JP3684143B2 - Permanent magnet synchronous motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a permanent magnet synchronous motor.
[0002]
[Prior art]
An electric motor is known as an electric device that converts electric energy into mechanical energy, and a permanent magnet type synchronous motor has been developed as one of the electric motors. The permanent magnet synchronous motor has a magnetic pole position detection device that uses a magnetic pole position detection element such as a Hall element that detects magnetic flux, detects the rotor position (rotation angle), and controls to three phases according to this. By supplying the respective phase currents, a predetermined torque characteristic can be obtained. The Hall element is required to be mounted at an accurate position, and high mounting accuracy is required particularly when the number of poles of the motor is increased. For example, when it is 1 degree with respect to 90 degrees in 4 poles, it becomes 0.5 degree with respect to 45 degrees in 8 poles, and it was necessary to mount more accurately.
[0003]
In the conventional magnetic pole position detection device, it has been proposed to attach a substrate on which a Hall element is mounted to a bracket of a motor, and to use a holder as a member for holding the Hall element (Japanese Patent Laid-Open No. 2-87959, JP-A-6-113520). However, in order to attach the substrate with the holder to the bracket, it is necessary to change the shape of the bracket, and it also affects the position error between the rotor position detection magnet (magnetic pole) and the Hall element to be detected. There are a number of factors such as the accuracy of the substrate, bracket, etc., and the assembly accuracy of the substrate, bracket, housing, stator, etc. Therefore, it has been difficult to accurately assemble the position detecting magnet and the Hall element.
[0004]
In addition, it has been proposed that a protrusion is provided on the coil bobbin of the stator and a substrate is attached to the protrusion (Japanese Patent Laid-Open No. 5-252716). However, the protrusion is easily deformed and is attached at an accurate position. That was difficult. Furthermore, it has been proposed to mount a holder having all the hall elements attached to the stator core (see Japanese Patent Laid-Open No. 10-191612), but using a single substrate and holder with a plurality of types of rotating diameter motors. The parts could not be shared.
[0005]
[Problems to be solved by the invention]
The present invention is intended to solve the problems of the prior art, allows to reduce the influence of deterioration due to deformation and aging to facilitate assembling accurately mounting the magnetic pole position detection elements, or by heat and to it, or by sharing a plurality of kinds of substrates and the holder be a motor of the rotation diameter, and an object thereof is to provide a permanent magnet type synchronous motor which can suppress the increase in the number of parts.
[0006]
[Means for Solving the Problems]
The present invention provides a permanent magnetic pole position detection device having a motor body having a rotor and a stator, a substrate on which a magnetic pole position detection element is mounted, and a holder that holds the magnetic pole position detection element and is fixed to the substrate. In the magnet type synchronous motor, the substrate and the holder have a plurality of types of mounting holes in the motor rotation diameter direction, and are attached to the coil bobbin of the stator through a part of the mounting holes , and the coil bobbin is located outside the coil bobbin in the motor rotation diameter direction. a permanent magnet synchronous motors that have a mounting hole of the magnetic pole position detecting device.
[0007]
The present invention also includes a magnetic pole position detection device having a motor main body having a rotor and a stator, a substrate on which the magnetic pole position detection element is mounted, and a holder that holds the magnetic pole position detection element and is fixed to the substrate. In the permanent magnet type synchronous motor, the substrate and the holder have a plurality of types of mounting holes in the motor rotational diameter direction, and are attached to the coil bobbin of the stator through a part of the mounting holes. a permanent magnet synchronous motors that have a mounting hole of the magnetic pole position detecting device inside.
[0009]
Further, according to the present invention, the stator coil bobbin is a permanent magnet type synchronous motor having a plate under a mounting hole.
[0010]
In the present invention, the coil bobbin of the stator is a permanent magnet type synchronous motor having a plate mounting groove.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention will be described.
An embodiment of the permanent magnet type synchronous motor of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory cross-sectional view of a permanent magnet type synchronous motor according to a first embodiment. FIG. 2 is an explanatory diagram of attachment of the substrate and the holder in the first embodiment. FIG. 3 is an explanatory diagram of a substrate and a holder in the first embodiment. FIG. 4 is an explanatory perspective view of the holder in the first embodiment. FIG. 5 is an explanatory diagram of an element mounting portion of the holder in the first embodiment. FIG. 6 is a cross-sectional explanatory diagram of a permanent magnet type synchronous motor according to a modification of the first embodiment. FIG. 7 is an explanatory diagram of attachment of a substrate and a holder in the second embodiment.
