CN210080038U - Energy-saving electromagnetic vibration type conveying screening machine - Google Patents

Abstract

The utility model relates to an energy-saving electromagnetic vibration formula conveying screening machine solves traditional rocking arm formula vibratory conveying screening machine transmission inefficiency, the big, the energy consumption of wearing and tearing is high, the high problem of maintenance cost. The screening machine comprises a screen body, a balancing body, a rack, a linear electromagnetic driving head, a linear bearing rocker arm assembly and a spring vibration unit; the linear electromagnetic driving head is arranged on the frame, and the power output end is connected with the balance body; the linear bearing rocker arm assembly comprises a plurality of groups of rocker arms, one end of each rocker arm is hinged with the screen body, the other end of each rocker arm is hinged with the balance body, and the middle part of each rocker arm is hinged with the rack; the fixed frame in the spring vibration unit is fixedly connected with the frame, the left spring pressing plate and the right spring pressing plate are respectively arranged on two sides of the fixed frame, the balance body bearing plate is arranged between the left spring pressing plate and the right spring pressing plate and is fixedly connected with the balance body, the left compression spring group is compressed between the left spring pressing plate and the balance body bearing plate, and the right compression spring group is compressed between the right spring pressing plate and the balance body bearing plate.

Description

Energy-saving electromagnetic vibration type conveying screening machine

Technical Field

The utility model relates to a screening equipment is carried to the material, concretely relates to energy-saving electromagnetic vibration formula conveying and screening machine.

Background

At present, a material conveying and screening machine used in a tobacco industry production line is a rocker arm type vibration conveying and screening machine, a driving system of the rocker arm type vibration conveying and screening machine is composed of a rotary asynchronous motor and an eccentric connecting rod mechanism, namely, when equipment works, the rotary asynchronous motor drives an eccentric shaft to rotate, the eccentric shaft is connected with a screen body and a balance body through two connecting rods and moves towards opposite directions respectively, forced driving of the vibration conveying and screening machine at a fixed rotating speed is realized, and therefore the conveying or screening requirements of materials are met. The traditional vibration conveying screening machine is designed to be a high-damping rubber column structure except that the driving mode is forced contact friction conversion, according to the design experience of the traditional vibration conveying screening machine, the rubber column with the Shore hardness of 75 degrees plays a role in supporting and rotating the shaft, but the energy feedback rate is lower, the damping function absorbs more than 70% of vibration energy, the feedback energy availability is lower, the internal friction force increases the driving resistance, and the required driving force is larger. Therefore, for the driving system of the traditional rocker arm type vibration conveying screening machine and the vibration mode of the rubber rocker arm damping structure, the rocker arm type vibration conveying screening machine has the defects of low transmission efficiency, large abrasion, high energy consumption, large noise, high maintenance cost and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems of low transmission efficiency, large abrasion, high energy consumption and high maintenance cost of the traditional rocker arm type vibration conveying screening machine and providing an energy-saving electromagnetic vibration type conveying screening machine.

In order to realize the purpose, the technical scheme of the utility model is that:

the utility model provides an energy-saving electromagnetic vibration formula conveying screening machine, includes screen frame, balancing body and frame, screen frame, balancing body all set up in the frame, its special character lies in: the linear bearing rocker arm assembly is arranged on the linear electromagnetic driving head; the linear electromagnetic driving head is arranged on the rack, and the power output end of the linear electromagnetic driving head is connected with the balance body and used for providing a power source required by vibration; the linear bearing rocker arm assembly comprises a plurality of groups of rocker arms, one end of each rocker arm is hinged with the screen body, the other end of each rocker arm is hinged with the balance body, and the middle part of each rocker arm is hinged with the rack; the spring vibration unit comprises a fixed frame, a balance body bearing plate, a left spring pressing plate, a right spring pressing plate, a left compression spring group and a right compression spring group, wherein the left compression spring group and the right compression spring group respectively comprise a plurality of groups of springs; the fixed frame is fixedly connected with the frame, the left spring pressing plate and the right spring pressing plate are respectively arranged on two sides of the fixed frame, the balance body bearing plate is arranged between the left spring pressing plate and the right spring pressing plate and is fixedly connected with the balance body, the left compression spring group is compressed between the left spring pressing plate and the balance body bearing plate, and the right compression spring group is compressed between the right spring pressing plate and the balance body bearing plate.

