CN212258666U

CN212258666U - Motor rotating shaft dynamic balance device and motor

Info

Publication number: CN212258666U
Application number: CN202021716777.5U
Authority: CN
Inventors: 刘怡迪; 樊钊; 刘振邦
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2020-12-29
Anticipated expiration: 2030-08-17

Abstract

The application provides a motor shaft dynamic balance device and a motor. This motor shaft dynamic balance device includes main shaft (1), detecting element (2), the control unit (3) and balanced unit, balanced unit sets up on main shaft (1), balanced unit includes two at least balancing pieces (4) of arranging along circumference, each balancing piece (4) intussuseption is filled with magnetic particle, detecting element (2) electric connection to the control unit (3), detecting element (2) are used for detecting the vibration signal of main shaft (1), the control unit (3) are used for exerting the electric current to each balancing piece (4) according to the vibration signal control that detecting element (2) detected. According to the motor rotating shaft dynamic balancing device, the unbalance amount of the motor rotating shaft during rotation can be accurately balanced, and the rotating shaft dynamic balancing automatic balancing function is achieved.

Description

Motor rotating shaft dynamic balance device and motor

Technical Field

The application relates to the technical field of motors, in particular to a motor rotating shaft dynamic balancing device and a motor.

Background

The frequency of faults in rotating machines is high because of continuous operation, and over 30% of faults are caused by rotor imbalance. The rotor of the rotating motor is an important part for outputting kinetic energy by bearing electromagnetic force, and when the rotor has unbalanced mass failure, the load of a bearing is increased, the abrasion is intensified, severe vibration and noise are formed, and the service life of the motor is greatly shortened; therefore, how to minimize the unbalance amount of the rotor and improve the dynamic balance test level of the rotor is an important key process in improving the manufacturing quality of the motor rotor.

In the prior art, a test method for rotating balance of a rotating shaft is to calculate the unbalance amount of a rotor rotating on a balancing machine through the balancing machine and then to add weight or remove weight to the rotor. However, the quality of the dynamic balance test process of the rotating shaft is low, and the test is not accurate, so that the measurement of the residual unbalance of the rotor is not accurate, the vibration of the motor is large, and the dynamic balance test process of the rotor fails.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a motor shaft dynamic balance device and motor, can the accurate unbalance amount when balancing motor shaft rotates, realizes the automatic balancing function of pivot dynamic balance.

In order to solve the above problem, the present application provides a motor shaft dynamic balance device, including the main shaft, detecting element, the control unit and balanced unit, balanced unit sets up on the main shaft, balanced unit includes two at least balancing pieces of arranging along circumference, each balancing piece intussuseption is filled with magnetic particle, detecting element electric connection to the control unit, detecting element is used for detecting the vibration signal of main shaft, the control unit is used for exerting the electric current to each balancing piece according to the vibration signal control that detecting element detected.

Preferably, each weight is of uniform gauge.

Preferably, at least part of the adjacent balance blocks are arranged at intervals along the circumferential direction of the main shaft; or the balance blocks are fan-shaped, and the balance blocks are sequentially arranged along the circumferential direction of the main shaft to form a circular balance unit.

Preferably, each weight is controlled individually.

Preferably, part of the balancing masses form an independent control loop.

Preferably, the weight is adhesively secured by insulating glue.

Preferably, a rotor is arranged on the main shaft, and two ends of the rotor are respectively provided with a balancing unit.

According to another aspect of the present application, there is provided an electric motor, including a motor shaft dynamic balancing device, which is the above-mentioned motor shaft dynamic balancing device.

The application provides a motor shaft dynamic balance device, including the main shaft, detecting element, the control unit and balanced unit, balanced unit sets up on the main shaft, balanced unit includes two at least balancing pieces of arranging along circumference, each balancing piece intussuseption is filled with magnetic particle, detecting element electric connection to the control unit, detecting element is used for detecting the vibration signal of main shaft, the control unit is used for applying the electric current to each balancing piece according to the vibration signal control that detecting element detected. The motor rotating shaft dynamic balancing device is additionally provided with the balancing unit on the main shaft, the unbalance amount and the unbalance position of the main shaft can be determined according to the vibration signal, then the balance blocks of the balancing unit can be correspondingly adjusted according to the determined unbalance amount and the determined unbalance position, the magnetic field is excited by applying the control current to the balance blocks to be adjusted, and the gravity center of the balance blocks is changed by changing the positions of magnetic particles in the balance blocks, so that the unbalance amount of the main shaft is compensated, the unbalance amount of the main shaft is accurately balanced, the rotating shaft dynamic balancing automatic balancing function is realized, repeated measurement and correction are not needed, the time cost is saved, and meanwhile, the main shaft is prevented from being damaged when the main shaft is weighted and removed.

