CN102109416B - Non-contact electromagnetic loading device for high speed electric spindle - Google Patents

Abstract

The invention discloses a high-speed electric spindle non-contact electromagnetic loading device. The structure of the mechanical part is that an electric spindle is fixed on a support, a mandrel is set in the inner cavity of the electric spindle, and a loading disc is coaxially set at one end of the mandrel. , the outer end of the loading disc is provided with a balance device; the loading disc is provided with an oblique through hole along the axial direction; the overall support is set around the loading disc, and a radial force loading electromagnet is installed on the lower part of the overall support, and a DC excitation coil is wound around it ① and ②; left and right torque loading electromagnets are installed on both sides of the overall bracket, and DC excitation coils ③ and ④ are respectively wound; the structure of the electrical part is that the output terminal of the PWM switching power amplifier is connected with the magnetic field controller and the DC excitation at the same time. The coils ①, ② are connected with ③, ④; the input end of the PWM switching power amplifier is connected with the diode rectification circuit and the rectification transformer in turn, and the magnetic field controller is connected with the industrial computer. The invention solves the problem of difficult loading in the performance analysis test of the high-speed electric spindle.

Description

A high-speed electric spindle non-contact electromagnetic loading device

technical field

The invention belongs to the technical field of power control equipment, and relates to a non-contact electromagnetic loading device for a high-speed electric spindle.

Background technique

As an emerging technology, high-speed electric spindle has been widely used in the processing and manufacturing industry to realize high-speed and high-precision machining of CNC machine tools. In order to improve the machining accuracy and reliability of high-speed CNC machine tools, it is necessary to conduct experimental research on the reliability and dynamic performance of the high-speed electric spindle under load. The test must first solve the loading problem of the high-speed electric spindle. At present, there are few studies on the loading of high-speed electric spindle tests at home and abroad, and the proposed loading method is still the pair-to-drag loading used in low-speed motor loading, that is, the dynamometer as the loading device is coaxially connected with the motor, and the motor spindle Provide load torque, measure the speed, torque and other parameters of the motor spindle. Due to the relatively low speed of ordinary motors, contact loading can meet the requirements, but for high-speed electric spindles, if contact loading is used, a large amount of frictional heat and mechanical wear will be generated during high-speed operation, and it is difficult to achieve loading control and high-speed electric spindles. At the same time, the existing high-speed motorized spindle dragging device still has the following disadvantages: (1) It can only provide the load torque loading of the spindle, but cannot provide the radial force loading of the spindle. (2) Due to the coupling connection, there are problems of mechanical wear, vibration and coaxiality that cannot be accurately guaranteed. The resulting centrifugal force aggravates the vibration and swing of the high-speed electric spindle, so that it cannot be loaded at high speed. Therefore, the test loading of the high-speed electric spindle is not suitable for contact loading.

Contents of the invention

The object of the present invention is to provide a non-contact electromagnetic loading device for a high-speed electric spindle, which solves the problem of difficult loading of a high-speed electric spindle in the prior art.

The technical solution adopted in the present invention is a non-contact electromagnetic loading device for a high-speed electric spindle, including a mechanical part and an electrical part,

The structure of the mechanical part is that a support and an integral support are arranged on the workbench, an electric spindle is fixed on the support, a mandrel is set in the inner cavity of the axis of the electric spindle, and one end of the mandrel extends out of the electric spindle to be coaxial A loading disc is connected, and a balance device is provided on the outer end of the loading disc; the loading disc is provided with an oblique through hole along the axial direction; the integral support is arranged around the loading disc, and the loading disc and the integral support are located at the same In the plane, a radial force loading electromagnet is installed at the lower part of the overall support directly below the vertical direction of the loading disc, the radial force loading electromagnet is a U-shaped electromagnet, and the two ends of the radial force loading electromagnet are respectively wound with DC Excitation coil ① and DC excitation coil ②; right torque loading electromagnet and left torque loading electromagnet are installed on the overall support on both sides of the horizontal side of the loading disk axis, and the right torque loading electromagnet and left torque loading electromagnet are straight iron The core is respectively wound with a DC excitation coil ③ and a DC excitation coil ④, and the coil axes of the DC excitation coil ③ and the DC excitation coil ④ are on the same straight line as the horizontal diameter line of the loading disc;

