CN109085419B - Magnetizing peak current measuring method and device for magnetizing machine - Google Patents
Magnetizing peak current measuring method and device for magnetizing machine Download PDFInfo
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- CN109085419B CN109085419B CN201811043943.7A CN201811043943A CN109085419B CN 109085419 B CN109085419 B CN 109085419B CN 201811043943 A CN201811043943 A CN 201811043943A CN 109085419 B CN109085419 B CN 109085419B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
- G01R29/023—Measuring pulse width
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Abstract
The invention discloses a method and a device for measuring magnetizing peak current of a magnetizing machine. According to the invention, a current sensor is connected in series on a loop between a magnetizing machine and a magnetizing coil, and the magnitude and the width of peak current are measured through a magnetizing current measuring circuit system. The detection method and the circuit designed by the invention realize the on-line measurement function of the magnetizing peak current of the magnetizing machine, improve the precise control of the magnetizing quantity of the magnetic steel and reduce the potential safety hazard in the magnetizing process.
Description
Technical Field
The invention belongs to the technical field of electronic measurement and inspection, and relates to a method and a device for measuring magnetizing peak current of a magnetizing machine.
Background
The magnetizing apparatus is an essential key device in the process of producing and developing various permanent magnet devices, and is widely applied to various fields of micro-special motors, instruments, consumer electronics, medical appliances, daily industries and the like. After magnetizing by a magnetizer, the magnetic field parameters and distribution of the permanent magnetic material directly influence the running performance of the permanent magnetic material, and with the improvement of the degree of automation and the development of electronics, computers, high-new technology and other fields, a uniform and stable magnetic field is required in large medical instruments and industrial measurement, and the requirements on the stability and uniformity of the magnetic field are extremely high, so that the requirement on the permanent magnetic material is certain, and the magnetizing current of the magnetizer is required to be accurately controlled. Therefore, it is particularly important to detect the current of the magnetizer.
The working principle of the magnetizer is mainly that direct-current high-voltage current charges a capacitor, and then the capacitor is discharged through a coil with a tiny resistance, so that peak current with a maximum peak value of tens of thousands of amperes is obtained. The current generates a strong magnetic field in the coil, thereby magnetizing the magnetic material placed in the coil. For materials with different magnetic requirements, the peak current and the width of the magnetizing machine are different, and the two parameters directly determine the magnetic flux of the magnetic steel.
Disclosure of Invention
Aiming at the problems that the peak pulse current of the existing magnetizing machine is overlarge, the automatic current detection function is lacked, the potential safety hazard is large, and the like, the invention provides a method for accurately measuring the peak current of the magnetizing machine, designs a related peak current detection circuit, detects the peak current and the width of the magnetizing machine, and obtains the dynamic characteristic of the magnetizing pulse current.
The technical scheme adopted for solving the technical problems is as follows:
the invention provides a method and a device for measuring peak current of a magnetizing machine. And a current sensor is connected in series on a loop between the magnetizing machine and the magnetizing coil, and the peak current dynamic characteristic of the magnetizing machine is obtained by measuring the peak current and the peak width of the current sensor through a magnetizing current measuring circuit system.
The method for measuring the peak current of the magnetizing machine mainly designs a current conversion voltage module, a peak hold circuit module, an AD detection module, a high-speed AD detection module, a CPLD system, an external RAM, an MCU singlechip system, an upper computer and a communication system in a magnetizing current measuring circuit system. The specific measurement method is that the current of the current sensor is converted into voltage through a current-voltage conversion module, the peak value voltage of the current is stored through a peak value holding circuit, and then the peak value voltage is read by an AD detection module to be further processed by a singlechip, and the maximum peak value voltage can only be obtained due to the low sampling frequency of the AD detection module. The other high-speed AD detection module adopts high-speed AD sampling to measure and obtain the waveform of the discharge current. The CPLD temporarily stores the measured AD conversion digital quantity in an external RAM system, and the CPLD system transmits the data stored in the RAM system to the singlechip after the measurement is completed. The singlechip corrects the obtained high-speed AD sampling value Gad [ i ] according to the peak value LAD sampled by the AD detection module, namely Gad [ i ] LAD/Gadmax, wherein Gadmax is the maximum value of the high-speed AD sampling value Gad [ i ], and then calculates the magnitude and the width of peak current according to the corrected high-speed sampling value.
The invention has the beneficial effects that: the method and the device for measuring the magnetizing peak current of the magnetizing machine can accurately measure the peak current and the width of the magnetizing machine and reduce equipment damage caused by overlarge peak current. The maximum magnetizing peak current of the magnetizer is corrected through high-speed AD detection and a CPLD system, so that the energy consumption is reduced and the cost is saved for accurately magnetizing the magnetic material.