Drawings

Fig. 1 is a structural view of a dynamic balancing apparatus of a motor shaft according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a balancing unit of the motor shaft dynamic balancing apparatus according to the embodiment of the present application.

The reference numerals are represented as:

1. a main shaft; 2. a detection unit; 3. a control unit; 4. a counterbalance; 5. and a rotor.

Detailed Description

Referring to fig. 1 to 2 in combination, according to an embodiment of the present disclosure, a motor shaft dynamic balancing apparatus includes a main shaft 1, a detection unit 2, a control unit 3, and a balancing unit, where the balancing unit is disposed on the main shaft 1, the balancing unit includes at least two balancing blocks 4 arranged along a circumferential direction, each balancing block 4 is filled with magnetic particles, the detection unit 2 is electrically connected to the control unit 3, the detection unit 2 is configured to detect a vibration signal of the main shaft 1, and the control unit 3 is configured to control a current applied to each balancing block 4 according to the vibration signal detected by the detection unit 2.

The magnetic particles are small particles with magnetism, and can be magnetic blocks with small volume and good wear resistance or high-magnetization iron particles, and the smaller the volume is, the finer the adjustment of the unbalance amount of the spindle 1 is, and the more accurate the adjustment is. When the power is not supplied, the magnetism of the magnetic particles restricts the movement of the particles mutually, the balance blocks do not show electric property to the outside, the positions of the particles are fixed, the magnetic particles start to move under the action of a magnetic field generated by current after the power is supplied, so that the gravity center of the balance blocks is changed, the purpose of adjusting the gravity center of the balance blocks is achieved, and the balance of the rotation unbalance of the spindle 1 is compensated by adjusting the gravity center of the balance blocks.

The motor rotating shaft dynamic balancing device is characterized in that a balancing unit, a detection unit 2 and a control unit 3 are additionally arranged on a main shaft 1, the detection unit 2 can automatically monitor vibration signals such as vibration amplitude and vibration position of the main shaft, the control unit can receive the vibration signals monitored by the detection unit 2 and convert the vibration signals into inductance signals, and the unbalance amount and the accurate unbalance position of the main shaft 1 are determined according to the converted inductance signals.

Then, the control unit 3 may perform signal conversion and parameter calculation according to the determined amount of unbalance and the accurate position of the unbalance, determine the balance weight 4 to be adjusted and the required control current, correspondingly adjust the corresponding balance weight 4 of the balancing unit according to the calculation result, and output the calculated control current to the corresponding balance weight 4. The control unit 3 is provided with a matching program of current and unbalance, after the unbalance is calculated, the control unit 3 automatically searches the corresponding current in the program, and then controls the current source to deliver the current to the corresponding balance block 4.

The matching procedure of the current and the unbalance is determined by the following method: after the balance ring rotates along with the main shaft 1, the detection unit 2 detects the vibration quantity of the main shaft 1, the control unit 3 calculates the unbalance quantity, the current source starts to output the current from 0 to the maximum value which can be output, meanwhile, the detection unit 2 detects the vibration in real time, and the control unit 3 calculates the unbalance quantity in real time to form a corresponding curve of the current and the compensated unbalance quantity.

The control unit 3 applies control current to the balance weight 4 to be adjusted to excite the magnetic field, and changes the position of magnetic particles in the balance weight 4 to change the gravity center of the balance weight 4, so that the unbalance of the spindle 1 is compensated, the unbalance of the spindle 1 is accurately balanced, the dynamic balance automatic balancing function of the spindle is realized, repeated measurement and correction are not needed, the time cost is saved, and the spindle is prevented from being damaged when the spindle 1 is weighted and removed.

The specification of every balancing piece 4 is unanimous, is convenient for carry out the modularization processing to balancing piece 4 on the one hand, and on the other hand is because the specification of each balancing piece 4 is unanimous, and consequently the required rule of following is unanimous when adjusting balancing piece 4, has reduced the regulation degree of difficulty, is convenient for more moreover to determine required control current, can effectively reduce the control degree of difficulty, improves regulation efficiency.

In one embodiment, at least part of the adjacent balance blocks 4 are arranged at intervals along the circumferential direction of the main shaft 1, in this embodiment, the balance blocks 4 are not closely arranged along the circumferential direction but arranged at intervals, preferably, the balance blocks 4 are uniformly arranged along the circumferential direction, and by adjusting the currents of the balance blocks 4 at different positions, the gravity center adjustment of the balance blocks 4 at different positions can be realized, and further, the rotation unbalance amount of the main shaft 1 can be adjusted.

