CN105738807A - High-speed dynamic pressure gyro motor ground touch rotating speed test system - Google Patents
High-speed dynamic pressure gyro motor ground touch rotating speed test system Download PDFInfo
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- CN105738807A CN105738807A CN201610080920.8A CN201610080920A CN105738807A CN 105738807 A CN105738807 A CN 105738807A CN 201610080920 A CN201610080920 A CN 201610080920A CN 105738807 A CN105738807 A CN 105738807A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
Abstract
The present invention relates to a high-speed dynamic pressure gyro motor ground touch rotating speed test system, and relates to the motor test field. The high-speed dynamic pressure gyro motor ground touch rotating speed test system comprises a motor control unit, a sensor unit, a high-speed data acquisition unit, a central processing unit, a voltage comparison unit, a signal conditioning unit, a communication unit, an upper computer data analyzing and resolving unit, a test result displaying and storing unit, etc., can measure the ground touch rotating speed of a motor and detect the characteristic of a dynamic pressure gas bearing accurately, and can further obtain the state characteristic indexes of a dynamic pressure bearing. The system of the present invention adopts a counter electromotive force measurement method, can measure the characteristic parameters of the motor under the states, such as a floater, a gyro instrument, an inertial platform, etc., and enables the problem that after being assembled, the gyro motor only can measure the current and the voltage, but can not measure other characteristic parameters to be solved effectively. The measurement system can evaluate the operation state of the gyro motor real-timely, and has very important actual engineering significance for enhancing the reliability of a gyro instrument product and improving the quality and precision of a dynamic pressure motor product.
Description
Technical field
The present invention relates to a kind of electromechanical testing field, particularly a kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system.
Background technology
Hydrodynamic gas bearing gyro motor is a kind of motor that runs up being supporting construction with kinetic pressure air-float bearing of inner, due to this motor possess long-life, ultralow vibration, low noise, the feature such as anti-overload ability is strong, the fluctuation of speed is little, be applied on gyroscope instrument and inertial platform.The measuring method of current hydrodynamic gas bearing gyro motor characterisitic parameter is at motor status, coordinates reaction moment tester to measure its mechanical property by energy meter.But after dynamic pressure motor loads gyroscope instrument or is installed on inertial platform, the quality of motor body and hydrodynamic bearing is indirectly judged only by the voltage and current gathering gyro machine, and the most key air-bearing moment parameter of motor can not be measured, cause that air-bearing is not formed direct quantitative evaluation from after loading instrument, platform to final bullet use by gyro machine.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, a kind of high speed dynamic pressure gyro machine is provided to contact to earth rotary speed test system, for high-speed permanent magnetic, magnetic hysteresis dynamic pressure electromechanical testing, solve gyro machine from loading after instrument, platform to final bullet use, it is impossible to the problem that air-bearing state is carried out quantitative evaluation.
The above-mentioned purpose of the present invention is achieved by following technical solution:
A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system, shows and memory element including motor control unit, voltage sensor unit, three-phase voltage collecting unit, voltage comparison unit, signal condition unit, filter unit, high-speed data acquisition unit, CPU, communication unit, host computer data analysis solving unit, test result；
Motor control unit: receive the control signal that transmits of CPU, control outside gyro machine startup and stopping；
Voltage sensor unit: outside gyro machine three phase back-emf after a loss of power of test, generates three-phase voltage signal, is transferred to three-phase voltage collecting unit；
Three-phase voltage collecting unit: gather the three-phase voltage signal that voltage sensor unit transmits, and three-phase voltage signal is transferred to voltage comparison unit；
Voltage comparison unit: receive the three-phase voltage signal that three-phase voltage collecting unit transmits, and three-phase voltage signal is compared with normal voltage；When voltage magnitude is more than 12V, by three-phase voltage signal output to signal condition unit；When voltage magnitude is 1.25V-12V, by three-phase voltage signal output to signal condition unit；When voltage magnitude is 0-1.25V, three-phase voltage signal is transferred to filter unit；
Signal condition unit: the voltage magnitude that reception voltage comparison unit the transmits three-phase voltage signal more than 12V, and carry out blood pressure lowering process, adjust in 1.25V-12V, and carry out square wave conversion generation three-phase standard block voltage signal, transmit to filter unit；Receive the three-phase voltage signal that voltage magnitude is 1.25V-12V that voltage comparison unit transmits, and carry out square wave conversion generation three-phase standard block voltage signal, transmit to filter unit；Three-phase voltage signal after the boosting that the unit that accepts filter transmits, and three-phase voltage signal is carried out square wave conversion, it is transformed into three-phase standard block voltage signal, by three-phase standard block voltage signal transmission to filter unit；
Filter unit: receive the 0-1.25V three-phase voltage signal that voltage comparison unit transmits, is filtered and after boosting process, adjusts in 1.25V-12V, by the three-phase voltage signal output after boosting to signal condition unit；The receiving signal reason three-phase standard block voltage signal that transmits of unit, directly exports three-phase standard block voltage signal to high speed data acquisition unit；Or it is transferred to high-speed data acquisition unit after three-phase standard block voltage signal is generated three-phase synchronous square wave voltage signal；
High-speed data acquisition unit: three-phase standard block voltage signal that the unit that accepts filter transmits or three-phase synchronous square wave voltage signal；And just counting 1 time of a zero crossing is often run into according to square wave voltage signal, and calculate count results j=1,2,3 ... q, q are positive integer, and count results is transferred to CPU；
CPU: first sending gyro machine enabling signal to motor control unit, after the outside gyro machine of motor control unit control reaches synchronous rotational speed, CPU sends power down control signal, and power down control signal is transferred to motor control unit；And synchronize to receive the count results that high-speed data acquisition unit transmits, store, and calculate counter electromotive force half period Tj；Tj is the intrinsic triggered time that count results is multiplied by enumerator crystal oscillator, and through communication unit, count results and counter electromotive force half period Tj are transferred to host computer data analysis solving unit；
Communication unit: receive count results and counter electromotive force half period T that CPU transmitsj, and by count results and counter electromotive force half period TjTransmit to host computer data analysis solving unit；
Host computer data analysis solving unit: count results that receiving communication unit transmits and counter electromotive force half period Tj；Calculating obtains inertial rundown time, contact time, contact to earth rotating speed and moment of resistance parameter of contacting to earth；And by inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance of contacting to earth transmission show and memory element to test result；
Test result shows and memory element: receives host computer data and resolves inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance of contacting to earth that analytic unit transmits；Real-time rotating speed is made real time value in test process and is shown and store；The moment of resistance, contact time, the rotating speed that contacts to earth, the moment of resistance of the contacting to earth parameter of contacting to earth terminates in test, is shown in test result interface.
Contact to earth rotary speed test system at above-mentioned a kind of high speed dynamic pressure gyro machine, in described filter unit, when three-phase standard block voltage signal magnitude is not within the scope of the filtering voltage set, three-phase standard block voltage signal is directly output to high-speed data acquisition unit by filter unit；When three-phase standard block voltage signal magnitude is within the scope of filtering voltage, three-phase standard block voltage signal is filtered by filter unit and differential amplification processes, voltage magnitude three-phase standard block voltage signal in predetermined voltage range is carried out noise filtering, voltage magnitude amplifies 10 times, frequency keeps synchronizing, generate three-phase synchronous square wave voltage signal, three-phase synchronous square wave voltage signal is transferred to high-speed data acquisition unit.
Contacting to earth rotary speed test system at above-mentioned a kind of high speed dynamic pressure gyro machine, the filtering voltage of setting ranges for-1～+1v；Predetermined voltage range is :-1.25V～+1.25V.