The structure of the electrical part includes a magnetic field controller, the load test value and the load set value are the input signals of the magnetic field controller; the output end of the magnetic field controller is connected with the control circuit input end of the PWM switching power amplifier, and the PWM switching power The output terminal of the loading circuit of the amplifier is connected with the DC excitation coils ①, ② and ③, ④ at the same time; the input terminal of the PWM switching power amplifier is also connected with the diode rectification circuit and the rectification transformer in turn, and the magnetic field controller is also connected with the industrial computer.

The beneficial effect of the present invention is that it effectively solves the problem that the high-speed electric spindle is difficult to load, and can not only provide the load torque loading of the spindle, but also provide the radial force loading of the spindle; the device is low in cost, easy to install and use, and has high reliability. Significant economic benefits.

Description of drawings

Fig. 1 is the structural representation of device of the present invention;

Fig. 2 is a side view structure diagram of one side of the whole support of the device of the present invention;

Fig. 3 is a partial enlarged view of the loading disc and the balancing device in the device of the present invention;

Fig. 4 is the circuit part connection schematic diagram of device of the present invention;

Fig. 5 is a schematic diagram of the connection structure of four sets of electromagnetic coils in the device of the present invention.

In the figure, 1. Electric spindle, 2. Loading disc, 3. Overall bracket, 4. Slanted through hole, 5. Balance weight, 6. Balance disc, 7. T-shaped slot, 8. Radial force loading electromagnet, 9. Rectifier transformer, 10. Diode rectifier circuit, 11. PWM switching power amplifier, 12. Magnetic field controller, 13. Workbench, 14. Support, 15. Right torque loading electromagnet, 16. Left torque loading electromagnet, 17. Filter capacitor, 18. PWM waveform generator, 19. Isolation drive circuit, 20. Radial force loading circuit, 21. Torque loading circuit, 22. Lock nut, 23. Lock round nut, 24. Flange, 25. Mandrel, ①, ②, ③ and ④ are four DC excitation coils.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1, Fig. 2 and Fig. 3, the structure of the mechanical part of the device of the present invention is that a support 14 and an integral support 3 are arranged on the workbench 13, and the electric spindle 1 is fixed on the support 14, and the axis of the electric spindle 1 A mandrel 25 is set, and one end of the mandrel 25 protruding from the electric spindle 1 is coaxially connected with a flange 24, and the flange 24 is fixedly connected with the mandrel 25 through a lock nut 22, and the loading disc 2 is set on the flange 24. The loading disc 2 and the integral support 3 are located in the same vertical plane, the outer end of the loading disc 2 is provided with a balance disc 6, and a plurality of balance weights 5 are arranged in the T-shaped groove 7 opened along the circumference of the balance disc 6, and the balance disc The outer end of 6 is provided with a locking round nut 23 , and the locking round nut 23 is used to fix the balance disc 6 on the flange 24 , thereby clamping the loading disc 2 on the flange 24 .

Referring to FIG. 3 , the dynamic balance device for loading the disk 2 is to set three balance weights 5 in the annular T-shaped groove 7 of the balance disk 6 , and adjust the dynamic balance by moving the positions of the balance weights 5 . The loading disk 2 is provided with oblique through holes 4 along the axial direction. When the electric spindle rotates at high speed, high-speed air flow can be formed to realize automatic air cooling, which can meet the needs of continuous loading for a long time without adding complicated cooling devices.