Drawings
FIG. 1 is a block diagram of a magnetizing peak current measuring device of a magnetizer;
FIG. 2 is a schematic diagram of the magnetizing peak current signal of the magnetizer;
FIG. 3 is a schematic diagram of a module connection of a magnetizing peak current measurement system of the magnetizer;
FIG. 4 is a circuit diagram of a specific connection of a magnetizing peak current measurement system of the magnetizer;
fig. 5 is a specific connection diagram of the peak current conversion voltage and peak hold circuit.
Detailed Description
In order to more clearly illustrate the present invention, the following description is provided with reference to the accompanying drawings.
Fig. 1 is a block diagram of a magnetizing peak current measuring apparatus of a magnetizer. As shown in fig. 1, a current sensor is connected in series on the loop of the magnetizing machine and the magnetizing coil, and the current flowing through the current sensor is measured by a magnetizing current measuring circuit, so that the current of the magnetizing machine is obtained, and the shielding shell of the current sensor and the magnetizing current measuring circuit are grounded together to reduce external interference.
Fig. 2 is a schematic diagram of magnetizing peak current signals of the magnetizer. When the magnetizer works, the generated current is shown as figure 2, the peak value of the magnetizing current peak of the magnetizer is the peak amplitude, and the peak pulse width is D. The peak amplitude LAD is measured by an AD detection module, the charging current waveform is obtained by a high-speed AD detection module, and the peak pulse width D can be calculated according to the number of continuous non-zero values in the Gad [ i ] array of the high-speed AD sampling values and the sampling frequency.
Fig. 3 is a schematic diagram of the connection of the magnetizing peak current measuring system modules of the magnetizing apparatus. As shown in fig. 2, the peak current measurement system mainly comprises a current sensor, a peak hold circuit module, an AD detection module, a high-speed AD detection module, a CPLD system, an external RAM system, an MCU (micro control unit) single chip system, an upper computer and a 485 communication system. The current flowing through the current sensor is converted into peak voltage through a current-to-voltage circuit, then the peak voltage is transmitted to a peak holding circuit, and one path of the current is directly transmitted to the singlechip through an ADC (12-bit) conversion circuit to wait for further processing; after the other path is converted by a high-speed ADC (24 bits), peak voltage is transmitted to a CPLD system, the singlechip corrects the maximum peak voltage by the CPLD, the dynamic characteristics of magnetizing current are stored in an external RAM system, and the PC-end upper computer sets relevant peak correction parameters stored by the singlechip by 485 communication.
Fig. 4 is a circuit diagram of a specific connection of the magnetizing peak current measuring system of the magnetizer. As shown in the figure, the area 1 is the minimum system module of the singlechip, the singlechip number of the U10 selects the MSP430F437 chip of TI, wherein the AVcc and DVcc ends of the U10 are directly connected with the anode of the capacitor CD10, one end of the capacitor C10 and the power supply VDD; the negative electrode of the CD10 and the other end of the capacitor C10 are connected with digital DGND; the RST end of the U10 is connected with one end of the resistor R10 and one end of the capacitor C11; the other end of the resistor R10 is connected with a power supply VDD, and the other end of the capacitor C11 is connected with digital ground DGND; the XIN end of the U10 is connected with one end of the crystal oscillator X10 and one end of the capacitor C12; the XOUT end of U10 is connected with the other end of crystal oscillator X10 and one end of capacitor C13; the other end of the capacitor C12 and the other end of the capacitor C13 are connected with digital ground DGND; the serial port TXD0 end and RXD0 end of the U10 are connected with a 485 communication module, and the singlechip is communicated with the PC end upper computer through 485 communication; the P1.1 end of the U10 is connected with the SCLK end of the AD chip U11 of the area 2; the P1.2 end of the U10 is connected with the CS end of the AD chip U11 of the area 2; the method comprises the steps of carrying out a first treatment on the surface of the The P1.3 end of the U10 is connected with the DIN end of the AD chip U11 of the area 2, and the P1.4 end of the U10 is connected with the DOUT end of the AD chip U11 of the area 2; the rxd1 end of the U10 is connected with the tx end of the CPLD system; the P2.1 end of the U10 is connected with the rst end of the CPLD system; the P2.0 end of U10 is connected with the read end of CPLD system.
Region 2 is an ADC conversion circuit module; an AD7799 chip is selected as an AD chip of U11, wherein the SCLK end of U11 is connected with P1.1 of the singlechip U10; the CS end of the U11 is connected with P1.2 of the singlechip U10; the DIN end of the U11 is connected with P1.3 of the singlechip U10; the DOUT end of the U11 is connected with P1.4 of the singlechip U10; the AIN1+ end and AIN 1-end of U11 are connected with the current peak value holding circuit respectively; the GND end of the U11 is connected with an analog ground AGND; the AVdd end and the DVdd end of the U11 are connected with the power supply VDD end; the PSW end and the REF end of the U11 are connected with one end of a capacitor C14 and the anode of a zener diode Z10; the REF+ end of the U11 is connected with the other end of the capacitor C14, the negative electrode of the zener diode Z10 and one end of the resistor R11; the other end of the resistor R11 is connected to one end of the power supply VDD.
