CN216959709U

CN216959709U - Based on permanent-magnet machine formula centrifugal machine controlling means

Info

Publication number: CN216959709U
Application number: CN202220214172.9U
Authority: CN
Inventors: 徐鹏; 王亮亮; 唐茂强
Original assignee: Jiangsu Tangchen Machinery Manufacturing Co ltd
Current assignee: Jiangsu Tangchen Machinery Manufacturing Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-07-12
Anticipated expiration: 2032-01-26

Abstract

The utility model discloses a control device of a centrifugal machine based on a permanent magnet motor, which comprises a single permanent magnet motor, a rectifier, an inverter and an AFE active front end: the direct current output side of the AFE active front end is connected with the positive electrode and the negative electrode of a direct current power supply, the wire inlet end of the AFE active front end is connected with a buffer resistor and a PFC inductor which are connected in series, two ends of the buffer resistor are also connected with an alternating current contactor in parallel, the PFC inductor is connected with one end of a filter inductor through a filter capacitor, and the other end of the filter inductor is connected with a secondary winding of a power transformer; the rectifier is connected between the positive electrode and the negative electrode of the direct current power supply; and the single permanent magnet motor is connected between the positive pole and the negative pole of the direct current power supply through the inverter. The method can be used for transforming a centrifuge control system, is quick in construction time, low in construction difficulty and transformation cost, has perfect protection measures in the system, can reduce the deceleration time of a motor, improves the working efficiency, and is particularly suitable for a tubular pile centrifuge control system.

Description

Based on permanent-magnet machine formula centrifugal machine controlling means

Technical Field

The utility model relates to a control device based on a permanent magnet motor type centrifugal machine.

Background

The production process of directly carrying the motor on the frequency converter to control the centrifuge is widely applied to the field of pipe piles, but the production process has the problems of slow speed reduction, high energy consumption, difficulty in adjusting the pipe piles and the like, and is not suitable for the current production requirements of reducing energy consumption and improving productivity, so that the energy-saving scheme of the centrifuge becomes a hotspot direction for research and development of equipment matched with the pipe piles. In recent years, related researchers have vigorously developed energy-saving centrifuge devices, a series of research achievements have been obtained, and part of products are vigorously popularized and applied in the tubular pile. However, although the energy-saving centrifuge equipment on the market has good use effect, the energy-saving effect still has room for improvement.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the utility model provides a control device of a centrifuge based on a permanent magnet motor, which can be used for modifying a centrifuge control system, has the advantages of quick construction time, low construction difficulty, low modification cost, perfect protection measures in the system, reduction of the deceleration time of the motor and improvement of the working efficiency, and is particularly suitable for a tubular pile centrifuge control system.

In order to achieve the technical purpose and achieve the technical effect, the utility model is realized by the following technical scheme:

a control device based on a permanent magnet motor type centrifugal machine comprises a single permanent magnet motor, a rectifier, an inverter and an AFE active front end:

the direct current output side of the AFE active front end is connected between the positive electrode and the negative electrode of a direct current power supply, the power supply inlet end of the AFE active front end is connected with a buffer resistor and a PFC inductor which are connected in series, two ends of the buffer resistor are also connected with an alternating current contactor in parallel, the PFC inductor is connected with one end of a filter inductor through a filter capacitor, and the other end of the filter inductor is connected with a secondary winding of a power transformer;

the rectifier is connected between the positive electrode and the negative electrode of the direct current power supply;

and the single permanent magnet motor is connected between the positive pole and the negative pole of the direct current power supply through the inverter.

Preferably, the model of the rectifier is MD810-20M4T110G 000.

Preferably, the inverter is in a model number of MD810-50M4T110G 530.

Preferably, fuses are respectively connected in series between the active front end of the AFE and the positive and negative poles of the dc power supply.

Preferably, the permanent magnet motor is a permanent magnet synchronous motor.

A control device based on a permanent magnet motor type centrifugal machine comprises a rectifier, an inverter, an AFE active front end and Y permanent magnet motors, wherein Y is more than or equal to 2:

the direct current output side of the AFE active front end is connected between the positive pole and the negative pole of the common direct current bus, the power supply inlet end of the AFE active front end is connected with a buffer resistor and a PFC inductor which are connected in series, two ends of the buffer resistor are also connected with an alternating current contactor in parallel, the PFC inductor is connected with one end of a filter inductor through a filter capacitor, and the other end of the filter inductor is connected with a secondary winding of a power transformer;

the rectifier is connected between the positive electrode and the negative electrode of the common direct current bus;

and the Y permanent magnet motors are respectively connected between the positive pole and the negative pole of the common direct current bus through inverters.

Preferably, the model of the rectifier is MD810-20M4T355G, and the model of the inverter is MD810-50M4T 110G.

Preferably, the permanent magnet motor is a permanent magnet synchronous motor.

Preferably, Y is 3.

The utility model has the beneficial effects that:

the control device based on the permanent magnet motor type centrifugal machine has the advantages of high level of substitution, low noise, strong overload capacity, long service life of a bearing and the like. The device can be singly or many reform transform centrifuge control system, and the engineering time is fast, and the construction degree of difficulty is low, and the transformation expense is low, and the measure of protection is perfect in the system, can reduce the deceleration time of motor, improves work efficiency, specially adapted tubular pile centrifuge control system.

