CN113169620A

CN113169620A - Electric motor

Info

Publication number: CN113169620A
Application number: CN201880100043.3A
Authority: CN
Inventors: 田中稔浩; 长谷川治之; 土屋文昭
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2021-07-23
Anticipated expiration: 2038-12-14
Also published as: WO2020121529A1; DE112018008135T5; JPWO2020121529A1; CN113169620B; DE112018008135B4; JP6584730B1

Abstract

The motor has: a cylindrical stator; a rotor which is disposed inside the stator and is rotatably supported; a brake that restricts rotation of the rotor; a detector that detects rotation of the rotor; and 1 connector (12) provided with a plurality of terminals. A connector (12) is provided with: a power terminal (31) connected to a power line for transmitting electric power for rotating the rotor; a brake terminal (41) to which a brake wire for transmitting electric power to the brake is connected; and a signal terminal (51) connected to a signal line for transmitting a signal from the detector. A region (42) for disposing the brake terminal (41) is provided between a region (32) for disposing the power terminal (31) and a region (52) for disposing the signal terminal (51). Further, a metallic shield plate (23) is provided between the region (32) and the region (52).

Description

Electric motor

Technical Field

The present invention relates to a motor provided with a connector.

Background

The motor may include: a power line that transmits electric power for rotating the rotor; a brake line that transmits electric power for operating a brake that restricts rotation of the rotor; and a signal line that transmits the electric signal from the detector. The motor described above includes the following connectors for connecting external wiring to the power lines, the brake lines, and the signal lines: the connector includes a connector provided with a terminal connected to a power line, a connector provided with a terminal connected to a brake line, and a connector provided with a terminal connected to a signal line.

A plug mounted on the connector is provided at the tip of the external wiring connected to the connector. By arranging the terminals collectively in 1 connector, the number of steps for mounting a plug on the connector can be reduced. Patent document 1 discloses a plug that can be mounted on a connector in which a plurality of types of terminals are arranged in a group.

Patent document 1: japanese patent laid-open publication No. 2016-018748

Disclosure of Invention

In the configuration disclosed in patent document 1, there are a power line for actuating an actuator, a power line for supplying power to measuring devices, and a signal line for controlling the actuator and for measuring devices, and by disposing the power line between the power line and the signal line, the signal line can be disposed at a position where a distance from the power line is secured, and by disposing a conductive noise shielding member between the power line, and the signal line, noise immunity performance can be improved. However, since the power lines are disposed adjacent to each other, although the power lines are separated by the noise shielding member, noise from the power lines is superimposed on the power lines, and thus there is a possibility that the measuring devices are erroneously operated, and it is necessary to secure a distance from the power lines to the power lines.

The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a motor capable of arranging a plurality of types of terminals in a connector in a lump and reducing the influence of noise on a signal line.

In order to solve the above problems and achieve the object, the present invention includes: a cylindrical stator; a rotor which is disposed inside the stator and is rotatably supported; a brake that restricts rotation of the rotor; a detector that detects rotation of the rotor; and 1 connector provided with a plurality of terminals. The connector is provided with: a 1 st terminal connected to a power line for transmitting electric power for rotating the rotor; a 2 nd terminal to which a brake wire for transmitting electric power to the brake is connected; and a 3 rd terminal connected to a signal line for transmitting a signal from the detector. A region for disposing the 2 nd terminal is provided between a region for disposing the 1 st terminal and a region for disposing the 3 rd terminal. The connector further includes a metallic shield plate provided between a region where the 1 st terminal is disposed and a region where the 3 rd terminal is disposed.

ADVANTAGEOUS EFFECTS OF INVENTION

The motor according to the present invention has an effect that a plurality of types of terminals can be collectively arranged in a connector, and an effect of noise on a signal line can be reduced.

Drawings

Fig. 1 is a sectional view of a motor according to embodiment 1 of the present invention.

Fig. 2 is a view of the connector viewed along line a shown in fig. 1.

Fig. 3 is a view showing a 1 st modification of the connector according to embodiment 1.

Fig. 4 is a view showing a 2 nd modification of the connector according to embodiment 1.

Fig. 5 is a diagram showing a 3 rd modification of the connector according to embodiment 1.

Fig. 6 is a diagram showing a 4 th modification of the connector according to embodiment 1.

Fig. 7 is a view showing a 5 th modification of the connector according to embodiment 1.

Detailed Description

Hereinafter, a motor 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 embodiments.

Embodiment 1.

Fig. 1 is a sectional view of a motor according to embodiment 1 of the present invention. The motor 101 is a servo motor capable of realizing feedback control based on a result of detecting the rotation of the motor 101. In fig. 1, the right side in the paper plane is the load side, which is the side of the motor 101 that connects the load, and the left side in the paper plane is the opposite side to the load.

