CN207819668U - A kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives - Google Patents
A kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives Download PDFInfo
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- CN207819668U CN207819668U CN201820170533.8U CN201820170533U CN207819668U CN 207819668 U CN207819668 U CN 207819668U CN 201820170533 U CN201820170533 U CN 201820170533U CN 207819668 U CN207819668 U CN 207819668U
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- rotary shaft
- permanent magnet
- synchronous motor
- shield machine
- magnet synchronous
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Abstract
The utility model discloses a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, and the cutter head of shield machine mechanism includes cutterhead, rotary shaft and bearing, it is characterised in that：The cutterhead is fixedly installed in described rotary shaft one end；The rotary shaft is fixedly installed in by bearing in shield machine front end body pedestal；The rotary shaft is directly driven by no frame permanent magnet synchronous motor.The utility model provides a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, and the cutter-head mechanism transmission efficiency, low noise, torque are big.
Description
Technical field
The utility model, which belongs to, is related to shield machine apparatus field more particularly to a kind of straight using no frame permanent magnet synchronous motor
Drive cutter head of shield machine mechanism.
Background technology
Shield machine is the important construction machinery in shield-tunneling construction, and since shield-tunneling construction has, safe and reliable, environment influence is small
The advantages that labor intensity is low, earth volume is few, efficient, in city rail, water conservancy, municipal works, mine, highway, railway tunnel
It is used widely in equal fields.Because shield machine is often constructed under complicated, severe working environment, so its transmission system wants energy
It is enough subjected to heavy load and large impact, and requires have the functions such as high-power, low-speed big output.
Wherein, the drive system of cutterhead is the core component of shield machine, main at present to add driver using driving power source
The combination of structure.The transmission mechanism belongs to intermediate equipment, reduction box, belt pulley etc., increases and rubs in work
Pair is wiped, transmission efficiency is low, noise is big.
Power source is driven mainly to use the type of drive or variable-frequency electric of double-speed motor main driving and hydraulic motor Assisted Combinatorial
Machine type of drive, the main driving of the double-speed motor and the type of drive of hydraulic motor Assisted Combinatorial have disadvantage：1, cannot
Continuous speed adjustment；2, geological adaptability is poor；3, high failure rate influences driving speed；4, hydraulic motor and motor cannot drive simultaneously
Problem.Although the variable-frequency motor type of drive can export larger torque in low speed, limited by maximum electromagnetic torque
System, torque of getting rid of poverty are limited.Actually can only increase power of motor to improve torque of getting rid of poverty, and necessarily variable-frequency motor be caused to be installed
Power dramatically increases.However the opposite torque of getting rid of poverty of Motor torque is very small so as to cause motor installation work(in the case where high speed tunnels operating mode
Rate wastes.
Utility model content
The purpose of this utility model is in view of the problems of the existing technology, it is straight to provide a kind of no frame permanent magnet synchronous motor
The cutter head of shield machine mechanism of drive, the cutter-head mechanism transmission efficiency, low noise, torque are big.
To achieve the above object, the technical solution adopted in the utility model is：
A kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, the cutter head of shield machine mechanism includes knife
Disk, rotary shaft and bearing, the cutterhead are fixedly installed in described rotary shaft one end；The rotary shaft is fixedly installed in by bearing
In shield machine front end body pedestal；The rotary shaft is directly driven by no frame permanent magnet synchronous motor, and the no frame permanent magnetism is same
It includes stator module and rotor assembly to walk motor；The stator module is fixedly installed on the body base, is the rotor
Component provides rotating excitation field；The rotor assembly with magnetic property is fixedly installed in the rotary shaft；
Wherein, the stator module includes stator core and the stator winding that is wrapped in the stator core, described
Stator core is in be integrally machined molding circular cylindrical structure or ring discoid structure.
Preferably, column structure, tail end are equipped with sealing plate to the rotary shaft in a ring；It is intended that the circular cylindrical
The design of structure both saves material utilization amount, alleviates the weight of the rotary shaft, and it is to overcome itself rotor weight to reduce motor
The electric energy measured and additionally consumed, while the contact area of the rotor pedestal and outside air is also increased, increase heat dissipation effect
Fruit ensures the stability of equipment operation.
Preferably, the rotor assembly is magnet steel substrate, and the magnet steel substrate is distributed in institute around the rotary shaft axial line
It states in rotary shaft；It is intended that needing processing gear to compare with original rotary shaft, magnetic base steel plate is directly installed on rotation
On axis, rotary shaft manufacture difficulty is greatly reduced；The rotor assembly combines together with rotary shaft, reduces the component group of motor
At being that electric machine structure is simpler, and cost-effective；The rotary shaft can provide an installation form for magnet steel substrate,
When assembling, the rotary shaft can assemble completion in advance with magnet steel substrate, enter the installation procedure of next step as a whole,
It is easy for installation, improve installation effectiveness.
