Motor-vibrator assembly for a vibrating machine

Abstract

A motor-vibrator assembly for a vibrating machine, having a plurality of motor-vibrators (6), each motor-vibrator having a synchronous motor (9) and at least one eccentric mass (10) split into two bodies (10a, 10b) fixed to two respective free ends of a shaft (11) of the motor (9). The motor-vibrator assembly (5) comprises position sensing means (15; 15a) to sense the angular position and angular velocity of the shaft (11) of the synchronous motor (9), electronic driving means (14) to operate the synchronous motor (9), and an electronic control unit (19) configured to control the electronic driving means (14) on the basis of the sensed angular position and angular velocity, so that the motor-vibrator assembly (5) generates a predetermined vibratory motion.

Description

[0001] Citations of relevant applications

[0002] This patent application claims priority to Italian Patent Application No. 102020000026819, filed on November 10, 2020, and Italian Patent Application No. 102021000015338, filed on June 11, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a motor-vibrator assembly for a vibratory machine. Background Technology

[0004] Different types of vibratory machines are known, differing in their structure and overall shape for their specific purpose or application. Some examples of vibratory machines are: vibratory feeders for supplying materials to material processing stations; vibratory screens for sieving granular or powdered materials; vibratory extractors for silos or hoppers to facilitate the extraction of granular or powdered materials from silos or hoppers; vibratory conveyor pipes; vibratory tables for conducting different types of tests or compacting granular or powdered materials; sand removal devices for separating sand from castings; and vibratory gravity separators that use the different specific gravities of materials to separate different materials.

[0005] The aforementioned examples of vibratory machines all share the common fact that they all include: a fixed base designed to rest on the ground or floor; a body, such as a tray, sieve, wall, or support beam, mounted on the base by elastic devices (such as springs or rubber elements); and a motor-vibrator assembly, which typically includes multiple motors-vibrators fixed to the body to generate a predetermined vibrational motion and transmit that motion to the body. Depending on the specific purpose or application, the generated vibrational motion may be, for example, linear reciprocating motion, circular motion, or elliptical motion.

[0006] Each motor-vibrator consists of a synchronous motor and an eccentric mass fixed to the motor's shaft. Motor-vibrator assemblies often include mechanical joints (such as universal joints) to connect the motor shafts to each other so as to allow the motors to synchronize with each other, i.e., to maintain a certain angular deviation (phase displacement) between the centers of mass of the eccentric mass to produce the desired vibrational motion.

[0007] The installation, protection, setup, and maintenance of the aforementioned mechanical joints are difficult and therefore very economical.

[0008] Another type of motor-vibrator assembly exists, comprising: multiple vibrating units; and a motor that operates the vibrating units via a drive shaft. Each of these multiple vibrating units includes an eccentric mass interconnected with each other via numerous oil-bath drive components according to a modular structure, and the vibrating units of the same vibrator are typically interconnected via mechanical joints. Despite the presence of a lubricating oil bath, the large number of moving parts (which are also subject to significant vibrations intentionally generated by the motor-vibrator assembly) causes severe wear at the joints of the drive components, thus requiring frequent replacement and / or maintenance.

[0009] US Patent No. 6,213,630B1 discloses an unbalanced vibrator for a stone forming machine, specifically designed for compacting concrete components during manufacturing. The vibrator comprises: a vibrating table; an unbalanced shaft disposed on the vibrating table; and an electric motor assigned to the unbalanced shaft for driving it, wherein the electric motor has means for controlling and adjusting the rotational speed and / or relative phase position of the unbalanced shaft. The electric motor is designed as a servo motor and is equipped with means including a sine-cosine gearbox that determines the angular position and rotational speed of the unbalanced shaft.

[0010] U.S. Patent Application No. US 2019 / 0344311 A1 discloses a vibration drive system suitable for material screening equipment. The vibration drive system includes rotatable drive shafts, each having a center of mass offset from its axis of rotation. A corresponding drive mechanism is coupled to each drive shaft and controlled by a controller. The controller adjusts the relative rotational speed of the drive shafts to adjust the relative angular position of the respective centers of mass of the drive shafts.

[0011] U.S. Patent Application No. US 2011 / 0303252 A1 discloses a method for measuring the moment of inertia of a washing machine drum containing a load. The drum is rotated by a permanent magnet synchronous motor.

[0012] Russian Patent No. RU2572657C1 discloses a method for automatically setting the resonance mode of an oscillation of a vibrator driven by an induction motor.

