CN112514213A - Motor unit - Google Patents

Motor unit Download PDF

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Publication number
CN112514213A
CN112514213A CN201880096164.5A CN201880096164A CN112514213A CN 112514213 A CN112514213 A CN 112514213A CN 201880096164 A CN201880096164 A CN 201880096164A CN 112514213 A CN112514213 A CN 112514213A
Authority
CN
China
Prior art keywords
housing
connector
motor unit
bracket
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201880096164.5A
Other languages
Chinese (zh)
Inventor
土屋文昭
田中稔浩
小山大辅
春名延是
大平聪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2018147090 priority Critical
Priority to JP2018-147090 priority
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2018/040987 priority patent/WO2020026464A1/en
Publication of CN112514213A publication Critical patent/CN112514213A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes

Abstract

The motor unit (50) is provided with: a motor (10) having a 1 st housing (5) composed of a conductor; a 2 nd frame body (1a) which is composed of an insulator and is mounted to the 1 st frame body (5); a connector (2) which can be connected to a plug provided at the tip of the conductive cable and is fixed to the 2 nd housing (1 a); and a plate-like grounding member having a 1 st portion sandwiched between the connector (2) and the 2 nd housing (1a), and a 2 nd portion sandwiched between the 1 st housing (5) and the 2 nd housing (1 a).

Description

Motor unit
Technical Field
The present invention relates to a motor unit for fixing a connector.
Background
In the motor, in order to connect a conductive cable having a power supply line or the like for supplying power to the motor, a plug provided at a tip of the conductive cable is connected to and fixed to a connector provided in the motor. In the motor as described above, there is a case where a separate housing for fixing the connector is provided in addition to the housing of the motor. In this case, the housing of the motor and the connector do not directly contact each other, and a separate housing is interposed between the housing of the motor and the connector.
When the other housing is made of an insulator, the connector cannot be grounded via the housing of the motor simply by assembling the connector and the other housing except for the housing of the motor. Therefore, in order to ground the connector, it is necessary to prepare a dedicated member such as a lead wire, and fix both ends of the lead wire to both the connector and the housing of the motor by screws or fix both ends of the lead wire to both the connector and the housing of the motor by welding.
However, in the grounding using the lead, there is a problem that the number of working steps for attaching the lead by fastening or welding with a screw increases, and the efficiency of the work required for grounding decreases. Patent document 1 discloses a structure using a bendable grounding metal fitting. The metal fitting disclosed in patent document 1 has one end fixed to the shield plate with a screw, and the other end inserted into a hole formed in the substrate and bent to be fixed, thereby achieving the purpose of connecting the shield plate and the substrate with the metal fitting and grounding.
Patent document 1: japanese laid-open patent publication No. 5-290929
Disclosure of Invention
However, according to the above-described conventional technique, the other end can be fixed to the substrate by bending the metal fitting, and therefore, the work process required for grounding is facilitated, but the reliability of grounding is likely to fluctuate depending on the state of bending, and there is a problem that the robustness of the grounding performance is lowered.
The present invention has been made in view of the above circumstances, and an object thereof is to obtain a motor unit capable of improving the robustness of grounding performance while maintaining the facilitation of the work process required for grounding.
In order to solve the above problems and achieve the object, the present invention provides a motor unit including: a motor having a 1 st housing made of a conductor; a 2 nd housing made of an insulator and attached to the 1 st housing; a connector which can be connected to a plug provided at a front end of the conductive cable and is fixed to the 2 nd housing; and a plate-like grounding member having a 1 st part sandwiched between the connector and the 2 nd housing and a 2 nd part sandwiched between the 1 st housing and the 2 nd housing
ADVANTAGEOUS EFFECTS OF INVENTION
According to the motor unit of the present invention, the grounding performance can be improved in robustness while maintaining the ease of the work process required for grounding.
Drawings
Fig. 1 is a perspective view of a motor unit according to embodiment 1 of the present invention.
Fig. 2 is a partially enlarged oblique view partially enlarging a connector housing portion of the motor unit according to embodiment 1, and is a view showing a state in which a connection plug provided at a tip end of a conductive cable is connected to a connector.