It is further preferred that the rotary shaft is equipped with ventilation hole, head end is equipped with the first Air Filter；It is intended that increasing
Add the circulation of air, improves radiating efficiency；The Air Filter can ensure introduced contaminants not while increasing air circulation
Into inside motor, motor performance is influenced.
It is further preferred that being equipped with radiator fan in the rotary shaft, the radiator fan includes being socketed in be set to successively
The planetary gear disk of blast fan and driving the blast fan rotation in the sealing plate central fixed shaft；The planetary gear
Disk is equipped with gravity rod；It is intended that not needing extraneous additional power, radiating certainly for equipment is realized, rotated in rotary shaft
When, due to the effect of gravity rod, the planetary gear disk can be rotated around fixing axle, to which driving is connected with the planetary gear disk
The blast fan rotation connect generates wind-force；On the other hand, rotating speed is very low at work for the rotary shaft, the planetary gear
Disk can have a rotating ratio with blast fan, can amplify the rotating speed of blast fan, thus increasing heat radiation effect.
It is further preferred that the magnet steel substrate is distributed in tail end side wall and/or the end face of the rotary shaft；Its purpose exists
In convenient dismounting, replacement to motor.
Preferably, the stator module further includes having stator base；The stator base is fixedly installed in the ontology base
On seat；The stator core is fixedly installed in the stator base；It is intended that the stator base can be stator iron
The heart provides an installation form, and in assembling, the stator base can assemble completion in advance with stator core, whole as one
Body enters the installation procedure of next step, easy for installation, improves installation effectiveness, is omitted prevented also from scattered component, solves zero
The problem of part various bad management.
It is further preferred that capping structure, open end outer rim are equipped with installation step to the stator base in a ring, tail portion is opened
There is air hole；The second Air Filter is equipped in the air hole；The stator core is placed in side wall and/or the end face of the block；
It is intended that the stator base of capping structure provides the diversity of installation site for the stator core in a ring,
The stator core can be that circular cylindrical structure is fixed on side wall, or ring discoid structure is fixed on end face, corresponding
The magnet steel substrate.
Preferably, the stator base is equipped with heat emission hole, and Heat Conduction Material is filled in the heat emission hole；Its purpose exists
In so that the stator base also has more good heat conductivility while ensureing itself good structural rigidity, can
The amount of heat that stator winding electrifying generates is distributed, ensures the stable operation of motor, improves the service life of equipment.
Preferably, the no frame permanent magnet synchronous motor includes encoder, the encoder include code-disc and with it is described
The magnetic strength element of code-disc flexible connection, the code-disc and magnetic strength element are separately fixedly installed in the gear shaft and described fixed
On sub-component；It is intended that providing servo-control system for the rimless combination type permanent-magnet synchronous motor, motor closed loop is realized
Vector controlled, realization rotor speed and position are precisely controlled.
Compared with prior art, the utility model has the beneficial effects that：1, using no frame permanent magnet synchronous motor as rotation
The driving motor of shaft, directly with rotation axis connection, motor stator is looped around around rotor rotor, is fixed on motor peace
It fills on seat, drives intermediate link to reduce gear, reduction box etc., simplify the type of drive of equipment and the structure type of equipment,
Drive efficiency is improved, the loss of the energy is reduced；2, the mode directly driven substantially reduces the volume of equipment, alleviates weight of equipment；
3, the drive form that permanent magnet synchronous motor directly drives has fast response time, the high advantage of control accuracy；4, the heat dissipation rationally designed
Structure makes motor realize from heat dissipation.
Description of the drawings
Fig. 1 is a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives described in the utility model embodiment one
Structural schematic diagram；
Fig. 2 is the rotation axis structure diagram of the utility model embodiment one；
Fig. 3 is the structural schematic diagram of the utility model magnet steel substrate one；
Fig. 4 is the structural schematic diagram of the utility model stator core one；
Fig. 5 is a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives described in the utility model embodiment two
Overlooking structure diagram；
Fig. 6 is two rotation axis structure diagram of the utility model embodiment；
Fig. 7 is the structural schematic diagram of the utility model magnet steel substrate two；
Fig. 8 is the structural schematic diagram of the utility model stator core two；
Fig. 9 is a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives described in the utility model embodiment three
Structural schematic diagram；
In figure：1, cutterhead；2, rotary shaft；21, ventilation hole；3, bearing；4, stator module；41, stator base；42, stator
Iron core one；43, stator core two；44, heat emission hole；5, rotor assembly；51, magnet steel substrate one；52, magnet steel substrate two；6, ontology
Pedestal；7, the second Air Filter；8, the first Air Filter；9, fixing axle；10, blast fan；11, planetary gear disk；11-1, gravity
Bar；12, code-disc；13, magnetic strength element.
Specific implementation mode
Below in conjunction with the attached drawing in the utility model, the technical solution of the utility model is clearly and completely retouched
It states, it is clear that the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.Based on this
Embodiment in utility model, those of ordinary skill in the art obtained under the conditions of not making creative work it is all its
Its embodiment, shall fall within the protection scope of the present invention.
Embodiment one
As shown in Figs 1-4, a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, the cutter head of shield machine
Mechanism includes cutterhead 1, rotary shaft 2 and bearing 3, and the cutterhead 1 is fixedly installed in 2 one end of the rotary shaft；The rotary shaft 2
It is fixedly installed in shield machine front end body pedestal 6 by bearing 3；The rotary shaft 2 is direct by no frame permanent magnet synchronous motor
Driving, the no frame permanent magnet synchronous motor includes stator module 4 and rotor assembly 5；The stator module 4 is fixedly installed in institute
It states on body base 6, rotating excitation field is provided for the rotor assembly 5；The rotor assembly 5 with magnetic property is fixedly mounted
In in the rotary shaft 2；
Wherein, the stator module 4 includes stator core 1 and the stator that is wrapped in the stator core 1
Winding, the stator core 1 are in be integrally machined molding circular cylindrical structure.
As the preferred of the present embodiment, the column structure in a ring of the rotary shaft 2, tail end is equipped with sealing plate, and head end is equipped with the
One Air Filter 8；The rotor assembly 5 is magnet steel substrate 1；The magnet steel substrate 1 is in fan-shaped arc structure, around the rotation
2 axial line of shaft is distributed on 2 tail end side wall of the rotary shaft；Further, the rotary shaft 2 is equipped with ventilation hole 21, institute
Ventilation hole 21 is stated between two pieces of adjacent magnet steel substrates 1；Radiator fan is equipped in the rotary shaft 2, it is described to dissipate
Hot-air fan includes the blast fan 10 being socketed in successively in the sealing plate central fixed shaft 9 and the driving blast fan 10
The planetary gear disk 11 of rotation；The planetary gear disk is equipped with gravity rod 11-1；The stator module 4 further includes having stator base
Seat 41；The stator base 41 is fixedly installed on the body base 6；The stator core 1 is fixedly installed in described fixed
In sub-base 41；Further, capping structure, open end outer rim are equipped with installation step, tail portion to the stator base 41 in a ring
It is provided with air hole；The second Air Filter 7 is equipped in the air hole；The stator core 1 is placed on the inside of the stator base
Wall, it is corresponding with the magnet steel substrate 1；Further, the stator base 41 is equipped with heat emission hole 44, the heat emission hole 44
In be filled with graphite；Further, the no frame permanent magnet synchronous motor includes encoder, and the encoder includes code-disc 12
And the magnetic strength element 13 being flexibly connected with the code-disc 12, the code-disc 12 and magnetic strength element 13 are separately fixedly installed in the rotation
In shaft 2 and the stator base 41
After energization, the stator core 1 is that the magnet steel substrate 1 provides the magnetic field radially rotated,
It is that the rotary shaft 2 provides the torque rotated around the rotary shaft axial line to promote the stator module 4 and rotor assembly 5, directly
Connect the driving cutterhead rotary work.
Embodiment two
As viewed in figures 5-8, a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, the cutter head of shield machine
Mechanism includes cutterhead 1, rotary shaft 2 and bearing 3, and the cutterhead 1 is fixedly installed in 2 one end of the rotary shaft；The rotary shaft 2
It is fixedly installed in shield machine front end body pedestal 6 by bearing 3；The rotary shaft 2 is direct by no frame permanent magnet synchronous motor
Driving, the no frame permanent magnet synchronous motor includes stator module 4 and rotor assembly 5；The stator module 4 is fixedly installed in institute
It states on body base 6, rotating excitation field is provided for the rotor assembly 5；The rotor assembly 5 with magnetic property is fixedly mounted
In in the rotary shaft 2；
Wherein, the stator module 4 includes stator core 2 43 and the stator that is wrapped in the stator core 2 43
Winding, the stator core 2 43 are in be integrally machined molding ring discoid structure.