In this embodiment, the balance blocks 4 are fan-shaped, and the balance blocks 4 are sequentially arranged along the circumferential direction of the main shaft 1 to form a circular balance unit. In this embodiment, the balance blocks 4 have the same specification and are all fan-shaped, and are sequentially adjacent to each other and sequentially arranged along the circumferential direction to form a circular balance unit. In this embodiment, the balancing unit is formed by bonding and fixing 36 balancing blocks 4 by insulating glue to form a balancing ring, magnetic particles are filled in each balancing block 4, and the balance blocks 4 are applied with control current to control the movement of the magnetic particles and adjust the center of the balancing block 4, so as to generate the amount of unbalance to be compensated.

The balance blocks 4 comprise closed fan-shaped annular shells, magnetic particles are filled in the balance blocks 4, adjacent balance blocks 4 are isolated in an insulating mode, current interference cannot occur between the adjacent balance blocks 4, then the inner peripheral wall and the outer peripheral wall of each balance block 4 are connected to the power supply and the control unit 3 through conducting wires to form a control loop, the power supply can be arranged on the spindle 1, an external power supply can also supply power to the balance blocks 4 through the conducting slip rings, a switch for controlling the on-off of the loop where the balance block is located is arranged on each control loop, the control unit 3 controls the on-off of all switches when the rotating shaft dynamic balance adjustment is not needed, when the rotating shaft dynamic balance adjustment is needed, the circuit switches on the corresponding balance blocks 4 are controlled to be closed, a circuit where the balance blocks 4 are located is made to form a passage, and then the positions of the magnetic particles in the balance blocks 4 can be adjusted through, the center of gravity of the balance weight 4 is adjusted. In this embodiment, the power supply can be the dc power supply installed on the main shaft 1, and then realize electrically conductive connection with each balancing piece 4 through the potentiometre, and in the control process, after calculating required control current, can adjust the electric current of carrying to corresponding balancing piece 4 through the potentiometre for the electric current of carrying to corresponding balancing piece 4 is the electric current that calculates, realizes the accurate control to balancing piece 4.

Preferably, each balance block 4 is controlled independently, so that the control of each balance block 4 is more independent and flexible, the number and the position of the balance blocks 4 to be controlled can be selected according to the requirement, and the optimal control mode can be selected to realize the accurate adjustment of the dynamic balance of the motor rotating shaft. Each balance block 4 is independently controlled, after the control unit 3 analyzes and calculates the unbalance amount and the position, the balance blocks 4 at the corresponding positions are electrified, the current value is controlled, the required compensation amount is generated, and the electrified balance blocks 4 can be one or more balance blocks 4 at an angle to jointly generate the compensation amount.

In another embodiment, part of the counterweight 4 forms an independent control loop. For example, two or more balance weights 4 may be connected in parallel to form an independent control circuit, and when controlling the control circuit, the plurality of balance weights 4 located on the control circuit may be simultaneously controlled to synchronously adjust the gravity center positions of the plurality of balance weights 4, thereby realizing the adjustment of the dynamic balance of the motor shaft.

The balance blocks 4 are bonded and fixed through insulating glue, so that the two adjacent balance blocks 4 are in insulating connection.

In other embodiments, a connecting ring for fixing all the balance weights 4 may be provided on the inner peripheral side of the balance weights, the connecting ring is made of an insulating material, all the balance weights 4 are mounted on the connecting ring, and then the connecting ring is mounted and fixed on the main shaft 1, so as to achieve the mounting and fixing of the balance weights 4. This kind of mode can utilize the go-between to realize that the installation of balancing piece 4 on main shaft 1 is fixed, consequently can simplify the structure of balancing piece 4, conveniently realizes that the installation of balancing piece 4 is fixed, can make the mounted position of balancing piece 4 more nimble moreover.

The main shaft 1 is provided with a rotor 5, and two ends of the rotor 5 are respectively provided with a balance unit.

The utility model provides a motor shaft dynamic balance device can be when the motor operation, and signal conversion, parameter calculation are accomplished to the vibration amplitude of automatic monitoring pivot to through the balancing piece circular telegram excitation magnetic field in giving the balancing unit, change the position of magnetic particle in the balancing piece 4 and change the focus of balancing piece, thereby compensate the unbalance amount of rotor, realize the automatic balancing function of pivot dynamic balance.

According to the embodiment of the application, the control method of the motor rotating shaft dynamic balance device comprises the following steps: detecting a vibration signal of the main shaft 1; judging whether the main shaft 1 needs to be dynamically balanced or not according to the vibration signal; if the main shaft 1 needs to be dynamically balanced, the balance unit is adjusted to make up for the unbalance of the main shaft 1; and if the main shaft 1 does not need to carry out dynamic balance, controlling the balance unit to stop working.