Fig. 3 is a partially enlarged oblique view partially enlarging a connector housing portion of the motor unit according to embodiment 1, and is a view showing a state where a connection plug provided at a tip end of a conductive cable is detached from a connector.
Fig. 4 is a partially enlarged oblique view partially enlarging a connector housing portion of the encoder according to embodiment 1, and is a view showing a state where the connector is removed from the motor.
Fig. 5 is a perspective view of the grounding metal fitting in embodiment 1.
Fig. 6 is an oblique view of the grounding metal member shown in fig. 5 as viewed from the direction indicated by the arrow X.
Fig. 7 is a perspective view showing a 1 st modification of the ground metal fitting according to embodiment 1.
Fig. 8 is an oblique view of the grounding metal member shown in fig. 7, as viewed from the direction indicated by the arrow a.
Fig. 9 is a perspective view showing a 2 nd modification of the ground metal fitting according to embodiment 1.
Fig. 10 is a perspective view showing a 3 rd modification of the ground metal fitting according to embodiment 1.
Fig. 11 is a perspective view showing a 4 th modification of the ground metal fitting according to embodiment 1.
Fig. 12 is a perspective view showing a state in which the ground metal fitting and the connector according to modification 4 are attached to the encoder housing.
Fig. 13 is a perspective view showing a state in which the grounding metal fitting and the connector according to modification 4 are attached to the encoder housing and the connection plug is connected thereto.
Detailed Description
Hereinafter, a motor unit according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment.
Embodiment 1.
Fig. 1 is a perspective view of a motor unit according to embodiment 1 of the present invention. The motor unit 50 has a motor 10, an encoder 1, a connector 2, and a grounding metal 7. The motor 10 includes a stator housing 3, a load-side bracket 4, a non-load-side bracket 5, and a rotating shaft 6. The fixture frame 3 is formed of a conductor and has a cylindrical shape. Further, in embodiment 1, a case where the conductor is formed also includes a case where the outer peripheral surface of the object formed of an insulator is covered with the conductor. A fixing member, not shown, is fixed to the inside of the fixing member frame 3. The fixing member is formed in a cylindrical shape. A rotor is arranged on the inner side of the fixed part. A rotation shaft 6 is connected to the rotor.
The load-side bracket 4 is made of a conductor and closes an opening at one end of the fixture housing 3. The opposite-load side bracket 5 is a 1 st housing made of a conductor, and closes an opening on the other end side of the fixture housing 3. Bearings, not shown, are fixed to the load-side bracket 4 and the non-load-side bracket 5. The bearing fixed to the load-side bracket 4 and the bearing fixed to the non-load-side bracket 5 support the rotary shaft 6 rotatably. Thereby, the rotary shaft 6 and the rotor can be integrally rotated. A part of the rotary shaft 6 penetrates the load side bracket 4 and is exposed to the outside of the motor 10.
The encoder 1 is fixed to the non-load-side bracket 5 included in the motor 10. The encoder 1 includes an encoder housing 1 a. The encoder housing 1a is a 2 nd housing made of an insulator. A detector for detecting the rotational position of the motor 10 is provided inside the encoder housing 1 a. In addition, the illustration of the detector is omitted. Examples of the detector include a magnetic detector using a magnetic sensor, and a photodetector using a light emitting element and a light receiving element.
A connector housing 8 for fixing the connector 2 is integrally formed in the encoder housing 1 a. The 2 nd housing may be configured by including the connector housing 8 and the encoder housing 1a formed separately. Fig. 2 is a partially enlarged oblique view partially enlarging a connector housing portion of the motor unit according to embodiment 1, and is a view showing a state in which a connection plug provided at a tip end of a conductive cable is connected to a connector. Fig. 3 is a partially enlarged oblique view partially enlarging a connector housing portion of the motor unit according to embodiment 1, and is a view showing a state in which a connection plug provided at a tip end of a conductive cable is detached from a connector. Fig. 4 is a partially enlarged oblique view partially enlarging a connector housing portion of the encoder according to embodiment 1, and is a view showing a state in which the encoder is detached from the motor and the connector is detached from the encoder.
As shown in fig. 4, a connector contact surface 8a is formed in the connector housing portion 8. The connector contact surface 8a is a 1 st surface that faces the connector 2 and contacts the connector 2 in a state where the connector 2 is fixed. A plurality of screw holes 8b used when fixing the connector 2 are formed in the connector contact surface 8 a. A plurality of insertion holes 8c into which a part of the grounding metal fittings 7 described later is inserted are formed in the connector contact surface 8 a.
A recess 8d is formed in the connector contact surface 8a, and a terminal connected to a detector or the like provided inside the encoder housing 1a is provided in the recess 8 d. Although not shown, a plurality of terminals are provided in the recess 8 d. The plurality of terminals also include a terminal connected to the motor 10. In addition, when the motor 10 has an electromagnetic brake, the plurality of terminals further include a terminal connected to the electromagnetic brake. In addition, when a communication unit for communicating with an external device is provided inside the encoder housing 1a or in the motor 10, the plurality of terminals further include a terminal connected to the communication unit.
A bracket contact surface 8e is formed in the connector housing portion 8. The bracket contact surface 8e is the 2 nd surface that faces the non-load-side bracket 5 of the motor 10 and is in contact with the non-load-side bracket 5.
The connector 2 is fixed to the connector housing 8 of the encoder housing 1 a. The connector 2 is constituted by a conductor. As shown in fig. 2 and 3, the connector 2 is fixed to the connector housing 8 with screws 9. A screw 9 for fixing the connector 2 is screwed into a screw hole 8b formed in the connector contact surface 8 a. A connection plug 21 provided at the tip of the conductive cable 11 is connected to the connector 2. The conductive cable 11 is configured by integrating a plurality of wires.
The plurality of wires constituting the conductive cable 11 include a detection communication line for communication with a detector provided inside the encoder housing 1 a. The plurality of wires constituting the conductive cable 11 include power supply wires for supplying electric power to the motor 10. In the case where the motor 10 includes an electromagnetic brake, a brake power supply line for supplying electric power to the electromagnetic brake is included in the plurality of wires constituting the conductive cable 11. In addition, when a communication unit for communicating with an external device is provided inside the encoder housing 1a or in the motor 10, a network communication line for communicating with an external device is included in the plurality of wires constituting the conductive cable 11.
The connector 2 is formed with terminals that are connected to terminals provided in the connector housing 8 by fixing the connector 2 to the connector housing 8. By connecting the connector 2 to the connection plug 21 provided at the tip of the conductive cable 11, a plurality of wires constituting the conductive cable 11 are connected to the terminals of the connector 2. That is, the conductive cable 11 is connected to the detector or the like by fixing the connector 2 to the connector housing 8 and connecting the connection plug 21 to the connector 2. This enables communication with the detector, supply of electric power to the motor 10, supply of electric power to the electromagnetic brake, and communication with an external device via the conductive cable 11.
Fig. 5 is a perspective view of the grounding metal fitting in embodiment 1. Fig. 6 is an oblique view of the grounding metal member shown in fig. 5 as viewed from the direction indicated by the arrow X. The ground fitting 7 is a plate-like member made of a conductor. The grounding metal fitting 7 is formed by bending a plate-like member, and has a 1 st portion 7a and a 2 nd portion 7b with a bent portion interposed therebetween.
As shown in fig. 4, the ground fitting 7 is attached to the connector housing 8. The 1 st portion 7a is arranged on the connector contact surface 8a in a state where the ground fitting 7 is attached to the connector accommodating portion 8. As shown in fig. 5 and 6, a plurality of projections 12 are formed on the 1 st portion 7a, and the plurality of projections 12 are inserted into insertion holes 8c formed in the connector contact surface 8a in a state where the ground fitting 7 is attached to the connector housing 8. The protrusions 12 are formed with hook portions 12a, respectively, and the hook portions 12a project in a direction perpendicular to the insertion direction of the protrusions 12. By forming the hook portion 12a, the projection 12 is tapered toward the distal end. By forming the hook portion 12a, the projection 12 is not easily pulled out from the insertion hole 8c, and the ground fitting 7 is prevented from falling off. A projection hooked with the hook portion 12a may be formed inside the insertion hole 8 c.
The grounding metal fitting 7 attached to the connector housing portion 8 is less likely to fall off due to the projection 12 and the hook 12 a. Therefore, the assembly work of the motor unit 50 can be performed in a state where the ground fitting 7 is mounted in the connector housing portion 8 in advance. More specifically, the connector 2 and the encoder 1 can be fixed to the connector housing 8 and the motor 10 in a state where the grounding metal fitting 7 is attached to the connector housing 8 in advance. This can facilitate the work steps required for grounding the motor unit 50. In addition, if the grounding metal fitting 7 is attached to the connector housing 8 in advance, either the fixation of the connector 2 to the connector housing 8 or the fixation of the encoder 1 to the motor 10 may be performed first.
The 1 st portion 7a is formed with a through hole 13 communicating with a screw hole 8b formed in the connector contact surface 8 a. By fixing the connector 2 in the connector housing 8, the 1 st part 7a is sandwiched between the encoder housing 1a and the connector 2. Further, the screw 9 for fixing the connector 2 is inserted through the through hole 13 formed in the 1 st part 7a, and the connector 2 and the 1 st part 7a are fastened together with respect to the connector housing 8. This enables the portion around the through hole 13 in the 1 st part 7a to be reliably brought into contact with the connector 2.
The 2 nd portion 7b is disposed so as to contact the bracket contact surface 8e in a state where the ground fitting 7 is attached to the connector accommodating portion 8. The 2 nd part 7b has 2 protruding bosses 14a, 14 b. Further, 3 or more protrusions may be provided. The bosses 14a and 14b are formed with a boss projecting toward the opposite-load side bracket 5 and a boss projecting toward the encoder housing 1a on the back surface side thereof, but may be formed with a boss projecting toward either one.
The encoder 1 is fixed to the motor 10, and thereby the 2 nd part 7b is sandwiched between the encoder housing 1a and the opposite-load side bracket 5. A projection of the 2 projections 14a and 14b projecting toward the opposite-load side bracket 5 is in contact with the opposite-load side bracket 5. The 2 bosses 14a and 14b are projected toward the encoder housing 1a and are in contact with the encoder housing 1 a. The 2 nd portion 7b can be brought into contact with the non-load-side bracket 5 at the 2 positions by press-fitting the portion in contact with the encoder housing 1 a. That is, the ground fitting 7 is in contact with the opposite-load side bracket 5 at 2 locations. Further, since the 2 nd portion 7b has regions with different projecting amounts from the 1 st portion 7a, the distance from the outer edge of the motor 10 at the portion contacting the non-load-side bracket 5 can be made different depending on which region is provided.
Further, the projections 14a and 14b projecting toward the encoder housing 1a are formed instead of the projections 14a and 14b projecting toward the non-load-side bracket 5, whereby the assembling property of the motor 10 can be improved. As described above, the ground metal 7 is attached to the opposite-load side bracket 5 in a state where it is attached to the encoder housing 1 a. Therefore, when the bosses 14a and 14b projecting toward the opposite-to-load bracket 5 are formed, the bosses 14a and 14b may be caught by the opposite-to-load bracket 5 and the assembling property may be degraded when the opposite-to-load bracket 5 and the encoder housing 1a are aligned. On the other hand, if the projections 14a and 14b projecting toward the opposite-to-load side bracket 5 are not formed, the opposite-to-load side bracket 5 and the encoder housing 1a can be easily aligned, and the ease of assembly of the motor 10 can be improved. Further, on the bracket contact surface 8e of the encoder housing 1a, recesses may be formed at portions where the projections 14a and 14b are in contact, with a depth smaller than the height of the projections 14a and 14 b. The projections 14a and 14b are fitted into the recesses, whereby the positional displacement of the ground fitting 7 can be suppressed. Further, if the recesses are formed at a depth smaller than the height of the projections 14a, 14b, the projections 14a, 14b can be reliably brought into contact with the bottom portions of the recesses.
In the motor unit 50 described above, since the encoder housing 1a is made of an insulator, it is difficult to provide a ground path connecting the connector 2 to the non-load-side bracket 5 via the encoder housing 1 a. However, by providing the grounding metal fitting 7, as indicated by an arrow Y in fig. 2, 2 grounding paths can be provided from the connector 2 made of a conductor toward the opposite-load side bracket 5. That is, the 1 st portion 7a of the grounding metal fitting 7 contacting the connector 2, the 2 nd portion 7b continuing to the 1 st portion 7a, one boss 14a out of the 2 bosses 14a, 14b included in the 2 nd portion 7b, and the 1 st grounding path connecting the non-load-side bracket 5 contacting the one boss 14a are provided from the connector 2. Further, the 1 st portion 7a of the grounding metal fitting 7 contacting the connector 2, the 2 nd portion 7b continuing to the 1 st portion 7a, the other boss 14b among the 2 bosses 14a, 14b of the 2 nd portion 7b, and the 2 nd grounding path connecting to the non-load-side bracket 5 contacting the other boss 14b are provided from the connector 2. The non-load-side bracket 5 is grounded via a portion composed of a conductor, such as the fixture housing 3 or the load-side bracket 4, and an installation target device to which the motor unit 50 is installed. The portion of the stator frame 3 and the load-side bracket 4 that is formed of a conductor and located forward of the non-load-side bracket 5 is not limited to a conductor, and may be any member formed of a conductor and provided in the motor 10.
The grounding metal fitting 7 is sandwiched between the connector 2 and the encoder housing 1a and is secured in contact with the connector 2 in a series of operations for fixing the connector 2 to the encoder housing 1 a. In addition, the grounding metal fitting 7 is sandwiched between the encoder housing 1a and the non-load-side bracket 5 in a series of operations for fixing the encoder 1 to the motor 10, and is secured in contact with the non-load-side bracket 5. Therefore, since an extra work for fixing the grounding metal fitting 7 is hardly generated, the work process required for grounding the motor unit 50 can be simplified.
In the motor unit 50, the grounding metal fitting 7 is fixed by the simultaneous fastening of the 1 st portion 7a by the screw 9 and the sandwiching between the encoder housing 1a and the opposite-to-load side bracket 5, and therefore, the fixed state is less likely to fluctuate compared to a metal fitting fixed by bending. Therefore, it is easy to ensure stable grounding performance.
As compared with grounding using a lead wire, the contact point between the grounding metal fitting 7 and the connector 2 and the contact point between the grounding metal fitting 7 and the non-load-side bracket 5 can be made stronger. Further, since 2 ground paths are provided, even when 1 ground path is lost due to deformation of the encoder housing 1a due to, for example, temperature change or degradation with time, another 1 ground path can be secured. As described above, in the motor unit 50, the robustness of the grounding performance can be improved, and the noise resistance and the controllability of the motor 10 can be improved.
Further, since the 1 st portion 7a and the 2 nd portion 7b of the ground metal fitting 7 are plate-shaped, the contact area between the connector 2 and the non-load-side bracket 5 can be increased. Further, since the ground fitting 7 is sandwiched by the connector contact surface 8a and the bracket contact surface 8e which are continuous surfaces with edges in the connector housing portion 8, the distance between the contact portion with the connector 2 and the contact portion with the non-load-side bracket 5 can be shortened. For example, the distance between the contact point with the connector 2 and the contact point with the non-load-side bracket 5 can be shortened to about 3 mm.
As described above, the contact resistance can be further reduced by increasing the contact area between the connector 2 and the non-load-side bracket 5 and the ground fitting 7, and shortening the distance between the contact portion with the connector 2 and the contact portion with the non-load-side bracket 5. By further reducing the contact resistance, the controllability can be stabilized and the environmental resistance can be improved, and a more appropriate grounding structure can be obtained. Further, the contact between the connector 2 and the non-load-side bracket 5 and the ground fitting 7 may be achieved only by the plate surface without providing the projections 14a and 14 b.
Fig. 7 is a perspective view showing a 1 st modification of the ground metal fitting according to embodiment 1. Fig. 8 is an oblique view of the grounding metal member shown in fig. 7, as viewed from the direction indicated by the arrow a. In the ground fitting 7 according to modification 1, a plurality of projections 15a, 15b, 15c, and 15d are formed in the 2 nd portion 7 b. The plurality of projections 15a, 15b, 15c, 15d are formed to project toward the opposite-load side bracket 5 in a state where the ground fitting 7 is attached to the connector housing portion 8.
Therefore, each of the plurality of projections 15a, 15b, 15c, and 15d serves as a contact point to be brought into contact with the opposite-load side bracket 5. Therefore, when the ground fitting 7 according to modification 1 is used, 4 ground paths can be provided. In addition, the number of projections formed in the 2 nd portion 7b may be 3, or may be 5 or more. Further, the plurality of projections 15a, 15b, 15c, 15d may be projected toward the encoder housing 1 a. Further, a plurality of projections 15a, 15b, 15c, 15d projecting toward the opposite-to-load side bracket 5 and a plurality of projections 15a, 15b, 15c, 15d projecting toward the encoder housing 1a may be provided.
In addition, in the ground fitting 7 according to modification 1, the projecting directions of the hook portions 12a of the plurality of projections 12 are different from each other. More specifically, the projecting direction of the hook portion 12a formed at one projection 121 and the projecting direction of the hook portion 12a formed at the other projection 122 differ by 90 ° as viewed in the insertion direction of the projections 12. When a force is applied to the ground metal 7 attached to the encoder housing 1a, the projecting direction of the hook portion 12a is different, and the hook portion 12a different depending on the direction of the force is hooked inside the insertion hole 8 c. For example, when a force is applied to rotate the ground fitting 7 about the longitudinal direction of the 2 nd portion 7b, the hook 12a formed in one of the protrusions 121 is hooked in the insertion hole 8c, and the ground fitting 7 is prevented from wobbling. When a force is applied to rotate the ground fitting 7 about an axis perpendicular to the plate surface of the 2 nd segment 7b, the hook 12a formed on the one projection 121 is hooked in the insertion hole 8c, and the ground fitting 7 is prevented from wobbling. As described above, the ground fitting 7 is prevented from wobbling in response to forces applied in various directions, and the stability of the ground fitting 7 attached to the encoder housing 1a can be improved. As described above, the configuration in which the projection 12 and the hook 12a are provided on the ground fitting 7 and the configuration in which the projecting direction of the hook 12a is different can also be applied to the other ground fittings 7 exemplified in embodiment 1.
Fig. 9 is a perspective view showing a 2 nd modification of the ground metal fitting according to embodiment 1. An opening 16 extending in the longitudinal direction is formed in the 2 nd portion 7b of the ground metal fitting 7 according to the 2 nd modification. The portion where the opening 16 is formed is subjected to bending processing to project toward the non-load-side bracket 5. In the 2 nd portion 7b, projections 17a, 17b, and 17c projecting toward the opposite-load side bracket 5 are formed by bending processing. The projections 17a, 17b, and 17c constitute contacts that contact the opposite-load side bracket 5. The protrusions 17a, 17b, and 17c serve as the 1 st biasing portion that generates a biasing force in a direction to expand the gap between the encoder housing 1a and the opposite-to-load side bracket 5 by a restoring force when the 1 st biasing portion is pinched and crushed between the encoder housing 1a and the opposite-to-load side bracket 5.
When the gap between the encoder housing 1a and the non-load-side bracket 5 is enlarged by generating a biasing force by the protrusions 17a, 17b, and 17c as the contacts, the protrusions 17a, 17b, and 17c deform following the enlargement of the gap. Thus, even when the distance between the encoder housing 1a and the opposite-to-load side bracket 5 is increased, the protrusions 17a, 17b, and 17c are surely in contact with the opposite-to-load side bracket 5. In addition, the contact between the bosses 17a, 17b, and 17c and the non-load-side bracket 5 is ensured in response to an increase in the interval that may occur due to the dimensional tolerance of the encoder housing 1a and the dimensional tolerance of the non-load-side bracket 5, for example, an increase in the interval of ± 1mm or less. Further, the projections 15a, 15b, 15c, and 15d shown in fig. 7 are also formed of thin sheet metal parts so as to be convex in a cross section in an arc shape, and thereby generate a biasing force. For example, thin-walled sheet metal parts with a thickness of less than or equal to 0.35mm can be used.
