WO2014171222A1 - 磁気軸受装置、及び該磁気軸受装置を備えた真空ポンプ - Google Patents
磁気軸受装置、及び該磁気軸受装置を備えた真空ポンプ Download PDFInfo
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- WO2014171222A1 WO2014171222A1 PCT/JP2014/056054 JP2014056054W WO2014171222A1 WO 2014171222 A1 WO2014171222 A1 WO 2014171222A1 JP 2014056054 W JP2014056054 W JP 2014056054W WO 2014171222 A1 WO2014171222 A1 WO 2014171222A1
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- electromagnet
- current
- magnetic bearing
- power supply
- voltage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/058—Bearings magnetic; electromagnetic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
- F16C32/0455—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control including digital signal processing [DSP] and analog/digital conversion [A/D, D/A]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0457—Details of the power supply to the electromagnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
- F04D19/042—Turbomolecular vacuum pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
- F16C2360/45—Turbo-molecular pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0489—Active magnetic bearings for rotary movement with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing
Definitions
- the present invention relates to a magnetic bearing device and a vacuum pump provided with the magnetic bearing device, and in particular, omits a DC / DC converter used to obtain a control power supply voltage of the magnetic bearing, thereby reducing the cost of the circuit.
- the present invention relates to a miniaturized magnetic bearing device and a vacuum pump equipped with the magnetic bearing device.
- Magnetic bearings are used in rotating equipment such as turbomolecular pumps used in semiconductor manufacturing processes.
- a conventional magnetic bearing excitation circuit will be described based on a configuration example of a magnetic bearing of a turbo molecular pump.
- FIG. 4 shows a cross-sectional view of a turbo molecular pump as a configuration example of the magnetic bearing.
- the turbo molecular pump includes a rotating body 103 including a plurality of rotating blades 101a, 101b, 101c,... By turbine blades for exhausting gas.
- an upper radial direction electromagnet 105a, a lower radial direction electromagnet 107a, and an axial direction electromagnet 109a are provided to constitute a magnetic bearing. Further, an upper radial direction sensor 105b, a lower radial direction sensor 107b, and an axial direction sensor 109b are provided.
- the upper radial direction electromagnet 105a and the lower radial direction electromagnet 107a are composed of four electromagnets by the electromagnet windings configured as shown in FIG. These four electromagnets are arranged so as to face each other, and constitute a biaxial magnetic bearing in the X-axis direction and the Y-axis direction. *
- one electromagnet is formed by arranging electromagnet windings 111 and 111 wound around two adjacent core convex portions as a pair and having opposite polarities. This electromagnet constitutes one pair with the electromagnets 113 and 113 of the core convex portions facing each other across the rotating body 103, and each attracts the rotating body 103 in the positive or negative direction of the X axis.
- the two electromagnet windings 115 and 115 and the two electromagnet windings 117 and 117 facing the same are also opposed in the Y-axis direction as described above.
- One pair is configured as an electromagnet.
- the axial direction electromagnets 109a and 109a are configured as one pair by two electromagnet windings 121 and 123 sandwiching the armature 103a of the rotating body 103 as shown in FIG.
- the two electromagnets 109a and 109a formed by the electromagnet windings 121 and 123 act to attract the armature 103a in the positive or negative direction of the rotation axis.
- the upper radial direction sensor 105b and the lower radial direction sensor 107b are composed of four sensing coils arranged on the XY2 axes corresponding to the electromagnets 105a and 107a, and detect the radial displacement of the rotating body 103.
- the axial direction sensor 109b detects the axial displacement of the rotating body 103.
- the magnetic bearing control device individually applies the attraction force of a total of ten electromagnets constituting the upper radial electromagnet 105a, the lower radial electromagnet 107a, and the axial electromagnets 109a, 109a by PID control or the like.
- the rotating body 103 is configured to support magnetic levitation.
- FIG. 7 shows an example of a magnetic bearing excitation circuit that controls the current flowing through the electromagnet winding by the pulse width modulation method.
- one end of an electromagnet winding 111 constituting one electromagnet is connected to the positive electrode of the power supply 133 via the transistor 131, and the other end is connected to the negative electrode of the power supply 133 via the transistor 132. . *
- the cathode of the current regeneration diode 135 is connected to one end of the electromagnet winding 111, and the anode is connected to the negative electrode of the power supply 133.
- the cathode of the diode 136 is connected to the positive electrode of the power supply 133, and the anode is connected to the other end of the electromagnet winding 111.
- An electrolytic capacitor 141 is connected between the positive electrode and the negative electrode of the power supply 133 for stabilization.
- a current detection circuit 139 is interposed on the source side of the transistor 132, and a current detected by the current detection circuit 139 is input to the control circuit 137.
- the excitation circuit 110 configured as described above corresponds to the electromagnet winding 111, and the same excitation circuit 110 is configured for the other electromagnet windings 113, 115, 117, 121, and 123. . Therefore, in the case of a 5-axis control type magnetic bearing, a total of ten excitation circuits 110 are connected in parallel with the electrolytic capacitor 141. *
- the current increases when both transistors 131 and 132 are turned on, and the current decreases when both transistors 131 and 132 are turned off.
- the flywheel current is held. By passing the flywheel current, hysteresis loss can be reduced and power consumption can be kept low.
- the control circuit 137 compares the current command value and the detection value by the current detection circuit 139 to determine the pulse width within one cycle by pulse width modulation, and sends a signal to the gates of the transistors 131 and 132.
- both the transistors 131 and 132 are turned off for the time corresponding to the pulse width time Tp only once in one cycle Ts as shown in FIG. At this time, the electromagnet current IL decreases.
- the pulse width Tp is obtained from the current command value IR, the electromagnet current IL, the electromagnet inductance Lm, the electromagnet resistance Rm, and the power supply voltage Vd. According to Kirchhoff's law, Equation 1 is established between the electromagnet current IL flowing through the electromagnet winding 111 and the power supply voltage Vd. *
- the power supply voltage Vd is lowered from the AC input power supply 1 through the AC / DC main power supply 3 and the DC / DC converter 5.
- the power supply voltage Vd is input to the electromagnet power amplifier 7 and used as a power supply for the excitation circuit 110 (see Patent Document 1). *
- the output of the AC / DC main power source 3 is also input to the motor drive circuit 9 and supplied to the motor 121.
- the output of the DC / DC converter 5 is input to the small auxiliary power supply 11 and then generated as a control power supply of 5V, + 15V, ⁇ 15V, etc. and sent to the control circuit 137.
- the control circuit 137 includes a DSP 15 (digital signal processor). *
- the power supply voltage Vd is a voltage that has been lowered through the DC / DC converter 5
- the output voltage of the AC / DC main power supply 3 varies greatly depending on the rotational state of the motor 121 such as acceleration or deceleration.
- the power supply voltage Vd is always stable. Therefore, conventionally, the output of the electromagnet power amplifier 7 can be stably controlled without much consideration of fluctuations in the power supply voltage.
- the DC / DC converter 5 since the DC / DC converter 5 was mounted to obtain the power supply voltage Vd, the cost of the circuit was high and the dimensions were large. In addition, the failure rate was high due to the large number of parts. *
- the present invention has been made in view of such a conventional problem. By omitting the DC / DC converter used to obtain the control power supply voltage of the magnetic bearing, the cost and size of the circuit can be reduced. It is an object of the present invention to provide a magnetic bearing device and a vacuum pump including the magnetic bearing device.
- the present invention includes a rotating body, position detecting means for detecting a radial position or an axial position of the rotating body, and a magnetic bearing for controlling the radial position or the axial position by an electromagnet.