Contact to earth rotary speed test system at above-mentioned a kind of high speed dynamic pressure gyro machine, inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance calculation method of parameters that contacts to earth as follows:
Inertial rundown time T:
Wherein, TjIt is powered down to rotor stalling counter electromotive force half period T for motorj, unit is s；Q is all number of semi-periods of oscillations of three-phase back-emf signal that motor is powered down to rotor stalling, i.e. count results；
The changing value Δ T of adjacent half period in power-off coasting processjFor:
ΔTj=Tj-Tj-1, j=1,2,3 ... q, unit s；
Contact time Tc: the time contacted to earth down to outside gyro machine from outside gyro machine, wherein c is the moment voltage half cycle issue that contacts to earth, and c is positive integer, it is assumed that as q=c, it is determined that contact to earth for gyro machine；
The rotating speed that contacts to earth judges: the changing value Δ T of adjacent half periodcMore than experience setting value δ, need to can obtain the value of c；
ΔTc=| Tc-Tc-1| > δ, unit s；
Real-time rotating speed n:
N=60/p (Tj+Tj-1), unit rpm；
Contact to earth rotating speed nc:
nc=60/p (Tc+Tc-1), unit rpm；
Fluctuation of speed △ ωj:
ωj=π/Tj；Δωj=π/Tj-π/Tj-1
Wherein, p is motor number of pole-pairs；
ωjFor motor angular velocity of rotation, unit is rad/s；
△ωjFor angular velocity of rotation variable quantity, unit is rad/s；
Rotational resistance square M: for moment of resistance summation suffered in outside gyro machine stalling after a loss of power；
Contact to earth moment of resistance Mc: for TcContact to earth the rotational resistance square in moment；
Wherein, J is outside gyro machine rotor moment of inertia；△ωcFor the moment gyro machine angular velocity of rotation variable quantity that contacts to earth, unit is rad/s.
Contact to earth rotary speed test system at above-mentioned a kind of high speed dynamic pressure gyro machine, in described signal condition unit, by programmable gain instrument amplifier and fully differential funnel droop amplifier cascade, high differential input impedance and-110dB total harmonic distortion are provided, in the tested effective range of back-emf signal range-adjusting to-12～+12V, counter electromotive force three-phase sine-wave signal will be converted to square-wave signal simultaneously.
Contacting to earth rotary speed test system at above-mentioned a kind of high speed dynamic pressure gyro machine, described filter unit is frequency overlapped-resistable filter.
The present invention compared with prior art has the advantage that
(1) present invention employs employing counter electromotive force measurement method, from three-phase back-emf signal, extract effective semiperiodic signal TjAchieve outside gyro machine to include contacting to earth under the states such as float, gyroscope instrument, inertial platform the measurement of the moment of resistance, contact time, the characterisitic parameter such as rotating speed, inertial rundown time that contacts to earth, efficiently solve gyro machine from the problem to final bullet use, air-bearing not being formed direct quantitative estimation method after loading instrument, platform；
(2) present invention employs host computer data analysis solving unit, pass through formula Achieve the measurement of gyro machine inertial rundown time under different conditions；By formula Δ Tc=| Tc-Tc-1| > δ, as the changing value Δ T of adjacent half periodcDuring more than experience setting value δ, it is achieved that the measurement of the gyro machine rotating speed that contacts to earth under different conditions；By formula n=60/p (Tj+Tj-1), it is achieved that the measurement of the gyro machine real-time rotating speed under different conditions；Pass through formulaAchieve the experiment curv in gyro machine rotational resistance square M stalling after a loss of power；
(3) in the present invention, filter unit adopts frequency overlapped-resistable filter, the signal and noise bandwidth being supplied to ADC input is limited, it is prevented that unwanted aliasing effect, improves gyro machine inertia and rotates the signal to noise ratio of later stage back-emf signal；
(4) signal condition unit in the present invention, by programmable gain instrument amplifier and fully differential funnel droop amplifier cascade, it is provided that high differential input impedance and-110dB total harmonic distortion.