Fig. 10 is a perspective view showing a 3 rd modification of the ground metal fitting according to embodiment 1. In the grounding metal fitting 7 according to modification 3, in addition to the projections 17a, 17b, and 17c shown in modification 2 of fig. 9, the portion in which the opening 16a is formed is also subjected to bending processing in the 1 st portion 7 a. Thereby, the 1 st part 7a is also formed with the projections 22a, 22b, 22c projecting toward the connector 2. The projections 22a, 22b, 22c constitute contacts that contact the connector 2. The projections 22a, 22b, and 22c serve as 2 nd biasing portions that generate biasing force in a direction to expand the gap between the encoder housing 1a and the connector 2 by the restoring force when the 2 nd biasing portions are pinched and crushed between the encoder housing 1a and the connector 2.
Fig. 11 is a perspective view showing a 4 th modification of the ground metal fitting according to embodiment 1. Fig. 12 is a perspective view showing a state in which the ground metal fitting and the connector according to modification 4 are attached to the encoder housing. Fig. 13 is a perspective view showing a state in which the grounding metal fitting and the connector according to modification 4 are attached to the encoder housing and the connection plug is connected thereto.
The grounding metal fitting 7 according to the 4 th modification example has the 3 rd portion 7c, and the 3 rd portion 7c is connected to the 2 nd portion 7b and sandwiched between the connection plug 21 and the connector 2. As shown in fig. 11, the 3 rd portion 7c is subjected to a bending process projecting toward the connection plug 21. In the 3 rd portion 7c, projections 18a and 18b are formed by bending processing so as to project toward the connection plug 21. The projections 18a, 18b constitute contacts which are brought into contact with the connection plug 21. The projecting portions 18a and 18b serve as 3 rd biasing portions that generate biasing force in a direction to expand the gap between the connection plug 21 and the connector 2 by the restoring force when the 3 rd biasing portions are pinched and crushed between the connection plug 21 and the connector 2. The number of the projections 18a and 18b formed in the 3 rd portion 7c is not limited to 2, and may be 1 or 3 or more.
When the ground fitting 7 according to modification 4 is used, the connection plug 21 is made of a conductor, and thus a ground path that is connected from the connection plug 21 to the opposite-load side bracket 5 via the ground fitting 7 without via the connector 2 can be provided. That is, the number of ground paths can be increased to improve the robustness of the grounding performance.
In the ground fitting 7 according to modification 4, the notch 19 shaped like "コ" is formed in the 2 nd portion 7 b. The portion surrounded by the notch 19 is bent toward the non-load-side bracket 5 to form a boss portion 20 serving as a contact. The boss portion 20 serves as a 1 st biasing portion that generates a biasing force in a direction to expand a gap between the encoder housing 1a and the opposite-load side bracket 5 by a restoring force when the 1 st biasing portion is pinched and crushed between the encoder housing 1a and the opposite-load side bracket 5. This makes it possible to bring the protrusions 18a and 18b as contacts into contact with the connector 2 in response to an increase in the distance between the encoder housing 1a and the non-load-side bracket 5.
The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.
Description of the reference numerals
1 encoder, 1a encoder frame, 2 connector, 3 fixture frame, 4 load side bracket, 5 load side bracket, 6 rotation axis, 7 grounding metal piece, 8 connector accommodating part, 8a connector contact surface, 8b screw hole, 8c insertion hole, 8d concave part, 8e bracket contact surface, 9 screw, 10 motor, 11 conductive cable, 12 convex part, 12a hook part, 13 through hole, 14a, 14b convex part, 15a, 15b, 15c, 15d convex part, 16 opening, 17a, 17b, 17c, 18a, 18b, 20 convex part, 19 notch, 21 connection plug, 50 motor unit, 121 one convex part, 122 another convex part.

Claims (12)

1. An electric motor unit, characterized by comprising:
a motor having a 1 st housing made of a conductor;
a 2 nd housing made of an insulator and attached to the 1 st housing;
a connector that can be connected to a plug provided at a distal end of the conductive cable and is fixed to the 2 nd housing; and
and a plate-shaped grounding member having a 1 st portion sandwiched between the connector and the 2 nd housing and a 2 nd portion sandwiched between the 1 st housing and the 2 nd housing.