- Means an excitation circuit including a switching element for connecting and disconnecting between the electromagnet and the power source, an electromagnet current detecting unit for detecting a current flowing through the electromagnet, a power source voltage detecting unit for detecting the voltage of the power source, and the switching Pulse width calculating means for calculating a pulse width for pulse-controlling the element at each timing, and the pulse width is obtained by detecting the voltage detected by the power supply voltage detecting means and the current detected by the electromagnet current detecting means. It is calculated based on the basis. *
- the pulse width is calculated based on the voltage of the power supply detected by the power supply voltage detection means and the current detected by the electromagnet current detection means. For this reason, the change of the pulse width can be reduced by the increase of the voltage, and the magnetic bearing control can be stabilized. That is, stability can be ensured by changing the electromagnet amplifier control characteristics in accordance with the power supply voltage.
- the DC / DC converter is omitted, and the electromagnet power amplifier can be driven in a high voltage state. For this reason, the cost and size of the circuit can be reduced. In addition, the failure rate of the circuit can be reduced.
- a first correction calculation is performed based on a current error between the current value of the current detected by the electromagnet current detecting means and a current command value, and based on the current pulse width.
- a second correction calculation is performed, a third correction calculation is performed based on a voltage drop due to the resistance of the electromagnet, and an error of a DC component included in the third correction calculation and the second correction calculation is integrated.
- the correction calculation is performed by the following. *
- An error of direct current generated by performing the second correction calculation and the third correction calculation is corrected by integration. That is, an integral compensation term is added separately from the prediction control loop in order to reduce the direct current error of the current caused by the error in the prediction control of the PWM control pulse width.
- the present invention (Claim 3) is characterized in that the switching frequency for connecting and disconnecting the switching element of the excitation circuit is an even multiple of the carrier frequency of the position detecting means.
- the noise mixed in the position detecting means is suppressed by synchronizing the switching frequency for connecting / disconnecting the switching element of the excitation circuit with twice the carrier frequency of the position detecting means.
- the DC / DC converter is omitted, and stable magnetic bearing control can be performed even when the power supply voltage becomes high.
- the present invention provides a rotating body, position detecting means for detecting a radial position or an axial position of the rotating body, and a magnetic bearing for controlling the radial position or the axial position by an electromagnet.
- an excitation circuit including a switching element for connecting / disconnecting between the electromagnet and the power source, and an electromagnet current detecting means for detecting a current flowing through the electromagnet, wherein the electromagnet current detecting means is on the ground side of the switching element. It is arranged.
- the electromagnet current detection means By arranging the electromagnet current detection means on the ground side of the switching element, even when the power supply voltage is high, it is difficult to be affected by the voltage swing of the electromagnet when detecting the current flowing through the electromagnet. For this reason, an electromagnet current with low noise and low noise can be obtained. Also, since the electromagnet current detection means is arranged on the ground side of the switching element, a high voltage is not applied at the time of current detection, and it is not necessary to use a current measurement means corresponding to the high voltage.
- the electromagnet current detection means is arranged on the ground side of the switching element, so that a noise filter is not used. It is possible to obtain a highly accurate electromagnet current at low cost.
- the DC / DC converter is omitted, and the electromagnet power amplifier can be driven in a high voltage state. For this reason, the cost and size of the circuit can be reduced. In addition, the failure rate of the circuit can be reduced.
- the electromagnet current detecting means comprises at least a resistance element and a differential amplifier, and the voltage across the resistance element caused by a voltage drop of the resistance element due to a current flowing through the electromagnet A current is input to the differential amplifier, and a current flowing through the electromagnet is detected based on an output voltage of the differential amplifier.
- invention 6 is an invention of a vacuum pump, characterized in that it comprises the magnetic bearing device according to any one of claims 1 to 5.
- the vacuum pump can be used in a place with a small installation space.
- the pulse width is calculated based on the power supply voltage detected by the power supply voltage detection means and the current detected by the electromagnet current detection means.
- the change of the pulse width can be reduced by the increased amount, and the magnetic bearing control can be stabilized. That is, stability can be ensured by changing the electromagnet amplifier control characteristics in accordance with the power supply voltage.