Referring to Fig. 2 and Fig. 5, the integral support 3 is a precisely machined frame structure, and the integral support 3 satisfies the requirement of symmetry, and a radial force loading electromagnet 8, a left torque loading electromagnet 16 and a right torque loading electromagnet 8 are installed in the integral support 3. The electromagnet 15, the radial force loading electromagnet 8 located below the loading disk 2 is provided with a DC excitation coil ① and a DC excitation coil ②, and the coil axes of the DC excitation coil ① and the DC excitation coil ② are symmetrical and parallel to the loading disk 2, the left and right sides of the loading disk 2 are provided with a right torque loading electromagnet 15 and a left torque loading electromagnet 16, and a DC excitation coil is respectively wound on the right torque loading electromagnet 15 and the left torque loading electromagnet 16 ③ and the DC excitation coil ④, the coil axes of the DC excitation coil ③ and the DC excitation coil ④ are in the same straight line as the horizontal diameter line of the loading disk 2, and the DC excitation coils ①, ② and ③, ④ respectively form respective DC magnetic fields, By cooperating with the loading disk 2, stable electromagnetic loading force and torque are generated.

With reference to Fig. 1, Fig. 4, the electric control part structure of the present invention is, load test value e and load setting value f are magnetic field controller 12 input signals, and the deviation amount that input signal e and f forms is used as magnetic field controller 12 The input quantity of the PI control algorithm, the output signal generated by the adjustment of the PI control algorithm is connected to the control circuit input end of the pulse width modulation (PWM) switching power amplifier 11, the loading circuit input end of the PWM switching power amplifier 11 and the diode rectifier circuit 10 and the rectifier The transformer 9 is connected in turn, and the output terminal of the loading circuit of the PWM switching power amplifier 11 is connected to the DC excitation coils ①, ② and ③, ④ at the same time, and the DC excitation coils ①, ② and ③, ④ are generated by the PWM switching power amplifier 11. Stable DC excitation current, and the control of the DC excitation current is completed by the magnetic field controller 12; the magnetic field controller 12 is connected with the industrial computer as the upper computer, and the industrial computer can generate a man-machine interactive operation interface to input the set value f of the loading amount and other parameters, The input set value f and other parameters are transmitted to the magnetic field controller 12 through the serial port communication, and the load detection value received by the magnetic field controller 12 is transmitted to the industrial computer for display through the serial port communication.

Referring to Fig. 4, the PWM switching power amplifier 11 is composed of two parts, a loading circuit and a control circuit. The radial force loading circuit 20 and the torque loading circuit 21 with the same circuit structure form the loading circuit part of the PWM switching power amplifier 11; wherein, the output connection ports of the radial force loading circuit 20 are terminal a and terminal b, and the DC excitation coil ① and The DC excitation coil ② is differentially connected in series and connected to terminals a and b, the output wiring ports of the torque loading circuit 21 are terminals c and d, and the DC excitation coil ③ and DC excitation coil ④ are connected in series to terminals c and d; Both the radial force loading circuit 20 and the torque loading circuit 21 use an insulated gate bipolar transistor (IGBT) module from SEMIKRON, the model is SK100GH128T, and the IGBT module of this type is internally composed of two insulated gate bipolar transistors ( IGBT) and two fast recovery diodes (freewheeling diodes) constitute a half-bridge chopper circuit, the half-bridge chopper circuit is packaged into a whole IGBT module, as the loading circuit of the PWM switching power amplifier, with charging, discharging, freewheeling three state, that is, a three-level PWM switching power amplifier, and its output current ripple is very small, which meets the needs of stable loading.

The input ends of the radial force loading circuit 20 and the torque loading circuit 21 are simultaneously connected in parallel with the output end of the diode rectification circuit 10, and the output end of the diode rectification circuit 10 is also connected in parallel with a filter capacitor 17, which can filter out the AC interference signal in the rectified output DC signal , the diode rectifier circuit 10 is a three-phase bridge-type uncontrollable rectifier circuit composed of 6 rectifier diodes of the same type. This circuit selects the rectifier diode group bridge produced by Guangzhou Juxing Company. 9 is connected to the output terminal, and the 9 input terminals of the rectifier transformer are connected to three-phase power frequency alternating current.