Accompanying drawing explanation
Fig. 1 is that one high speed dynamic pressure gyro machine of the present invention contacts to earth rotary speed test system theory diagram；
Fig. 2 is Based on Back-EMF Method waveform transfer principle figure of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
It is illustrated in figure 1 high speed dynamic pressure gyro machine to contact to earth rotary speed test system theory diagram, as seen from the figure, show and memory element including motor control unit, voltage sensor unit, three-phase voltage collecting unit, voltage comparison unit, signal condition unit, filter unit, high-speed data acquisition unit, CPU, communication unit, host computer data analysis solving unit, test result；
Motor control unit: receive the control signal that transmits of CPU, control outside gyro machine startup and stopping；
Voltage sensor unit: outside gyro machine three phase back-emf after a loss of power of test, generates three-phase voltage signal, is transferred to three-phase voltage collecting unit；
Three-phase voltage collecting unit: gather the three-phase voltage signal that voltage sensor unit transmits, and three-phase voltage signal is transferred to voltage comparison unit；
Voltage comparison unit: receive the three-phase voltage signal that three-phase voltage collecting unit transmits, and three-phase voltage signal is compared with normal voltage；When voltage magnitude is more than 12V, by three-phase voltage signal output to signal condition unit；When voltage magnitude is 1.25V-12V, by three-phase voltage signal output to signal condition unit；When voltage magnitude is 0-1.25V, three-phase voltage signal is transferred to filter unit；
Signal condition unit: by programmable gain instrument amplifier and fully differential funnel droop amplifier cascade, high differential input impedance and-110dB total harmonic distortion are provided, in the tested effective range of back-emf signal range-adjusting to-12～+12V, counter electromotive force three-phase sine-wave signal will be converted to square-wave signal simultaneously；The voltage magnitude that reception voltage comparison unit the transmits three-phase voltage signal more than 12V, and carry out blood pressure lowering process, adjust in 1.25V-12V, and carry out square wave conversion generation three-phase standard block voltage signal, transmit to filter unit；Receive the three-phase voltage signal that voltage magnitude is 1.25V-12V that voltage comparison unit transmits, and carry out square wave conversion generation three-phase standard block voltage signal, transmit to filter unit；Three-phase voltage signal after the boosting that the unit that accepts filter transmits, and three-phase voltage signal is carried out square wave conversion, it is transformed into three-phase standard block voltage signal, by three-phase standard block voltage signal transmission to filter unit；
Filter unit: for frequency overlapped-resistable filter；Receive the 0-1.25V three-phase voltage signal that voltage comparison unit transmits, be filtered and after boosting process, adjust in 1.25V-12V, by the three-phase voltage signal output after boosting to signal condition unit；The receiving signal reason three-phase standard block voltage signal that transmits of unit, directly exports three-phase standard block voltage signal to high speed data acquisition unit；Or it is transferred to high-speed data acquisition unit after three-phase standard block voltage signal is generated three-phase synchronous square wave voltage signal；
When three-phase standard block voltage signal magnitude is not within the scope of the filtering voltage set, three-phase standard block voltage signal is directly output to high-speed data acquisition unit by filter unit；When three-phase standard block voltage signal magnitude is within the scope of filtering voltage, three-phase standard block voltage signal is filtered by filter unit and differential amplification processes, voltage magnitude three-phase standard block voltage signal in predetermined voltage range is carried out noise filtering, voltage magnitude amplifies 10 times, frequency keeps synchronizing, generate three-phase synchronous square wave voltage signal, three-phase synchronous square wave voltage signal is transferred to high-speed data acquisition unit；
Wherein, the filtering voltage of setting ranges for-1～+1v；Predetermined voltage range is :-1.25V～+1.25V.
High-speed data acquisition unit: three-phase standard block voltage signal that the unit that accepts filter transmits or three-phase synchronous square wave voltage signal；And just counting 1 time of a zero crossing is often run into according to square wave voltage signal, and calculate count results j=1,2,3 ... q, q are positive integer, and count results is transferred to CPU；
CPU: first sending gyro machine enabling signal to motor control unit, after the outside gyro machine of motor control unit control reaches synchronous rotational speed, CPU sends power down control signal, and power down control signal is transferred to motor control unit；And synchronize to receive the count results that high-speed data acquisition unit transmits, store, and calculate counter electromotive force half period Tj；Tj is the intrinsic triggered time that count results is multiplied by enumerator crystal oscillator, and through communication unit, count results and counter electromotive force half period Tj are transferred to host computer data analysis solving unit；
Communication unit: receive count results and counter electromotive force half period T that CPU transmitsj, and by count results and counter electromotive force half period TjTransmit to host computer data analysis solving unit；
Host computer data analysis solving unit: count results that receiving communication unit transmits and counter electromotive force half period Tj；Calculating obtains inertial rundown time, contact time, contact to earth rotating speed and moment of resistance parameter of contacting to earth；And by inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance of contacting to earth transmission show and memory element to test result；
Test result shows and memory element: receives host computer data and resolves inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance of contacting to earth that analytic unit transmits；Real-time rotating speed is made real time value in test process and is shown and store；The moment of resistance, contact time, the rotating speed that contacts to earth, the moment of resistance of the contacting to earth parameter of contacting to earth terminates in test, is shown in test result interface.