- the DC / DC converter is omitted, and the electromagnet power amplifier can be driven in a high voltage state. For this reason, the cost and size of the circuit can be reduced. In addition, the failure rate of the circuit can be reduced.
- FIG. 10 is a conventional general block diagram
- the DC / DC converter 5 conventionally provided is omitted in the embodiment of the present invention.
- the output voltage of the AC / DC main power supply 3 is directly input to the electromagnet power amplifier 7 and the small auxiliary power supply 11 without being lowered.
- the power supply voltage Vd is in a high voltage state of about 120V to 140V.
- the reason why the voltage fluctuates from 120 V during normal operation to about 140 V is that the voltage may increase to about 140 V depending on the regeneration state from the motor 121.
- the power supply voltage Vd which is the output voltage of the AC / DC main power supply 3
- the A / D converter 17 of the control circuit 137 is input to the A / D converter 17 of the control circuit 137 and subjected to analog / digital conversion, and then input to the DSP 15. It is like that.
- the pulse width signal calculated based on the power supply voltage Vd by the DSP 15 of the control circuit 137 is transmitted to the gates of the transistors 131 and 132 shown in the magnetic bearing excitation circuit 110 of the electromagnet power amplifier 7 of FIG. It has become.
- Equation 5 is established from Equation 3 and Equation 4. *
- Equation 7 When the pulse width Tp (n + 1) is recombined, Equation 7 is obtained. *
- KA is a feedback gain
- current command value IR (n + 1) is a current command value at the timing next to timing n
- IL (n) is an electromagnet current value actually measured this time.
- the polarity of P (n + 1) may be set so that the pulse width Tp (n + 1) is positive. Therefore, if P (n + 1)> 0, the mode 1 is set, while if P (n + 1) ⁇ 0, the mode 2 is set. *
- the electromagnet inductance Lm is derived as shown in Equation 8 using the number of coil turns N, the gap length l, the gap area S, and the magnetic permeability ⁇ . *
- the pulse width Tp (n + 1) can be expressed in another form as shown in Equation 9. *
- KL is an inductance correction gain, which is a correction coefficient for correcting the reference value L 0 of the electromagnet inductance based on the magnitude of the detected electromagnet current IL. Since the electromagnet inductance Lm decreases as the steady current value of the electromagnet current IL increases, it is necessary to decrease the inductance correction gain.
- KL The relationship between KL and the electromagnet current IL is shown in FIG.
- the term corresponding to (IR (n + 1) ⁇ IL (n)) ⁇ KL is the current command value IR calculated by the DSP 15 and the actually detected electromagnetic current IL. It has a function of correcting the current error between the two.
- the term corresponding to P (n) ⁇ Vd ⁇ Tp (n) / L 0 which is the second item in Equation 9 is a term that is corrected with the current pulse width and determines the next pulse width.
- the microcomputer performs sampling operation at regular intervals. For this reason, there is a time lag in calculation, and there is a possibility that the current actually flowing between the calculation and the time of the next calculation will change. It has a function of correcting the deviation during that time with the second item of the previous pulse width.
- the correction of the second item may not reflect the calculation result instantaneously at the timing immediately following the current timing. For example, the calculation result may be reflected after calculating several cycles and confirming that there is no influence of noise or the like.
- Equation 9 actually has a resistance component in the electromagnet winding 111, and a voltage drop is caused by the resistance component. For this reason, it has a function of correcting the voltage drop due to the resistance.
- Equation 9 ideally functions as theoretically for the AC component.
- the reference value L 0 and the electromagnet resistance Rm of the electromagnet inductance it is difficult in practice to define precisely, the error from the theoretical value due to manufacturing variations and operating environments choice occurs.
- Yi (n) is obtained by accumulating, at each timing, a value obtained by multiplying the current error between the current command value IR calculated by the DSP 15 and the actually detected electromagnet current IL by Ki. is there. *
- Ki is an integral coefficient shown in Equation 12, and is determined empirically.
