Programmable digital power supply driving and control method and system for spinning frame electric spindle

Abstract

The invention discloses a programmable digital power supply driving control method and system for an electric spindle of a spinning frame, and relates to a method and system for driving and controlling a single spindle of a spinning frame in a spinning process, in particular to a method and system for driving a programmable digital power supply by adopting a speed-adjustable controller (such as a frequency converter) system to realize digital control on frequency and voltage of an output power supply. The frequency voltage parameter of the power supply is consistent with the frequency voltage parameter of the spinning frame electric spindle, and the power supply can be used as a power supply of the electric spindle to directly drive the whole spinning frame electric spindle to operate synchronously.

Description

Technical Field

[0001] This invention relates to a programmable digital power supply drive and control method and system for spinning machine spindles, specifically a method and system for driving and controlling single spindles in the spinning process. It employs a programmable digital power supply as the power source for the spindles to directly drive the combined single-spindle motor of the entire spinning machine. Background Technology

[0002] In existing spinning systems, the electric spindle drive of spinning machines employs the following three types of technologies:

[0003] One type is the spinning machine spindle based on synchronous motors (including asynchronous starting synchronous motors). This type of spindle has a complex motor structure, large size, low power density, and is difficult to integrate organically with the existing spinning machine spindle mechanism, resulting in high manufacturing costs, such as the spinning machine spindle once developed by a company in Shanghai.

[0004] Secondly, there are spinning machine spindles based on the use of hollow cup-shaped stator windings in the drive motor. These spindles have relatively simple motor structures, high power density and efficiency, and can be closely integrated with the existing spinning machine spindle structures. They are stable, have low cost, and are easy to maintain, such as the spinning machine spindles developed by a company in Shenzhen and Jiangsu.

[0005] The third type is the spinning machine spindle based on a DC brushless motor (including internal rotor and external rotor types). The motor stator (including the housing) is fixed on the spindle feet, and a permanent magnet is installed on the existing spinning machine spindle rod at the position of the spindle belt to make it the motor rotor. The performance of this type of spindle motor is similar to that of the second type.

[0006] All three types of motors mentioned above use permanent magnet rotors and employ dedicated single-spindle independent controllers for drive control, enabling functions such as constant speed control. For centralized control of the spindles in a spinning frame, group controllers, a main controller, and auxiliary modules for power supply, protection, and monitoring are also required. Control of the spindle motors is generally achieved through communication. The main controller of the spinning frame transmits parameters such as operating speed, synchronization signals, and start / stop signals to the group controllers, which then transmit these parameters to the spindle controllers.

[0007] One of the goals of ring spinning machine process control is to increase output while reducing yarn breakage rate. Therefore, intelligent ring spinning machines all adopt multi-segment spindle speed control technology, that is, to control the spindle speed in real time during the spinning process. The same requirement applies to the spinning process of electric spindle ring spinning machines. From the control system of existing electric spindle ring spinning machine prototypes, the spindle speed value is set by communication. The single spindle controller automatically achieves constant speed control. The impact of communication delay on the spinning process can be reduced by increasing the communication baud rate, broadcasting, etc. At the same time, the redundancy range of the spinning process can also compensate for the impact of communication delay. However, the fact that electronic products always have a failure rate cannot be ignored. In particular, the communication interface is also a point that is easily interfered with and damaged. While a failure in the communication interface circuit generally does not have a significant macroscopic impact on the spindle controller's control of the spindle, it can cause abnormal speed of individual spindles at certain points in time. This is actually a potential problem that cannot be ignored and a defect that is difficult to remedy.

[0008] The combination of a master controller, group controllers, and electric ingot controllers is a relatively reasonable and efficient control method in the current technology. However, it also has drawbacks such as multiple control and communication links, incomplete parameter information transmission, multiple motor controllers, and differences in motor controller parameters.

[0009] Currently, the number of spindles in new ring spinning machines is around 1000 to 1800, which is a type of electromechanical equipment with a large number of workstations. Therefore, for electric spindle ring spinning machines, ensuring that the spinning speed of each spindle is consistent and controlling abnormal processes is a crucial technological requirement.