First sent gyro machine by CPU and start signal, control signal is transferred to motor control unit, motor control unit motor driving part sub-control electric motor starting, after gyro machine reaches synchronous rotational speed, CPU sends power down control signal, control signal is transferred to motor control unit, and synchronize trigger high-speed counter start counting up, motor control unit receives the power down control signal that CPU transmits, control signal output is divided to motor driving part, controls the starting power-off stall of gyro machine；Tested gyro machine three phase back-emf after a loss of power by voltage sensor unit, generate three phase sine voltage signal, be transferred to the three-phase voltage collecting unit of slave computer；The three phase sine voltage signal of collection is transferred to voltage comparison unit by three-phase voltage collecting unit；By voltage comparison unit, three phase sine voltage signal is compared with normal voltage, it is judged that comparative result, whether within the voltage signal range of high-speed data acquisition unit, is transferred to signal condition unit by this voltage；If the three phase sine voltage signal that signal condition unit collection arrives is in high-speed data acquisition cell voltage range of signal, then do not process, if not existing, then do blood pressure lowering and process；And the three phase sine voltage signal in voltage signal range is carried out square wave conversion, it is transformed into three-phase standard block voltage signal, the three-phase square wave voltage signal after processing is transferred to filter unit；When the three-phase standard block voltage signal magnitude that filter unit receives is not within the scope of filtering voltage, this signal is transmitted directly to high-speed data acquisition unit；When this square-wave voltage signal amplitude is within the scope of effective filtering voltage, it is filtered and differential amplification processes, by voltage magnitude at (-1.25V, + 1.25V) in three-phase standard block voltage signal through noise filtering, voltage magnitude amplifies 10 times, frequency keeps synchronizing, and generates three-phase synchronous square wave voltage signal, three-phase synchronous square wave voltage signal is transferred to high-speed data acquisition unit；High-speed data acquisition unit accepts filter the three-phase standard block voltage signal and three-phase synchronous square wave voltage signal that unit transmits, the square wave count signal produced by high-resolution counter respectively enters the counting Enable Pin in high-speed data acquisition unit and High Speed Analog amount collection terminal, and count results and zero cross signal are transferred to CPU；CPU receives count signal and the zero passage collection signal that high-speed data acquisition unit transmits, and carries out storage and counter electromotive force half period time TjCalculate, j=1,2,3 ... q；TjIt is multiplied by the intrinsic triggered time of enumerator crystal oscillator, by square wave count signal and period of time T for square wave count signal numerical value between each two zero cross signaljValue is transferred to host computer process part through communication unit；The counter electromotive force half period time T that host computer data analysis solving unit receiving communication unit transmitsj, and required motor characterisitic parameter can be obtained by principle calculated below: include the contacting to earth moment of resistance, contact time, contact to earth rotating speed, inertial rundown time etc..
Inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance calculation method of parameters that contacts to earth as follows:
Inertial rundown time T:
Wherein, TjIt is powered down to rotor stalling counter electromotive force half period T for motorj, unit is s；Q is all number of semi-periods of oscillations of three-phase back-emf signal that motor is powered down to rotor stalling, i.e. count results；
The changing value Δ T of adjacent half period in power-off coasting processjFor:
ΔTj=Tj-Tj-1, j=1,2,3 ... q, unit s；
Contact time Tc: the time contacted to earth down to outside gyro machine from outside gyro machine, wherein c is the moment voltage half cycle issue that contacts to earth, and c is positive integer, it is assumed that as q=c, it is determined that contact to earth for gyro machine；
The rotating speed that contacts to earth judges: the changing value Δ T of adjacent half periodcMore than experience setting value δ, need to can obtain the value of c；
ΔTc=| Tc-Tc-1| > δ, unit s；
Real-time rotating speed n:
N=60/p (Tj+Tj-1), unit rpm；
Contact to earth rotating speed nc:
nc=60/p (Tc+Tc-1), unit rpm；
Fluctuation of speed △ ωj:
ωj=π/Tj；Δωj=π/Tj-π/Tj-1
Wherein, p is motor number of pole-pairs；
ωjFor motor angular velocity of rotation, unit is rad/s；
△ωjFor angular velocity of rotation variable quantity, unit is rad/s；
Rotational resistance square M: for moment of resistance summation suffered in outside gyro machine stalling after a loss of power；
Contact to earth moment of resistance Mc: for TcContact to earth the rotational resistance square in moment；
Wherein, J is outside gyro machine rotor moment of inertia；△ωcFor the moment gyro machine angular velocity of rotation variable quantity that contacts to earth, unit is rad/s；
It is illustrated in figure 2 Based on Back-EMF Method waveform transfer principle figure, as seen from the figure, voltage sensor unit tests gyro machine three phase back-emf after a loss of power, generate three phase sine voltage signal, be transferred to the three-phase voltage collecting unit of slave computer；The three phase sine voltage signal of collection is transferred to voltage comparison unit by three-phase voltage collecting unit；By voltage comparison unit, three phase sine voltage signal is compared with normal voltage, due to interval big by measured motor inverse electromotive force voltage span, rotating speed height, its amplification of Voltage Cortrol being required for different situations for this, the multiple reduced are to reach to meet the AD demand measured.By using high-speed programmable instrument amplifier to realize measurement and the signal condition work of circuit, signal path has decay and amplifies, need difference output to drive high-performance analog-digital converter, by a programmable gain instrument amplifier and the amplifier cascade of a fully differential funnel (decay), programmable gain instrument amplifier provides high differential input impedance and 110dB total harmonic distortion, the comparison adjustment of three phase sine voltage signal can be realized, three phase sine voltage signal is adjusted in high-speed data acquisition cell voltage range of signal.Judged the moment of its power-off by the waveform conversion of outside power-off triggering and the positive counter electromotive force in inside simultaneously, need external interrupt decision processor at a high speed and AD (speed is 28Msps) at a high speed, namely the waveform in a 1kHz frequency can continuous sampling 2333 times within one the cycle, its conversion time of judgement that can be very fast and waveform conversion conversion slope, synchronize to be converted to three-phase standard block signal by three phase sine voltage signal.
Count signal is that the high-resolution counter being selected clock frequency to be 200MHz by high-speed data acquisition unit produces, and utilizes doubler that clock frequency can be made to reach 330M；By being with the stackable stored counts device in 32,4 tunnel, isarithmic maximum is 232, and namely the time of minimum countable resolution is 0.003 microsecond, it is sufficient to meet the resolution response error time of Microsecond grade.Test start time, CPU synchronizes to trigger high-speed counter and starts counting up, and receives count signal and zero passage collection signal that high-speed data acquisition unit transmits, all stores, and calculates counter electromotive force half period Tj, j=1,2,3 ... q；TjIt is multiplied by the intrinsic triggered time of enumerator crystal oscillator, by square wave count signal and counter electromotive force half period T for square wave count signal numerical value between each two zero cross signaljIt is transferred to host computer process part, by formula Δ T through communication unitc=| Tc-Tc-1| > δ, as the changing value Δ T of adjacent half periodcDuring more than experience setting value δ, it may be achieved gyro machine contacts to earth the judgement in moment.
The operation principle of the present invention is:
The lead-out wire of dynamic pressure motor is reliably connected by phase sequence phase sequence corresponding to motor power, this tester is also received on motor lead-out wire by corresponding phase sequence simultaneously.Control electric motor starting, after dynamic pressure motor stabilizing to synchronous rotational speed, cut off dynamic pressure motor power, start to gather the data of winding back emf from this power-cut time, till motor stalls.Counter electromotive force unit voltage signal is gathered by high-speed data acquisition unit, it is sent to CPU and carries out data process, data after processing are resolved to host computer by communication unit, obtaining the gyro motor parameter needed, including real-time rotating speed, the moment of resistance of contacting to earth, inertial rundown time, contact time, contact to earth rotating speed.