The IGBT control poles in the radial force loading circuit 20 and the torque loading circuit 21 are all connected to the output end of the isolation drive circuit 19, and the isolation drive circuit is realized by the HCPL4504 high-speed optocoupler. The radial force loading circuit 20, the torque loading circuit 21 and the IGBT The isolation between the module drive circuits, the drive circuit uses the IGBT dedicated drive integrated chip produced by SEMIKRON, the model is SKH123/12, the input terminal of the isolated drive circuit 19 is connected to the output terminal of the PWM waveform generator 18, the waveform generator Select the voltage-driven pulse width modulation (PWM) control integrated circuit produced by Texas Instruments, the model is TL494, the input terminal of PWM waveform generator 18 is connected with the magnetic field controller 12, and the controller selects the 8-bit single-chip microcomputer produced by ATMEL Company, The model is AT89S8253, which supports online programming; the input of the magnetic field controller 12 is the actual loading test value e and the loading setting value f, and the deviation of the magnetic field controller 12 after comparing the two input values is adjusted by the PI control algorithm A control signal output is generated, and the output control signal generates a PWM waveform output through the waveform generator 18, and the output PWM signal controls the on-off of the IGBT in the radial force loading circuit 20 and the torque loading circuit 21 after isolation drive processing to generate a controllable The DC excitation current forms the required loading force, and this part of the circuit forms the control circuit of the PWM switching power amplifier 11 .

The DC power output by the diode rectifier circuit 10 is respectively connected to the DC excitation coils ①, ② and ③, ④ through the two joints of the radial force loading circuit 20 and the torque loading circuit 21, and the magnitude of the DC excitation current is controlled through PI adjustment to complete the radial Adjustment of the electromagnetic loading force F and torque M. When the power supply of the radial force loading circuit 20 and the torque loading circuit 21 are connected at the same time, the radial loading force F and the torque M are simultaneously generated on the loading disk 2, so that the simultaneous loading of the radial force and the torque is realized.

Referring to Fig. 2, Fig. 4 and Fig. 5, the radial force loading electromagnet 8 is installed on the lower part of the integral support 3 in the vertical direction on one side of the loading disc 2. The electromagnet is a U-shaped electromagnet, and its two ends are respectively connected to DC excitation. Coils ①, ②, the excitation current of the DC excitation coils ①, ② is provided by the a, b connection terminals of the radial force loading circuit 20 of the PWM switching power amplifier 11, forming a uniform air gap magnetic field at I, II, I, II The air-gap magnetic field at II respectively generates a central radial Maxwell electromagnetic force perpendicular to the outer cylindrical surface on the outer cylindrical surface in contact with the magnetically permeable loading disc 2, and synthesizes it into a vertical downward central radial electromagnetic force f _n ; At the same time, since the loading disc 2 rotates in the direction shown in Figure 5, an additional tangential Loren magnetic force f _t will be generated, and f _t will translate to the center of the loading disc 2 to form a horizontal radial force f _t and an additional Torque M ₂ (M ₂ =f _t ·D/2); f _n and f _t combine to form the central total radial electromagnetic force F of the loading disc 2 .