Further, the spring vibration unit further comprises a left side plate, a right side plate, a left adjusting bolt and a right adjusting bolt, the left side plate and the right side plate are fixedly arranged on the fixed frame, the left side plate is located on the outer side of the left spring pressing plate and parallel to the left spring pressing plate, the right side plate is located on the outer side of the right spring pressing plate and parallel to the right spring pressing plate, the left adjusting bolt penetrates through the left side plate and is in threaded connection with the left spring pressing plate, and the right adjusting bolt penetrates through the right side plate and is in threaded connection with the right spring pressing plate.

Further, the spring vibration unit still includes left limiting plate, right limiting plate, left side limiting plate is fixed to be set up on the left side board for carry on spacingly to left spring clamp plate in the motion of perpendicular to spring compression direction, there is right position board fixed to be set up on the right side board for carry on spacingly to the motion of right spring clamp plate in the perpendicular to spring compression direction.

Further, left side compression spring group and right compression spring group all include multiunit outer spring and inner spring, the internal diameter of outer spring is greater than the external diameter of inner spring, the inner spring sets up inside the outer spring.

Furthermore, a plurality of groups of spring mounting sleeves are arranged on the left side plate, the right side plate and the balance body bearing plate, and two ends of the outer spring and the two ends of the inner spring are respectively arranged in the spring mounting sleeves.

Further, the left compression spring set and the right compression spring set respectively comprise seven groups of outer springs and inner springs, and the pitches of the outer springs and the pitches of the inner springs are the same.

Further, the linear bearing rocker arm assembly further comprises a first rotating shaft, a second rotating shaft, a third rotating shaft and a bearing; one end of the first rotating shaft is arranged at one end of the rocker through a bearing, the other end of the first rotating shaft is arranged on the screen body, one end of the second rotating shaft is arranged at the other end of the rocker through a bearing, the other end of the second rotating shaft is arranged on the balancing body, one end of the third rotating shaft is arranged in the middle of the rocker through a bearing, and the other end of the third rotating shaft is arranged on the rack.

Further, the bearing is a sliding bearing or a rolling bearing.

Furthermore, the linear electromagnetic driving head comprises a fixed side plate, a swinging rocker arm, a rotor connecting plate, a rotor and two groups of stator coils; the rotor is arranged between the two groups of stator coils, magnetic force generated by the stator coils alternately attracts the rotor to swing left and right, the rotor is fixedly connected with a rotor connecting plate, and the rotor connecting plate is connected with the balance body and used for transmitting the swing of the rotor to the balance body; the stator coil is fixedly connected with the fixed side plate, the fixed side plate is fixedly arranged on the rack, one end of the swing rocker arm is hinged with the fixed side plate, and the other end of the swing rocker arm is hinged with the rotor connecting plate.

Further, a displacement sensor is arranged on the mover.

The utility model has the advantages that:

1. the utility model discloses energy-saving electromagnetic vibration formula conveying screening machine adopts the output mode (active cell and stator do not have the friction, for electromagnetic type attraction mode produces power) of the approximate linear motion of electromagnetic drive and frictionless floated active cell, has cancelled middle shifter, has improved energy utilization, has reduced the noise source.

2. The utility model discloses energy-saving electromagnetic vibration formula conveying screening machine utilizes bearing self-lubricating rocking arm pendulum rod design, has reduced the swing in-process and has produced the damping and to the absorption of energy, makes inertial energy effectively transmit spring system and realizes the energy storage purpose, and better provides the feedback energy to the operation of balance body.

Drawings

FIG. 1 is a schematic view of the energy-saving electromagnetic vibration conveying screen machine of the present invention;

figure 2 is a schematic view of a linear electromagnetic driving head structure in the sieving machine of the present invention;

figure 3 is a schematic structural view of a linear bearing rocker arm assembly in the sieving machine of the utility model;

figure 4 is a schematic view of the installation of the spring vibration unit in the sieving machine of the present invention;

fig. 5 is the utility model discloses spring vibration unit structure sketch map in the extension.

Reference numerals: 1-a frame, 2-a screen body, 3-a balance body, 4-a linear electromagnetic driving head, 5-a linear bearing rocker arm component, 6-a spring vibration unit, 7-a driving head mounting rack, 41-a fixed side plate, 42-a swinging rocker arm, 43-a rotor connecting plate, 44-a rotor, 45-a stator coil, 51-a rocker arm, 52-a first rotating shaft, 53-a second rotating shaft, 54-a third rotating shaft, 55-a bearing, 61-a fixed frame, 62-a balance body bearing plate, 63-a left spring pressing plate, 64-a right spring pressing plate, 65-a left compression spring group, 66-a right compression spring group, 67-a left side plate, 68-a right side plate, 69-a left adjusting bolt, 610-a right adjusting bolt, 611-a left limiting plate, 612-right limit plate, 613-spring mounting sleeve.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

the utility model relates to a material transport screening equipment that tobacco processing enterprise used, especially an energy saving and consumption reduction has higher requirement's standby equipment, for reducing rocking arm formula vibratory conveying screening machine, its energy consumption is low, equipment operation noise angle, and the maintenance cost is lower.

The utility model discloses mainly adopt sharp electromagnetic drive head to be the power supply, the rotating-structure of rocking arm changes sliding bearing structure into by damping rubber, increase the spring vibration unit of energy storage, the new structure form combination of triplex main part component has formed energy-saving rocking arm formula electromagnetic vibration transport screening machine resonance system design, the energy consumption utilization ratio who utilizes sharp electromagnetic drive head not to have transmission friction and no middle energy conversion equipment messenger equipment effectively improves, linear bearing's rocker structure has effectively reduced the big damping energy consumption that the rubber rocking arm produced, the inertia storage that the increase of spring vibration unit impeld equipment make full use of sport type to produce and utilizes self energy.

As shown in fig. 1, the energy-saving electromagnetic vibration type conveying screening machine comprises a frame 1, and a screen body 2, a balancing body 3, a linear electromagnetic driving head 4, a linear bearing rocker arm assembly 5 and a spring vibration unit 6 which are arranged on the frame 1. The main difference from the traditional rocker arm type vibration conveying screening machine is that the structure composition of the linear electromagnetic driving head 4, the linear bearing 55 rocker arm and the spring vibration unit 6 is different.

As shown in fig. 2, the linear electromagnetic driving head 4 is arranged on the frame 1, and the power output end thereof is connected with the balance body 3 for providing a power source required by vibration; the linear electromagnetic driving head 4 comprises a fixed side plate 41, a swing rocker arm 42, a rotor connecting plate 43, a rotor 44 and two groups of stator coils 45; the rotor 44 is arranged between the two groups of stator coils 45, magnetic force generated by the stator coils 45 alternately attracts the rotor 44 to swing left and right, the rotor 44 is fixedly connected with the rotor connecting plate 43, the rotor connecting plate 43 is connected with the balance body 3, and the swing of the rotor 44 is transmitted to the balance body 3 through the arrangement, so that the balance body 3 swings, the groove (sieve) body swings according to a fixed frequency, and the material conveying and sieving functions are realized. Stator coil 45 and fixed curb plate 41 fixed connection, fixed curb plate 41 passes through drive head mounting bracket 7 and fixes the setting on frame 1, and the one end of swing rocking arm 42 is articulated with fixed curb plate 41, and the other end is articulated with active cell connecting plate 43, makes active cell 44 suspend in the middle of two sets of stator coils 45, guarantees the required clearance of rotatory swing.

The linear electromagnetic driving head 4 is mainly used for providing a power source required by vibration for equipment, the stator coil 45 alternately generates magnetic force to attract the rotor 44 to swing left and right, the rotor 44 drives the balance body 3, and the screen (groove) body is driven under the associated action of the rocker arm of the linear bearing 55 and the auxiliary energy supplement of the spring vibration unit 6 to realize a designed action mode, so that the material is conveyed or screened. The linear electromagnetic driving head 4 is mainly characterized in that the output force direction of the mover 44 is a linear and approximately linear motion mode, and the structural features thereof are not limited, and this example is only one of the structural features of the linear electromagnetic driving head.

As shown in fig. 3, the linear bearing rocker arm assembly 5 includes a plurality of sets of a rocker 51, a first rotating shaft 52, a second rotating shaft 53, a third rotating shaft 54 and a bearing 55, one end of the rocker 51 is hinged to the screen body 2, the other end is hinged to the balancing body 3, and the middle portion is hinged to the frame 1. The specific connection relationship of the rocker 51 is: one end of the first rotating shaft 52 is disposed at one end of the rocking bar 51 through a bearing 55, the other end is disposed on the screen body 2, one end of the second rotating shaft 53 is disposed at the other end of the rocking bar 51 through a bearing 55, the other end is disposed on the balance body 3, one end of the third rotating shaft 54 is disposed at the middle of the rocking bar 51 through a bearing 55, the other end is disposed on the frame 1, and the bearing 55 may be a sliding bearing 55 or a rolling bearing 55.

The linear bearing 55 rocker arm is mainly characterized in that the contact friction is sliding friction, the resistance is relatively small, the structural design of a self-lubricating sliding bearing, a rolling bearing 55 or a bearing with a seat 55 is adopted, the mutual rotation process does not generate large resistance and damping, and a rubber column form is not adopted to avoid excessive energy loss or absorption.

As shown in fig. 4 and 5, the spring vibration unit 6 includes a fixed frame 61, a balance bearing plate 62, a left spring pressing plate 63, a right spring pressing plate 64, a left compression spring group 65, a right compression spring group 66, a left side plate 67, a right side plate 68, a left adjusting bolt 69, a right adjusting bolt 610, a left limit plate 611, a right limit plate 612, and a spring mounting sleeve 613; the left compression spring set 65 and the right compression spring set 66 each include a plurality of sets of springs; the fixed frame 61 is fixedly connected with the frame 1, the left spring pressing plate 63 and the right spring pressing plate 64 are respectively arranged on two sides of the fixed frame 61, the balance body bearing plate 62 is arranged between the left spring pressing plate 63 and the right spring pressing plate 64 and fixedly connected with the balance body 3, the left compression spring group 65 is compressed between the left spring pressing plate 63 and the balance body bearing plate 62, the right compression spring group 66 is compressed between the right spring pressing plate 64 and the balance body bearing plate 62, it is ensured that the stored energy for pressing the left compression spring group 65 and the right compression spring group 66 is transmitted to the balance body 3 through the balance body bearing plate 62, the fixed frequency swing of a groove (sieve) body is realized by being simultaneously driven by the linear electromagnetic driving head 4, and the vibration conveying or sieving process requirements of materials are realized.

Left side board 67, right side board 68 is fixed to be set up on fixed frame 61, left side board 67 is located the outside of left spring clamp plate 63, and is parallel with left spring clamp plate 63, right side board 68 is located the outside of right spring clamp plate 64, and is parallel with right spring clamp plate 64, left adjusting bolt 69 passes left side board 67 and left spring clamp plate 63 threaded connection, right adjusting bolt 610 passes right side board 68 and right spring clamp plate 64 threaded connection, realize left spring clamp plate 63, the position control of right spring clamp plate 64, make the energy of spring can fully feed back to balance body 3. The left limiting plate 611 is fixedly arranged on the left side plate 67 and used for limiting the movement of the left spring pressing plate 63 in the direction perpendicular to the spring compression direction, and the right limiting plate is fixedly arranged on the right side plate 68 and used for limiting the movement of the right spring pressing plate 64 in the direction perpendicular to the spring compression direction, so that the left spring pressing plate 63 and the right spring pressing plate 64 can only move in the direction along which the springs are compressed. The left compression spring set 65 and the right compression spring set 66 each include seven sets of outer springs and inner springs, the inner diameters of the outer springs are larger than the outer diameters of the inner springs, the inner springs are disposed inside the outer springs, and the pitches of the outer springs and the inner springs are the same. The left side plate 67, the right side plate 68 and the balance body bearing plate 62 are all provided with a plurality of groups of spring mounting sleeves 613, two ends of the outer spring and the inner spring are respectively arranged in the spring mounting sleeves 613, the number of the springs is directly related to the weight of the tank body, and the heavier the tank body is, the more the number of the springs is required.