[0010] The electric spindle drive technology for spinning machines in the spinning industry has not yet been industrialized. This is partly due to the influence of other technical and economic factors, and partly because ensuring the consistency of the rotational speed of each spindle position and each time period during the spinning process is a highly specialized and significant technical issue that has a great impact on process quality. It is an industry development direction that requires special attention and in-depth research. Summary of the Invention

[0011] This invention provides a novel programmable digital power supply control method and system for driving spindles in a spinning frame. It adopts a power supply and drive control method that is completely different from the existing spindle group drag technology, fundamentally eliminating the problem of speed difference rate of motors with multiple spindles. Whether operating at constant speed or speed regulation, it can ensure the synchronization of the machine speed of each single spindle motor in each time period, realizing an electric coupling synchronous drive control similar to mechanical synchronous transmission.

[0012] The present invention is implemented as follows:

[0013] A method for powering and controlling the spindles of a spinning machine using a programmable digital power supply includes a method for powering the entire spinning machine spindles with a programmable digital power supply, driving each spindle position with a synchronous motor, and controlling the spindle speed. The programmable digital power supply is a power source that is a frequency converter that drives a synchronous motor. The output shaft torque of the synchronous motor then drives a synchronous generator, and the power output from the synchronous generator drives the synchronous spindle motors of each spindle position.

[0014] A programmable digital power supply drive and control system for spinning machine spindles includes a frequency converter, a synchronous motor, a synchronous generator, a synchronous spindle motor, and a control module. The characteristic is that the frequency converter after the power supply is converted into a frequency power supply drives the synchronous motor, the output shaft torque of the synchronous motor drives the synchronous generator, and the power output of the synchronous generator drives the synchronous spindle motors of each spindle position.

[0015] The synchronous motor output shaft torque drives the synchronous generator, and the motor and generator adopt an integrated structural design.

[0016] The synchronous generator is a multi-frequency generator. The frequency multiplication factor of the generator is designed according to the process requirements range of the spindle speed, the output frequency range of the frequency converter, and the parameters of the electric spindle motor.

[0017] The aforementioned electric spindle motor is a synchronous motor. Its rotor is a ring with embedded permanent magnets combined with the spindle rotating part and supported by spinning spindle bearings. Its stator is a multi-spindle integrated structure, and the multi-spindle integrated stator is fixed on the spinning frame rib.

[0018] The multi-spindle integrated stator structure is integrally formed and stacked from multiple spindles of stator silicon steel sheets, with stator windings embedded in individual spindles, and the integrated stator structure is fixed on the spinning frame rib.

[0019] The multi-spindle integrated stator structure is described above, in which the spindle foot fixing part is integrated with the integrated stator structure for positioning and fixing.

[0020] The drive control method and system employing the above-mentioned programmable digital power supply for spinning machine spindles utilizes AC synchronous motors throughout the entire power supply system. The frequency of the variable frequency power output from the inverter determines the speed and synchronization of the entire spinning machine's spindle motors. The mechanical connection between the synchronous motor and the synchronous generator isolates harmful harmonics and other unstable factors from the power supply and inverter. The AC permanent magnet generator supplies the AC permanent magnet spindle motors with a stable, clean, harmonic-free sinusoidal power supply. The AC permanent magnet generator outputs a harmonic-free sinusoidal power supply, eliminating the communication commands and data processing between the machine's central controller and intermediate spindle controllers. It essentially supplies power directly to each spindle position in parallel. This allows the AC synchronous spindle motors in the numerous positions of the spinning machine to operate in an environment with good machine-wide AC power frequency consistency, stable and distortion-free power frequency and voltage, and no need for individual spindle controllers or communication functions. This provides a fundamental technical guarantee for wide-range variable frequency speed regulation, highly consistent spindle speeds, harmonic-free energy-saving operation, and lower investment and management costs for the spinning machine. Attached Figure Description

[0021] Appendix Figure 1 This is a schematic diagram of an embodiment of the programmable digital power supply drive control method and system for spinning machine spindles of the present invention.