Referring to Fig. 2, Fig. 4, Fig. 5, the right torque loading electromagnet 15 and the left torque loading electromagnet 16 are installed on the integral support 3 on both sides of the loading disk 2 level, the left torque loading electromagnet 16 and the right torque loading electromagnet The gaps between 15 and the loading disc 2 are III and IV in the figure. The two groups of electromagnets are straight iron cores, respectively wound with a DC excitation coil ④ and a DC excitation coil ③, and the excitation current is controlled by the PWM switching power amplifier. The c and d ends of the torque loading circuit 21 of 11 are provided to form a uniform air gap magnetic field at III and IV, and the air gap magnetic field at III and IV interacts with the rotating loading disc 2 to generate Lorentz magnetic forces f _a and f _b , since f _a and f _b are equal and reversed, a loading torque M ₁ is formed on the loading disk 2 (M ₁ =f _a ·D/2+f _b ·D/2); the loading torque M ₁ and the additional The torque M ₂ is synthesized into the total loading torque M; at the same time, the air-gap magnetic fields at III and IV respectively generate a horizontal central radial Maxwell electromagnetic force perpendicular to the outer cylindrical surface on the outer cylindrical surface in contact with the magnetically permeable loading disc 2, And the horizontal center radial Maxwell electromagnetic force in two directions is equal and opposite, and the resultant force is zero.

The preparatory work before the loading of the device of the present invention includes, on the one hand, as shown in Figure 3, the flange 24 is fixed on the mandrel 25 through the lock nut 22, the loading disc 2 and the balance disc 6 are sleeved on the flange 24, and the Fix the locking round nut 23, complete the dynamic balance of the assembly on the dynamic balancing machine, and fix the three balancing weights 5, and clamp the balanced assembly to the electric spindle 1 through the mandrel 25; on the other hand, as shown in Figure 2 , adjust the horizontal and vertical positions of the overall support 3, so that the air gap between the radial force loading electromagnet 8, the right torque loading electromagnet 15, the left torque loading electromagnet 16 and the loading disc 2 is 1mm.

The radial electromagnetic force loading process of the device of the present invention is, with reference to FIGS. . The radial force loading coils ① and ② are connected in series in a differential manner and then connected to the radial force loading circuit 20; according to the differential connection mode, the magnetic fields generated by the coils ① and ② are in the same direction, and a synthetic magnetic field is formed at the air gaps at I and II. Since the radial force loading electromagnet 8 and the loading disc 2 are completely symmetrical after installation and adjustment, the air gaps at I and II are uniform and have the same thickness, both of which are 1mm, so the synthetic magnetic field formed by coils ① and ② at the air gaps I and II equal; because the loading disc 2 is a soft magnetic material with good magnetic permeability, the air gap magnetic field at I and II is generated on the outer cylindrical surface of the loading disc 2 (the contact surface between the air gap and the loading disc) and is perpendicular to the outer cylindrical surface The outer center radial Maxwell electromagnetic force is synthesized into a vertically downward radial electromagnetic force f _n through the center of the disk; at the same time, the loading disk 2 rotates in the direction shown in Figure 5, and the air gaps at I and II Under the action of the magnetic field, a tangential Lorent magnetic force is generated, and synthesized into a horizontal tangential force f _t , which translates f _t to the center of the loaded disc 2 to form a horizontal radial force f _t and an additional torque M ₂ (M ₂ =f _t D/2), when f _n is translated vertically upwards to the center of the circle, then f _n and f _t are synthesized into a radial force F passing through the center of the circle to realize radial electromagnetic force loading; if the radial force is changed along the circumferential direction to load the electromagnet The position of 8 can change the direction of the radial force F.

