CN110488038B - Method and device for detecting rotating speed of rotating anode bulb tube rotor - Google Patents
Method and device for detecting rotating speed of rotating anode bulb tube rotor Download PDFInfo
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- CN110488038B CN110488038B CN201910745296.2A CN201910745296A CN110488038B CN 110488038 B CN110488038 B CN 110488038B CN 201910745296 A CN201910745296 A CN 201910745296A CN 110488038 B CN110488038 B CN 110488038B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/4802—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general
- G01P3/4805—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage by using electronic circuits in general by using circuits for the electrical integration of the generated pulses
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
- H01J35/101—Arrangements for rotating anodes, e.g. supporting means, means for greasing, means for sealing the axle or means for shielding or protecting the driving
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- X-Ray Techniques (AREA)
Abstract
The invention discloses a method and a device for detecting the rotating speed of a rotating anode bulb tube rotor, wherein the rotating speed detection method comprises the following steps: s1: the MCU controller intermittently generates an SPWM control sequence through a control algorithm so as to drive the three-phase frequency converter to generate corresponding alternating current output; s2: three alternating current output ends of the three-phase frequency converter are connected to an X-ray bulb tube stator coil so as to drive an X-ray bulb tube rotor to rotate; s3: induced voltage is mutually inducted from two alternating current output ends of three alternating current output ends of the three-phase frequency converter so as to obtain the back electromotive voltage with the same frequency as the X-ray bulb tube rotor. According to the invention, the voltage sampling circuit is embedded in the three-phase frequency converter, the rotor rotating speed information is obtained by using the back electromotive force in an intervention mode, the functions of accurate reading and real-time monitoring of the rotor rotating speed are achieved, and the problems that the rotating speed of the rotor of the X-ray bulb tube is difficult to detect and the problems that the rotating speed of the rotor cannot be detected in real time and the reading error exists by using a conventional mechanical synchronous vibration detection means are solved.
Description
Technical Field
The invention relates to the technical field of rotating speed detection of anode bulb tube rotors, in particular to a rotating speed detection method and a rotating speed detection device of a rotating anode bulb tube rotor.
Background
The rotating anode tube is a high-performance tube after the appearance of a high-power X-ray machine, the tube can work with larger current under a small focus, and the X-ray generator is widely applied to various devices using X-rays, for example, a device for exposing and imaging by using X-rays, and has a great influence in the field of medical imaging. At present, the rotating speed of the rotating anode bulb tube rotor is more than 3000 revolutions per minute, the rotating speed of the high-speed rotating anode bulb tube can reach 7200 revolutions per minute, the rotating speed of the ultra-high-speed bulb tube can reach more than 1 ten thousand revolutions per minute at present, the rotating speed of the bulb tube anode rotor is designed according to the focus current density of the bulb tube, the smaller the focus of the bulb tube with the same current is, the higher the rotating speed of the bulb tube rotating anode rotor is required to be. However, the rotating speed of the rotating anode X-ray bulb tube rotor is difficult to detect, the rotating speed of the rotor cannot be detected in real time by a conventional mechanical synchronous vibration detection method, and the problem of reading errors exists.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a device for detecting the rotating speed of a rotating anode bulb tube rotor, which have the functions of accurate reading and real-time monitoring of the rotating speed of the rotor.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a rotating speed detection method for a rotating anode bulb tube rotor comprises the following steps:
s1: the MCU controller intermittently generates an SPWM control sequence through a control algorithm so as to drive the three-phase frequency converter to generate corresponding alternating current output;
s2: three alternating current output ends of the three-phase frequency converter are connected to an X-ray bulb tube stator coil so as to drive an X-ray bulb tube rotor to rotate;
s3: inducing voltage is mutually induced from two alternating current output ends of three alternating current output ends of the three-phase frequency converter, so that the back electromotive voltage with the same frequency as the X-ray bulb tube rotor is obtained from the inducing voltage;
during the intermittent rest period, the X-ray bulb tube rotor generates a reverse electromotive force, and the reverse electromotive force voltage carries an alternating current signal with the same frequency as the X-ray bulb tube rotor;
s4: extracting a reverse electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage through a reverse electromotive voltage signal extraction circuit, and converting the reverse electromotive voltage into a synchronous pulse square wave through a comparator, wherein the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor;
s5: the synchronous pulse square wave signals are converted into pulse signals through an isolation circuit, and the pulse signals are captured and counted through the MCU controller to obtain the frequency of the synchronous pulse square wave, so that the rotating speed of the X-ray bulb tube rotor is obtained.
