JP6029708B2 - PWM inverter driven permanent magnet type synchronous motor and control method for ventilation fan - Google Patents
PWM inverter driven permanent magnet type synchronous motor and control method for ventilation fan Download PDFInfo
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Description
図1は、本発明の実施の形態1によるPWMインバータ駆動永久磁石式同期モータの構成を示すブロック図である。図1において、実施の形態1によるPWMインバータ駆動永久磁石式同期モータは、整流平滑回路2と、PWMインバータ主回路3と、永久磁石式同期モータ(以降、単に「同期モータ」と記す)5と、モータトルク制御部20aとを備えている。 Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of a PWM inverter driven permanent magnet synchronous motor according to Embodiment 1 of the present invention. 1, a PWM inverter driven permanent magnet synchronous motor according to Embodiment 1 includes a rectifying / smoothing circuit 2, a PWM inverter main circuit 3, a permanent magnet synchronous motor (hereinafter simply referred to as “synchronous motor”) 5, The motor torque control unit 20a is provided.
交流電源1は、ダイオードブリッジの整流回路2dおよび平滑コンデンサ2cからなる整流平滑回路2にて直流電源に変換され、該直流電源の出力電圧(平滑コンデンサ2cの両端電圧)VdcがPWMインバータ主回路3の正負直流母線に供給される。 First, the PWM inverter main circuit 3 will be described.
The AC power source 1 is converted into a DC power source by a rectifying / smoothing circuit 2 including a diode bridge rectifying circuit 2d and a smoothing capacitor 2c, and an output voltage (a voltage across the smoothing capacitor 2c) Vdc of the DC power source is converted into a PWM inverter main circuit 3 To the positive and negative DC buses.
モータトルク制御部20aは、ゲート駆動回路4と、インバータ制御部7と、モータ電流制御部8と、モータ電流演算部9と、電圧決定部10と、直流母線平均電流検出回路11と、電流位相検出部12と、位相制御部14と、モータ速度演算部15と、誘起電圧位相演算部16とを備えている。ここで、以下の説明で用いる電圧値および電流値は、特別な指定がない場合、実効値であるが、実効値を√2倍した振幅値としてもよい。 Next, the motor torque control unit 20a will be described.
The motor torque control unit 20a includes a gate drive circuit 4, an inverter control unit 7, a motor current control unit 8, a motor current calculation unit 9, a voltage determination unit 10, a DC bus average current detection circuit 11, and a current phase. The detector 12, the phase controller 14, the motor speed calculator 15, and the induced voltage phase calculator 16 are provided. Here, the voltage value and the current value used in the following description are effective values unless otherwise specified, but may be amplitude values obtained by multiplying the effective value by √2.
直流母線平均電流検出回路11、モータ電流演算部9およびモータ電流制御部8の制御系は、モータ巻線5cへ流すモータ電流Imを目標値であるモータ電流指令Im*に近づけるための操作量Iq*(q軸電流指令であり第1の電圧調整成分に対応する。)を生成するモータ電流制御ループを構成している。 <Outline of control system constituting motor torque control unit 20a>
The control system of the DC bus average current detection circuit 11, the motor current calculation unit 9 and the motor current control unit 8 operates the operation amount Iq for bringing the motor current Im flowing through the motor winding 5c closer to the target motor current command Im *. A motor current control loop for generating * (q-axis current command and corresponding to the first voltage adjustment component) is configured.
発生トルクTmに対して必要なモータ電流Imは、永久磁石式非突極の同期モータをモータ巻線5cに生ずる誘起電圧の位相と巻線電流(モータ電流)Imの位相とが一定の位相差となるように制御した場合は、モータ電流Imにトルク定数Ktを乗じ、係数倍したものがモータ発生トルクTmになるという比例関係を利用して求めている。すなわち、モータ電流指令Im*は、欲しいモータ発生トルクTmを係数倍して求めたものである。 <How to set the motor current command Im *>
The required motor current Im with respect to the generated torque Tm has a constant phase difference between the phase of the induced voltage generated in the motor winding 5c and the phase of the winding current (motor current) Im in the permanent magnet type nonsalient synchronous motor. When the control is performed, the motor current Im is multiplied by the torque constant Kt, and the coefficient multiplied is used to obtain the motor generated torque Tm. That is, the motor current command Im * is obtained by multiplying the desired motor generation torque Tm by a factor.
まず、直流母線平均電流検出回路11は、PWMインバータ主回路3の正負直流母線の一方の直流母線に介在させたシャント抵抗器11rと平均化回路11aとで構成される。シャント抵抗器11rは、PWMインバータ主回路3のスイッチング時に直流母線に流れるパルス状の電流を、その電流に比例したパルス状電圧に変換し、平均化回路11aへ伝達する。平均化回路11aは、シャント抵抗器11rから入力されるパルス状電圧を、ローパスフィルタに通してPWMインバータ主回路3の直流母線に流れる電流の平均値(平均電流Idc)相当に変換し、それを直流母線の平均電流フィードバックIdcfとしてモータ電流演算部9へ伝達する。 <About motor current control loop>
First, the DC bus average current detection circuit 11 includes a shunt resistor 11r interposed in one DC bus of the positive and negative DC buses of the PWM inverter main circuit 3 and an averaging circuit 11a. The shunt resistor 11r converts a pulsed current flowing through the DC bus when the PWM inverter main circuit 3 is switched into a pulsed voltage proportional to the current and transmits the pulsed voltage to the averaging circuit 11a. The averaging circuit 11a converts the pulse voltage input from the shunt resistor 11r into a value equivalent to the average value (average current Idc) of the current flowing through the DC bus of the PWM inverter main circuit 3 through the low-pass filter, and converts it. The average current feedback Idcf of the DC bus is transmitted to the motor current calculation unit 9.
√3×Im×Vm×cosφ=Idc×Vdc−Pd
=η×Idc×Vdc ・・・・・(1) The electric power supplied from the PWM inverter main circuit 3 to the synchronous motor 5 is obtained by multiplying the product of the motor voltage Vm (line voltage), the motor current Im (line current), and the motor power factor cosφ by a coefficient √3. The input power of the PWM inverter main circuit 3 is obtained by the product of the DC bus voltage Vdc of the PWM inverter main circuit 3 and the average current Idc of the DC bus. Then, according to the law of energy conservation, the power supplied to the synchronous motor 5 becomes equal to the input power of the PWM inverter main circuit 3 minus the loss Pd of the PWM inverter main circuit 3, and the relationship of the following formula (1) Holds.
√3 × Im × Vm × cos φ = Idc × Vdc−Pd
= Η × Idc × Vdc (1)
Im=η×Idc/(√3×Vm/Vdc×cosφ)
と求まる。 Here, η in Equation (1) is the efficiency of the PWM inverter main circuit 3. Generally, the loss Pd of the PWM inverter main circuit 3 is designed to be as small as several percent of input / output power. Further, the loss Pd of the PWM inverter main circuit 3 is not at all proportional to the increase / decrease in the input / output power, but can be approximated as a constant because of the increase / decrease relationship. That is, the motor current Im is
Im = η × Idc / (√3 × Vm / Vdc × cosφ)
It is obtained.
V1=Vm×√2/√3
となるので、モータ電流Imは、
Im=η×Idc/(3/√2×V1/Vdc×cosφ)
となり、PWMインバータ主回路3の変調率D(D=V1/Vdc)を用いて
Im=Idc/(D×cosφ)×η×√2/3 ・・・・・(2)
と表される。 The relationship between the line voltage Vm (applied voltage) and the amplitude V1 of the phase voltage is
V1 = Vm × √2 / √3
Therefore, the motor current Im is
Im = η × Idc / (3 / √2 × V1 / Vdc × cosφ)
Using the modulation factor D (D = V1 / Vdc) of the PWM inverter main circuit 3, Im = