JP7637983B2 - Resolver structure and method for suppressing motor noise from entering winding portion of resolver structure - Google Patents

Description

The present invention relates to a resolver structure and a method for suppressing ingress of motor noise into the windings of the resolver structure, and in particular to a new improvement for providing a mounting magnetic ring with protrusions via a non-magnetic ring on the outer periphery of an annular stator in order to suppress ingress of motor noise from the motor into the detection windings of the resolver windings.

Examples of patent publications showing configurations for suppressing intrusion of external noise from this type of motor or the like into a resolver that have been used in the past include the configuration of Patent Document 1 shown in FIGS. 3 and 4 and the configuration of Patent Document 2 shown in FIG. 5.
3 and 4 is the configuration disclosed in Patent Document 1, in which one end of each of the bobbins 2 lined up in the circumferential direction of the bobbin support frame 12 of the stator body 1 is covered with an end shield 41 made of metal, and the row of bobbins 2 lined up in the circumferential direction of the bobbin support frame 12 is surrounded by a side shield 42 made of metal. This blocks the stator windings 23 of each bobbin 2 from magnetic field noise and electric field noise.
The mounting pin 3 formed on the bobbin 2 is inserted into the pin hole 41a of the end shield 41, and the mounting pin 3 is thermally deformed so that the shape of the tip portion of the mounting pin 3 becomes larger than the inner diameter of the pin hole 41a, thereby fixing the shield body 4 to the stator body 1.

In addition, in the configuration of FIG. 5 showing another conventional configuration, in a resolver stator structure including a stator winding 23 wound around a plurality of protruding magnetic poles 5 of an annular stator 1 and a winding sealing resin 52 provided on both end faces 50, 51 of the annular stator 1 for covering the stator winding 23, a shielding metal plate 53 or shielding metal plating provided on the surface of the winding sealing resin 52 prevents external magnetic noise.
A motor case 54 is connected to the above-mentioned shielding metal plate 53 .

JP 2013-165608 A JP 2016-127614 A

Conventional resolvers configured as described above have the following problems:
That is, in the case of the first conventional configuration shown in Figures 3 and 4, a ring-shaped shield body 4 was provided for the stator body 1, and this shield body 4 was attached to the stator body 1 via a mounting pin 3 provided on a bobbin 2, and the head of the mounting pin 3 protruding from the shield body 4 had to be thermally crimped.
Therefore, in order to shield the stator winding 23, many parts and assembly steps are required, resulting in increased costs.

In the case of the second conventional configuration shown in FIG. 5 , the surface of the stator winding 23 provided on the outer periphery of the protruding magnetic poles 5 of the annular stator 1 is covered with a winding sealing resin 52, and a shielding metal plate 53 is provided on the outer surface side.
Therefore, a resin for sealing the windings must be injected between the stator windings 23 and the shielding metal plate 53, which is a major obstacle in the manufacturing process.

The present invention has been made to solve the above problems, and in particular to provide a resolver structure in which a mounting magnetic ring having a protrusion is provided on the outer periphery of an annular stator via a non-magnetic ring in order to prevent motor noise from the motor from entering the detection winding of the winding part of the resolver, and a method for preventing motor noise from entering the winding part of the resolver structure.

The resolver structure according to the present invention comprises a resolver provided on a motor having a motor stator winding, a non-magnetic ring provided on the outer periphery of a ring-shaped stator of the resolver, a mounting magnetic ring provided on the outer periphery of the non-magnetic ring, and a number of magnetic protrusions formed partially on the mounting magnetic ring, wherein the tips of the magnetic protrusions protrude toward the motor side, and the magnetic protrusions suppress motor noise from the motor from entering the detection winding of the resolver, and the magnetic protrusions and the mounting magnetic ring are configured to be integrated to form an L-shaped cross section. In addition, the method of suppressing motor noise from entering the winding portion of a resolver structure according to the present invention uses a resolver provided on a motor having a motor stator winding, a non-magnetic ring provided on the outer periphery of a ring-shaped stator of the resolver, a mounting magnetic ring provided on the outer periphery of the non-magnetic ring, and a large number of magnetic protrusions formed partially on the mounting magnetic ring, in which the tips of the magnetic protrusions protrude toward the motor side and the magnetic protrusions suppress motor noise from the motor from entering the detection winding of the resolver, and the magnetic protrusions and the mounting magnetic ring are integrated to form an L-shaped cross section.