The motor 101 includes a cylindrical stator 3 and a rotor 2 disposed inside the stator 3. The shaft 1 is connected to the rotor 2. The shaft portion 1 is supported rotatably about a rotation axis N by a bearing 7 provided on a load side and a bearing 8 provided on an opposite load side. In the motor 101, a magnetic field is generated by supplying power to the stator 3, and the rotor 2 and the shaft portion 1 rotate by an interaction between the magnetic field generated by the stator 3 and the magnetic field generated by the rotor 2.

The 1 st bracket 4, the frame 5, the 2 nd bracket 6, and the detector cover 10 constitute a housing of the motor 101. The stator 3 is pressed into the frame 5. The 1 st bracket 4 is provided on the load side of the frame 5. The bearing 7 is supported by the 1 st bracket 4. The 2 nd bracket 6 is provided on the opposite side to the load from the frame 5. The bearing 8 rotatably supports the shaft portion 1 on the opposite side to the load of the rotor 2. The plate spring 9 is a preload spring provided in a gap between the 1 st bracket 4 and the bearing 7. The preload applied to the bearing 7 by the leaf spring 9 reduces the vibration of the bearing 7.

The motor 101 includes, on the opposite side to the load of the 2 nd bracket 6: a brake 20 that forcibly stops the rotation of the shaft portion 1; and a brake cover 22 that houses the brake 20. For example, the brake 20 is in contact with the shaft portion 1 in a state where electric power is not supplied to restrict rotation of the shaft portion 1, and is separated from the shaft portion 1 in a state where electric power is supplied to enable rotation of the shaft portion 1.

The motor 101 includes: a detector 11 that detects the rotational position of the shaft portion 1 and outputs an electric signal indicating the detection result; and a detector cover 10 that houses the detector 11. The detector cover 10 is disposed on the opposite side of the load from the 2 nd bracket 6. The detector cover 10 is a cylindrical body having a load-opposing end closed, and is formed in a cylindrical shape. Blocked by the brake cover 22.

The detector 11 has: a disk 13 attached to the shaft 1; and a circuit board 14 that is a circuit portion that outputs an electric signal indicating a detection result of the rotational position of the shaft portion 1. The rotational position indicates a rotational angle about the rotational axis N. The detector 11 includes a case 15, and the case 15 covers a surface of the circuit board 14 facing the load side and accommodates the disk 13. The end of the shaft portion 1 on the opposite side to the load enters the inside of the housing 15. The disk 13 is attached to the end of the shaft 1 on the opposite side to the load and rotates together with the shaft 1.

The detector 11 is an optical encoder that detects the rotational position of the shaft portion 1 by detecting light transmitted through the disk 13 or reflected by the disk 13. The detector 11 may be a magnetic encoder that detects the rotational position of the shaft 1 based on an electric signal obtained by detecting a change in a magnetic field caused by rotation of a permanent magnet or an induction coil.

The detector cover 10 is provided with 1 connector 12. The connector 12 is provided with a plurality of terminals described later. A power line 16, a brake line 21, or a signal line 17 is connected to each terminal provided in the connector 12, the power line 16 transmits electric power for rotating the rotor 2, the brake line 21 transmits electric power for operating the brake 20, and the signal line 17 transmits an electric signal from the detector 11.

Fig. 2 is a view of the connector viewed along line a shown in fig. 1. The connector 12 is provided with: a power terminal 31 serving as a 1 st terminal connected to the power line 16, a brake terminal 41 serving as a 2 nd terminal connected to the brake line 21, and a signal terminal 51 serving as a 3 rd terminal connected to the signal line 17. In the motor 101 according to embodiment 1, the power terminal 31, the brake terminal 41, and the signal terminal 51 are integrated into 1 connector 12, thereby reducing the manufacturing cost of the motor 101 and the number of connecting steps of the plug to the connector 12.

Next, the arrangement of the power terminal 31, the brake terminal 41, and the signal terminal 51 in the connector 12 will be described. In the connector 12, a region 42 in which the brake terminal 41 is arranged is provided between a region 32 in which the power terminal 31 is arranged and a region 52 in which the signal terminal 51 is arranged.

According to the electric motor 101 described above, the power terminal 31, the brake terminal 41, and the signal terminal 51 are collectively arranged in 1 connector 12, so that the number of steps for attaching the plug to the connector 12 can be reduced as compared with the case where the power terminal 31, the brake terminal 41, and the signal terminal 51 are arranged in separate connectors. In addition, the number of connectors 12 can be reduced, and the manufacturing cost of the motor 101 can be reduced.