The torque loading process of the device of the present invention is, referring to Fig. 4 and Fig. 5, turning on the power supply of the frequency converter of the electric spindle 1, and turning on the power supply of the diode rectifier circuit 10 and the torque loading circuit 21 of the PWM switching power amplifier 11. The DC excitation coils ③ and ④ are connected in series to the torque loading circuit 21. Since the left torque loading electromagnet 16 and the right torque loading electromagnet 15 are completely symmetrical after being installed and adjusted relative to the loading disc 2, the air gaps at III and IV are even and The thickness is the same, both are 1mm, so the magnetic fields formed by coils ④ and ③ in the air gaps III and IV are equal; the loading disc 2 rotates at high speed in the direction shown in Figure 5, cutting the air gap magnetic field in III and IV, and the magnetic field in the loading circle An induced current is generated on the outer cylindrical surface of disk 2, and the magnetic field generated by the induced current interacts with the air gap magnetic field at III and IV, and tangential Loren magnetic forces f _a and f _b are generated on the loaded disk 2. According to the electromagnetic coils ③, ④ The direction of the magnetic field and the direction of rotation of the loading disk 2 can determine the directions of the tangential electromagnetic forces f _a and f _b at III and IV. Since the air gap magnetic fields at III and IV are equal, the tangential electromagnetic forces f _a and f _b They are equal in magnitude and opposite in direction, and act together on the loading disc 2 to form a loading torque M ₁ (M ₁ =f _a ·D/2+f _b ·D/2) to realize torque loading; at the same time, gas at III and IV The gap magnetic field generates a horizontal central radial Maxwell electromagnetic force perpendicular to the outer cylindrical surface on the outer cylindrical surface of the magnetically permeable loaded disc 2 (the contact surface between the air gap and the loaded disc), and the central radial electromagnetic force in the two directions is equivalent, In the opposite direction, the resultant force is zero; at this time, the loading disc 2 is only subjected to the tangential electromagnetic force, forming a torque _M1 load.

Gradually adjust the speed of the high-speed electric spindle. When the spindle reaches the required speed, adjust the required radial electromagnetic loading force F and loading torque M through the control device to realize non-contact electromagnetic loading on the high-speed electric spindle.

The control principle of the device of the present invention is that a graphical programming language is used to generate a loading control operation interface on the industrial computer of the loading device control system. The industrial computer is an industrial control computer produced by Taiwan Advantech, the model is IPC-610P. The required radial force and torque loading setting value parameter f are input by the man-machine interactive operation interface and transmitted to the input terminal of the magnetic field controller 12, and serial communication is adopted between the industrial computer and the magnetic field controller 12 to complete data transmission, analysis and show. The load test value e is fed back to the input terminal of the magnetic field controller 12, and a deviation value is formed in the magnetic field controller 12. The controller PI adjustment algorithm generates a control signal output after calculation according to the deviation value, and the output control signal is sent to the PWM waveform generator 18 generates a PWM signal output, the output signal controls the on-off of the IGBT in the radial force loading circuit 20 and the torque loading circuit 21 after the isolation drive circuit 19, and generates a controllable DC excitation current to complete the radial loading force F and loading Adjustment of torque M.

The invention of this device is based on the following considerations: (1) non-contact loading without frictional heat and mechanical wear; (2) overcoming the problem that the traditional drag-type loading can only provide torque loading, the invention can realize high-speed electric spindle radial Force and torque are loaded at the same time; (3) There is no need to consider the problem of coaxiality; (4) The dynamometer is omitted; (5) The guide disc has oblique through holes, which generate high-speed airflow during rotation, which can control the loading disc and electromagnetic Iron dissipates heat, eliminating the need for a cooling system; (6) Simple structure and easy operation.

The beneficial effects of the present invention are: the magnetic field controller 12 of the present invention adjusts the excitation current of the DC excitation coil through the PWM switching power amplifier 11, which is easy to realize the non-contact loading of the high-speed electric spindle, and avoids the coaxiality between the traditional drag-type loading device and the electric spindle Connection, coaxiality cannot be guaranteed during high-speed rotation and the resulting severe vibration and other problems, so that loading cannot be achieved. The present invention adopts the oblique through hole 4 on the end face of the loading disk 2, and utilizes the high-speed air flow generated when the loading disk 2 rotates at high speed to realize the automatic air cooling of the non-contact electromagnetic loading device, which can meet the needs of long-term and continuous loading, and avoids the Problems with traditional loading devices requiring complex cooling systems. The loading device in the present invention has simple structure, high reliability, is easy to install and use, and fully meets the loading requirements of high-speed electric spindle test and dynamic analysis.

