CN103322045A

CN103322045A - Digital control system with variable modulation mode of magnetic suspension flywheel magnetic bearing

Info

Publication number: CN103322045A
Application number: CN2013102541642A
Authority: CN
Inventors: 韩辅君; 王刚; 丁红; 赵玫
Original assignee: Ludong University
Current assignee: Ludong University
Priority date: 2013-06-25
Filing date: 2013-06-25
Publication date: 2013-09-25

Abstract

The invention discloses a digital control system with a variable modulation mode of a magnetic suspension flywheel magnetic bearing, which can control the magnetic suspension flywheel magnetic bearing. The digital control system mainly comprises a DSP (digital signal processor) system, an FPGA (field programmable gata array) processor system, a PWM (pulse-width modulation) power amplification circuit and a signal conditioning circuit. The DSP processor system obtains signals output from the signal conditioning circuit through an ADC (analog to digital converter) module, and performs operation of a control algorithm according to the signals, operational results are transmitted to the FPGA processor system, and the FPGA processor system performs PWM modulation according to the obtained operational results, and can realize a two-level PWM modulation strategy or a three-level PWM modulation strategy according to requirements.

Description

The magnetic levitation flywheel magnetic bearing numerical control system that a kind of modulation system is variable

Technical field

The invention belongs to the mechanical ﹠ electrical technology field, relate to a kind of bearing control system, specifically, relate to the variable magnetic levitation flywheel magnetic bearing numerical control system of a kind of modulation system.

Background technique

Magnetic bearing is a kind of novel bearing that rotor suspension is got up and be rotated by magnetic force, compare with traditional bearing have contactless, without advantages such as friction, high-speed, highi degree of accuracy, have very strong Research Significance and very wide application space.

At present in magnetic bearing digital control, generally adopt single dsp chip as the scheme of control processor.The advantage of this scheme is that system is simple, and level of integration is high.But for the 5DOF magnetic bearing that adopts full bridge structure, the scheme that adopts single dsp chip to do controller can only realize two level modulation; Realize three level modulation of magnetic bearing, need at least 20 tunnel independence PWM control channels.And general dsp chip is subject to integrated pwm signal port number restriction, can't carry out independent control to 5 magnetic bearing passages.

Summary of the invention

The defectives such as modulation system is single in the magnetic bearings control in the prior art, system is complicated in order to overcome, poor stability have proposed that a kind of hardware design is succinct, control mode is diversified and stable higher magnetic bearing control system.Its technological scheme is as follows:

The magnetic levitation flywheel magnetic bearing numerical control system system that a kind of modulation system is variable, comprise dsp processor system, FPGA processor system, PWM power magnification circuit, signal conditioning circuit, wherein, the dsp processor system is the core of whole control gear, for the treatment of the data that obtain from signal conditioning circuit, generate operation result according to corresponding control algorithm, and send this result to the FPGA processor system by the XINTF interface; The FPGA processor system mainly is the operation result that the dsp processor system transmissions is come to be modulated into the PWM waveform export; The PWM power magnification circuit mainly is to carry out power amplification according to PWM result, and the driving power full-bridge circuit carries out work, and then realizes the control to magnetic bearing; Signal conditioning circuit mainly is that the primary signal of displacement/electric current is nursed one's health into the receptible voltage range of dsp processor internal system ADC module.

Further preferred, described dsp processor system adopts a slice dsp chip as core processor, main be responsible for ADC sampling and control algorithm computing, the exchanges data of XINTF Interface realization and FPGA processor system by DSP, TMS320F2833x is serial in the dsp chip employing.

Further preferred, described FPGA processor system adopts a slice Xilinx chip to generate the PWM waveform, and can carry out as required the pwm signal output under the different modulating strategy.

Further preferred, the PWM power magnification circuit receives the pwm signal from the FPGA processor system, and realize as required transmission and the driving of signal under two level modulation strategies or the three level modulation strategies by the modulation strategy selector switch, high-speed figure isolating chip Si87xx is adopted in the signal isolation, and signal driver adopts high integrated three phase full bridge to drive chip I R2233.

Principle of the present invention is: adopt a slice dsp chip and a slice fpga chip to realize the control of magnetic bearing.Signal conditioning circuit is converted into voltage signal with displacement and the current information of magnetic bearing, and then dsp chip obtains operation result through control algorithm, and send to fpga chip by inner XINTF interface above voltage signal sampling; FPGA modulates according to the data two level modes of carrying out that receive or three level modes are modulated, and outputs to the PWM power magnification circuit; Pwm signal drives the magnetic bearing full-bridge circuit by the digital buffer circuit in the PWM power magnification circuit, pulsed drive protective circuit, generates the required control electric current of magnetic bearing coil, and then the work of control magnetic bearing.

Beneficial effect of the present invention: the present invention has utilized a slice dsp chip and a slice fpga chip to make up magnetic bearing control system, compares with other the system of control, has following characteristics:

(1) adopting dsp processor is core processor, mainly utilize the inner ADC module of DSP to carry out signal sampling, and carry out the computing of control algorithm, adopt XINTF interface and FPGA at a high speed to carry out exchanges data, has level of integrated system high, the advantages such as hardware circuit is simple, fast operation.

(2) employing FPGA processor generates the PWM waveform under the different modulating strategy, and the modulation function implementation procedure is simple, the modulation system flexibility and changeability.

(3) power magnification circuit can adapt to the different modulating strategy by the selection of DSP digital command, adopt digital isolating chip to replace traditional isolation optocoupler chip, adopt three phase full bridge to drive chip and carry out the driving of power signal, have the advantages such as level of integration is high, antijamming capability is strong, isolation effect is good.

Description of drawings

Fig. 1 is structure composition frame chart of the present invention;

Fig. 2 is DSP of the present invention and FPGA interface schema;

Fig. 3 is FPGA fundamental diagram of the present invention;

Fig. 4 is PWM power amplifier signaling interface figure of the present invention;

Fig. 5 is main program flow chart of the present invention;

Fig. 6 is that timer interrupts flow chart among the DSP of the present invention;

Fig. 7 is that ADC interrupts flow chart among the DSP of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments technological scheme of the present invention is described in more detail.

As shown in Figure 1, the present invention includes dsp processor system 3, FPGA processor system 4, PWM power magnification circuit 5 and signal conditioning circuit 2.Wherein dsp processor system 3 is cores of whole control gear, can use TMS320F2833x series with the floating-point operation chip of 12 ADC and XINTF interface, be used for signal conditioning circuit 2 is sampled, and by corresponding control algorithm generation result of calculation, this result is transferred to FPGA processor system 4 by the XINTF interface, FPGA processor system 4 modulation strategy as requested carries out the generation of pwm control signal, and output to PWM power magnification circuit (5), and then control magnetic bearing work.

As shown in Figure 2, dsp processor system 3 carries out exchanges data by XINTF interface and the FPGA processor system 4 of DSP inside, and wherein: D (15:0) is bidirectional data line; A (5:0) is address wire, is used for the DSP sheet external space of FPGA mapping is carried out address choice; NOE is for reading enable signal, Low level effective; NWE is for writing enable signal, Low level effective; XZCS7 is chip selection signal, Low level effective; Clk is CLK clock.When XZCS7 and nOE are low level, can carry out read operation to FPGA; When XZCS7 and nWE are low level, can carry out write operation to FPGA.

As shown in Figure 3, FPGA processor system 4 real-time query bus messages, when corresponding ports detects the XZCS7 port and trailing edge occurs, show that dsp processor system 3 chooses FPGA processor system 4 to carry out exchanges data as sheet external memory space, FPGA judges whether nWE is low level after 1 clock cycle of time-delay, if nWE is low level, then receive the modulation system control word, the row address of going forward side by side decoding, according to the requirement of modulation control mode control word and the different content of address decoding, carry out the modulation of two level PWMs or the three-level pwm modulation of magnetic bearing power amplification system.

As shown in Figure 4, FPGA outputs to the PWM power magnification circuit with the pwm signal that modulates, and signal is converted into the forceful electric power signal through digital isolator spare, and then drives magnetic bearing work.

As shown in Figure 5, the DSP program is at first carried out initialization to inner ADC, XINTF interface and timer after beginning to carry out, and then opens timer interruption and ADC and interrupts, and enters at last Infinite Cyclic, waits for that the DSP timer interrupts arriving.

As shown in Figure 6, in the timer interruption subroutine of DSP, mainly be time opening ADC single conversion, then remove the timer interrupt flag bit, and respond other interruptions.

As shown in Figure 7, in the ADC of DSP interruption subroutine, mainly be to read the ADC sampled result, and it is performed mathematical calculations be converted into pwm control signal, then it is sent to the FPGA processor system by the XINTF interface.

The above; only be the better embodiment of the present invention; protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the simple change of the technological scheme that can obtain apparently or equivalence are replaced and are all fallen within the scope of protection of the present invention.

Claims

1. the variable magnetic levitation flywheel magnetic bearing numerical control system system (1) of a modulation system, it is characterized in that, comprise dsp processor system (3), FPGA processor system (4), PWM power magnification circuit (5), signal conditioning circuit (2), wherein, dsp processor system (3) is the core of whole control gear, for the treatment of the data that obtain from signal conditioning circuit (2), generate operation result according to corresponding control algorithm, and send this result to FPGA processor system (4) by the XINTF interface; FPGA processor system (4) mainly is the operation result that dsp processor system (3) transmission comes to be modulated into the PWM waveform export; PWM power magnification circuit (5) mainly is to carry out power amplification according to PWM result, and the driving power full-bridge circuit carries out work, and then realizes the control to magnetic bearing (6); Signal conditioning circuit (2) mainly is that the primary signal of displacement/electric current is nursed one's health into the receptible voltage range of the inner ADC module of dsp processor system (3).

2. the variable magnetic levitation flywheel magnetic bearing numerical control system of modulation system according to claim 1 system (1), it is characterized in that, described dsp processor system (3) adopts a slice dsp chip as core processor, the main ADC of being responsible for samples and the control algorithm computing, the exchanges data of XINTF Interface realization and FPGA processor system (4) by DSP, dsp chip adopt TMS320F2833x series.

3. the variable magnetic levitation flywheel magnetic bearing numerical control system of modulation system according to claim 1 system (1), it is characterized in that, described FPGA processor system (4) adopts a slice Xilinx chip to generate the PWM waveform, and can carry out as required the pwm signal output under the different modulating strategy.

4. the variable magnetic levitation flywheel magnetic bearing numerical control system of modulation system according to claim 1 system (1), it is characterized in that, PWM power magnification circuit (5) receives the pwm signal from FPGA processor system (4), and realize as required transmission and the driving of signal under two level modulation strategies or the three level modulation strategies by the modulation strategy selector switch, high-speed figure isolating chip Si87xx is adopted in the signal isolation, and signal driver adopts high integrated three phase full bridge to drive chip I R2233.