In addition, according to the arrangement of the

areas

32, 42, and 52, the power terminal 31 arranged in the area 32 and the signal terminal 51 arranged in the area 52 are separated from each other by the brake terminal 41 arranged in the area 42.

A large amount of on-off noise is generated from the power line 16 connected to the power terminal 31. If the power line 16 connected to the power terminal 31 and the signal line 17 connected to the signal terminal 51 are too close to each other, on-off noise generated in the power line 16 may be mixed into an electric signal transmitted through the signal line 17, for example, and the motor 101 may malfunction.

When the power terminal 31, the brake terminal 41, and the signal terminal 51 are collectively provided for 1 connector 12, the power line 16 and the signal line 17 are easily accessible. In the electric motor 101 according to embodiment 1, the power terminal 31 and the signal terminal 51 are separated from each other by the brake terminal 41 disposed in the region 42, and therefore the power line 16 and the signal line 17 connected thereto are easily separated from each other.

Therefore, the mixing of the on-off noise generated by the power line 16 into the electric signal transmitted through the signal line 17 can be suppressed. That is, the

terminals

31, 41, and 51 can be grouped into 1 connector 12, thereby reducing the manufacturing cost and the number of connecting steps of the plug, suppressing the influence of on-off noise on the signal line 17, and improving the reliability of the operation of the motor 101. Further, since the noise generated from the brake wire 21 is smaller than the noise generated from the power wire 16, the influence given to the signal wire 17 by the noise generated from the brake wire 21 is small.

Further, when the brake 20 is not provided in the motor 101, the brake terminals 41 are short-circuited in advance, whereby the influence of on-off noise can be suppressed, and the reliability of the operation of the motor 101 can be further improved.

Further, the connector 12 can be downsized by forming the connector 12 as an angle-type connector.

Fig. 3 is a view showing a 1 st modification of the connector according to embodiment 1. The connector 12 according to modification 1 is provided with a shield plate 23 that shields a region 42 where the brake terminals 41 are arranged and a region 52 where the signal terminals 51 are arranged. The shield plate 23 is made of metal, for example. By providing the shield plate 23, the influence of on-off noise on the signal line 17 can be further suppressed, and the reliability of the operation of the motor 101 can be further improved. The shielding plate 23 may be provided between the region 32 where the power terminal 31 is disposed and the region 42 where the brake terminal 41 is disposed.

Fig. 4 is a view showing a 2 nd modification of the connector according to embodiment 1. In the connector 12 according to modification 2, the region in which the signal terminals 51 are arranged is further defined according to the function thereof. First, the signal terminal 51 includes: a detector power supply terminal 51a connected to a detector power supply line that transmits power to the detector 11, among the signal lines 17; and a detector signal terminal 51b connected to a detector signal line for transmitting an electric signal as a position detection signal from the detector 11.

In the connector 12 according to modification 2, a region 52a in which the detector power supply terminals 51a are arranged is provided between the region 52b in which the detector signal terminals 51b are arranged and the region 42 in which the brake terminals 41 are arranged. This further separates the power terminal 31 and the detector signal terminal 51b, and thus can more reliably suppress the mixing of the on-off noise from the power line 16 into the electric signal transmitted through the detector signal line. Therefore, the reliability of the operation of the motor 101 can be further improved.

In fig. 4, although an example in which the shield plate 23 is provided is shown, the shield plate 23 is not necessarily provided. Even if the shield plate 23 is not provided, the arrangement of the

terminals

31, 41, 51a, and 51b can provide an effect of suppressing the mixing of on-off noise into the electric signal.

Fig. 5 is a diagram showing a 3 rd modification of the connector according to embodiment 1. The connector 12 according to modification 3 is provided with a grounding terminal 61 that is the 4 th terminal connected to a grounding line. In the connector 12 according to modification 3, the region 62 in which the ground terminals 61 are arranged is provided on the opposite side of the region 52 in which the signal terminals 51 are arranged, with the region 42 in which the brake terminals 41 are arranged interposed therebetween. As in the case of the examples described above, the signal terminal 51 and the power terminal 31 can be separated from each other, so that the influence of on-off noise can be reduced, and the reliability of the operation of the motor 101 can be improved. Further, the ground wire and the power wire 16 have the same wire diameter in many cases, and the connector 12 can be downsized by combining wires having the same wire diameter.

In fig. 5, although an example in which the shield plate 23 is provided is shown, the shield plate 23 is not necessarily provided. Even if the shield plate 23 is not provided, the arrangement of the

terminals

31, 41, 51, 61 can provide an effect of suppressing the mixing of on-off noise into the electric signal.

Fig. 6 is a diagram showing a 4 th modification of the connector according to embodiment 1. The ground terminal 61, which has less influence of noise on the signal line 17 than the power line 16, is provided between the region 32 where the power terminals 31 are arranged and the region 52 where the signal terminals 51 are arranged. With this configuration, in the connector 12 according to modification 4, 3 rows of terminals are arranged in the 2 nd direction, which is a direction perpendicular to the 1 st direction, which is an arrangement direction of the

regions

32, 42, 52. Further, the region 42 in which the brake terminals 41 are arranged and the region 62 in which the ground terminals 61 are arranged are aligned in the 2 nd direction. With this configuration, the connector 12 in the 1 st direction can be downsized. Further, since the power terminal 31 and the signal terminal 51 can be separated from each other, the influence of on-off noise can be reduced, and the reliability of the operation of the motor 101 can be improved. In fig. 6, although an example in which the shield plate 23 is provided is shown, the shield plate 23 is not necessarily provided. Even if the shield plate 23 is not provided, the arrangement of the

terminals

Fig. 7 is a view showing a 5 th modification of the connector according to embodiment 1. In the connector 12 according to the modification 5, the terminals arranged in the 2 nd direction are 1 row. The region 62 where the ground terminal 61 is disposed is provided between the region 32 where the power terminal 31 is disposed and the region 42 where the brake terminal 41 is disposed.

With this arrangement, the connector 12 in the 2 nd direction can be downsized, and the influence of on-off noise can be reduced by separating the power terminal 31 and the signal terminal 51, thereby improving the reliability of the operation of the motor 101. In fig. 7, although an example in which the shield plate 23 is provided is shown, the shield plate 23 is not necessarily provided. Even if the shield plate 23 is not provided, the arrangement of the

terminals

The configurations described in the above embodiments are merely examples of the contents of the present invention, and may be combined with other known techniques, and some of the configurations may be omitted or modified without departing from the scope of the present invention.

Description of the reference numerals

1 shaft part, 2 rotors, 3 stators, 41 st bracket, 5 frames, 6 nd bracket, 2 nd bracket, 7 and 8 bearings, 9 plate springs, 10 detector covers, 11 detectors, 12 connectors, 13 disks, 14 circuit substrates, 15 shells, 16 power lines, 17 signal lines, 20 brakes, 21 brake lines, 22 brake covers, 23 shielding plates, 31 power terminals, 32, 42, 52a, 52b and 62 areas, 41 brake terminals, 51 signal terminals, 51a detector power terminals, 61 grounding terminals and 101 motors.

Claims

1. An electric motor, comprising:

a cylindrical stator;

a rotor disposed inside the stator and rotatably supported;

a brake that restricts rotation of the rotor;

a detector that detects rotation of the rotor; and

1 connector provided with a plurality of terminals,

the connector is provided with:

a 1 st terminal connected to a power line for transmitting electric power for rotating the rotor;

a 2 nd terminal to which a brake wire for transmitting electric power to the brake is connected; and

a 3 rd terminal connected to a signal line for transmitting a signal from the detector,

a region in which the 2 nd terminal is arranged is provided between a region in which the 1 st terminal is arranged and a region in which the 3 rd terminal is arranged,

the connector further includes a metallic shield plate provided between a region where the 1 st terminal is disposed and a region where the 3 rd terminal is disposed.

2. The motor according to claim 1,

the 3 rd terminal includes: a detector power supply terminal connected to a detector power supply line that transmits power to the detector; and a detector signal terminal connected to a detector signal line for transmitting an electric signal from the detector,

an area in which the detector power supply terminals are arranged is provided between an area in which the 2 nd terminal is arranged and an area in which the detector signal terminals are arranged.

3. The motor according to claim 1 or 2,

a 4 th terminal is provided on the connector, the 4 th terminal is connected to a ground line,

the region in which the 4 th terminal is arranged is provided on the opposite side of the region in which the 3 rd terminal is arranged with the 2 nd terminal interposed therebetween.

4. The motor according to claim 1 or 2,

when the direction in which the 1 st terminal arrangement region, the 2 nd terminal arrangement region, and the 3 rd terminal arrangement region are arranged is the 1 st direction, and the direction perpendicular to the 1 st direction is the 2 nd direction, the 1 st terminal, the 2 nd terminal, and the 3 rd terminal are arranged in 3 columns in the 2 nd direction.

5. The motor according to claim 1 or 2,

when the direction in which the 1 st terminal arrangement region, the 2 nd terminal arrangement region, and the 3 rd terminal arrangement region are arranged is the 1 st direction, and the direction perpendicular to the 1 st direction is the 2 nd direction, the 1 st terminal, the 2 nd terminal, and the 3 rd terminal are arranged in 1 column in the 2 nd direction.

6. The motor according to any one of claims 1 to 5,

the connector is of an angle type.