23. And discharge.

  The stator 30 is disposed opposite to the outside of the rotor 28 with the separation plate 26 interposed therebetween. The stator 30 is configured such that a winding 38 wound around a bobbin (not shown) is disposed on a yoke 42 having a plurality of claw magnetic poles 41. In the claw pole type stator 30, the magnetic field generated by energizing the coil 38 can be efficiently transmitted from the claw magnetic pole 41 to the rotor 28.

  The drive substrate 31 is provided on the back surface of the separation plate 26 and controls a magnetic field generated in the winding 38 in response to a signal from the position detection unit 39 that is a position detection sensor. The magnetic detection sensor 43 is disposed in the yoke 42 of the stator 30 facing the magnet 27 with the separation plate 26 interposed therebetween, and detects a magnetic pole magnetized on the magnet 27. The separation plate 26 including the stator 30 and the drive substrate 31 is entirely covered with a mold resin 40 made of, for example, unsaturated polyester.

  In the pump configured as described above, the magnetic field generated by energizing the coil 38 is transmitted from the claw magnetic pole 41 to the magnet 27, whereby the magnet 27 is attracted and repelled, so that it is integrated with the rotor 28. The provided impeller 21 rotates around the fixed shaft 34. Then, a pump action is generated with the rotation of the impeller 21, and the liquid is sucked into the pump chamber 25 from the suction port 22, and the liquid pressurized in the pump chamber 25 and pumped in the peripheral direction is discharged from the discharge port. 23 is discharged out of the pump.

  In the pump of the seventh embodiment, the entire claw pole type motor having an inner type rotor structure is covered with the mold resin 40, so that the heat of the motor and the heat of the liquid are transferred to the outside of the motor through the mold resin 40. It can be escaped and the motor can be cooled. Therefore, according to the pump of the present embodiment, the motor efficiency can be improved and the motor can be downsized.

  Moreover, according to the pump of this embodiment, the pump itself can be reduced in size by using the motor of the present invention that can be reduced in size without reducing the size of the magnet 27.

FIG. 1 is a schematic sectional view of a claw pole type motor in the first embodiment. 2 shows the stator of the claw pole type motor of FIG. 1, (A) is a plan view of the stator, (B) is a cross-sectional view taken along line AA of FIG. 1 (A), and (C) is FIG. 1 (A). It is a BB sectional view taken on the line. FIG. 3 is a schematic cross-sectional view of a claw pole type motor in the second embodiment. FIG. 4 is a schematic sectional view of a claw pole type motor in the third embodiment. FIG. 5 is a schematic cross-sectional view of a claw pole type motor in the fourth embodiment. FIG. 6 is a schematic sectional view of a claw pole type motor in the fifth embodiment. FIG. 7 is a schematic sectional view of a claw pole type motor in the sixth embodiment. FIG. 8 is a schematic sectional view of a pump according to the seventh embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,34 ... Rotary shaft 2,27 ... Magnet 3,28 ... Rotor 4,42 ... Yoke 5,38 ... Winding 6,30 ... Stator 7 ... Magnetic detection sensor 9 ... Claw magnetic pole 10 ... Bobbin 11, 31 ... Drive board

Claims (7)

A rotor having a magnet fixed to a rotating shaft;
A stator that is disposed oppositely or on the outside of the rotor and that has a winding attached to a yoke that transmits a rotational driving force to the rotor;
A magnetic detection sensor for detecting a magnetic pole magnetized in the magnet,
The motor according to claim 1, wherein the magnetism detection sensor is provided on either the rotor side or the stator side at a portion where the magnet and the stator are opposed to each other. The motor according to claim 1,
The motor, wherein the stator is disposed opposite to the outside of the rotor, and the magnetic detection sensor is provided inside the stator that is outside the rotor and faces the rotor. The motor according to claim 1,
The motor is characterized in that the stator is disposed opposite to the outer side of the rotor, and the magnetic detection sensor is provided on the inner side of the rotor facing the stator. The motor according to any one of claims 1 to 3,
A motor characterized in that the yoke is made of any one of a powdered iron core, a resin binding, metal glass, and a silicon steel plate. The motor according to any one of claims 1 to 4,
A motor, wherein a drive substrate that receives an output signal from the magnetic detection sensor and controls a magnetic field generated in the winding is disposed in the yoke. The motor according to any one of claims 1 to 5,
A claw pole type motor is provided by providing a claw magnetic pole on the yoke. A pump characterized in that the motor according to any one of claims 1 to 6 is accommodated in a pump case having a suction port and a discharge port for sucking and discharging liquid, and an impeller is provided in the rotor. .

Images