[0013] Chinese Patent Application No. CN110967056A discloses a vibration displacement sensor for a displacement measuring instrument, which is used to measure mechanical vibration. Summary of the Invention

[0014] The objective of this invention is to provide a motor-vibrator assembly for a vibratory machine that does not suffer from the disadvantages discussed above, and can be manufactured in a simple and economical manner.

[0015] According to the present invention, a motor-vibrator assembly, a vibrator, and a method for controlling the vibrator are provided. Attached Figure Description

[0016] The invention will now be described with reference to the accompanying drawings, which illustrate non-limiting embodiments of the invention, in which:

[0017] - Figure 1 An isometric view of a vibratory machine including a motor-vibrator assembly according to the present invention is shown;

[0018] - Figure 2 It shows Figure 1 A cross-sectional view of the vibratory machine; and

[0019] - Figure 3 schematically shown Figure 1 The motor-vibrator assembly of a vibratory machine;

[0020] - Figure 4 It shows Figure 1 Another embodiment of the motor-vibrator assembly of the vibratory machine;

[0021] - Figure 5 It shows Figure 1 A side view of a vibratory machine, showing the vibrational motion generated by a motor-vibrator;

[0022] - Figure 6 and Figure 7 It shows Figure 1 The same side view of the corresponding embodiment of the vibratory machine;

[0023] - Figure 8 An embodiment according to another embodiment is shown. Figure 3 Representation of the angular velocity curve of the shaft of one of the motors in a multi-motor-vibrator system;

[0024] - Figure 9 It shows the result of Figure 8 The representation of the vibrational motion generated by the angular velocity curve;

[0025] - Figure 10 It shows Figure 1 Another embodiment of the motor-vibrator assembly of the vibratory machine; and

[0026] - Figure 11 and Figure 12 It shows Figure 1 The same side view of the corresponding embodiment of the vibratory machine. Detailed Implementation

[0027] exist Figure 1In this context, the number 1 generally represents a vibratory machine located as a whole on a base 2. The vibratory machine 1 includes: a body 3, which can be mounted on the base 2 by means of a plurality of known elastic elements 4; and a motor-vibrator assembly 5, which includes a plurality of motor-vibrators 6 fixed to the body 3 to generate a predetermined vibrational motion and transmit the vibrational motion to the body 3.

[0028] In the example shown in this article, the vibratory feeder 1 is a vibratory feeder, wherein the body 3 includes a grid bottom 7 and two side walls 8 parallel to each other, there are four elastic elements 4, and the motor-vibrator assembly 5 includes two motor-vibrators 6, each motor-vibrator being fixed to a corresponding side wall 8.

[0029] According to a variant not shown in this document, the base 2 consists of a ground or floor, i.e., the elastic element 4 has a corresponding end that can be fixed to the ground or floor.

[0030] refer to Figure 2 Each motor-vibrator 6 includes a motor 9 and an eccentric mass 10, the eccentric mass being fixed to, or integrated into, the shaft 11 of the motor 9. The shaft 11 rotates about a corresponding axis 11a. In the example shown herein, the motor 9 is arranged through a hole (not shown) in a sidewall 8, where the axis 11a is perpendicular to the sidewall 8, and the motor has its own housing 12, which is provided with flanges 13 fixed to the sidewall 8. The eccentric mass 10 is divided into two bodies 10a and 10b, which are fixed (i.e. integrated) to the two free ends of the shaft 11. The two free ends of the shaft 11 extend from the housing 12 in the regions of the two corresponding opposing longitudinal ends of the motor 9. Each of the two bodies 10a and 10b has a substantially semi-cylindrical shape relative to the axis 11a. The two motor-vibrators 6 are fixed to the corresponding sidewall 8 so as to be coaxial with each other, i.e., the axes 11a of the corresponding shaft 11 coincide on one axis.

[0031] refer to Figure 3 Each motor 9 is a synchronous motor (e.g., a permanent magnet brushless motor or a reluctance motor) and can be operated by its own electronic drive unit 14. Each motor-vibrator 6 includes its own position sensing device to sense the angular position of the shaft 11 and measure the angular velocity of the shaft. Figure 3In the example shown, the position sensing device includes a position sensor 15 located on the motor 9 of the respective motor-vibrator 6. An electronic drive unit 14 is located on the respective motor 9 and, specifically, integrated into the housing 12. Each electronic drive unit 14 includes a frequency converter 16 designed to operate the respective synchronous motor 9 in a known manner based on instructions from an electronic control unit. The position sensor 15 includes an angle encoder consisting of a tone wheel 17 integrated into the shaft 11 and a sensor element 18 fixed to the housing 12 and facing the tone wheel 17, for reading the angular movement of the tone wheel in a known manner.

