NZ740769A - Servo motor - Google Patents
Servo motor Download PDFInfo
- Publication number
- NZ740769A NZ740769A NZ740769A NZ74076918A NZ740769A NZ 740769 A NZ740769 A NZ 740769A NZ 740769 A NZ740769 A NZ 740769A NZ 74076918 A NZ74076918 A NZ 74076918A NZ 740769 A NZ740769 A NZ 740769A
- Authority
- NZ
- New Zealand
- Prior art keywords
- rotor
- brake
- encoder
- fixed
- stator
- Prior art date
Links
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/106—Structural association with clutches, brakes, gears, pulleys or mechanical starters with dynamo-electric brakes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/225—Detecting coils
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Braking Arrangements (AREA)
Abstract
An objective of the present invention is to provide a servo motor which has a more compact structure and in which it is convenient to mount and dismount the encoder and the brake and the axial position of the encoder relative to the brake is more stable. The servo motor comprises a rotor shaft having an end extending through an end cover to an outer side of the motor; a brake assembly and an encoder assembly are fixed on the outer side of the motor; a brake rotor is sleeved fixedly on the rotor shaft, the brake rotor consists of a first brake rotor segment and a second brake rotor segment, the brake stator is sleeved on the first brake rotor segment and fixed to the end cover, and an outer edge of the second brake rotor segment is located on an outer side of an outer edge of the first brake rotor segment; an encoder rotor is sleeved on the rotor shaft, the brake rotor is located between the encoder rotor and the end cover, a shaft sleeve which is sleeved on the rotor shaft is provided between the encoder rotor and the second brake rotor segment, a gasket is provided on an axial side of the rotor shaft, and the gasket is fixed to the rotor shaft via a first fastener so that the gasket is resisted against an axial end face of the encoder rotor.
Description
SERVO MOTOR
Technical Field of the Invention
The present invention relates to a servo motor.
Background of the Invention
A rotary encoder is usually mounted in a servo motor. The existing
encoder has an axial movement relative to the rotor shaft, the performance of
the encoder is low, and the structure for fixing the encoder with the motor is
quite complicated so that the whole motor is relatively large in size.
Summary of the Invention
An objective of the present invention is to provide a servo motor which has
a more compact structure and in which it is convenient to mount and dismount
the encoder and the brake and the axial position of the encoder relative to the
brake is more stable.
For this purpose, the present invention employs the following technical
solution. A servo motor is provided, including a rotor shaft having an end
extending through an end cover to an outer side of the motor; a brake
assembly and an encoder assembly are fixed on the outer side of the motor;
the brake assembly comprises a brake stator and a brake rotor which is
sleeved fixedly on the rotor shaft, the brake rotor consists of a first brake rotor
segment and a second brake rotor segment, the brake stator is sleeved on the
first brake rotor segment and fixed to the end cover, and an outer edge of the
second brake rotor segment is located on an outer side of an outer edge of the
first brake rotor segment; the encoder assembly comprises an encoder rotor
which is sleeved on the rotor shaft, the brake rotor is located between the
encoder rotor and the end cover, a shaft sleeve which is sleeved on the rotor
shaft is provided between the encoder rotor and the second brake rotor
segment, a gasket is provided on an axial side of the rotor shaft, and the
gasket is fixed to the rotor shaft via a first fastener so that the gasket is resisted
against an axial end face of the encoder rotor; and the shaft sleeve is limited
between the brake rotor and the encoder rotor, and the encoder rotor is limited
between the shaft sleeve and the gasket.
During the mounting of the encoder in the present invention, the shaft
sleeve is sleeved on the rotor shaft, the encoder rotor is then sleeved on the
rotor shaft, the gasket is fixed to the rotor shaft to compress the encoder rotor
onto the shaft sleeve, and the shaft sleeve is then compressed onto the brake
rotor. In this way, the encoder rotor is axially fixed to avoid the change in the
axial position of the encoder rotor. The motor of the present invention has a
compact structure. The brake rotor can be fixed while realizing the fixation of
the encoder rotor. In the present invention, it is quite convenient to mount, fix
and dismount the encoder assembly and the brake assembly of the motor.