[0022] Appendix Figure 2 This is a schematic diagram of an embodiment of the programmable digital power supply drive control method and system for spinning machine spindles of the present invention.

[0023] Appendix Figure 3 This is a schematic diagram of an embodiment of the integrated structure of synchronous motor and synchronous generator in the programmable digital power supply drive control system for spinning machine spindles of the present invention.

[0024] Appendix Figure 4 This is a schematic diagram of the integrated structure of the synchronous spindle motor rotor and spindle in the programmable digital power supply drive control system for the spinning machine spindle of the present invention.

[0025] Appendix Figure 5 This is a schematic diagram of the composite silicon steel sheet structure of the nine spindle positions of the synchronous spindle motor stator of the programmable digital power supply drive control system for the spinning machine spindle of the present invention.

[0026] Appendix Figure 6 This is a schematic diagram of the installation of the synchronous spindle motor in the programmable digital power supply drive control system for the spinning machine spindle of the present invention. Detailed Implementation

[0027] The method for programmable digital power supply and drive control of spinning machine spindles is described in the appendix. Figure 1This includes the power supply for the entire spinning machine's spindles, the synchronous motor drive for each spindle, and the spindle speed control method. The power supply is a variable frequency power supply after the power supply is converted by a frequency converter to drive the synchronous motor. The output shaft torque of the synchronous motor drives the synchronous generator, and the power output of the synchronous generator drives the synchronous spindle motor of each spindle.

[0028] Programmable digital power supply drive and control system for spinning machine spindles, see attached document. Figures 2-6 It includes a frequency converter, a synchronous motor, a synchronous generator, a synchronous electric spindle motor, and a control module. The power supply is converted into a frequency converter to drive the synchronous motor. The output shaft torque of the synchronous motor drives the synchronous generator. The power output of the synchronous generator drives the synchronous electric spindle motors at each spindle position.

[0029] The synchronous motor output shaft torque drives the synchronous generator, and the synchronous motor and synchronous generator adopt an integrated structural design.

[0030] The synchronous motor output shaft torque drives the synchronous generator, and the synchronous motor and synchronous generator shafts adopt a coaxial structure or a mechanical direct drive connection.

[0031] The synchronous generator is a multi-frequency generator. The frequency multiplication factor of the generator is designed according to the process requirements range of the spindle speed, the output frequency range of the frequency converter, and the parameters of the electric spindle motor.

[0032] The aforementioned electric spindle motor is a synchronous motor. Its rotor is a ring inlaid with permanent magnets that is combined with the spindle's rotating part and supported by bearings in the spindle feet and spindle core, without altering the basic structure of the original spinning spindle. Its stator is a multi-spindle integrated structure, which is fixed to the spinning frame's rigging.

[0033] The multi-spindle integrated stator structure is integrally formed and stacked from multiple spindles of stator silicon steel sheets, with stator windings embedded in individual spindles, and the integrated stator structure is fixed on the spinning frame rib.

[0034] In the aforementioned multi-spindle integrated stator structure, the fixed part of the spindle feet is integrated with the integrated stator structure for positioning and fixation.

[0035] Compared with the prior art, the above-mentioned programmable digital power supply drive control method and system for spinning machine spindles has the following advantages: 1) Since the entire power supply system uses AC synchronous motors, the frequency of the variable frequency power output by the frequency converter determines the speed and synchronization of the entire spinning machine spindle motor.

[0036] 2) The mechanical connection between the synchronous motor and the synchronous generator isolates the unstable factors such as harmful harmonics brought by the power supply and frequency converter. The AC permanent magnet generator supplies the AC permanent magnet motor with a stable, clean, and harmonic-free sine wave power supply.

