CN105048714A - Integrated lead-screw electromechanical inertia container - Google Patents

Abstract

The invention provides an integrated lead screw electromechanical inerter, which includes a lead screw shaft, a nut rotor, a stator, an armature winding, a permanent magnet and an armature control circuit connected to the armature winding, and an Thrust bearing, the permanent magnet is arranged on the nut rotor, the armature winding is arranged on the stator, the nut rotor is threadedly matched with the screw shaft, the linear motion of the screw shaft drives the nut rotor to rotate, the The armature winding generates an induced electromotive force when the nut rotor rotates, and the induced electromotive force acts on the armature control circuit. The invention has the advantages of improved performance and stability of the inerter and compact structure.

Description

An integrated lead screw electromechanical inerter

technical field

The invention relates to an inerter, in particular to an integrated screw electromechanical inerter.

Background technique

Inerter is a mechanical inertia element with two terminals proposed in recent years. It is widely used in the field of vibration isolation technology, such as suspension, building anti-shock and absorbing dynamic mechanical vibration. In the electromechanical analogy theory, the inerter can be completely similar to the capacitor in the circuit network, so the theoretical method of circuit network synthesis can be used to guide the design of the mechanical network. In the mechanical network synthesis, the inerter can replace the role of the mass block and is completely similar to the capacitor in the circuit network synthesis. The "imaginary mass" simulated by the inerter is called the inertial mass coefficient, and the ratio of the inertial mass coefficient to the real mass of the inerter is called the inertial mass ratio. At present, people have designed various forms and structures of inerters, such as rack and pinion inerters, ball screw inerters, hydraulic inerters, etc. In these implementations, the inertia coefficient is realized by the flywheel mass. Therefore, the method of increasing the inertia coefficient is to increase the mass of the flywheel on the one hand, and to increase the amplification factor of the transmission mechanism on the other hand. For example, the rack and pinion inerter can increase the gear transmission ratio, and the ball screw inerter can reduce Small screw lead. These two approaches all need to increase the weight of the inertial container itself, which is not conducive to the improvement of the inertia-to-mass ratio. Increasing the amplification factor of the transmission mechanism also amplifies the nonlinear factors of the inerter and affects the performance of the inerter.

In order to solve the above-mentioned technical problems, the prior art discloses a method in which the screw shaft is driven to rotate by nut translation and then drives the motor to rotate. By replacing the flywheel in the mechanical inerter with a motor, and connecting negative impedance in series in the motor armature The method of the converter and the large-capacity capacitor effectively improves the inertial mass coefficient and inertial mass ratio of the inerter. But there are following problems:

(1) The rotation of the motor rotor is driven by the rotation of the screw. Due to the small rotation radius of the screw, the moment of inertia is small under the same mass, which is not conducive to improving the inertia-to-mass ratio.

(2) The ball screw transmission pair and the motor are connected in series, the structure is complicated, it is not easy to install and use, and it is difficult to miniaturize and integrate.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an integrated screw electromechanical inerter with improved performance and stability of the inerter and a compact structure.

In order to solve the problems of the technologies described above, the technical solution proposed by the present invention is:

An integrated lead screw electromechanical inerter, comprising a lead screw shaft, a nut rotor, a stator, an armature winding, a permanent magnet and an armature control circuit connected to the armature winding, the permanent magnet is arranged on the nut rotor, and the The armature winding is set on the stator, the nut rotor is threadedly matched with the screw shaft, a thrust bearing is arranged between the nut rotor and the stator, the linear motion of the screw shaft drives the nut rotor to rotate, and the motor The armature winding generates an induced electromotive force when the nut rotor rotates, and the induced electromotive force acts on the armature control circuit.

As a further improvement of the above technical solution:

The stator is provided on the outer periphery of the nut rotor.

The nut rotor includes a rotor nut, the rotor nut is screwed with the screw shaft, and the permanent magnet is installed on the rotor nut.

The stator includes a stator casing, the armature winding is arranged on the stator casing, and the rotor nut is mounted on the stator casing through a thrust bearing.

The armature winding is arranged on the side of the permanent magnet or on the outer periphery of the permanent magnet. The nut rotor is disposed on the outer periphery of the stator.

The nut rotor includes a rotor nut and a rotor casing fixedly connected with the rotor nut, the rotor nut is threadedly matched with the screw shaft, and the permanent magnet is installed on the rotor casing.

The stator includes a coil mounting seat, the armature winding is mounted on the coil mounting seat, and the nut rotor is mounted on the coil mounting seat through a thrust bearing. One end of the screw shaft is fixedly connected to a movable connector, and the other end of the screw shaft is slidably arranged in a anti-rotation sliding hole arranged along the axial direction of the screw shaft.