Preferably, an annular side plate is formed on the end cover, and an end
of the side plate away from the end cover is fixed to a fixed plate on which an
encoder stator is fixed; a through hole for allowing the shaft sleeve to pass
therethrough is formed on the fixed plate; and the brake stator is located on an
inner side of the side plate. This arrangement is used for the fixation of the
encoder stator.
Preferably, a bearing chamber for accommodating a bearing is formed on
the end cover; the bearing has an inner ring fixed to the rotor shaft and an
outer ring fixed to an inner wall of the bearing chamber; and by the action of
the first fastener and the gasket, an axial surface of the first brake rotor
segment of the brake rotor is resisted against the inner ring of the bearing. By
compressing the brake rotor to lock the inner ring of the bearing, it is more
convenient for the assembly of the motor in the present invention. In the brake
rotor of the present invention, using the end face of the bearing as a reference
surface can effectively ensure the size of the brake air-gap, and the firmness of
mounting is better.
Preferably, the bearing has a thickness greater than a depth of the bearing
chamber, and an axial end face of a side of the bearing is extended to an outer
side of the end cover; the brake stator is fixed to the end cover via a plurality of
second fasteners, and an inner edge of the brake stator is brought into contact
with the outer ring of the bearing; and a gap is formed between the brake stator
and the axial end face of the end cover. By compressing the brake stator to
lock the outer ring of the bearing, it is more convenient for the assembly of the
motor in the present invention.
Preferably, a gap of 2 mm is formed between the brake stator and the
axial end face of the end cover.
Preferably, an annular positioning bulge is formed on the end cover, and
the positioning bulge has an inner edge which is in a same shape as the outer
edge of the brake stator. This arrangement facilitates the positioning and
fixation of the brake stator.
Preferably, a positioning groove is formed on the fixed plate, and the
positioning groove has a circumferential inner wall which is in a same shape as
a circumferential outer edge of the encoder stator; and the encoder stator is
fixed to the fixed plate so that the encoder stator is partially located within the
positioning groove.
Preferably, the gasket is fixed to the rotor shaft so that a gap is formed
between the gasket and the axial end face of the rotor shaft.
The present invention has the advantages that the motor has a more
compact structure, it is convenient to mount and dismount the encoder and the
brake and the axial position of the encoder relative to the brake is more stable.
Brief Description of the Drawings
Fig. 1 is a structure diagram of the present invention.
Detailed Description of the Invention
The present invention will be further described below by specific
embodiments with reference to the accompanying drawings.
As shown in Fig. 1, a servo motor of the present invention includes a rotor
shaft 1 having an end extending through an end cover 2 to an outer side of the
motor; a brake assembly and an encoder assembly are fixed on the outer side
of the motor; the brake assembly comprises a brake stator 3 and a brake rotor
4 which is sleeved fixedly on the rotor shaft 1 via a spline 11, the brake rotor 4
consists of a first brake rotor segment 41 and a second brake rotor segment 42,
the brake stator 3 is sleeved on the circumferential outer side of the first brake
rotor segment 41 and fixed to the end cover, and an outer edge of the second
brake rotor segment 42 is located on an outer side of an outer edge of the first
brake rotor segment 41.The encoder assembly comprises an encoder rotor 5
which is sleeved on the rotor shaft 1 and an encoder stator 6, the brake rotor 4
is located between the encoder rotor 5 and the end cover 2, a shaft sleeve 7
which is sleeved on the rotor shaft 1 is provided between the encoder rotor 6
and the second brake rotor segment 42, a gasket 8 is provided on an axial side
of the rotor shaft 1, and the gasket 8 is fixed to the rotor shaft 1 via a first
fastener 12 so that the gasket 8 is resisted against an axial end face of the
encoder rotor 5; and the shaft sleeve 7 is limited between the brake rotor 4 and
the encoder rotor 6, and the encoder rotor 6 is limited between the shaft sleeve
7 and the gasket 8.An air-gap is formed between the second brake rotor
segment 42 and the axial surface of the brake stator 3 and between the first
brake rotor segment 41 and the circumferential inner end face of the brake
stator 3, respectively. The gasket 8 is fixed to the rotor shaft 1 so that a gap is
formed between the gasket 8 and the axial end face of the rotor shaft 1.