As the preferred of the present embodiment, the column structure in a ring of the rotary shaft 2, tail end is equipped with sealing plate, and head end is equipped with the
One Air Filter 8；The rotor assembly 5 is magnet steel substrate 2 52；The magnet steel substrate 2 52 is in fan-shaped disk-like structure, around the rotation
2 axial line of shaft is distributed on 2 tail end end face of the rotary shaft；Further, the rotary shaft 2 is equipped with ventilation hole 21, institute
Ventilation hole 21 is stated between two pieces of adjacent magnet steel substrates 2 52；Radiator fan is equipped in the rotary shaft 2, it is described to dissipate
Hot-air fan includes the blast fan 10 being socketed in successively in the sealing plate central fixed shaft 9 and the driving blast fan 10
The planetary gear disk 11 of rotation；The planetary gear disk is equipped with gravity rod 11-1；The stator module 4 further includes having stator base
Seat 41；The stator base 41 is fixedly installed on the body base 6；The stator core 2 43 is fixedly installed in described fixed
In sub-base 41；Further, capping structure, open end outer rim are equipped with installation step, tail portion to the stator base 41 in a ring
It is provided with air hole；The second Air Filter 7 is equipped in the air hole；The stator core 2 43 is placed in the stator base inner end
Face, it is corresponding with the magnet steel substrate 2 52；Further, the stator base 41 is equipped with heat emission hole 44, the heat emission hole 44
In be filled with graphite；Further, the no frame permanent magnet synchronous motor includes encoder, and the encoder includes code-disc 12
And the magnetic strength element 13 being flexibly connected with the code-disc 12, the code-disc 12 and magnetic strength element 13 are separately fixedly installed in the rotation
In shaft 2 and the stator base 41
After energization, the stator core 2 43 is that the magnet steel substrate 2 52 provides the magnetic field that an axis rotates up,
It is that the rotary shaft 2 provides the torque rotated around the rotary shaft axial line to promote the stator module 4 and rotor assembly 5, directly
Connect the driving cutterhead rotary work.
Embodiment three
As described in Figure 9, a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, the cutter head of shield machine machine
Structure includes cutterhead 1, rotary shaft 2 and bearing 3, and the cutterhead 1 is fixedly installed in 2 one end of the rotary shaft；The rotary shaft 2 is logical
Bearing 3 is crossed to be fixedly installed in shield machine front end body pedestal 6；The rotary shaft 2 is directly driven by no frame permanent magnet synchronous motor
Dynamic, the no frame permanent magnet synchronous motor includes stator module 4 and rotor assembly 5；The stator module 4 is fixedly installed in described
On body base 6, rotating excitation field is provided for the rotor assembly 5；The rotor assembly 5 with magnetic property is fixedly installed in
In the rotary shaft 2；
Wherein, the stator module 4 includes stator core 1 and stator core 2 43, the stator core 1 and
Stator core 2 43 is respectively wound with stator winding, and the stator core 1 is in be integrally machined molding circular cylindrical structure,
The stator core 2 43 is in be integrally machined molding ring discoid structure.
As the preferred of the present embodiment, the column structure in a ring of the rotary shaft 2, tail end is equipped with sealing plate, and head end is equipped with the
One Air Filter 8；The rotor assembly 5 includes magnet steel substrate 1 and magnet steel substrate 2 52；The magnet steel substrate 1 is in fan
Shape arc structure is distributed in around 2 axial line of the rotary shaft on 2 tail end side wall of the rotary shaft；The magnet steel substrate 2 52 is in
Fan-shaped disk-like structure is distributed in around 2 axial line of the rotary shaft on 2 tail end end face of the rotary shaft；Further, the rotation
Axis 2 is upper between two pieces of adjacent magnet steel substrates 1 and between adjacent two pieces of magnet steel substrates 2 52 to be equipped with ventilation
Hole 21；Radiator fan is equipped in the rotary shaft 2, the radiator fan includes being socketed in fix set on the sealing plate center successively
The planetary gear disk 11 that blast fan 10 and the driving blast fan 10 on axis 9 rotate；The planetary gear disk is equipped with
Gravity rod 11-1；The stator module 4 further includes having stator base 41；The stator base 41 is fixedly installed in the ontology base
On seat 6；The stator core 1 and stator core 2 43 are fixedly installed in the stator base 41；Further, described
Capping structure, open end outer rim are equipped with installation step to stator base 41 in a ring, and tail portion is provided with air hole；It is set in the air hole
There is the second Air Filter 7；The stator core 1 is placed in the stator base madial wall, corresponding with the magnet steel substrate 1；
The stator core 2 43 is placed in the stator base inner face, corresponding with the magnet steel substrate 2 52；Further, described fixed
Sub-base 41 is equipped with heat emission hole 44, and graphite is filled in the heat emission hole 44；Further, the no frame permanent magnet synchronous electric
Machine includes encoder, and the encoder includes code-disc 12 and the magnetic strength element 13 being flexibly connected with the code-disc 12, the code
Disk 12 and magnetic strength element 13 are separately fixedly installed in the rotary shaft 2 and the stator base 41
After energization, the stator core 1 is that the magnet steel substrate 1 provides the magnetic field radially rotated,
The stator core 2 43 provides the magnetic field that an axis rotates up for the magnet steel substrate 2 52 and promotes the stator module 4
And rotor assembly 5 is that the rotary shaft 2 provides the torque rotated around the rotary shaft axial line, directly drives the cutterhead rotation
Work.