- the sampling time Ts is, for example, 40 ⁇ s
- the frequency f is, for example, about 1 hertz.
- the magnetic bearing is controlled by software of the DSP 15.
- the power supply voltage Vd is analog / digital converted by the AD converter 17 and taken into the DSP 15.
- the PWM control pulse width corresponding to the power supply voltage Vd is calculated as shown in Equation 10, and the electromagnet 111 is driven.
- the DC / DC converter is omitted, and the electromagnet power amplifier 7 can also be driven in a high voltage state. For this reason, the cost and size of the circuit can be reduced. In addition, the failure rate of the circuit can be reduced. Further, since the dimensions of the controller and the vacuum pump integrated product can be reduced, the vacuum pump can be employed even in a place with a small installation space. *
- displacement sensors are driven at a carrier frequency of 25 kHz, for example.
- a synchronous detection method for modulating the displacement signal with a rectangular synchronous detection pulse having the same frequency as the carrier frequency is used.
- the influence of the electromagnet current IL on current detection when the DC / DC converter 5 is omitted and the high voltage of the AC / DC main power supply 3 is used as the power supply voltage Vd will be considered.
- the current detection circuit 139 on the ground side of the transistor 132, the voltage swing of the electromagnet 111 can be detected when the electromagnet current IL is detected even when the power supply voltage Vd of the present embodiment is high. Can be less affected. Also, with this arrangement, a high voltage is not applied to the current detection circuit 139, and the current detection circuit 139 does not require a high voltage countermeasure.
- the noise due to the voltage swing applied to the electromagnet 111 is a periodic waveform of the detected electromagnet current, so a noise filter (for example, a low-pass filter) cannot be used to measure an accurate current value.
- a noise filter for example, a low-pass filter
- the voltage extracted from the current detection circuit 139 is not input to the A / D converter as it is when the conventional DC / DC converter 5 is provided, but the current detection interface in the magnetic bearing excitation circuit of FIG. As can be seen, the difference between the voltage once extracted from the current detection circuit 139 by the differential amplifier 27 and the voltage of the ground 21 is taken.
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- General Physics & Mathematics (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
とする。
、2倍波、4倍波・・では逆に感度を有しない。本実施形態の電源電圧Vdは高電圧のため、PWM制御によるノイズの発生もその分従来よりも大きいことが想定される。
Claims (6)
- 回転体と、該回転体の半径方向位置又は軸方向位置を検出する位置検出手段と、該半径方向位置又は該軸方向位置を電磁石により制御する磁気軸受手段と、前記電磁石と電源との間を断接するスイッチング素子を含む励磁回路と、前記電磁石を流れる電流を検出する電磁石電流検出手段と、前記電源の電圧を検出する電源電圧検出手段と、前記スイッチング素子をパルス制御するパルス幅をタイミング毎に演算するパルス幅演算手段とを備え、前記パルス幅が、前記電源電圧検出手段で検出された前記電圧及び前記電磁石電流検出手段で検出された前記電流を基に演算されるものであることを特徴とする磁気軸受装置。