Since the resolver structure and the method for suppressing intrusion of motor noise into the windings of the resolver structure according to the present invention are configured as described above, the following effects can be obtained.
That is, the configuration and method includes a resolver provided on a motor having a motor stator winding , a non-magnetic ring provided on the outer periphery of the resolver 's annular stator , a mounting magnetic ring provided on the outer periphery of the non- magnetic ring , and a number of magnetic protrusions formed partially on the mounting magnetic ring, with the tips of the magnetic protrusions configured to protrude toward the motor side, and the magnetic protrusions used to prevent motor noise from the motor from entering the detection winding of the resolver.By doing so, the motor noise, which could be a cause of resolver error, is concentrated on the magnetic protrusions of the mounting magnetic ring, suppressing the effect of the motor noise on the detection winding, and maintaining the accuracy of the resolver output signal.
In addition , since the magnetic protrusion and the mounting magnetic ring are integrated to form an L-shaped cross section, each magnetic protrusion and its tip act as an antenna, smoothly collecting motor noise that reaches the circumference of the ring-shaped stator and grounding it.

FIG. 2 is a diagram showing an arrangement of a motor and a resolver to illustrate a resolver structure according to an embodiment of the present invention. FIG. 2 is a left side view of the resolver of FIG. 1 . FIG. 1 is an exploded perspective view showing a resolver stator having a first conventional configuration. FIG. 4 is a perspective view showing a state after the resolver stator of FIG. 3 is assembled. FIG. 11 is a cross-sectional view showing a second conventional configuration.

The resolver structure and method of suppressing motor noise from entering the windings of the resolver structure according to the present invention is to provide a mounting magnetic ring with protrusions on the outer periphery of the ring-shaped stator via a non-magnetic ring in order to suppress motor noise from the motor from entering the detection windings of the resolver windings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a resolver structure and a method for suppressing motor noise from entering a winding portion of a resolver structure according to the present invention will be described with reference to the drawings.
In addition, the same reference numerals will be used to denote the same or equivalent parts as those in the conventional example.
In FIG. 1, reference numeral 100 denotes a motor such as a servo motor. Motor 100 has a motor stator 101 having a periphery 102A provided with motor stator windings 23 for driving a motor rotor (not shown) to rotate.

A resolver 104 having at least a ring-shaped stator 103 with a well-known rotor (not shown) disposed therein is provided for the motor 100, and the motor 100 and the resolver 104 constitute a resolver-equipped motor 102.
As for the mounting configuration of the resolver 104 and the motor 100, the resolver 104 is provided in any one of the following mounting configurations with respect to the motor 100 having the motor stator windings 23, although not shown in the figure: a direct mounting configuration (commonly performed and well known), a configuration in which it is mounted adjacent to the motor 100, or a configuration in which it is mounted at a distance.
However, the most commonly used resolver motor is configured such that the resolver 104 is directly attached to the motor shaft 100A of the motor 100, thereby forming an integral unit therewith.

Next, the detailed configuration of the resolver 104 will be described.
A non-magnetic ring 105 made of a non-magnetic material such as resin or metal is provided on an outer periphery 103A of the ring-shaped stator 103 of the resolver 104.
A mounting magnetic ring 106 having a number of partially independent magnetic protrusions 107 along its circumference is provided on the outer periphery 105A of the non-magnetic ring 105, and the mounting magnetic ring 106 is used when mounting the resolver 104 to the motor 100.
1, that is, on the motor 100 side, the magnetic protrusion 107 formed integrally with the mounting magnetic ring 106 is provided to protrude along the axial direction P. That is, the magnetic protrusion 107 is not formed continuously in a circular shape along the circumference of the mounting magnetic ring 106, but is formed in large numbers at predetermined angular intervals as shown in the figure, and only when the magnetic protrusion 107 and the mounting magnetic ring 106 are viewed as a single unit in cross section along the A'-A' cross section in Fig. 2, as shown in Fig. 1, does the cross section have an L-shape.

In other words, since the magnetic protrusion portion 107 is integral with the mounting magnetic ring 106, as described above, when viewed in cross section as a single unit, the magnetic protrusion portion 107 and the mounting magnetic ring 106 are formed in an L-shape, and the magnetic protrusion portion 107 is integrally formed as a part of the mounting magnetic ring 106.
FIG. 2 is a left side view of the resolver 104 in FIG. 1, and it is clear that the magnetic protrusions 107 are provided at predetermined angular intervals on the mounting magnetic ring 106, and in the case of FIG. 2, a total of seven (a large number) are configured.

The winding section 110 of the resolver 104 is composed of a number of protruding magnetic poles 111 that are integrally formed and protrude at predetermined angular intervals inside the annular stator 103, and a stator winding 114 that is wound around each of the protruding magnetic poles 111 and consists of an excitation winding 112 and a detection winding 113.
Further, the mounting magnetic ring 106 is provided on its periphery with a long hole 115 and a notch 116 which are necessary when mounting the resolver 104 to the motor 100 .

In the above-mentioned configuration, when the motor 100 is driven, if the motor noise 120, which is mainly composed of leakage magnetic flux generated from the motor stator winding 23, leaks to the resolver 104 side, the tip 107A of each magnetic protrusion 107 protrudes toward the motor 100 side beyond the thickness T of the annular stator 103 and is close to the motor 100, so that the magnetic protrusion 107 acts as an antenna, and the motor noise 120 flows through the magnetic protrusion 107 to the earth side (not shown). In addition, the noise can be prevented from entering the detection winding 113 of the resolver 104, improving the accuracy of the resolver output.

According to the resolver structure and the method for suppressing the ingress of motor noise into the windings of the resolver structure of the present invention, the mounting magnetic ring with an L-shaped cross section provided on the outer periphery of the resolver's ring-shaped stator has a large number of magnetic protrusions formed thereon, which suppresses leakage magnetic flux from the motor from entering the detection windings of the resolver, thereby improving the accuracy of the resolver output.

23 Motor stator winding 100 Motor 100A Motor shaft 101 Motor stator 102 Motor with resolver 102A Periphery 103 Ring-shaped stator 103A Outer circumference 104 Resolver 105 Non-magnetic ring 105A Outer circumference 106 Mounting magnetic ring 107 Magnetic protrusion 107A Tip 110 Winding portion 111 Protruding magnetic pole 112 Excitation winding 113 Detection winding 114 Stator winding 115 Slot 116 Notch 120 Motor noise P Axial direction T Thickness

Claims (4)

a resolver (104) provided in a motor (100) having a motor stator winding (23); a non-magnetic ring (105) provided on an outer periphery (103A) of an annular stator (103) of the resolver (104); a mounting magnetic ring (106) provided on an outer periphery (105A) of the non-magnetic ring (105); and a large number of magnetic protrusions (107) partially formed on the mounting magnetic ring (106);
The tip (107A) of the magnetic protrusion (107) is configured to protrude toward the motor (100),
A resolver structure characterized in that the magnetic protrusion portion (107) is configured to suppress motor noise (120) from the motor (100) from entering a detection winding (113) of the resolver (104). The resolver structure according to claim 1, characterized in that the magnetic protrusion (107) and the mounting magnetic ring (106) are integrally formed to have an L-shaped cross section. A resolver (104) provided in a motor (100) having a motor stator winding (23), a non-magnetic ring (105) provided on an outer periphery (103A) of a ring-shaped stator (103) of the resolver (104), a mounting magnetic ring (106) provided on an outer periphery (105A) of the non-magnetic ring (105), and a large number of magnetic protrusions (107) partially formed on the mounting magnetic ring (106),
The tip (107A) of the magnetic protrusion (107) is caused to protrude toward the motor (100),
A method for suppressing motor noise from entering a winding portion of a resolver structure, characterized in that the magnetic protrusion portion (107) suppresses motor noise (120) from the motor (100) from entering a detection winding (113) of the resolver (104). The method for suppressing motor noise from entering the windings of a resolver structure according to claim 3, characterized in that the magnetic protrusion (107) and the mounting magnetic ring (106) are integrally formed with an L-shaped cross section.