[0032] Refer again Figure 3 The motor-vibrator assembly 5 includes an electronic control unit 19, which is configured to control the electronic drive device 14 of the motor 9 based on the angular position sensed by the position sensor 15 and the measured angular velocity, so that the motor-vibrator assembly 5 produces a predetermined vibration motion.

[0033] According to another embodiment of the invention, not shown herein, the electronic drive unit 14 is not integrated into the corresponding motor 9. As an example, the electronic drive unit 14 is located on the electronic control unit 19.

[0034] According to another embodiment of the invention not shown herein, each drive unit 14 includes a pair of frequency converters 16 to operate two different motors - a pair of motors 9 of the vibrator 6.

[0035] according to Figure 4 Another embodiment of the invention is shown in the figure, wherein the corresponding element is used with Figure 3 The same numbers indicate that the position sensing device includes multiple electromagnetic flux observation devices (in Figure 4 (Represented by 15a in the text), instead of position sensor 15, each electromagnetic flux observation device is integrated into a corresponding electronic drive unit 14 and designed to determine the relative angular position between the rotor and stator of the corresponding motor 9, and thus determine the angular position of the corresponding shaft 11. That is, according to Figure 4 In one embodiment, the motor-vibrator assembly 5 includes a sensorless electronic drive 14 to sense the position of the corresponding motor 9 and measure the angular velocity of the motor in the absence of a position sensor 15.

[0036] Figure 5 A side view of a portion of the vibratory machine 1 is shown (i.e., a view in the direction of observation parallel to the axis 11a of the motor 9). In this figure, numeral 20 represents an axis parallel to axis 11a and passing through the center of gravity of the body 3 undergoing vibratory motion, and numeral 21 represents an axis parallel to axis 11a and passing through... Figure 5 The axis of the center of gravity of the eccentric mass 10 of the motor-vibrator 6 shown. That is, in Figure 5 In the diagram, the center of gravity of the main body 3 and the center of gravity of the eccentric mass 10 correspond to axes 20 and 21, respectively, and therefore will be represented by the same numbers in the following text. The angular position of the center of gravity 21 relative to the polar coordinate system centered on axis 11a is defined by the radial direction passing through axis 11a and the center of gravity 21, and... Figure 5 The Chinese character is represented by 22.

[0037] The electronic control unit 19 is configured to control the electronic drive unit 14 of the two motor-vibrators 6 so that the shaft 11 rotates according to the corresponding angular velocity curve along the rotation angle and according to the corresponding rotation direction, thereby keeping the center of gravity 21 of the eccentric mass 10 in phase with each other.

[0038] The phase of the center of gravity 21 is defined by the initial angular position of the center of gravity 21 (i.e., the angular position at the initial instant of the operation of the motor-vibrator 5). When the deviation between the corresponding phases is zero, the centers of gravity 21 are considered to be in phase with each other.

[0039] Specifically, the velocity curves of the two motor-vibrator 6 are identical and include an angular velocity equal to a constant value VK along the entire rotation angle, as well as... Figure 5 The two rotational directions, represented by 23, coincide. Due to the constant rotational speed VK and the coincident rotational directions, the phase of the two centroids 21 is allowed to remain constant (zero phase displacement).

[0040] Advantageously, the electronic control unit 19 is configured to first position the shaft 11 of the motor vibrator 6 so that the centers of gravity 21 are in phase with each other, and then rotate the shaft 11 with a corresponding angular velocity curve along the rotation angle and in the corresponding rotation direction.

[0041] Figures 1 to 4 The structure of the motor-vibrator assembly 5 generates circular vibration motion (in Figure 5 (represented by 24), which can be represented as a circular rotation about an axis parallel to the center of gravity 20.

[0042] according to Figure 6 Another embodiment of the invention shown in the figure includes a motor-vibrator assembly 5 and a reference. Figures 1 to 4 The difference in the described motor-vibrator assembly lies in that, for each sidewall 8, the assembly includes two motor-vibrators 6, which are fixed to the sidewall in the manner described above and arranged with corresponding axes 11a perpendicular to direction 25. The two motor-vibrators 6 of one sidewall 8 are coaxial with the corresponding two motor-vibrators 6 of the other sidewall 8. Furthermore, the electronic control unit 19 is configured to control the electronic drive unit 14 of the two motor-vibrators 6 of each sidewall 8 with the same angular velocity curve (equal to a constant value VK) and in opposite directions of rotation. The center of gravity 21 of the eccentric mass 10 remains in phase with each other in the same manner described above.

[0043] Figure 6 The motor-vibrator assembly 5 is constructed to generate linear reciprocating vibration motion along the axis and direction 26 perpendicular to the center of gravity 20 and direction 25.

[0044] according to Figure 7 Another embodiment of the invention shown in the figure includes a motor-vibrator assembly 5 and a reference. Figure 6 The difference in the described motor-vibrator assembly is that, for each sidewall 8, the assembly includes three motor-vibrators 6, which are arranged with corresponding axes 11a at the vertices of a triangle. The triangle has two apex vertices located in a given direction 27 and a third vertex facing downwards relative to direction 27. That is, the two motor-vibrators 6 located at the two apex vertices of the triangle have corresponding axes 11a perpendicular to direction 27.

[0045] Furthermore, the electronic control unit 19 is configured to control the electronic drive units 14 of the three motor-vibrators 6 at each sidewall 8, such that the rotation direction 28 of the shaft 11 of the motor-vibrator 6 at the top vertex of the triangle is opposite to the rotation direction of the shaft 11 of the other two motor-vibrators 6, and that the centers of gravity 21 of the two motor-vibrators 6 at the two top vertexes of the triangle remain in phase with each other, while the center of gravity 21 of the third motor-vibrator 6 deviates from each other by an angle or phase. The center of gravity 21 of the other two motor-vibrator 6 is out of phase. Figure 7 In the example, angular deviation It equals 90°.

[0046] Advantageously, the electronic control unit 19 is configured to first position the shaft 11 of the motor-vibrator 6 such that the centers of gravity 21 of the two motor-vibrators 6 located at the two apexes of the triangle are in phase with each other, and the center of gravity 21 of the third motor-vibrator 6 is aligned according to the angular deviation. The first two motor-vibrators are out of phase, which causes shaft 11 to rotate.

[0047] Figure 7 The structure of the motor-vibrator assembly 5 produces a substantially elliptical vibration motion (in... Figure 7 (represented by 29), which can be represented as a rotational motion about an axis parallel to the center of gravity 20. This vibrational motion is essentially elliptical in shape, with a principal axis transverse to direction 27.

[0048] According to the reference Figure 1 , Figure 2 , Figure 3 and Figure 8Another embodiment, namely, an embodiment in which there is one motor-vibrator 6 on each sidewall 8, has the same velocity curve and rotation direction of the shaft 11, the same center of gravity 21 of the two motor-vibrators 6, and the angular velocity curve of each shaft 11 includes a angular portion. ( Figure 8 In this corner section, the angular velocity first increases from a constant value VK to a maximum value VM, and then decreases from the maximum value VM back to a constant value VK in order to correct for the eccentric mass 10 in the corner section. The imbalance at the corner. The polar coordinate system, relative to the main body 3 integrated into the vibratory machine, is concentrated at a predetermined angular position. In the middle. At the corner section Complementary corner sections ( Figure 8 In the case of ), the angular velocity remains equal to a constant value VK. Figure 8 The above-described velocity curve is shown in the example diagram, where the corner portion is shown. It is 110° and the angular position It's 45°.

[0049] Figure 1 , Figure 2 , Figure 3 and Figure 8 The structure of the motor-vibrator assembly 5 generates complex vibrational motion (in Figure 9 (represented by 30 in the text), this vibrational motion can be represented as rotation about an axis parallel to the center of gravity 20. This vibrational motion is essentially shaped like a cam, which has a shape that varies according to angular position. Oriented spindle 31.

[0050] Vibration motion 30 can be achieved by changing the maximum angular velocity VM and the rotation angle. Width and angular position To configure it. In other words, Figure 1 , Figure 2 , Figure 3 and Figure 8 The construction of the motor-vibrator assembly 5 defines the electronic cam.

[0051] according to Figure 10 Another embodiment shown in the figure, wherein the corresponding element is used with Figure 3 The same numbers indicate that each motor-vibrator 6 includes a corresponding accelerometer 32 on the plate to sense the vibrations experienced by the motor-vibrator 6. Specifically, the accelerometer 32 is fixed to the housing 12 of the motor 9. The accelerometer 32 is a triaxial accelerometer.

[0052] The electronic control unit 19 is configured to process the vibration sensed by the accelerometer 32 to determine the vibration state of the motor-vibrator assembly 5, and to control the electronic drive unit 14 of the motor 9 based not only on the angular position sensed by the position sensor 15 and the measured angular velocity, but also on the vibration state. Specifically, the electronic control unit 19 is configured to adjust the angular deviation between the angular velocity curve of the shaft 11 and / or the phase of the corresponding center of gravity 21 of the eccentric mass 10 based on the aforementioned vibration state. Adjustment of the angular velocity curve refers to adjustment of the angular velocity value.

[0053] According to another embodiment of the invention not shown herein, the vibrating machine 1 includes a plurality of reference assemblies. Figure 10 The described type of motor-vibrator assembly 5, these motor-vibrator assemblies are, for example, of the type described. Figure 6 and Figure 7 The arrangement is shown in the figure.

[0054] according to Figure 11 Another embodiment shown in the figure, wherein the corresponding element is used with Figure 5 The same numbers indicate that the motor-vibrator assembly 5 includes an accelerometer 32 ( Figure 3 The vibratory motor 1 includes one or more accelerometers 33 fixed at appropriate points in the body 3, such as at two longitudinal ends of each sidewall 8 of the body 3, to sense vibrations experienced by the body 3. The electronic control unit 19 is configured to process the vibrations sensed by the accelerometers 32 and processed by the accelerometers 33 to determine the vibration state of the motor-vibrator assembly 5, and to control the electronic drive unit 14 based on the angular position sensed by the position sensor 15, the measured angular velocity, and the vibration state.

[0055] The main body 3 of the vibratory machine 1 is designed to contain the material to be processed by a predetermined vibrational motion. In a specific example shown in the accompanying drawings, and specifically in… Figure 1 and Figure 2 In this diagram, the vibrating machine 1 is a vibrating feeder that screens materials placed on the grid 7. The vibrating machine 1 receives materials from an upstream processing step and specifically from another machine (not shown in the drawings and having a container or loading plane).

[0056] according to Figure 12 Another embodiment shown in the figure, wherein the corresponding element is used with Figure 11The same figures indicate that another machine supplying material to the vibratory machine 1 is provided with one or more load units 34 arranged below the container or loading plane to sense the load of material in the other machine and specifically measure the weight of the material present in the container or loading plane before the material is transferred to the vibratory machine 1. The electronic control unit 19 is configured to control the electronic drive unit 14 based on the sensed load.

[0057] The above is for reference only. Figures 10 to 12 The described implementation provides a method for controlling a vibratory machine 1, which automatically adjusts to adapt to the current and future loads of the vibratory machine 1.

[0058] Specifically, in the above references Figure 10 and Figure 11 In the described embodiment, the motor-vibrator assembly 5 automatically adjusts to adapt to the load of the vibrator 1, i.e., to adapt to the actual amount of material contained in the body 3, in order to quickly achieve the predetermined vibration motion. In fact, the angular deviation between the angular velocity curve and the phase of the center of gravity 21 of the eccentric mass 10 is predetermined based on the assumed load of the vibrator 1. If the load of the vibrator 1 changes relative to the assumed load, the vibration motion generated by the motor-vibrator assembly 5 may not be the desired vibration motion.

[0059] Figure 11 The implementation allows for more precise adjustment because the vibration state is determined based on a larger amount of information, namely, the vibration sensed not only on the motor 9 of the motor-vibrator 6, but also on the vibration sensed directly on the body 3 of the vibrator 1.

[0060] Figure 12 The implementation method enables predictive adjustment because the upstream processing step of the vibrator 1 uses information provided by the load unit 34.

[0061] The main advantage of the motor-vibrator assembly 5 disclosed above is its rapid setup. This is because, unlike known motor-vibrators, the disclosed motor-vibrator assembly eliminates the need for mechanical joints to synchronize the eccentric mass, thanks to the use of a synchronous motor equipped with a position sensor and controlled by an electronic control unit. Furthermore, the use of a synchronous brushless motor and the absence of mechanical joints reduce the number of mechanical parts subjected to friction, thereby reducing wear on the motor's sole bearing.