Fig. 5 is a specific connection diagram of the peak current conversion voltage and peak hold circuit. As shown in fig. 4, the region 3 is a current-switching voltage module in which one end of the current sensor is connected to one end of the resistor R20; the other end of the resistor R20 is connected with one end of the TVS diode Z20 and one end of the resistor R21; the other end of the TVS diode Z20 is connected with the other end of the current sensor and the analog ground AGND end; the other end of the resistor R21 is connected with one end of the resistor R22 and the IN+ end of the operational amplifier U20; the other end of R22 is connected to analog AGND.
The region 4 is a peak hold circuit, in which the OP 20 selects an OP07 chip, which is a high-precision, high-speed, low-noise OP, as a voltage follower. The specific connection mode is that the IN+ end of the U20 is connected with one end of a resistor R21 of the region 3; the IN-end of the U20 is connected with the anode of the diode D20; the VDD end of the U20 is connected with the anode of the capacitor CD20, one end of the capacitor C20 and the power supply VDD end; the other end of the capacitor CD20 is connected with the other end of the capacitor C20 and the analog ground AGND; the VSS end of U20 is connected with one end of a resistor R23 and an analog ground AGND; the/SD end of the U20 is connected with the EN end of the singlechip; the OUT end of the U20 is connected with the cathode of the diode D20, the other end of the R23 and the anode of the diode D21; the cathode of the diode D21 is connected with one end of a resistor R24; the other end of the resistor R24 is connected with one end of the resistor R25, one end of the resistor R26, one end of the capacitor C21, the AIN1+ end of the AD chip and the anode of the capacitor CD 21; the other end of the resistor R26 is connected with the other end of the capacitor C21 and the analog ground AGND end; the negative electrode of the capacitor CD21 is connected with the analog ground AGND end; the other end of the resistor R25 is connected with one end of the resistor R27 and one end of the key S20; the other end of the resistor R27 is connected with the OUT2 end of the high-speed optocoupler chip U21; the other end of the key S20 is connected with the OUT1 end of the high-speed optical coupler U21 and the analog ground AGND; the end A of the U21 is connected with one end of the discharge control end; the C end of the U21 is connected with one end of a resistor R28; the other end of the resistor R28 is connected to the other end of the discharge control terminal.
The operational amplifier U20 in the peak hold circuit is used as a voltage follower to isolate the hold circuit from the signal, and meanwhile, the impedance matching of the front and rear signals can be performed. The TVS tube Z20 in region 3 is mainly used to prevent the peak voltage from being too large and damaging the operational amplifier. R21 and R22 divide the peak signal IN proportion, and a voltage with smaller amplitude is input at the IN+ input end of U20. The diode D21 and the capacitor CD21 after the op-amp U20 form a peak hold circuit. The voltage across the capacitor CD21 can be discharged by the discharge control terminal.
Claims (2)
1. The method for measuring the magnetizing peak current of the magnetizing machine is characterized by comprising the following steps of: a current sensor is connected in series on a loop between the magnetizing machine and the magnetizing coil, capacitor discharge current in the magnetizing machine is transmitted to a measuring circuit of the magnetizing machine, the current of the current sensor is converted into voltage through a current-to-voltage module, the peak value voltage of the current is stored through a peak value holding circuit, and the peak value voltage is read to a singlechip through a low-speed AD detection module for further processing; the other high-speed AD detection module reads the voltage of the current sensor, the CPLD temporarily stores the dynamic characteristics of the magnetizing current in an external RAM system, the CPLD system transmits the data stored in the RAM system to the singlechip after the measurement is finished, and the singlechip corrects the dynamic characteristics of the measured peak current, so that the magnitude and the width of the peak current are calculated.
2. A circuit for implementing the magnetizing peak current measurement method of a magnetizing apparatus according to claim 1, characterized in that: the system comprises a current sensor, a current-to-voltage module, a peak value holding circuit module, a low-speed AD detection module, a high-speed AD detection module, a CPLD, a RAM module and a singlechip;
the current sensor is connected with the current-to-voltage module to output a corresponding voltage signal, and is connected with the high-speed AD detection module; a peak value signal is obtained through a peak value holding circuit and is connected with a low-speed AD detection module; the high-speed AD detection module is connected with the CPLD, the acquired dynamic peak value information is transmitted to the CPLD, the CPLD controls the RAM module to store data, and after the measurement is finished, the CPLD extracts the data in the RAM module and transmits the data to the singlechip; the low-speed AD detection module is connected with the singlechip.
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| CN201811043943.7A CN109085419B (en) | 2018-09-07 | 2018-09-07 | Magnetizing peak current measuring method and device for magnetizing machine |
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| CN201811043943.7A CN109085419B (en) | 2018-09-07 | 2018-09-07 | Magnetizing peak current measuring method and device for magnetizing machine |
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