It should be pointed out that the stator base 41 can be an integral molding structure, the form of combination can also be used.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is appreciated that can these embodiments be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (10)
1. a kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives, the cutter head of shield machine mechanism includes knife
Disk, rotary shaft and bearing, it is characterised in that：The cutterhead is fixedly installed in described rotary shaft one end；The rotary shaft passes through axis
It holds and is fixedly installed in shield machine front end body pedestal；The rotary shaft is directly driven by no frame permanent magnet synchronous motor；It is described
No frame permanent magnet synchronous motor includes stator module and rotor assembly；The stator module is fixedly installed in the body base
On, provide rotating excitation field for the rotor assembly；The rotor assembly with magnetic property is fixedly installed in the rotary shaft
On；
Wherein, the stator module includes stator core and the stator winding that is wrapped in the stator core, the stator
Iron core is in be integrally machined molding circular cylindrical structure or ring discoid structure.
2. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 1 directly drives, feature exist
In column structure, tail end are equipped with sealing plate to the rotary shaft in a ring.
3. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 1 directly drives, feature exist
In the rotor assembly is magnet steel substrate, and the magnet steel substrate is distributed in around the rotary shaft axial line in the rotary shaft.
4. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 2 directly drives, feature exist
In the rotary shaft is equipped with ventilation hole, and head end is equipped with the first Air Filter.
5. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 2 directly drives, feature exist
In equipped with radiator fan in the rotary shaft, the radiator fan includes being socketed in successively set on the sealing plate central fixed shaft
On blast fan and driving blast fan rotation planetary gear disk；The planetary gear disk is equipped with gravity rod.
6. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 3 directly drives, feature exist
In the magnet steel substrate is distributed in tail end side wall and/or the end face of the rotary shaft.
7. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 1 directly drives, feature exist
In the stator module further includes having stator base；The stator base is fixedly installed on the body base；The stator
Iron core is fixedly installed in the stator base.
8. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 7 directly drives, feature exist
In capping structure, open end outer rim are equipped with installation step to the stator base in a ring, and tail portion is provided with air hole；It is described ventilative
The second Air Filter is equipped in hole；The stator core is placed in side wall and/or the end face of the block.
9. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 7 directly drives, feature exist
In the stator base is equipped with heat emission hole, and Heat Conduction Material is filled in the heat emission hole.
10. the cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor according to claim 1 directly drives, feature exist
In the no frame permanent magnet synchronous motor includes encoder, and the encoder includes code-disc and is flexibly connected with the code-disc
Magnetic strength element, the code-disc and magnetic strength element are separately fixedly installed on the rotary shaft and the stator module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820170533.8U CN207819668U (en) | 2018-01-31 | 2018-01-31 | A kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820170533.8U CN207819668U (en) | 2018-01-31 | 2018-01-31 | A kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives |
Publications (1)
| Publication Number | Publication Date |
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| CN207819668U true CN207819668U (en) | 2018-09-04 |
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ID=63322489
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820170533.8U Active CN207819668U (en) | 2018-01-31 | 2018-01-31 | A kind of cutter head of shield machine mechanism that no frame permanent magnet synchronous motor directly drives |
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| CN (1) | CN207819668U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233617A (en) * | 2018-01-31 | 2018-06-29 | 湖北环电磁装备工程技术有限公司 | The cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor directly drives |
-
2018
- 2018-01-31 CN CN201820170533.8U patent/CN207819668U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233617A (en) * | 2018-01-31 | 2018-06-29 | 湖北环电磁装备工程技术有限公司 | The cutter head of shield machine mechanism that a kind of no frame permanent magnet synchronous motor directly drives |
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