The armature control circuit includes a capacitor C connected in series and a negative impedance conversion circuit NIC. The armature control circuit includes an external power supply interface and an interface connected to the armature winding.

Compared with the prior art, the present invention has the advantages of:

1. The present invention drives the nut rotor to rotate through the screw shaft, so that the linear moving part is close to the axis and the rotating part is away from the axis, which effectively increases the moment of inertia of the rotating part and further improves the inertia to mass ratio.

2. The screw shaft, armature winding and permanent magnet of the present invention have an integrated structure, which is compact in structure, easy to install and use, and beneficial to engineering and miniaturization.

Description of drawings

Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

Fig. 3 is a schematic structural diagram of Embodiment 3 of the present invention.

Fig. 4 is a schematic diagram of an equivalent circuit structure of the present invention.

Each label in the figure means:

1. Screw shaft; 2. Nut rotor; 21. Rotor nut; 211. Limit boss; 22. Limit nut; 23. Rotor shell; 3. Stator; 31. Stator shell; 32. Coil mounting seat; 4 , Armature control circuit; 5, Armature winding; 6, Thrust bearing; 7, Movable connector; 8, Permanent magnet; 9, Anti-rotation sliding hole.

Detailed ways

The present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1, the integrated lead screw electromechanical container of this embodiment includes a lead screw shaft 1, a nut rotor 2, a stator 3, an armature winding 5, a permanent magnet 8 and an armature control circuit 4. Among them, a thrust bearing 6 is provided between the nut rotor 2 and the stator 3, and the thrust bearing 6 is a two-way thrust bearing. The reciprocating axial force ensures the axial stiffness requirements of the inerter. The permanent magnet 8 is installed on the nut rotor 2 , and the armature winding 5 is installed on the stator 3 . In this embodiment, the nut rotor 2 is threadedly matched with the screw shaft 1, the linear motion of the screw shaft 1 drives the nut rotor 2 to rotate, the armature control circuit 4 is installed on the stator casing 31, and the armature winding 5 and the armature control circuit 4 connection, the armature winding 5 generates an induced electromotive force when the nut rotor 2 rotates, the induced electromotive force acts on the armature control circuit 4, and the induced electromotive force is output to the armature control circuit 4 for storage, and the inertia can be realized by adjusting the armature control circuit 4 The real-time adjustment of the coefficient effectively avoids the problem that it is difficult to achieve the ideal inertial coefficient when the flywheel is used, and improves the performance of the inerter; and the use of an electrical control device effectively avoids the need for a large structural size and large inertial mass when the inerter is a purely mechanical structure The problem of realizing the inerter effect effectively reduces the structural size of the device, reduces the quality of the device, and improves the stability of the inerter. At the same time, the present invention drives the nut rotor 2 to rotate through the screw shaft 1, so that the linear moving parts are close to the axis and the rotating parts are away from the axis, which effectively increases the moment of inertia of the rotating parts and further improves the inertia ratio; and the screw shaft of the present invention 1, the armature winding 5, and the permanent magnet 8 are integrated structures, which are compact in structure, easy to install and use, and are conducive to engineering and miniaturization.

In this embodiment, the stator 3 is arranged on the outer periphery of the nut rotor 2; the stator 3 includes a stator casing 31, and the armature winding 5 is arranged on the stator casing 31; In cooperation, the permanent magnet 8 is installed on the rotor nut 21 . As shown in FIG. 1 , in this embodiment, the armature winding 5 is arranged on the outer periphery of the permanent magnet 8 , and the permanent magnet 8 is inductively matched with the armature winding 5 .

In this embodiment, the rotor nut 21 is installed on the stator casing 31 through the thrust bearing 6, and the thrust bearing 6 is a two-way thrust bearing. The reciprocating axial force of the lever shaft 1 ensures the axial stiffness requirement of the inerter. As shown in Fig. 1 and Fig. 2, in this embodiment, the thrust bearings 6 are divided into two groups, and the two groups of thrust bearings 6 are arranged on both sides of the rotor nut 21, and the rotor nut 21 and the stator casing 31 are provided with mounting brackets for installing the thrust bearings 6. department.

In this embodiment, the nut rotor 2 also includes a limit nut 22, the permanent magnet 8 is installed on the limit boss 211 on the rotor nut 21, the limit nut 22 limits the axial movement of the permanent magnet 8 along the screw shaft 1, and the permanent magnet 8 is permanently The magnet 8 is locked and limited on the limit boss 211 by the limit nut 22 , and the permanent magnet 8 can rotate with the rotor nut 21 . In this embodiment, the permanent magnet 8 is limited in the middle of the rotor nut 21 .