Claims (4)

1. high-speed electric main shaft noncontact electromagnetism charger is characterized in that: comprise mechanical part and electric part,

Described mechanical part structure is; Worktable (13) is provided with bearing (14) and integral support (3); Be fixed with electric main shaft (1) on the bearing (14); The axle center inner chamber of electricity main shaft (1) is set with mandrel (25), and the end that mandrel (25) stretches out electric main shaft (1) is coaxially connected with loading disk (2), and the outer end that loads disk (2) is provided with balance device; Load disk (2) and be provided with oblique through hole (4) vertically; Described integral support (3) is around loading disk (2) setting; Load disk (2) and be positioned at same vertical plane with integral support (3); Integral support (3) bottom under loading disk (2) vertical direction is equipped with radial force and loads electromagnet (8); It is the U-shaped electromagnet that radial force loads electromagnet (8), the two ends of radial force loading electromagnet (8) be wound with respectively direct-flow magnet exciting coil 1. with direct-flow magnet exciting coil 2.; Right moment of torsion is installed on the integral support (3) of loading disk (2) horizontal both sides, axle center loads electromagnet (15) and left moment of torsion loading electromagnet (16); Right moment of torsion loads electromagnet (15) and left moment of torsion loading electromagnet (16) is straight iron core; Be wound with respectively direct-flow magnet exciting coil 3. with direct-flow magnet exciting coil 4., 3. direct-flow magnet exciting coil is same straight line with direct-flow magnet exciting coil coil axis 4. with the straight horizontal radial line that loads disk (2);

Described electric part structure is, comprises field controller (12), and heap(ed) capacity test value and heap(ed) capacity setting value are field controller (12) input signal; Field controller (12) output terminal is connected with the control circuit input end of PWM switch power amplifier (11), the loaded circuit output terminal of PWM switch power amplifier (11) simultaneously with direct-flow magnet exciting coil 1., 2. with 3., 4. be connected; The input end of PWM switch power amplifier (11) also is connected with rectifier transformer (9) with diode rectifier circuit (10) successively, and field controller (12) also is connected with industrial computer.

2. high-speed electric main shaft noncontact electromagnetism charger according to claim 1; It is characterized in that: the structure of said balance device is; Outer end loading disk (2) is provided with balancing frame (6); Balancing frame (6) is offered T type groove (7) along circumference, is provided with three abilities in the T type groove (7) along the counterbalance weight (5) that circumferentially moves.

3. high-speed electric main shaft noncontact electromagnetism charger according to claim 1; It is characterized in that: said PWM switch power amplifier (11) is made up of loaded circuit and control circuit two parts, and the loaded circuit in the PWM switch power amplifier (11) comprises radial force loaded circuit (20) and the moment of torsion loaded circuit (21) that structure is consistent;

The input end of radial force loaded circuit (20) and moment of torsion loaded circuit (21) is connected in parallel with diode rectifier circuit (10) output terminal simultaneously, and diode rectifier circuit (10) output terminal also is parallel with filter capacitor (17); IGBT control in radial force loaded circuit (20) and the moment of torsion loaded circuit (21) extremely all is connected with isolated drive circuit (19) output terminal; Isolated drive circuit (19) input end is connected with PWM waveform generator (18) output terminal, and PWM waveform generator (18) input end is connected with field controller (12).

4. high-speed electric main shaft noncontact electromagnetism charger according to claim 3; It is characterized in that: said radial force loaded circuit (20) and moment of torsion loaded circuit (21) are all selected insulated gate bipolar transistor npn npn IGBT module for use; This IGBT inside modules comprises that two insulated gate bipolar transistor npn npns and two fast recovery diodes constitute the half-bridge chopper circuit, and this half-bridge chopper circuit is packaged into whole IGBT module.

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