[0037] 3) The AC permanent magnet generator outputs harmonic-free sinusoidal power, eliminating the communication commands and data processing between the central controller of the machine and the intermediate single-spindle controller. This is equivalent to directly supplying power to each spindle position of the whole machine in parallel, ensuring that the electric motors of each spindle position receive undifferentiated power supply.

[0038] 4) In this way, the electric spindle motors in the many stations of the entire spinning machine operate under favorable conditions such as good consistency of AC power frequency across the machine, stable power frequency and voltage without distortion, and no need for individual spindle controllers and communication functions. This provides a basic technical guarantee for wide-range frequency conversion speed regulation, high consistency of spindle speed across the entire machine, harmonic-free energy-saving operation, and lower investment and management costs.

[0039] Therefore, this invention effectively solves the problem of synchronizing the rotational speeds of multiple electric spindles in a ring spinning machine, providing a cost-effective electric spindle power supply and drive control technology solution for the industrial application of new electric spindle ring spinning machines.

Claims

1. A novel programmable digital power supply control method and system for driving spindles in a spinning frame. This method adopts a power supply drive control mode that is completely different from the existing spindle group drag technology, fundamentally eliminating the problem of speed difference rate of motors with multiple spindle positions. Whether operating at constant speed or speed regulation, it can ensure the synchronization of the machine speed of each single spindle motor in each time period, realizing an electric coupling synchronous drive control similar to mechanical synchronous transmission.

2. The programmable digital power supply drive and control method for spinning machine spindles as described in claim 1, characterized in that: The programmable digital power supply is a power source that uses a frequency converter to drive a synchronous motor, and then the output shaft torque of the synchronous motor drives a synchronous generator.

3. The programmable digital power supply drive and control system for spinning machine spindles as described in claim 1, characterized in that: Programmable digital power supplies drive synchronous electric spindle motors at each spindle position.

4. The synchronous generator driven by the output shaft torque of the synchronous motor as described in claim 2, characterized in that: The electric motor and generator are designed as an integrated structure.

5. The synchronous generator as described in claims 2, 3, and 4 employs a multi-frequency generator, characterized in that: The frequency multiplication factor of the generator is designed based on the process requirements range of the spindle speed, the output frequency range of the frequency converter, and the parameters of the electric spindle motor.

6. The electric ingot motor as described in claim 5 is a synchronous motor, characterized in that: The rotor is a ring inlaid with permanent magnets combined with the spindle rotating part and supported by the spinning spindle bearing. The stator is a multi-spindle integrated structure, and the multi-spindle integrated stator is fixed on the spinning frame rib.

7. The multi-spindle integrated stator structure as described in claim 6, characterized in that: The stator is integrally formed and stacked with multiple spindles of silicon steel sheets, and the stator winding is embedded in a single spindle. The combined stator structure is fixed on the spinning machine rib.

8. The multi-spindle integrated stator structure as described in claim 7, characterized in that: The spindle foot fixing part is integrated with the combined stator structure for positioning and fixation.

9. The drive control method and system for programmable digital power supply of spinning machine spindles as described in claim 1, characterized in that: Because the entire power supply system uses AC synchronous motors, the frequency of the variable frequency power output from the frequency converter determines the speed and synchronization of the spindle motors in the entire spinning frame. The mechanical connection between the synchronous motor and the synchronous generator isolates the power supply from harmful harmonics and other unstable factors introduced by the frequency converter. The AC permanent magnet generator supplies the AC permanent magnet spindle motors with a stable, clean, harmonic-free sine wave power supply. The AC permanent magnet generator outputs a harmonic-free sine wave power supply, eliminating the communication commands and data processing between the central controller and intermediate spindle controllers. It essentially supplies power directly to each spindle position in parallel. This allows the AC synchronous spindle motors in the numerous positions of the spinning frame to operate in an environment with good consistency in AC power frequency across the entire frame, stable and distortion-free power frequency and voltage, and no need for individual spindle controllers or communication functions. This provides a fundamental technical guarantee for wide-range variable frequency speed regulation, highly consistent spindle speeds across the entire frame, harmonic-free energy-saving operation, and lower investment and management costs.

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