Present invention advantage compared with prior art is in that:
At present, the measuring method of hydrodynamic gas bearing gyro motor characterisitic parameter is at motor status, coordinates reaction moment tester to measure its mechanical property by energy meter.But after dynamic pressure motor loads gyroscope instrument or is installed on inertial platform, the quality of motor body and hydrodynamic bearing is indirectly judged only by the voltage and current gathering gyro machine, and the most key air-bearing moment parameter of motor can not be measured, cause that air-bearing is not formed direct quantitative evaluation from after loading instrument, platform to final bullet use by gyro machine.By using a kind of high speed dynamic pressure gyro machine to contact to earth rotary speed test system, the lead-out wire between gyro machine and power supply is only needed to access this system, by to the measurement of gyro machine three-phase back-emf signal and calculating, can obtain real-time rotating speed, the moment of resistance of contacting to earth, inertial rundown time, contact time, contact to earth the characterisitic parameters such as rotating speed, it is used for judging the state of this dynamic pressure motor and air-bearing, provides reliable reference for instrument and inertial platform.
The content not being described in detail in description of the present invention belongs to the known technology of those skilled in the art.
Claims (6)
1. a high speed dynamic pressure gyro machine contacts to earth rotary speed test system, it is characterised in that: include motor control unit, voltage sensor unit, three-phase voltage collecting unit, voltage comparison unit, signal condition unit, filter unit, high-speed data acquisition unit, CPU, communication unit, host computer data analysis solving unit, test result show and memory element；
Motor control unit: receive the control signal that transmits of CPU, control outside gyro machine startup and stopping；
Voltage sensor unit: outside gyro machine three phase back-emf after a loss of power of test, generates three-phase voltage signal, is transferred to three-phase voltage collecting unit；
Three-phase voltage collecting unit: gather the three-phase voltage signal that voltage sensor unit transmits, and three-phase voltage signal is transferred to voltage comparison unit；
Voltage comparison unit: receive the three-phase voltage signal that three-phase voltage collecting unit transmits, and three-phase voltage signal is compared with normal voltage；When voltage magnitude is more than 12V, by three-phase voltage signal output to signal condition unit；When voltage magnitude is 1.25V-12V, by three-phase voltage signal output to signal condition unit；When voltage magnitude is 0-1.25V, three-phase voltage signal is transferred to filter unit；
Signal condition unit: the voltage magnitude that reception voltage comparison unit the transmits three-phase voltage signal more than 12V, and carry out blood pressure lowering process, adjust in 1.25V-12V, and carry out square wave conversion generation three-phase standard block voltage signal, transmit to filter unit；Receive the three-phase voltage signal that voltage magnitude is 1.25V-12V that voltage comparison unit transmits, and carry out square wave conversion generation three-phase standard block voltage signal, transmit to filter unit；Three-phase voltage signal after the boosting that the unit that accepts filter transmits, and three-phase voltage signal is carried out square wave conversion, it is transformed into three-phase standard block voltage signal, by three-phase standard block voltage signal transmission to filter unit；
Filter unit: receive the 0-1.25V three-phase voltage signal that voltage comparison unit transmits, is filtered and after boosting process, adjusts in 1.25V-12V, by the three-phase voltage signal output after boosting to signal condition unit；The receiving signal reason three-phase standard block voltage signal that transmits of unit, directly exports three-phase standard block voltage signal to high speed data acquisition unit；Or it is transferred to high-speed data acquisition unit after three-phase standard block voltage signal is generated three-phase synchronous square wave voltage signal；
High-speed data acquisition unit: three-phase standard block voltage signal that the unit that accepts filter transmits or three-phase synchronous square wave voltage signal；And just counting 1 time of a zero crossing is often run into according to square wave voltage signal, and calculate count results j=1,2,3 ... q, q are positive integer, and count results is transferred to CPU；
CPU: first sending gyro machine enabling signal to motor control unit, after the outside gyro machine of motor control unit control reaches synchronous rotational speed, CPU sends power down control signal, and power down control signal is transferred to motor control unit；And synchronize to receive the count results that high-speed data acquisition unit transmits, store, and calculate counter electromotive force half period Tj；Tj is the intrinsic triggered time that count results is multiplied by enumerator crystal oscillator, and through communication unit, count results and counter electromotive force half period Tj are transferred to host computer data analysis solving unit；
Communication unit: receive count results and counter electromotive force half period T that CPU transmitsj, and by count results and counter electromotive force half period TjTransmit to host computer data analysis solving unit；
Host computer data analysis solving unit: count results that receiving communication unit transmits and counter electromotive force half period Tj；Calculating obtains inertial rundown time, contact time, contact to earth rotating speed and moment of resistance parameter of contacting to earth；And by inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance of contacting to earth transmission show and memory element to test result；
Test result shows and memory element: receives host computer data and resolves inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance of contacting to earth that analytic unit transmits；Real-time rotating speed is made real time value in test process and is shown and store；The moment of resistance, contact time, the rotating speed that contacts to earth, the moment of resistance of the contacting to earth parameter of contacting to earth terminates in test, is shown in test result interface.