An annular side plate 21 is formed on the end cover 2, and an end of the
side plate 21 away from the end cover is fixed to a fixed plate 22 on which an
encoder stator 6 is fixed; a through hole for allowing the shaft sleeve 7 to pass
therethrough is formed on the fixed plate 22; and the brake stator 3 is located
on an inner side of the side plate 21.A bearing chamber for accommodating a
bearing 9 is formed on the end cover 2; the bearing 9 has an inner ring fixed to
the rotor shaft 1 and an outer ring fixed to an inner wall of the bearing chamber;
and by the action of the first fastener 12 and the gasket 8, an axial surface of
the first brake rotor segment 41 of the brake rotor 4 is resisted against an axial
end face of the inner ring of the bearing 9.The bearing 9 has a thickness
greater than a depth of the bearing chamber, and an axial end face of a side of
the bearing 9 is extended to an outer side of the end cover 2; the brake stator 3
is fixed to the end cover 2 via a plurality of second fasteners 13, and an inner
edge of the brake stator 3 is brought into contact with the outer ring of the
bearing 9; and a gap of 2 mm is formed between the brake stator 3 and the
axial end face of the end cover 2.
An annular positioning bulge 23 is formed on the end cover 2, and the
positioning bulge 23 has an inner edge which is in a same shape as the outer
edge of the brake stator 3.A positioning groove is formed on the fixed plate 22,
and the positioning groove has a circumferential inner wall which is in a same
shape as a circumferential outer edge of the encoder stator 6; and the encoder
stator 6 is fixed to the fixed plate 22 so that the encoder stator is partially
located within the positioning groove.
During the mounting of the encoder in the present invention, the shaft
sleeve is sleeved on the rotor shaft, the encoder rotor is then sleeved on the
rotor shaft, the gasket is fixed to the rotor shaft to compress the encoder rotor
onto the shaft sleeve, and the shaft sleeve is then compressed onto the brake
rotor. In this way, the encoder rotor is axially fixed to avoid the change in the
axial position of the encoder rotor. The motor of the present invention has a
compact structure. The brake rotor can be fixed while realizing the fixation of
the encoder rotor. In the present invention, it is quite convenient to mount, fix
and dismount the encoder assembly and the brake assembly of the motor.
Furthermore, in the brake rotor of the present invention, using the end face of
the bearing as a reference surface can effectively ensure the size of the brake
air-gap, and the firmness of mounting of the brake is better.
Claims (8)
1. A servo motor, comprising a rotor shaft having an end extending through an end cover to an outer side of the motor; a brake assembly and an encoder assembly are fixed on the outer side of the motor; the brake assembly comprises a brake stator and a brake rotor which is sleeved fixedly on the rotor shaft, the brake rotor consists of a first brake rotor segment and a second brake rotor segment, the brake stator is sleeved on the first brake rotor segment and fixed to the end cover, and an outer edge of the second brake rotor segment is located on an outer side of an outer edge of the first brake rotor segment; the encoder assembly comprises an encoder rotor which is sleeved on the rotor shaft, the brake rotor is located between the encoder rotor and the end cover, a shaft sleeve which is sleeved on the rotor shaft is provided between the encoder rotor and the second brake rotor segment, a gasket is provided on an axial side of the rotor shaft, and the gasket is fixed to the rotor shaft via a first fastener so that the gasket is resisted against an axial end face of the encoder rotor; and the shaft sleeve is limited between the brake rotor and the encoder rotor, and the encoder rotor is limited between the shaft sleeve and the gasket.
2. The servo motor according to claim 1, characterized in that an annular side plate is formed on the end cover, and an end of the side plate away from the end cover is fixed to a fixed plate on which an encoder stator is fixed; a through hole for allowing the shaft sleeve to pass therethrough is formed on the fixed plate; and the brake stator is located on an inner side of the side plate.
3. The servo motor according to claim 1, characterized in that a bearing chamber for accommodating a bearing is formed on the end cover; the bearing has an inner ring fixed to the rotor shaft and an outer ring fixed to an inner wall of the bearing chamber; and by the action of the first fastener and the gasket, an axial surface of the first brake rotor segment of the brake rotor is resisted against the inner ring of the bearing.
4. The servo motor according to claim 3, characterized in that the bearing has a thickness greater than a depth of the bearing chamber, and an axial end face of a side of the bearing is extended to an outer side of the end cover; the brake stator is fixed to the end cover via a plurality of second fasteners, and an inner edge of the brake stator is brought into contact with the outer ring of the bearing; and a gap is formed between the brake stator and the axial end face of the end cover.
5. The servo motor according to claim 4, characterized in that a gap of 2 mm is formed between the brake stator and the axial end face of the end cover.
6. The servo motor according to claim 4, characterized in that an annular positioning bulge is formed on the end cover, and the positioning bulge has an inner edge which is in a same shape as the outer edge of the brake stator.
7. The servo motor according to claim 2, characterized in that a positioning groove is formed on the fixed plate, and the positioning groove has a circumferential inner wall which is in a same shape as a circumferential outer edge of the encoder stator; and the encoder stator is fixed to the fixed plate so that the encoder stator is partially located within the positioning groove.
8. The servo motor according to claim 1, characterized in that the gasket is fixed to the rotor shaft so that a gap is formed between the gasket and the axial end face of the rotor shaft.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711273546.4A CN107834779A (en) | 2017-12-06 | 2017-12-06 | Servomotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ740769A true NZ740769A (en) | 2018-10-26 |
Family
ID=61641909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ740769A NZ740769A (en) | 2017-12-06 | 2018-03-15 | Servo motor |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN107834779A (en) |
| DE (1) | DE102018107649A1 (en) |
| NZ (1) | NZ740769A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112757280A (en) * | 2020-12-28 | 2021-05-07 | 深圳市优必选科技股份有限公司 | Steering wheel module and robot |
| CN114499099B (en) * | 2022-01-19 | 2024-04-26 | 北京大豪工缝智控科技有限公司 | Stepping motor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6042302B2 (en) * | 2012-12-07 | 2016-12-14 | 日本電産テクノモータ株式会社 | motor |
| CN207442651U (en) * | 2017-12-06 | 2018-06-01 | 浙江联宜电机有限公司 | Servomotor |
-
2017
- 2017-12-06 CN CN201711273546.4A patent/CN107834779A/en active Pending
-
2018
- 2018-03-15 NZ NZ740769A patent/NZ740769A/en unknown
- 2018-03-29 DE DE102018107649.5A patent/DE102018107649A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN107834779A (en) | 2018-03-23 |
| DE102018107649A1 (en) | 2019-06-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PSEA | Patent sealed | ||
| RENW | Renewal (renewal fees accepted) |
Free format text: PATENT RENEWED FOR 1 YEAR UNTIL 15 MAR 2023 BY ACUMASS Effective date: 20220218 |
|
| RENW | Renewal (renewal fees accepted) |
Free format text: PATENT RENEWED FOR 1 YEAR UNTIL 15 MAR 2024 BY ACUMASS Effective date: 20230221 |
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| RENW | Renewal (renewal fees accepted) |
Free format text: PATENT RENEWED FOR 1 YEAR UNTIL 15 MAR 2025 BY ACUMASS Effective date: 20240223 |