Preferably, the MCU controller is provided with an intermittent output strategy, where the intermittent output strategy includes controlling the three-phase converter to output a first output signal every first interval time, and maintaining the first output signal for a second interval time.
Preferably, the first interval time is set to 100ms, and the second interval time is set to 1.5 s.
Preferably, step S3 is to obtain the induced voltage from two ac output terminals of the three-phase inverter by direct sampling.
Preferably, the three-phase frequency converter comprises a driving circuit and a three-phase inverter bridge circuit, the input end of the driving circuit is electrically connected with the output end of the MCU controller, the input control end of the three-phase inverter bridge circuit is electrically connected with the output end of the driving circuit, and the MCU controller can control the three-phase frequency converter to generate an SPWM control sequence.
A rotating speed detection device for a rotating anode bulb tube rotor comprises an X-ray bulb tube stator coil, an X-ray bulb tube rotor, an MCU controller, a driving circuit, a three-phase frequency converter, a voltage sampling circuit, a back electromotive force signal extraction circuit, a comparator and an isolation circuit;
the X-ray tube rotor comprises an X-ray tube stator coil, an MCU controller, a three-phase frequency converter, an X-ray tube rotor and an X-ray tube stator coil, wherein the MCU controller is electrically connected with the driving circuit, the driving circuit is electrically connected with the three-phase frequency converter and is used for controlling the three-phase frequency converter to intermittently generate an SPWM control sequence through the MCU controller, the three-phase frequency converter is electrically connected with the X-ray tube stator coil, and the X-ray tube stator coil generates a rotating magnetic field to drive the X-ray tube rotor to rotate when working;
the voltage sampling circuit is electrically connected with two alternating current output ends of three alternating current output ends of the three-phase frequency converter and is used for acquiring induced voltage from the two alternating current output ends of the three-phase frequency converter so as to acquire back electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage;
the back electromotive force signal extraction circuit is electrically connected with the output end of the voltage sampling circuit and is used for filtering line voltage between the two alternating current output ends and extracting back electromotive force signals from induced voltage;
the output end of the back electromotive force signal extraction circuit is electrically connected with the comparator and is used for converting the back electromotive force signal into a synchronous pulse square wave, and the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor;
the output end of the comparator is electrically connected with the MCU controller through the isolation circuit and used for converting the synchronous pulse square wave signals into pulse signals through the isolation circuit, and the MCU controller is used for capturing and counting the pulse signals to obtain the frequency of the synchronous pulse square wave, so that the rotating speed of the X-ray bulb tube rotor can be obtained.
Preferably, the comparator is powered by an isolated power supply circuit, the isolated power supply circuit includes a 555 timer circuit and a transformer T6, the 555 timer circuit is electrically connected to the primary side of the transformer T6 through a MOS transistor Q4, and the 555 timer circuit is configured to provide an electric pulse with a specific frequency to control the on and off of the MOS transistor Q4.
Preferably, the output end of the 555 timer circuit is electrically connected with the gate of the MOS transistor Q4, and the source of the MOS transistor Q4 is electrically connected with the primary side of the transformer T6; two ends of the MOS transistor Q4 are connected in parallel with an absorption capacitor C38, and the absorption capacitor C38 is used for absorbing spike voltage during the turn-on and turn-off of the MOS transistor Q4.
Preferably, the secondary side of the transformer T6 is electrically connected to the rectifier bridge circuit, and is configured to convert an ac voltage at the secondary side of the transformer T6 into a dc voltage, so as to provide a dc supply voltage for the comparator.