Drawings

FIG. 1 is a schematic structural diagram of a centrifugal machine control device based on a single permanent magnet motor according to the present invention;

FIG. 2 is a schematic structural diagram of a control device of a centrifuge based on three permanent magnet motors according to the present invention;

the reference numerals of the drawings have the following meanings:

1: a filter inductor; 2: a filter capacitor; 3: a PFC inductor; 4: a buffer resistor; 5: an AFE active front end; 6: a fuse; 7: a rectifier; 8: an inverter; 9: an AC contactor; 10: a permanent magnet synchronous motor; n: a neutral line representing a secondary of the power transformer; l1, L2 and L3 respectively represent the phase lines of the secondary three windings of the power transformer; KMO: a coil of an AC contactor.

Detailed Description

The present invention will be better understood and implemented by those skilled in the art by the following detailed description of the technical solution of the present invention with reference to the accompanying drawings and specific examples, which are not intended to limit the present invention.

When only a single permanent magnet motor is provided, as shown in fig. 1, a centrifugal machine control device based on a permanent magnet motor comprises the single permanent magnet motor, a rectifier 7, an inverter 8 and an AFE Active front end 5, wherein the AFE Active front end 5 is also called a rectification feedback device, and the english name thereof is translated from "Active FrontEnd". The AFE active front end 5 is the same as the output inversion part of the frequency converter, and also adopts an IGBT to form a three-phase bridge structure, so that the bidirectional flow of energy between the power grid and the direct-current bus of the frequency converter is realized, wherein the phase sequence protection function is realized in the AFE controller, and the AFE active front end can maintain the power factor and maintain the waveform of feedback electric energy.

The direct current output side (DC +, DC-) of the AFE active front end 5 is connected between the positive electrode and the negative electrode of a direct current power supply, the power supply incoming line end (L1, L2, L3) of the AFE active front end 5 is connected with a buffer resistor 4 and a PFC inductor 3 which are connected in series, the two ends of the buffer resistor 4 are also connected with an alternating current contactor 9 in parallel, the alternating current contactor 9 is connected with the buffer resistor 4 in parallel for protecting a circuit, the PFC inductor 3 is connected with one end of a filter inductor 1 through a filter capacitor 2, and the other end of the filter inductor 1 is connected with a secondary winding of a power transformer.

The rectifier 7 is connected between the positive pole and the negative pole of the direct-current power supply, and the single permanent magnet motor is connected between the positive pole and the negative pole of the direct-current power supply through the inverter 8.

In fig. 1, preferably, the permanent magnet motor is a permanent magnet synchronous motor 10, the energy efficiency of the permanent magnet motor can reach GB1, and the power factor approaches 1. The mode of permanent-magnet machine collocation rectifier 7 can improve braking effect, reduces the system power consumption, reduces the transformation expense, reduces the construction degree of difficulty when transforming. The permanent magnet motor, together with the AFE active front end and the rectifier 7, can feed back the electric energy generated by the motor during braking to the main power grid to further optimize the energy-saving effect.

Preferably, the model of the rectifier 7 is MD810-20M4T110G000, and the model of the inverter 8 is MD810-50M4T110G 530. Preferably, a fuse 6 (FU in fig. 1) is connected in series between the AFE active front end 5 and the positive electrode and the negative electrode of the dc power supply, respectively.

The AFE active front end 5 is directly connected with the MD810 rectifying unit and is simultaneously connected with an MD810 inverting unit, a permanent magnet motor is connected to the lower end of the inverting unit, wherein a controllable rectifying module of the AFE and an inverting module of a rectifier are connected into a back-to-back structure, the AFE is connected with a three-phase power grid, the three-phase input end of the rectifier is suspended, the current phase of the input end of the AFE is the same as or opposite to the power grid (determined according to the state of a rear-stage rectifier), the absolute value of a power factor is always kept to be approximate to 1, and the waveform is close to a sine wave, so that the energy-saving and efficiency-increasing effects are realized. The permanent magnet motor is matched with the rectifier, so that direct transformation on original equipment can be realized, and the permanent magnet motor has the characteristics of cost saving, maintenance of an operation system of the original equipment and short transformation time.

The AFE active front end can feed back the electric energy generated by the motor during braking to the power grid, so that the energy-saving effect is deepened, and compared with the prior art, the utility model has the following beneficial effects:

1) the permanent magnet motor replaces a traditional three-phase asynchronous motor, so that the energy efficiency is high, the noise is low, and the reliability is improved.

2) The control system of the original equipment is kept, the modification cost is low, the modification time is short, and the effect is quick.

3) The AFE active front end can feed back electric energy generated when the motor brakes.