2. a kind of high speed dynamic pressure gyro machine described in claim 1 contacts to earth rotary speed test system, it is characterized in that: in described filter unit, when three-phase standard block voltage signal magnitude is not within the scope of the filtering voltage set, three-phase standard block voltage signal is directly output to high-speed data acquisition unit by filter unit；When three-phase standard block voltage signal magnitude is within the scope of filtering voltage, three-phase standard block voltage signal is filtered by filter unit and differential amplification processes, voltage magnitude three-phase standard block voltage signal in predetermined voltage range is carried out noise filtering, voltage magnitude amplifies 10 times, frequency keeps synchronizing, generate three-phase synchronous square wave voltage signal, three-phase synchronous square wave voltage signal is transferred to high-speed data acquisition unit.
3. a kind of high speed dynamic pressure gyro machine described in claim 2 contacts to earth rotary speed test system, it is characterised in that: the filtering voltage of setting ranges for-1～+1v；Predetermined voltage range is :-1.25V～+1.25V.
4. a kind of high speed dynamic pressure gyro machine described in claim 1 contacts to earth rotary speed test system, it is characterised in that: inertial rundown time, contact time, contact to earth rotating speed and the moment of resistance calculation method of parameters that contacts to earth as follows:
Inertial rundown time T:
Wherein, TjIt is powered down to rotor stalling counter electromotive force half period T for motorj, unit is s；Q is all number of semi-periods of oscillations of three-phase back-emf signal that motor is powered down to rotor stalling, i.e. count results；
The changing value Δ T of adjacent half period in power-off coasting processjFor:
ΔTj=Tj-Tj-1, j=1,2,3 ... q, unit s；
Contact time Tc: the time contacted to earth down to outside gyro machine from outside gyro machine, wherein c is the moment voltage half cycle issue that contacts to earth, and c is positive integer, it is assumed that as q=c, it is determined that contact to earth for gyro machine；
The rotating speed that contacts to earth judges: the changing value Δ T of adjacent half periodcMore than experience setting value δ, need to can obtain the value of c；
ΔTc=| Tc-Tc-1| > δ, unit s；
Real-time rotating speed n:
N=60/p (Tj+Tj-1), unit rpm；
Contact to earth rotating speed nc:
nc=60/p (Tc+Tc-1), unit rpm；
Fluctuation of speed △ ωj:
ωj=π/Tj；Δωj=π/Tj-π/Tj-1
Wherein, p is motor number of pole-pairs；
ωjFor motor angular velocity of rotation, unit is rad/s；
△ωjFor angular velocity of rotation variable quantity, unit is rad/s；
Rotational resistance square M: for moment of resistance summation suffered in outside gyro machine stalling after a loss of power；
Contact to earth moment of resistance Mc: for TcContact to earth the rotational resistance square in moment；
Wherein, J is outside gyro machine rotor moment of inertia；△ωcFor the moment gyro machine angular velocity of rotation variable quantity that contacts to earth, unit is rad/s.
5. a kind of high speed dynamic pressure gyro machine described in claim 1 contacts to earth rotary speed test system, it is characterized in that: in described signal condition unit, by programmable gain instrument amplifier and fully differential funnel droop amplifier cascade, high differential input impedance and-110dB total harmonic distortion are provided, in the tested effective range of back-emf signal range-adjusting to-12～+12V, counter electromotive force three-phase sine-wave signal will be converted to square-wave signal simultaneously.
6. a kind of high speed dynamic pressure gyro machine described in claim 1 contacts to earth rotary speed test system, it is characterised in that: described filter unit is frequency overlapped-resistable filter.
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