[0012]
Example 1 will be described. As shown in FIGS. 1 and 2, the permanent magnet type synchronous motor 1 of the present embodiment includes a motor main body 2, a magnetic pole position detection device 3, a housing 81, a bracket 82, a rotary bearing 83, and the like. The motor main body 2 includes a position detection magnet 22, a rotor 21 having a rotation shaft 23, a stator coil 25 having a coil bobbin 26, a stator 24 having a stator core 27, and the like, and generates rotational torque. . The magnetic pole position detection device 3 includes a substrate 4, a Hall element 5, a holder 6, a lead wire 7, and the like, measures the magnetic flux from the position detection magnet 22, and detects the position (rotation angle) of the rotor 21. In FIG. 2, the rotor and the like are not shown.
[0013]
The board | substrate and holder in Example 1 are demonstrated in detail using FIGS. The substrate 4 has mounting holes 41a and 41b such as screw holes for the coil bobbin 26, and the Hall element 5, the holder 6, the lead wire 7 and the like are attached thereto. The mounting holes 41a and 41b will be described later. The holder 6 has mounting holes 61 a and 61 b such as a plurality of types of screw holes, an element holding portion 62, a positioning projection 65, and a protruding portion 66. The mounting holes 61a and 61b will be described later. The element holding portion 62 is provided in the vicinity of the inner periphery of the motor rotational radial direction, has an elastic element support piece 63, and has a wide wall 64 on the inner side of the motor rotational radial direction. . The element support piece 63 holds the inserted Hall element 5 by a spring action. The wall 64 secures a creepage distance from the position detection magnet 22. As shown in FIG. 5, the portion other than the wall portion 64 of the element holding portion 62 has a narrow width, and when the Hall element 5 is inserted, it can be reliably inserted into the element support piece 63. it can. When the holder 6 is attached to the substrate 4, the protruding portion 66 protrudes outward in the radial direction of the substrate 4, and plays a role of alignment by being applied to the housing 81 or a jig when attached to the coil bobbin 26. Details will be described later. Further, the holder 6 has a groove portion 67 in the vicinity of the outer periphery in the rotational radial direction of the surface in contact with the substrate 4. Moisture that enters the gap between the contact surfaces of the substrate 4 and the holder 6 due to capillary action from the housing side (outside in the radial direction of the rotation) stops at the groove 67, so that the influence on the inner circuit components can be suppressed.
[0014]
The board and holder mounting holes will be described. Two types of mounting holes 41 and 61 are provided on the outer side and the inner side, and even if the coil bobbin 26 has a different diameter, the parts can be shared and used. For example, when the diameter of the coil bobbin 26 is short (small diameter), as shown in FIG. 2, the mounting holes 41a and 61a on the outside of the substrate and the holder, and the mounting hole 27a on the outward position of the coil bobbin (motor rotation radial direction outside) use the while, the diameter of the coil bobbin 26 is long (large) time, as shown in FIG. 7, the substrate and the holder inside the mounting holes 41b, 61b and the position inward of the coil bobbin (motor rotation radial direction inner side) The mounting holes 27b are used. Thus, one type of substrate and holder can be used for a plurality of types of coil bobbins, and components can be shared.
[0015]
The attachment of the substrate and the holder to the coil bobbin in Example 1 will be described. The relative position between the projection 65 of the holder and the Hall element 5 is accurately held by the holder 6. The groove and coil phase of the coil bobbin 26 are accurately held by the coil bobbin 26. First, the substrate 4 and the holder 6 to which the Hall element 5 is attached are placed on the coil bobbin 26, and the protrusion 66 of the holder 6 is brought into contact with the inner surface of the housing 81 to determine the position in the rotational radial direction. Next, when the motor is shifted in the rotation direction, the protrusion 65 of the holder and a groove (not shown) of the coil bobbin 26 collide with each other, so that the position in the rotation direction can be correct. Thereby, the board | substrate 4 and the holder 6 can be moved to an exact position with respect to the coil bobbin 26, and can be attached. Next, the mounting hole 41 of the substrate and the mounting hole 61 of the holder 6 and the mounting hole 27 of the coil bobbin are mounted by fixing means such as screws. For example, a metal plate 29 is provided below the coil bobbin 26. When the plate 29 is fixed together, the coil bobbin mounting hole 27 can be securely fixed even if it is thermally deformed or deteriorated due to aging. . If the plate mounting groove 28 is provided in the coil bobbin 26 and the plate 29 is mounted in advance, the work of fixing the substrate 4 and the holder 6 to the coil bobbin 26 can be facilitated.