In this embodiment, one end of the screw shaft 1 is located outside the stator housing 31, and the other end is located inside the nut rotor 2. The outer end of the screw shaft 1 is fixedly connected to a movable connector 7, and the movable connector 7 is The movable connector 7 between the screw shaft 1 and the external object, the screw shaft 1 is driven to move axially through the movable connector 7, and the inner end of the screw shaft 1 is slid on a stop arranged axially along the screw shaft 1 In the sliding hole 9; in this embodiment, the movable connector 7 is a lifting lug, and in other embodiments, the screw shaft 1 can be connected with an external object using other structures, such as earrings and flanges. In this embodiment, there are two lifting lugs, one of which is fixedly connected to the screw shaft 1 outside the stator housing 31, and the lifting lug applies axial force to make the screw shaft 1 move along the axial direction of the screw shaft 1. Movement, the other lug is fixed on the stator shell 31.

In this embodiment, the armature control circuit 4 is provided with an external power supply interface and an interface connected with the armature winding 5 . The armature control circuit 4 can specifically be a dual-port circuit network, with a pair of ports serving as interfaces for external power supply, and the other pair of ports being connected in series with the armature winding 5 to form a closed loop. The armature control circuit 4 may also be provided with other interfaces than the above-mentioned interfaces according to actual needs.

In this embodiment, the armature control circuit 4 specifically includes a capacitor C connected in series and a negative impedance conversion circuit NIC. The negative impedance conversion circuit NIC provides a negative impedance and forms a capacitive circuit with the capacitor C, thereby simulating the characteristic of inertial capacity. In other embodiments, the armature control circuit 4 may also adopt other active control circuits with active controllers.

In this embodiment, the inerter and the armature control circuit 4 are equivalent to the equivalent circuit shown in Figure 4, wherein the circuit in the left frame is the equivalent circuit corresponding to the armature winding 5 of the inerter, and the circuit in the right frame It is an equivalent circuit corresponding to the armature control circuit 4. In the equivalent circuit of the armature winding 5 of the inerter, Eeq is the induced electromotive force generated by the armature winding 5, Req is the equivalent resistance of the armature winding 5, and Leq is the equivalent inductance of the armature winding 5. Due to the effect of the negative impedance conversion circuit NIC, the equivalent circuit behaves as a capacitive circuit, and then the additional inertial mass is simulated through the energy storage of the capacitor C. When the nut rotor 2 rotates, the armature winding 5 generates an induced electromotive force Eeq, and when the generated induced electromotive force Eeq is greater than the voltage of the armature control circuit 4, the armature control circuit 4 stores energy through the capacitor C; when the induced electromotive force Eeq is less than the voltage of the armature control circuit 4 When the voltage of the armature control circuit 4 is low, the armature control circuit 4 releases energy through the capacitor C.

In this embodiment, the working process of the integrated screw electromechanical inerter is as follows: the external force pushes the screw shaft 1 to move linearly, and then drives the rotor nut 21 to rotate, and the linear motion is converted into rotary motion, and the rotor nut 21 rotates relative to the stator 3 The armature winding 5 and the permanent magnet 8 on the stator 3 and the nut rotor 2 interact to generate an induced electromotive force, and the induced electromotive force acts on the armature control circuit 4, and the armature control circuit 4 produces an electromagnetic torque that prevents the rotor from rotating and reacts on the The rotor nut 21 further reacts on the screw shaft 1 to prevent the relative linear movement of the movable link 7, thereby achieving the effect of generating a "virtual mass".

Example 2

Fig. 2 shows the embodiment of another kind of integrated lead screw electromechanical container of the present invention, this embodiment is basically the same as the previous embodiment, the difference is that the armature winding 5 of this embodiment is arranged on the permanent magnet The sides of 8 form a disc motor. As shown in FIG. 2 , in this embodiment, there are two armature windings 5 , and the two armature windings 5 are arranged on both sides of the permanent magnet 8 . In other embodiments, as long as it can be ensured that the position where the armature winding 5 can inductively cooperate with the permanent magnet 8 should be within the protection scope of the present invention, such as one armature winding 5, which is arranged on one side of the permanent magnet 8; Alternatively, a plurality of permanent magnets 8 and armature windings 5 arranged axially along the screw shaft 1 are provided, and the two sides of each permanent magnet 8 are correspondingly provided with armature windings 5 .

Example 3

FIG. 3 shows another embodiment of an integrated lead screw electromechanical inerter of the present invention. This embodiment is basically the same as the previous embodiment, except that the nut rotor 2 of this embodiment is arranged on the outer periphery of the stator 3 . Among them, the nut rotor 2 includes a rotor nut 21 and a rotor casing 23, the rotor casing 23 is fixedly connected with the rotor nut 21, the rotor nut 21 is screwed with the screw shaft 1, and the permanent magnet 8 is installed on the rotor casing 23; the stator 3 includes a coil for installation Seat 32 , the armature winding 5 is installed on the coil mounting seat 32 , in this embodiment, the permanent magnet 8 is arranged on the outer periphery of the armature winding 5 , and the permanent magnet 8 is inductively matched with the armature winding 5 . In other embodiments, the permanent magnets 8 can also be arranged on both sides of the armature winding 5 .

In this embodiment, the nut rotor 2 is installed on the coil mounting seat 32 through a thrust bearing 6, and the thrust bearing 6 bears the reciprocating axial force of the screw shaft 1; in this embodiment, one end of the screw shaft 1 It is located on the outside of the rotor housing 23, and the other end is located on the inside of the rotor housing 23. The outer end of the screw shaft 1 is fixedly connected to a movable connector 7, which is the movable connector 7 between the screw shaft 1 and an external object. The screw shaft 1 is driven to move axially through the movable joint 7 , and the inner end of the screw shaft 1 is slidably arranged in a anti-rotation slide hole 9 arranged axially along the screw shaft 1 .

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent implementation of equivalent changes example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. An integrated screw electromechanical inerter, characterized in that it includes a screw shaft (1), a nut rotor (2), a stator (3), an armature winding (5), a permanent magnet (8) and The armature control circuit (4) connected with the armature winding (5), the permanent magnet (8) is arranged on the nut rotor (2), the armature winding (5) is arranged on the stator (3), the The nut rotor (2) is threadedly matched with the screw shaft (1), and a thrust bearing (6) is provided between the nut rotor (2) and the stator (3), and the screw shaft (1) linearly moves to drive the The nut rotor (2) rotates, and the armature winding (5) generates an induced electromotive force when the nut rotor (2) rotates, and the induced electromotive force acts on the armature control circuit (4). 2 . The integrated screw electromechanical inerter according to claim 1 , characterized in that, the stator ( 3 ) is arranged on the outer periphery of the nut rotor ( 2 ). 3 . 3. The integrated lead screw electromechanical container according to claim 2, characterized in that, the nut rotor (2) includes a rotor nut (21), and the rotor nut (21) is connected to the screw shaft (1) Threaded fit, the permanent magnet (8) is installed on the rotor nut (21). 4. The integrated lead screw electromechanical container according to claim 3, characterized in that, the stator (3) includes a stator housing (31), and the armature winding (5) is arranged on the stator housing ( 31), the rotor nut (21) is installed on the stator housing (31) through a thrust bearing (6). 5. The integrated lead screw electromechanical inerter according to claim 4, characterized in that the armature winding (5) is arranged on the side of the permanent magnet (8) or on the side of the permanent magnet (8) ) of the periphery. 6 . The integrated screw electromechanical inerter according to claim 1 , characterized in that, the nut rotor ( 2 ) is arranged on the outer periphery of the stator ( 3 ). 7. The integrated lead screw electromechanical container according to claim 6, characterized in that, the nut rotor (2) includes a rotor nut (21) and a rotor housing (23) fixedly connected to the rotor nut (21) , the rotor nut (21) is threadedly engaged with the screw shaft (1), and the permanent magnet (8) is installed on the rotor housing (23). 8. The integrated lead screw electromechanical inerter according to claim 7, characterized in that, the stator (3) includes a coil mounting base (32), and the armature winding (5) is mounted on the coil mounting base On the seat (32), the nut rotor (2) is mounted on the coil mounting seat (32) through a thrust bearing (6). 9. The integrated lead screw electromechanical container according to any one of claims 1 to 8, characterized in that one end of the lead screw shaft (1) is fixedly connected to a movable connector (7), and the screw The other end of the lever shaft (1) is slidably arranged in a anti-rotation sliding hole (9) arranged axially along the screw shaft (1). 10. The integrated lead screw electromechanical inerter according to any one of claims 1 to 8, characterized in that the armature control circuit (4) includes a capacitor C connected in series and a negative impedance conversion circuit NIC, so The armature control circuit (4) includes an external power supply interface and an interface connected to the armature winding (5).