The spring vibration unit 6 is mainly characterized by comprising two groups of springs and an adjusting screw rod, energy storage and release are provided for the inertia force generated by the balance body 3 in the operation process of the equipment so as to meet the energy-saving requirement of the energy consumption of the linear electromagnetic driving head 4, the spring vibration unit 6 is formed by respectively carrying out self push-pull reciprocating motion on the balance body 3 by the positive and negative groups of springs, the functions of energy absorption and release are realized, and meanwhile, the functions of amplitude keeping and vibration reduction are also realized.

The mover 44 is provided with a displacement sensor, and the amplitude of the displacement sensor (which is a component of an electromagnetic drive motor and used for controlling the operation stroke of the mover 44) is fixed by mounting the mover 44 on the linear electromagnetic drive head 4, and the stator coil 45 is switched to generate electricity to generate electromagnetic force to drive the mover 44 to move at a fixed frequency. The straight line electromagnetic driving head 4 and the spring vibration unit 6 are combined in a mixed mode to drive the balancing body 3 together, and the groove (sieve) body swings under the driving of the rocker. The design driving frequency of the linear electromagnetic driving head 4 is close to the natural frequency of the spring vibration unit 6 for equipment vibration, so that an energy-saving driving mode in a resonance state is formed, the stored energy of the spring vibration unit 6 is released and better applied by fully utilizing the inertia energy generated when the equipment vibrates, and the effective transmission of the energy is realized under the low resistance of the structural design of the linear rocker arm.

The utility model discloses utilize the energy-conserving principle of resonance, the natural frequency who produces through the output frequency that the electromagnetic drive head set for and equipment spring vibration unit 6 keeps being approximate one and causes its system to reach the resonance state. The linear electromagnetic driving head mainly comprises a stator and a rotor 44, the stator is fixed with the frame 1, the rotor 44 (the swing rocker 42 is fixed with the power connecting plate) floats in the middle of the stator, no friction parts such as bearings exist, the rotor 44 is fixedly connected with the balance body 3, the output form of the rotor is approximate linear motion, and the output form of the rotor is consistent with the motion form of the rocker of the equipment; the rocker arm consists of a linear self-lubricating bearing and a rocker, is arranged on two sides of the tank body and the balance body, has a supporting and stabilizing effect on the tank body and the balance body 3, and realizes undamped swinging according to a design mode.

The utility model provides a phenomenon that the big damping forced vibration of traditional rocking arm formula vibratory conveying screening machine caused is high, contact friction causes wearing and tearing to strengthen, the noise increases, improves from power system and rocker arm structure, adopts the electromagnetic drive mode to replace asynchronous motor and eccentric connecting rod's forced switching motion, adopts sharp self-lubricating bearing rocking arm to replace rubber damping rocking arm, increases spring assembly and improves power structure, has improved the repayment rate to the vibration energy, loss or consumption of reduction energy. Through the change and improvement of a driving mode, a rocker arm structure and a power feedback system, the electromagnetism and spring energy of the bearing spring type electromagnetic vibration conveying screening machine can be fully utilized, compared with the traditional structure, the energy consumption and the operation noise of equipment can be effectively reduced, the production field environment is improved, the effective operation rate of the equipment is improved, and the use and maintenance cost of enterprise equipment is very necessary.

Claims (10)

1. The utility model provides an energy-saving electromagnetic vibration formula conveying screening machine, includes screen frame (2), balance body (3) and frame (1), screen frame (2), balance body (3) all set up on frame (1), its characterized in that: the linear bearing vibration device also comprises a linear electromagnetic driving head (4), a linear bearing rocker arm component (5) and a spring vibration unit (6);

the linear electromagnetic driving head (4) is arranged on the rack (1), and the power output end of the linear electromagnetic driving head is connected with the balancing body (3) and used for providing a power source required by vibration;

the linear bearing rocker arm assembly (5) comprises a plurality of groups of rockers (51), one end of each rocker (51) is hinged with the screen body (2), the other end of each rocker (51) is hinged with the balance body (3), and the middle part of each rocker (51) is hinged with the rack (1);

the spring vibration unit (6) comprises a fixed frame (61), a balance body bearing plate (62), a left spring pressing plate (63), a right spring pressing plate (64), a left compression spring set (65) and a right compression spring set (66), wherein the left compression spring set (65) and the right compression spring set (66) respectively comprise a plurality of groups of springs; fixed frame (61) and frame (1) fixed connection, left spring clamp plate (63), right spring clamp plate (64) set up respectively in the both sides of fixed frame (61), balance body bearing plate (62) set up between left spring clamp plate (63), right spring clamp plate (64), and with balance body (3) fixed connection, left side compression spring group (65) are compressed between left spring clamp plate (63) and balance body bearing plate (62), right side compression spring group (66) are compressed between right spring clamp plate (64) and balance body bearing plate (62).

2. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 1, wherein: spring vibration unit (6) still includes left side board (67), right side board (68), left adjusting bolt (69) and right adjusting bolt (610), left side board (67), right side board (68) are fixed to be set up on fixed frame (61), left side board (67) are located the outside of left spring clamp plate (63), and are parallel with left spring clamp plate (63), right side board (68) are located the outside of right spring clamp plate (64), and are parallel with right spring clamp plate (64), left side adjusting bolt (69) pass left side board (67) and left spring clamp plate (63) threaded connection, right adjusting bolt (610) pass right side board (68) and right spring clamp plate (64) threaded connection.

3. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 2, wherein: the spring vibration unit (6) further comprises a left limiting plate (611) and a right limiting plate (612), the left limiting plate (611) is fixedly arranged on the left side plate (67) and used for limiting the movement of the left spring pressing plate (63) in the direction perpendicular to the spring compression direction, and the right limiting plate is fixedly arranged on the right side plate (68) and used for limiting the movement of the right spring pressing plate (64) in the direction perpendicular to the spring compression direction.

4. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 3, wherein: the left compression spring set (65) and the right compression spring set (66) both comprise a plurality of sets of outer springs and inner springs, the inner diameters of the outer springs are larger than the outer diameters of the inner springs, and the inner springs are arranged inside the outer springs.

5. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 4, wherein: the left side plate (67), the right side plate (68) and the balance body bearing plate (62) are all provided with a plurality of groups of spring mounting sleeves (613), and two ends of the outer spring and the inner spring are respectively arranged in the spring mounting sleeves (613).

6. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 5, wherein: the left compression spring set (65) and the right compression spring set (66) respectively comprise seven groups of outer springs and inner springs, and the pitches of the outer springs and the inner springs are the same.

7. The energy-saving electromagnetic vibration conveying and screening machine according to any one of claims 1 to 6, wherein: the linear bearing rocker arm assembly (5) further comprises a first rotating shaft (52), a second rotating shaft (53), a third rotating shaft (54) and a bearing (55); one end of the first rotating shaft (52) is arranged at one end of the rocker (51) through a bearing (55), the other end of the first rotating shaft is arranged on the screen body (2), one end of the second rotating shaft (53) is arranged at the other end of the rocker (51) through the bearing (55), the other end of the second rotating shaft is arranged on the balancing body (3), one end of the third rotating shaft (54) is arranged in the middle of the rocker (51) through the bearing (55), and the other end of the third rotating shaft is arranged on the rack (1).

8. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 7, wherein: the bearing (55) is a sliding bearing or a rolling bearing.

9. The energy-saving electromagnetic vibrating conveying and screening machine according to claim 8, wherein: the linear electromagnetic driving head (4) comprises a fixed side plate (41), a swing rocker arm (42), a rotor connecting plate (43), a rotor (44) and two groups of stator coils (45);

the rotor (44) is arranged between the two groups of stator coils (45), the rotor (44) is attracted to swing left and right through magnetic force generated by the stator coils (45) alternately, the rotor (44) is fixedly connected with a rotor connecting plate (43), and the rotor connecting plate (43) is connected with the balancing body (3) and used for transmitting the swing of the rotor (44) to the balancing body (3); the stator coil (45) is fixedly connected with a fixed side plate (41), the fixed side plate (41) is fixedly arranged on the rack (1), one end of the swing rocker arm (42) is hinged with the fixed side plate (41), and the other end of the swing rocker arm is hinged with the rotor connecting plate (43).

10. The energy-saving electromagnetic vibratory conveying screen machine according to claim 9, wherein: and a displacement sensor is arranged on the rotor (44).

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