[0016]
In place of the position detection magnet 22, as shown in the modification of FIG. 6, the rotor 21 is extended to the inner peripheral side of the magnetic pole position detection device 3 to detect the magnetic flux of the rotor 21. The same effect can be obtained also in the motor.
[0017]
A second embodiment will be described. In the permanent magnet type synchronous motor 1 of the present embodiment, as shown in FIG. 7, the coil bobbin 26 has a large diameter and is provided with a mounting hole 27b inward in the rotational radial direction. Further, the mounting holes 41b and 61b used by the substrate and the holder are inside. Except this, it is the same as the first embodiment. Then, with respect to the mounting of the substrate 4 and the holder 6 to the coil bobbin 26, in the first embodiment, the alignment of the rotating radial direction was performed by contacting the protruding portion of the holder with the housing. A jig (not shown) is inserted into the holder, and the protrusion 66 of the holder is brought into contact with the jig, thereby performing alignment in the rotational radial direction. As a result, as in the first embodiment, alignment in the motor rotation direction can be performed accurately.
[0018]
The mounting holes 41 and 61 for the substrate and the holder can be of three or more types, and the mounting holes 27 for the coil bobbins can be other than outward or inward positions (motor rotation radial direction outer side or inner side). it is also possible to be. The same effect can be obtained also in a permanent magnet type synchronous motor that detects the magnetic flux of the rotor 21 by extending the rotor 21 to the inner periphery of the magnetic pole position detection device 3 instead of the position detection magnet 22. it can.
[0019]
【The invention's effect】
According to the present invention, to facilitate assembling accurately mounting the magnetic pole position detecting elements, or that makes it possible to reduce the influence of the deterioration due to deformation and aging by heat, or a plurality of types a motor rotational diameter share the substrate and the holder may also it to provide a permanent magnet type synchronous motor which can suppress the increase in the number of parts.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view of a permanent magnet type synchronous motor according to a first embodiment.
FIG. 2 is an explanatory diagram of attachment of a substrate and a holder in the first embodiment.
3 is an explanatory diagram of a substrate and a holder in Example 1. FIG.
4 is a perspective explanatory view of a holder in Embodiment 1. FIG.
5 is an explanatory diagram of an element mounting portion of a holder in Embodiment 1. FIG.
FIG. 6 is a cross-sectional explanatory view of a permanent magnet type synchronous motor according to a modification of the first embodiment.
7 is an explanatory diagram of attachment of a substrate and a holder in Example 2. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Permanent magnet type synchronous motor 2 Motor main part 21 Rotor 22 Position detection magnet 23 Rotating shaft 24 Stator 25 Stator coil 26 Coil bobbins 27a, 27b Mounting hole 28 Plate mounting groove 29 Plate 3 Magnetic pole position detection device 4 Substrate 41a, 41b Mounting hole 5 Hall element 6 Holder 61a, 61b Mounting hole 62 Element holding part 63 Element holding piece 64 Wall part 65 Positioning projection 66 Projection part 67 Groove part 7 Lead wire 81 Housing 82 Bracket 83 Bearing

Claims (4)

Permanent magnet type synchronous motor having a magnetic pole position detecting device having a motor main body having a rotor and a stator, a substrate on which the magnetic pole position detecting element is mounted, and a holder that holds the magnetic pole position detecting element and is fixed to the substrate. In
The substrate and the holder have a plurality of types of attachment holes in the motor rotation diameter direction, and are attached to the coil bobbin of the stator through a part of the attachment holes. a permanent magnet type synchronous motor, characterized in Rukoto that have a hole. Permanent magnet type synchronous motor having a magnetic pole position detecting device having a motor main body having a rotor and a stator, a substrate on which the magnetic pole position detecting element is mounted, and a holder that holds the magnetic pole position detecting element and is fixed to the substrate. In
The substrate and the holder have a plurality of types of mounting holes in the motor rotational diameter direction, and are attached to the stator coil bobbins through a part of the mounting holes. a permanent magnet type synchronous motor, characterized in Rukoto that have a hole. In the permanent magnet type synchronous motor according to claim 1 or 2 ,
A permanent magnet type synchronous motor , wherein the coil bobbin of the stator has a plate under the mounting hole. In the permanent magnet type synchronous motor according to claim 3,
A permanent magnet type synchronous motor, wherein the coil bobbin of the stator has a plate mounting groove .

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