Preferably, the back electromotive force extraction circuit comprises current limiting resistors R1 and R3 respectively connected in series to the two-phase ac output circuit, and a capacitor C1 connected in parallel between the current limiting resistors R1 and R3, two diodes D1 and D2 are connected in parallel to two ends of the capacitor C1, and two diodes D1 and D2 are connected in anti-parallel.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the X-ray bulb tube rotor rotation speed detection device comprises an MCU controller, a driving circuit, a three-phase frequency converter, a voltage sampling circuit, a back electromotive force signal extraction circuit, a comparator and an isolation circuit; the MCU controller controls a three-phase frequency converter to intermittently generate an SPWM control sequence, and the three-phase frequency converter is electrically connected with an X-ray bulb tube stator coil to generate a rotating magnetic field to drive an X-ray bulb tube rotor to rotate; the invention obtains induced voltage from two alternating current output ends of a three-phase frequency converter by designing a voltage sampling circuit so as to obtain the back electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage; the method obtains the rotating speed information of the X-ray bulb tube rotor by using the back electromotive force in an intervention mode, and has the functions of accurate reading and real-time monitoring of the rotating speed of the rotor. The back electromotive force signal extraction circuit is used for filtering line voltage between two phases and extracting back electromotive force signals from the voltage sampling circuit; the comparator is used for converting the back electromotive force signal into a synchronous pulse square wave, and the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor; the isolation circuit is used for converting the synchronous pulse square wave signals into pulse signals which can be collected by the MCU controller, and the frequency of the pulse signals, namely the rotating speed of the X-ray bulb tube rotor, is obtained by capturing and counting through the MCU controller.
Drawings
FIG. 1 is a circuit connection block diagram of a device for detecting the rotating speed of a rotating anode bulb tube rotor according to the present invention;
FIG. 2 is a schematic circuit diagram of an MCU controller in the method and apparatus for detecting the rotating speed of a rotating anode bulb rotor according to the present invention;
FIG. 3 is a schematic circuit diagram of a driving circuit in the method and apparatus for detecting the rotating speed of a rotating anode bulb rotor according to the present invention;
FIG. 4 is a schematic circuit diagram of a three-phase frequency converter in the method and apparatus for detecting the rotating speed of a rotating anode bulb tube rotor according to the present invention;
FIG. 5 is a schematic circuit diagram of a back electromotive force signal extraction circuit, a comparator and an isolation circuit in the method and apparatus for detecting the rotating speed of a rotating anode bulb tube rotor according to the present invention;
FIG. 6 is a schematic circuit diagram of a 555 timer and a transformer T6 in the method and the device for detecting the rotating speed of a rotating anode bulb rotor according to the present invention;
fig. 7 is a schematic circuit diagram of a rectifier bridge circuit connected to a transformer T6 in the method and apparatus for detecting the rotating speed of a rotating anode bulb rotor according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, an embodiment of the present invention is shown: a rotating speed detection method for a rotating anode bulb tube rotor comprises the following steps:
s1: the MCU controller intermittently generates an SPWM control sequence through a control algorithm so as to drive the three-phase frequency converter to generate corresponding alternating current output;
s2: three alternating current output ends of the three-phase frequency converter are connected to an X-ray bulb tube stator coil so as to drive an X-ray bulb tube rotor to rotate;
s3: inducing voltage is mutually induced from two alternating current output ends of three alternating current output ends of the three-phase frequency converter, so that the back electromotive voltage with the same frequency as the X-ray bulb tube rotor is obtained from the inducing voltage;
during the intermittent rest period, the X-ray bulb tube rotor generates a reverse electromotive force, and the reverse electromotive force voltage carries an alternating current signal with the same frequency as the X-ray bulb tube rotor;
s4: extracting a reverse electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage through a reverse electromotive voltage signal extraction circuit, and converting the reverse electromotive voltage into a synchronous pulse square wave through a comparator, wherein the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor;
s5: the synchronous pulse square wave signals are converted into pulse signals through an isolation circuit, and the pulse signals are captured and counted through the MCU controller to obtain the frequency of the synchronous pulse square wave, so that the rotating speed of the X-ray bulb tube rotor is obtained.