When the motor runs, the detection unit 2 can detect the vibration of the rotor 5 on the detected motor spindle 1 and transmits a vibration signal to the control unit 3, the control unit 3 judges whether to perform dynamic balance, and if not, the automatic balancing device is controlled to stop working; if the unbalance is required to be compensated, the unbalance position and the unbalance amount to be compensated are calculated through the vibration signal, the magnitude of the generated current is controlled according to the unbalance amount, the current is transmitted to partial balance blocks 4 on the balance ring according to the unbalance position of the rotor 5 on the main shaft 1, and the energized balance blocks 4 can excite a magnetic field around to attract or repel magnetic particles, so that the gravity center area of the balance ring is changed, and the unbalance amount of the rotor 5 is compensated.

The step of adjusting the balancing unit to compensate the unbalance of the main shaft 1 comprises the following steps: determining the unbalance amount of the main shaft 1 and the position for generating the unbalance amount according to the vibration signal of the main shaft 1; determining the position of the balance weight 4 to be adjusted, the balance weight 4 to be adjusted and the required control current according to the unbalance amount of the main shaft 1 and the position of the unbalance amount; and applying a required control current to the determined balance weight 4 to be adjusted, adjusting the position of the magnetic particles in the balance weight 4 and compensating the unbalance amount of the main shaft 1.

The steps of determining the position of the balance weight 4 to be adjusted, the balance weight 4 to be adjusted and the required control current according to the unbalance amount of the main shaft 1 and the position of generating the unbalance amount include: after the position of the balance weight 4 to be adjusted is determined, determining a single balance weight 4 at the position, and determining whether the balance weight 4 can meet the compensation requirement of the unbalance amount; if the compensation requirement of the unbalance amount can be met, determining the control current required by the unbalance amount compensation; if the compensation requirement of the unbalance amount cannot be met, adding the balance blocks 4 on the two sides of the balance block 4 as balance blocks 4 to be adjusted, and determining whether the compensation requirement of the unbalance amount can be met; and so on. According to the mode, the compensation requirement of the unbalance amount can be met through the least balance blocks, the control is more accurate, the balance blocks 4 corresponding to the positions where the unbalance amount is generated can be used as the reference, the balance blocks 4 in proper quantity are selected to be adjusted, the automatic balancing function is better, and the efficiency is higher.

The steps of determining the position of the balance weight 4 to be adjusted, the balance weight 4 to be adjusted and the required control current according to the unbalance amount of the main shaft 1 and the position of generating the unbalance amount include: after the position of the balance weight 4 to be adjusted is determined, determining the combinations which can be formed by all balance weights 4 in the area where the position is located, and respectively recording the combinations; determining the control current required by each combined balance weight 4 to compensate the unbalance amount; selecting one group from the determined combinations and the corresponding control currents; the combined control current will be selected as the control current needed to compensate for the unbalance. The method can obtain various combinations for adjusting the unbalance amount of the rotating shaft, and then can select the optimal combination through calculation, so that the unbalance amount of the rotating shaft rotor can be adjusted more accurately.

According to an embodiment of the present application, the motor includes a motor shaft dynamic balance device, which is the above-mentioned motor shaft dynamic balance device.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. The utility model provides a motor shaft dynamic balance device, characterized in that, includes main shaft (1), detecting element (2), the control unit (3) and balanced unit, balanced unit sets up on main shaft (1), balanced unit includes two at least balancing pieces (4) of arranging along circumference, each balancing piece (4) intussuseption is filled with magnetic particle, detecting element (2) electric connection to the control unit (3), detecting element (2) are used for detecting the vibration signal of main shaft (1), the control unit (3) are used for according to the vibration signal control that detecting element (2) detected is applyed the electric current to each balancing piece (4).

2. The motor shaft dynamic balancing apparatus according to claim 1, wherein each of the balancing masses (4) has a uniform size.

3. The motor shaft dynamic balancing device according to claim 1, wherein at least some of the adjacent balance blocks (4) are arranged at intervals along the circumference of the main shaft (1); or the balance blocks (4) are in a fan-shaped ring shape, and the balance blocks (4) are sequentially arranged along the circumferential direction of the main shaft (1) to form a ring-shaped balance unit.

4. Motor shaft dynamic balancing apparatus according to claim 1, characterized in that each balancing mass (4) is controlled individually.

5. Motor shaft balancing device according to claim 1, characterized in that the partial balancing masses (4) form an independent control circuit.

6. The motor shaft dynamic balancing device of claim 3, wherein the balance weight (4) is fixed by adhesive bonding with an insulating adhesive.

7. The motor shaft dynamic balancing device according to claim 1, characterized in that a rotor (5) is disposed on the main shaft (1), and the balancing units are disposed at two ends of the rotor (5).

8. An electric machine comprising a motor shaft dynamic balancing apparatus, wherein the motor shaft dynamic balancing apparatus is as claimed in any one of claims 1 to 7.