[0062] Another advantage is that even using a single motor-vibrator 6, the speed curve of the synchronous motor can be precisely controlled along the rotation angle, thereby generating complex vibrational motions. The use of accelerometers 32 and 33 mounted on the motor-vibrator 6 and the main body 3 of the vibrator 1 allows the behavior of the motor-vibrator assembly 5 to be adjusted according to the load of the vibrator 1 in order to quickly reach the predetermined vibrational motion.

[0063] Another advantage is that the eccentric mass 10 is divided into two main bodies 10a and 10b, which are fixed to the free end of the shaft 11 of the motor 9. This configuration allows for balancing to reduce wear on the bearings of the motor 9, and at the same time allows a single motor-vibrator 6 to be mounted on any part of any vibratory machine. For example, in the case where the vibratory machine is a vibratory table, the housing 12 of the motor 9 of the single motor-vibrator 6 includes multiple feet that can be fixed to the horizontal portion of the vibratory table, instead of flanges 13.

Claims

1. A motor-vibrator assembly for a vibratory machine, the motor-vibrator assembly (5) comprising: Multiple motor-vibrators (6), each of the multiple motor-vibrators comprising a motor consisting of a synchronous motor (9) and at least one eccentric mass (10) connected to a drive shaft (11) of the synchronous motor (9); a position sensing device (15; 15a) for sensing the angular position of the drive shaft (11) and measuring the angular velocity of the drive shaft; An electronic drive device (14) for driving the synchronous motor (9); and an electronic control device (19) configured to control the electronic drive device (14) based on the sensed angular position and the measured angular velocity, such that the motor-vibrator assembly (5) produces a predetermined vibrational motion; the motor-vibrator assembly (5) is characterized in that the eccentric mass (10) is fixed to the drive shaft (11) of the associated synchronous motor (9), and the eccentric mass is divided into two bodies (10a, 10b) fixed to two corresponding free ends of the drive shaft (11), the two corresponding free ends of the drive shaft (11) extending from the housing (12) of the synchronous motor (9) in the region of two corresponding opposite longitudinal ends of the synchronous motor (9), wherein the electronic control device (19) is configured to control the electronic drive device (14) so ​​as to keep the centers of gravity (21) of the eccentric mass (10) in phase with each other or according to a predetermined angular deviation ( The centers of gravity of the eccentric masses are kept out of phase, so that the drive shaft (11) rotates according to the corresponding angular velocity curve along the rotation angle and the corresponding rotation direction in order to obtain the predetermined vibration motion.

2. The motor-vibrator assembly according to claim 1, wherein, The electronic control device (19) is configured to control the electronic drive device (14) to position the drive shaft (11) such that the centers of gravity (21) are arranged in phase with each other or according to the angular deviation ( The drive shaft (11) is out of phase with each other, and then moves along the angular velocity curve of the rotation angle and the direction of rotation.

3. The motor-vibrator assembly according to claim 1 or 2, wherein, Each angular velocity curve in the angular velocity curves includes at least a first turning angle portion. In the first turning section, the angular velocity is equal to the first velocity value (VK).

4. The motor-vibrator assembly according to claim 3, wherein, Each angular velocity curve in the angular velocity curves includes at least a second turning angle portion. In the second corner portion, the angular velocity first increases from the first velocity value (VK) to a maximum velocity value (VM), and then decreases from the maximum velocity value (VM) back to the first velocity value (VK) to correct the corresponding eccentric mass (10) in the second corner portion. Centrifugal force in ).

5. The motor-vibrator assembly according to claim 4, wherein, The first corner section ( ) and the second corner section ( They complement each other.

6. The motor-vibrator assembly according to claim 1 or 2, wherein, The electronic drive device includes a plurality of electronic drive units, each of which is designed to drive a corresponding synchronous motor (9).

7. The motor-vibrator assembly according to claim 6, wherein, Each of the electronic drive devices is mounted on the corresponding synchronous motor (9).

8. The motor-vibrator assembly according to claim 6, wherein, Each of the electronic drive units includes a frequency converter (16).

9. The motor-vibrator assembly according to claim 1 or 2, wherein, For each synchronous motor (9), the position sensing device (15) includes a corresponding encoder (17, 18) mounted on the synchronous motor (9), the encoder including: a tone wheel (17) integrated into the drive shaft (11); and a sensor element (18) fixed to the housing (12) of the synchronous motor (9) to read the angular movement of the tone wheel (17).