- 前記電磁石電流検出手段で検出された前記電流の電流値と電流指令値との電流誤差に基づき第1の補正演算がされ、現在の前記パルス幅に基づき第2の補正演算がされ、前記電磁石の抵抗分による電圧降下に基づき第3の補正演算がされ、該第3の補正演算と前記第2の補正演算に含まれている直流分の誤差が積分により補正演算されることを特徴とする請求項1記載の磁気軸受装置。
- 前記励磁回路の前記スイッチング素子を断接するスイッチング周波数が前記位置検出手段のキャリア周波数の偶数倍とされたことを特徴とする請求項1又は請求項2記載の磁気軸受装置。
- 回転体と、該回転体の半径方向位置又は軸方向位置を検出する位置検出手段と、該半径方向位置又は該軸方向位置を電磁石により制御する磁気軸受手段と、前記電磁石と電源との間を断接するスイッチング素子を含む励磁回路と、前記電磁石を流れる電流を検出する電磁石電流検出手段とを備え、前記電磁石電流検出手段が前記スイッチング素子のアース側に配置されたことを特徴とする磁気軸受装置。
- 前記電磁石電流検出手段は、少なくとも抵抗素子と差動増幅器からなり、前記電磁石に流れる電流による前記抵抗素子の電圧降下によって生じる前記抵抗素子両端の電圧を前記差動増幅器に入力し、該差動増幅器の出力電圧に基づいて、前記電磁石に流れる電流を検出することを特徴とする請求項1、2、3又は4記載の磁気軸受装置。
- 請求項1~5のいずれか1項に記載の磁気軸受装置を備えたことを特徴とする真空ポンプ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/783,740 US10371159B2 (en) | 2013-04-16 | 2014-03-07 | Magnetic bearing device, and vacuum pump having same |
KR1020157021129A KR102196603B1 (ko) | 2013-04-16 | 2014-03-07 | 자기 베어링 장치, 및 상기 자기 베어링 장치를 구비한 진공 펌프 |
EP14786042.3A EP2988009B1 (en) | 2013-04-16 | 2014-03-07 | Magnetic bearing device, and vacuum pump provided with said magnetic bearing device |
CN201480020398.3A CN105121875B (zh) | 2013-04-16 | 2014-03-07 | 磁力轴承装置和具备该磁力轴承装置的真空泵 |
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JP2013086143A JP6144527B2 (ja) | 2013-04-16 | 2013-04-16 | 磁気軸受装置、及び該磁気軸受装置を備えた真空ポンプ |
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US (1) | US10371159B2 (ja) |
EP (1) | EP2988009B1 (ja) |
JP (1) | JP6144527B2 (ja) |
KR (1) | KR102196603B1 (ja) |
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US10495145B2 (en) * | 2016-04-22 | 2019-12-03 | Ingersoll-Rand Company | Active magnetic bearing controller |
KR102573122B1 (ko) * | 2017-01-06 | 2023-08-30 | 엘지전자 주식회사 | 압축기 구동장치 및 이를 구비한 칠러 |
KR102573123B1 (ko) * | 2017-01-06 | 2023-08-30 | 엘지전자 주식회사 | 압축기 구동장치 및 이를 구비한 칠러 |
JP7148230B2 (ja) * | 2017-08-31 | 2022-10-05 | エドワーズ株式会社 | 真空ポンプ及び制御装置 |
KR102047876B1 (ko) * | 2017-10-24 | 2019-12-02 | 엘지전자 주식회사 | 자기 베어링 제어장치, 제어방법 및 이를 이용한 고속회전용 모터 |
JP7164471B2 (ja) | 2019-03-15 | 2022-11-01 | エドワーズ株式会社 | 制御装置、及び該制御装置を備えた真空ポンプ |
WO2020217407A1 (ja) * | 2019-04-25 | 2020-10-29 | 株式会社島津製作所 | 真空ポンプ |
CN112502960B (zh) * | 2021-02-07 | 2021-04-30 | 天津飞旋科技有限公司 | 磁悬浮制冷压缩机自检系统及方法 |
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- 2014-03-07 US US14/783,740 patent/US10371159B2/en active Active
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Also Published As
Publication number | Publication date |
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US10371159B2 (en) | 2019-08-06 |
EP2988009B1 (en) | 2021-09-01 |
JP2014209016A (ja) | 2014-11-06 |
CN105121875B (zh) | 2019-06-18 |
KR20150140630A (ko) | 2015-12-16 |
EP2988009A4 (en) | 2017-08-30 |
US20160252099A1 (en) | 2016-09-01 |
JP6144527B2 (ja) | 2017-06-07 |
CN105121875A (zh) | 2015-12-02 |
EP2988009A1 (en) | 2016-02-24 |
KR102196603B1 (ko) | 2020-12-30 |
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