2. The motor unit according to claim 1,
the 2 nd frame body has a 1 st surface and a 2 nd surface, the 1 st surface is in contact with the connector, the 2 nd surface is formed continuously with the 1 st surface and is in contact with the 1 st frame body,
the 1 st part is sandwiched between the 1 st face and the connector,
the 2 nd part is sandwiched between the 2 nd surface and the 1 st housing.
3. The motor unit according to claim 1 or 2,
the 2 nd portion is provided with a plurality of protrusions which are in contact with the 1 st frame or the 2 nd frame and protrude toward the 1 st frame or the 2 nd frame.
4. The motor unit according to claim 3,
a 1 st biasing portion that exerts biasing force in a direction in which a gap between the connector and the 1 st housing is enlarged is formed in the 2 nd portion, and the 1 st biasing portion serves as the projecting portion.
5. The motor unit according to any one of claims 1 to 4,
a2 nd pre-tightening part is formed in the 1 st part, and the 2 nd pre-tightening part exerts a pre-tightening force in a direction in which the interval between the 1 st frame body and the 2 nd frame body is enlarged.
6. The motor unit according to any one of claims 1 to 4,
the grounding member has a 3 rd portion, and the 3 rd portion is connected to the 2 nd portion and sandwiched between the header and the 2 nd housing.
7. The motor unit according to claim 6,
a 3 rd pre-tightening portion is formed in the 3 rd portion, and the 3 rd pre-tightening portion exerts a pre-tightening force in a direction in which the gap between the plug and the 2 nd housing is enlarged.
8. The motor unit according to any one of claims 1 to 7,
a plurality of holes are formed in the 2 nd frame body,
a plurality of projections are formed on the 1 st portion, the plurality of projections being inserted into the plurality of holes, respectively,
a hook portion is formed on each of the plurality of projections, and the hook portion protrudes in a direction perpendicular to an insertion direction of the projection to prevent the ground member from falling off from the hole.
9. The motor unit according to claim 8,
the hook portion is formed on one of at least 1 of the plurality of protrusions, and protrudes in a direction different from a protruding direction of the hook portion formed on the other protrusion.
10. The motor unit according to claim 9,
the projecting direction of the hook from the one projection and the projecting direction of the hook from the other projection differ by 90 ° when viewed in the insertion direction.
11. The motor unit according to any one of claims 1 to 10,
the conductive cable has: a power supply line for supplying electric power to the motor; and a detection communication line for communication with a detector provided inside the 1 st housing.
12. The motor unit according to claim 11,
the conductive cable further includes at least one of a brake power supply line for supplying power to an electromagnetic brake incorporated in the motor and a network communication line for network communication with an external device.
CN201880096164.5A 2018-08-03 2018-11-05 Motor unit Pending CN112514213A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2018147090 2018-08-03
JP2018-147090 2018-08-03
PCT/JP2018/040987 WO2020026464A1 (en) 2018-08-03 2018-11-05 Electric motor unit

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CN112514213A true CN112514213A (en) 2021-03-16

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WO (1) WO2020026464A1 (en)

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CN111245137B (en) * 2020-03-16 2020-12-11 雷勃电气(无锡)有限公司 Chassis dynamometer motor base with torque detection and radial cooling functions

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6528913B1 (en) * 1999-11-19 2003-03-04 Emerson Electric Co. Electric device grounding system
JP5592686B2 (en) * 2010-04-05 2014-09-17 アスモ株式会社 motor
JP5641346B2 (en) * 2011-03-15 2014-12-17 住友電装株式会社 Shield shell mounting structure
KR101442414B1 (en) * 2013-05-23 2014-09-24 뉴모텍(주) Ground structure for motor
JP6476002B2 (en) * 2015-02-19 2019-02-27 日立オートモティブシステムズ株式会社 Electronic control device, motor control device, and electric fluid pump
JP6633213B2 (en) * 2016-09-12 2020-01-22 三菱電機株式会社 Motor control device and electric power steering control device
JP6809246B2 (en) * 2017-01-21 2021-01-06 株式会社デンソー Motor device

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