10. The motor-vibrator assembly according to claim 1 or 2, wherein, For each synchronous motor (9), the position sensing device includes a corresponding electromagnetic flux observation device (15a) to determine the relative angular position between the rotor and stator of the synchronous motor (9).

11. The motor-vibrator assembly according to claim 1 or 2, wherein, Each motor-vibrator (6) includes a corresponding first acceleration sensing device (32) fixed to the housing (12) of the synchronous motor (9) to detect a first vibration, and the electronic control device (19) is configured to process the sensed first vibration in order to determine the vibration state of the motor-vibrator assembly (5) and control the electronic drive device (14) based on the vibration state.

12. The motor-vibrator assembly according to claim 1 or 2, wherein, Each motor-vibrator (6) includes a corresponding first acceleration sensing device (32) fixed to the housing (12) of the synchronous motor (9) to sense a first vibration, and the electronic control device (19) is configured to process the sensed first vibration in order to determine the vibration state of the motor-vibrator assembly (5) and adjust the angular velocity curve and / or the angular deviation based on the vibration state. ).

13. A vibrating machine, comprising: Body (3); elastic device (4) for mounting the body (3) on the base (2); The vibrator (1) is characterized in that the motor-vibrator assembly (5) includes a plurality of motor-vibrators (6) fixed to the body (3) to generate a predetermined vibration motion and transmit the predetermined vibration motion to the body (3).

14. A vibrating machine, comprising: Body (3); elastic device (4) for mounting the body (3) on the base (2); and a motor-vibrator assembly (5), the motor-vibrator assembly including a plurality of motor-vibrators (6) fixed to the body (3) to generate a predetermined vibration motion and transmit the predetermined vibration motion to the body (3), the vibrator (1) being characterized in that the motor-vibrator assembly (5) is The motor-vibrator assembly according to claim 11 or claim 12, wherein the vibrator includes a second acceleration sensing device (33) fixed to the body (3) to sense a second vibration; the electronic control device (19) is configured to process the sensed first vibration and the sensed second vibration in order to determine the vibration state of the motor-vibrator assembly (5).

15. A method for controlling a vibratory machine, the vibratory machine comprising a body (3), an elastic device (4) mounting the body (3) on a base (2), and a motor-vibrator assembly (5), the motor-vibrator assembly comprising: A plurality of motor-vibrators (6), each of the plurality of motor-vibrators being fixed to the body (3) and comprising a synchronous motor (9) and at least one eccentric mass (10) fixed to a drive shaft (11) of the synchronous motor (9), the eccentric mass (10) being divided into two bodies (10a, 10b), the two bodies being fixed to two free ends of the drive shaft (11), the two free ends of the drive shaft (11) extending from the housing (12) of the synchronous motor (9) in the region of two corresponding opposite longitudinal ends of the synchronous motor (9); A position sensing device (15; 15a) is used to sense the angular position of the drive shaft (11) and measure the angular velocity of the drive shaft. An electronic drive device (14) for driving the synchronous motor (9), and an electronic control device (19) configured to control the electronic drive device (14) so ​​as to keep the centers of gravity (21) of the eccentric masses (10) in phase with each other or according to a predetermined angular deviation. The method involves maintaining the centers of gravity of the eccentric masses out of phase, such that the drive shaft (11) rotates according to the corresponding angular velocity curve along the rotation angle and the corresponding rotation direction to obtain a predetermined vibration motion; the method includes: - The first vibration is sensed by a first acceleration sensing device (32) fixed to the housing (12) of the synchronous motor (9); - Process the sensed first vibration to determine the vibration state of the motor-vibrator assembly (5); and - The electronic drive device (14) is controlled based on the sensed angular position, the measured angular velocity and the vibration state, so that the motor-vibrator assembly (5) generates the predetermined vibration motion.

16. The method of claim 15, further comprising: - The second vibration is sensed by a second acceleration sensing device (33) fixed to the main body (3); The sensed first vibration is processed together with the sensed second vibration in order to determine the vibration state of the motor-vibrator assembly (5).

17. The method according to claim 15 or 16, wherein, The body (3) is designed to contain material to be processed by the vibration motion, and the vibratory machine (1) receives material from another machine, the method comprising: - The load on the material in the other machine is sensed by a load sensing device, and then the material is transferred to the vibratory machine; The electronic drive device (14) is controlled based on the sensed load.

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