In an embodiment of the present invention, the MCU controller is provided with an intermittent output strategy, where the intermittent output strategy includes controlling the three-phase converter to output a first output signal every a first interval time, and maintaining the first output signal for a second interval time.
In an embodiment of the present invention, the first interval time is set to 100ms, and the second interval time is set to 1.5 s.
In an embodiment of the present invention, step S3 obtains the induced voltage from the two ac output terminals of the three-phase inverter by using a direct sampling method.
According to one embodiment provided by the invention, the three-phase frequency converter comprises a driving circuit and a three-phase inverter bridge circuit, wherein the input end of the driving circuit is electrically connected with the output end of the MCU controller, the input control end of the three-phase inverter bridge circuit is electrically connected with the output end of the driving circuit, and the MCU controller can control the three-phase frequency converter to generate an SPWM control sequence.
As shown in fig. 1, a circuit connection block diagram of the device for detecting the rotating speed of the rotary anode bulb tube rotor of the present invention is a device for detecting the rotating speed of the rotary anode bulb tube rotor, which comprises an X-ray bulb tube stator coil, an X-ray bulb tube rotor, an MCU controller, a driving circuit, a three-phase frequency converter, a voltage sampling circuit, a back electromotive force signal extraction circuit, a comparator and an isolation circuit;
the MCU controller is electrically connected with the driving circuit, the driving circuit is electrically connected with the three-phase frequency converter and is used for controlling the three-phase frequency converter to intermittently generate an SPWM control sequence through the MCU controller, the three-phase frequency converter is electrically connected with the X-ray bulb tube stator coil, and a rotating magnetic field is generated to drive the X-ray bulb tube rotor to rotate during the work of the X-ray bulb tube stator coil.
Specifically, as shown in fig. 1 to 3, fig. 2 is a schematic circuit diagram of an MCU controller, and fig. 3 is a schematic circuit diagram of a driving circuit, in this embodiment, the MCU controller uses an STM32 chip as a main control chip, the driving circuit includes a buffer and a gate driver, wherein the buffer uses an SN74LV244 tri-state output eight-way buffer, and the gate driver uses an UCC21520 isolated dual-channel gate driver. The 29 th pin, the 30 th pin, the 31 th pin, the 26 th pin, the 27 th pin and the 28 th pin of the STM32 chip are respectively connected with the 2 nd pin, the 6 th pin, the 11 th pin, the 4 th pin, the 8 th pin and the 13 th pin of a buffer and are used for controlling a driving circuit to generate an SPWM control sequence so as to drive the three-phase frequency converter to generate alternating current output with specific frequency and amplitude.
The voltage sampling circuit is electrically connected with two alternating current output ends of three alternating current output ends of the three-phase frequency converter and used for obtaining induced voltage from the two alternating current output ends of the three-phase frequency converter so as to obtain back electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage.
According to the law of electromagnetism, when the magnetic field changes, the nearby conductor will generate induced electromotive force, the direction of which is in accordance with the law of faraday and lenz and is opposite to the original voltage applied to the two ends of the coil. This voltage is a back electromotive voltage.
Specifically, as shown in fig. 4, which is a schematic circuit diagram of a three-phase frequency converter according to the present invention, the three-phase frequency converter includes a three-phase inverter bridge circuit to generate a sinusoidal ac voltage signal with a specific frequency and an amplitude; inducing voltage is mutually induced from two alternating current output ends of three alternating current output ends of the three-phase frequency converter in a direct sampling mode, so that the back electromotive voltage with the same frequency as the X-ray bulb tube rotor is obtained from the inducing voltage; in this embodiment, the MCU controller controls the three-phase frequency converter to output a sinusoidal ac voltage signal in an intermittent manner, and stops outputting after every 1.5s, so that during the intermittent period, the X-ray tube rotor will form a reverse excitation, the generated reverse electromotive force is applied to the three-phase line, the voltage sampling circuit obtains the reverse electromotive voltage through the two-phase line in the three-phase, and the sampling voltage carries ac information with the same frequency as the X-ray tube rotor.