When there are multiple permanent magnet motors, as shown in fig. 2, a centrifuge control device based on permanent magnet motors includes a rectifier 7, an inverter 8, an AFE active front end 5, and Y permanent magnet motors, where Y is greater than or equal to 2:

the direct current output side (DC +, DC-) of the AFE active front end 5 is connected between the positive electrode and the negative electrode of a common direct current bus, the power supply inlet end (L1, L2, L3) of the AFE active front end 5 is connected with a buffer resistor 4 and a PFC inductor 3 which are connected in series, two ends of the buffer resistor 4 are also connected with an alternating current contactor 9 in parallel, the PFC inductor 3 is connected with one end of a filter inductor 1 through a filter capacitor 2, and the other end of the filter inductor 1 is connected with a secondary winding of a power transformer.

The rectifier 7 is connected between the positive and negative poles of the common direct current bus. And the Y permanent magnet motors are respectively connected between the positive pole and the negative pole of the common direct current bus through the inverter 8. In fig. 2, 3 permanent magnet synchronous motors 10 are connected in parallel between the positive and negative poles of the common dc bus. The energy efficiency of the permanent magnet motor can reach GB1, and the power factor is close to 1. The braking effect can be improved and the system energy consumption can be reduced by the mode that the permanent magnet motor is matched with the rectifier to share the bus. After the permanent magnet motor is matched with the AFE active front end and the rectifier to share a bus, the electric energy generated by the motor during braking can be fed back to the main power grid to optimize the energy-saving effect.

Correspondingly, preferably, the model of the rectifier 7 is MD810-20M4T355G, the model of the inverter 8 is MD810-50M4T110G, and fuses 6 are respectively connected in series between the AFE active front end 5 and the positive and negative poles of the dc power supply.

The MD810 multi-motor driver (the MD810 multi-motor driver comprises an MD810-20M4T355G rectifier and a plurality of MD810-50M4T110G inverters which jointly form the MD810 frequency converter capable of controlling more than one), can realize unified control of a plurality of groups of centrifuges (the control principle is the same as that of a single permanent magnet motor), saves space, and can improve the operation efficiency of a system by a bus-shared wiring mode. In the operation process, a plurality of centrifuges can be controlled to act simultaneously and respectively; when the motor is stopped, the AFE active front end can feed back electric energy generated when the motor is braked to the power grid, and the energy-saving effect is deepened.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A control device based on a permanent magnet motor type centrifuge is characterized by comprising a single permanent magnet motor, a rectifier (7), an inverter (8) and an AFE active front end (5):

the direct current output side of the AFE active front end (5) is connected between the positive electrode and the negative electrode of a direct current power supply, the power supply inlet end of the AFE active front end (5) is connected with a buffer resistor (4) and a PFC inductor (3) which are connected in series, two ends of the buffer resistor (4) are also connected with an alternating current contactor (9) in parallel, the PFC inductor (3) is connected with one end of a filter inductor (1) through a filter capacitor (2), and the other end of the filter inductor (1) is connected with a secondary winding of a power transformer;

the rectifier (7) is connected between the positive electrode and the negative electrode of the direct-current power supply;

and the single permanent magnet motor is connected between the positive pole and the negative pole of the direct current power supply through an inverter (8).

2. The control device of the permanent magnet motor-based centrifuge as claimed in claim 1, wherein the rectifier (7) is model number MD810-20M4T110G 000.

3. The permanent magnet motor-based centrifugal machine control device according to claim 1, wherein the inverter (8) is of a type MD810-50M4T110G 530.

4. The control device of the permanent magnet motor-based centrifuge according to claim 1, wherein a fuse (6) is connected in series between the AFE active front end (5) and the positive and negative poles of the dc power supply.

5. The control device of the permanent magnet motor-based centrifuge according to claim 1, wherein the permanent magnet motor is a permanent magnet synchronous motor (10).

6. The utility model provides a based on permanent-magnet machine formula centrifugal separator controlling means which characterized in that, includes rectifier (7), dc-to-ac converter (8), AFE active front end (5) and Y permanent-magnet machine, and Y is greater than or equal to 2:

the direct current output side of the AFE active front end (5) is connected between the positive electrode and the negative electrode of a common direct current bus, the power supply inlet end of the AFE active front end (5) is connected with a buffer resistor (4) and a PFC inductor (3) which are connected in series, two ends of the buffer resistor (4) are also connected with an alternating current contactor (9) in parallel, the PFC inductor (3) is connected with one end of a filter inductor (1) through a filter capacitor (2), and the other end of the filter inductor (1) is connected with a secondary winding of a power transformer;

the rectifier (7) is connected between the positive electrode and the negative electrode of the common direct current bus;

and the Y permanent magnet motors are respectively connected between the positive pole and the negative pole of the common direct current bus through an inverter (8).

7. The PM-based centrifugal machine control device of claim 6, wherein the rectifier (7) is model MD810-20M4T355G, and the inverter (8) is model MD810-50M4T 110G.

8. The control device of the permanent magnet motor-based centrifuge according to claim 6, wherein a fuse (6) is connected in series between the AFE active front end (5) and the positive and negative poles of the DC power supply.

9. The control device of the centrifuge based on the permanent magnet motor type according to claim 6, characterized in that the permanent magnet motor is a permanent magnet synchronous motor (10).

10. The control device of claim 7, wherein Y is 3.