The back electromotive force signal extraction circuit is electrically connected with the output end of the voltage sampling circuit and is used for filtering line voltage between the two alternating current output ends and extracting back electromotive force signals from induced voltage;
the output end of the back electromotive force signal extraction circuit is electrically connected with the comparator and is used for converting the back electromotive force signal into a synchronous pulse square wave, and the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor;
the output end of the comparator is electrically connected with the MCU controller through an isolation circuit and is used for converting the synchronous pulse square wave signal into a pulse signal through the isolation circuit, and capturing and counting the pulse signal through the MCU controller to obtain the frequency of the synchronous pulse square wave, so that the rotating speed of the X-ray bulb tube rotor can be obtained; the isolation circuit adopts an optical coupling isolation chip with the model number of CNY17-4 to carry out photoelectric isolation.
In an embodiment of the present invention, the comparator is powered by an isolated power circuit, the isolated power circuit includes a 555 timer circuit and a transformer T6, the 555 timer circuit is electrically connected to a primary side of the transformer T6 through a MOS transistor Q4, and the 555 timer circuit is configured to provide an electric pulse with a specific frequency to control the on and off of the MOS transistor Q4.
Specifically, as shown in fig. 5 to 7, fig. 5 is a schematic circuit diagram of a back electromotive force signal extraction circuit, a comparator and an isolation circuit in the present invention, fig. 6 is a schematic circuit diagram of a 555 timer connected to a transformer T6, fig. 7 is a schematic circuit diagram of a rectifier bridge circuit connected to a transformer T6, and the rectifier bridge circuit is connected to a transformer T6, which provides an embodiment of the present invention: the output terminal of the 555 timer circuit is electrically connected to the gate of the MOS transistor Q4, and the source of the MOS transistor Q4 is electrically connected to the primary side of the transformer T6. The primary side of the transformer T6 is powered by a direct current 24V power supply, an electric pulse with a specific frequency provided by the 555 timer circuit is changed into an alternating current signal and is mutually inducted to the secondary side of the transformer T6, the secondary side of the transformer T6 is electrically connected with the rectifier bridge circuit and is used for converting the alternating current voltage on the secondary side of the transformer T6 into direct current voltage and providing direct current power supply voltage for the comparator.
Two ends of the MOS transistor Q4 are connected in parallel with an absorption capacitor C38, and the absorption capacitor C38 is used for absorbing spike voltage during the turn-on and turn-off of the MOS transistor Q4. The back electromotive force extraction circuit comprises current-limiting resistors R1 and R3 which are respectively connected in series with the two-phase alternating current output circuit, and a capacitor C1 which is connected in parallel between the current-limiting resistors R1 and R3, two diodes D1 and D2 are connected in parallel at two ends of the capacitor C1, and the two diodes D1 and D2 are connected in anti-parallel. The back emf signal is extracted from the voltage sampling circuit by filtering the line voltage between the two phases through current limiting resistors R1 and R3 and diodes D1 and D2.
The working principle is as follows: firstly, the MCU controller controls a driving circuit to generate an SPWM control sequence through a control algorithm so as to drive a three-phase frequency converter to generate alternating current output with specific frequency and amplitude, wherein the MCU controller controls the three-phase frequency converter to output a sinusoidal alternating current voltage signal in an intermittent mode, and the output is stopped at an interval of 100ms after every 1.5s of output; the alternating current output of the three-phase frequency converter is connected to the stator coil of the X-ray bulb tube so as to drive the rotor of the X-ray bulb tube to rotate; then, inducing voltage is mutually induced from two alternating current output ends of three alternating current output ends of the three-phase frequency converter in a direct sampling mode, so that the back electromotive voltage with the same frequency as the X-ray bulb tube rotor is obtained from the inducing voltage; during the intermission period, the X-ray bulb tube rotor forms reverse excitation, and the back electromotive voltage carrying the same frequency of alternating current information as the X-ray bulb tube rotor is obtained through a two-phase circuit in a three-phase alternating current output circuit; then the line voltage between the two alternating current output ends is filtered through a back electromotive force signal extraction circuit, and a back electromotive force signal is extracted from the induction voltage; the output end of the back electromotive force signal extraction circuit is electrically connected with the comparator and is used for converting the back electromotive force signal into a synchronous pulse square wave, and the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor; and finally, converting the square wave signal floating on the three-phase variable-frequency power voltage output into a pulse signal which can be collected by the MCU controller through an isolation circuit, and capturing and counting through the MCU controller to obtain the frequency of the synchronous pulse square wave, thereby obtaining the rotating speed of the X-ray bulb tube rotor.
Because the X-ray bulb tube rotor is sealed in the tube core and can not detect the rotating speed in an electric contact mode, the invention obtains two-phase sampling voltage, namely the back electromotive voltage with the same frequency as the X-ray bulb tube rotor from the alternating current output circuit of the three-phase frequency converter by designing the voltage sampling circuit, obtains the rotating speed information of the X-ray bulb tube rotor by utilizing the back electromotive voltage in an intervention mode, and has the functions of accurate reading and real-time monitoring of the rotating speed of the rotor.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A rotating speed detection method of a rotating anode bulb tube rotor is characterized by comprising the following steps:
s1: the MCU controller intermittently generates an SPWM control sequence through a control algorithm so as to drive the three-phase frequency converter to generate corresponding alternating current output;
s2: three alternating current output ends of the three-phase frequency converter are connected to an X-ray bulb tube stator coil so as to drive an X-ray bulb tube rotor to rotate;
s3: inducing voltage is mutually induced from two alternating current output ends of three alternating current output ends of the three-phase frequency converter, so that the back electromotive voltage with the same frequency as the X-ray bulb tube rotor is obtained from the inducing voltage;
during the intermittent rest period, the X-ray bulb tube rotor generates a reverse electromotive force, and the reverse electromotive force voltage carries an alternating current signal with the same frequency as the X-ray bulb tube rotor;
s4: extracting a reverse electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage through a reverse electromotive voltage signal extraction circuit, and converting the reverse electromotive voltage into a synchronous pulse square wave through a comparator, wherein the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor;
s5: the synchronous pulse square wave signals are converted into pulse signals through an isolation circuit, and the pulse signals are captured and counted through the MCU controller to obtain the frequency of the synchronous pulse square wave, so that the rotating speed of the X-ray bulb tube rotor is obtained.
2. The method as claimed in claim 1, wherein the MCU controller is configured with an intermittent output strategy, the intermittent output strategy comprises controlling the three-phase inverter to output a first output signal every first interval time, and maintaining the first output signal for a second interval time.
3. The method as claimed in claim 2, wherein the first interval time is set to 100ms, and the second interval time is set to 1.5 s.
4. The method as claimed in claim 1, wherein step S3 is implemented by using direct sampling to obtain induced voltages from two ac output terminals of the three-phase inverter.
5. The method according to claim 1, wherein the three-phase inverter comprises a driving circuit and a three-phase inverter bridge circuit, an input terminal of the driving circuit is electrically connected to an output terminal of the MCU controller, an input control terminal of the three-phase inverter bridge circuit is electrically connected to an output terminal of the driving circuit, and the MCU controller is capable of controlling the three-phase inverter to generate an SPWM control sequence.
6. A rotating speed detection device for a rotating anode bulb tube rotor comprises an X-ray bulb tube stator coil and an X-ray bulb tube rotor, and is characterized by further comprising an MCU (microprogrammed control Unit) controller, a driving circuit, a three-phase frequency converter, a voltage sampling circuit, a back electromotive force signal extraction circuit, a comparator and an isolation circuit;
the X-ray tube rotor comprises an X-ray tube stator coil, an MCU controller, a three-phase frequency converter, an X-ray tube rotor and an X-ray tube stator coil, wherein the MCU controller is electrically connected with the driving circuit, the driving circuit is electrically connected with the three-phase frequency converter and is used for controlling the three-phase frequency converter to intermittently generate an SPWM control sequence through the MCU controller, the three-phase frequency converter is electrically connected with the X-ray tube stator coil, and the X-ray tube stator coil generates a rotating magnetic field to drive the X-ray tube rotor to rotate when working;
the voltage sampling circuit is electrically connected with two alternating current output ends of three alternating current output ends of the three-phase frequency converter and is used for acquiring induced voltage from the two alternating current output ends of the three-phase frequency converter so as to acquire back electromotive voltage with the same frequency as the X-ray bulb tube rotor from the induced voltage;
the back electromotive force signal extraction circuit is electrically connected with the output end of the voltage sampling circuit and is used for filtering line voltage between the two alternating current output ends and extracting back electromotive force signals from induced voltage;
the output end of the back electromotive force signal extraction circuit is electrically connected with the comparator and is used for converting the back electromotive force signal into a synchronous pulse square wave, and the frequency of the synchronous pulse square wave is the frequency of the X-ray bulb tube rotor;
the output end of the comparator is electrically connected with the MCU controller through the isolation circuit and used for converting the synchronous pulse square wave signals into pulse signals through the isolation circuit, and the MCU controller is used for capturing and counting the pulse signals to obtain the frequency of the synchronous pulse square wave, so that the rotating speed of the X-ray bulb tube rotor can be obtained.
7. The apparatus as claimed in claim 6, wherein the comparator is powered by an isolated power circuit, the isolated power circuit comprises a 555 timer circuit and a transformer T6, the 555 timer circuit is electrically connected to the primary side of the transformer T6 through a MOS transistor Q4, and the 555 timer circuit is used for providing an electric pulse with a specific frequency to control the on and off of the MOS transistor Q4.
8. The apparatus as claimed in claim 7, wherein the output terminal of the 555 timer circuit is electrically connected to the gate of the MOS transistor Q4, and the source of the MOS transistor Q4 is electrically connected to the primary side of the transformer T6; two ends of the MOS transistor Q4 are connected in parallel with an absorption capacitor C38, and the absorption capacitor C38 is used for absorbing spike voltage during the turn-on and turn-off of the MOS transistor Q4.
9. The apparatus as claimed in claim 7, wherein the secondary side of the transformer T6 is electrically connected to a rectifier bridge circuit for converting the ac voltage at the secondary side of the transformer T6 into dc voltage to provide the dc voltage to the comparator.
10. The device as claimed in claim 6, wherein the back electromotive force signal extraction circuit comprises current limiting resistors R1 and R3 respectively connected in series with the two-phase AC output circuit, and a capacitor C1 connected in parallel between the current limiting resistors R1 and R3, and two diodes D1 and D2 connected in parallel between two ends of the capacitor C1, and two diodes D1 and D2 connected in anti-parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910745296.2A CN110488038B (en) | 2019-08-13 | 2019-08-13 | Method and device for detecting rotating speed of rotating anode bulb tube rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910745296.2A CN110488038B (en) | 2019-08-13 | 2019-08-13 | Method and device for detecting rotating speed of rotating anode bulb tube rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110488038A CN110488038A (en) | 2019-11-22 |
| CN110488038B true CN110488038B (en) | 2022-03-22 |
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| DE19752114A1 (en) * | 1997-11-25 | 1999-05-27 | Philips Patentverwaltung | Drive device for an X-ray rotating anode and method for controlling the drive device |
| CN1265683C (en) * | 2004-11-12 | 2006-07-19 | 于红林 | Rotary anode control method and control device therefor |
| CN105517309B (en) * | 2014-10-16 | 2018-06-29 | 锐珂（上海）医疗器材有限公司 | The anode Rotating speed measring of x ray generator |
| CN106712594A (en) * | 2015-07-14 | 2017-05-24 | 李永诚 | Motor driver of motor control system |
| CN106291058A (en) * | 2016-08-15 | 2017-01-04 | 珠海凌达压缩机有限公司 | The counter electromotive force measurement apparatus of a kind of motor and method |
| US10816437B2 (en) * | 2017-03-22 | 2020-10-27 | General Electric Company | Contactless rotor state/speed measurement of x-ray tube |
| CN107635347B (en) * | 2017-09-08 | 2019-10-25 | 苏州博思得电气有限公司 | The control method and device of X-ray tube, driving device, X-ray generator |
| CN107589765B (en) * | 2017-09-08 | 2021-12-10 | 苏州博思得电气有限公司 | Method and device for controlling rotary electrode of X-ray tube, and drive device |
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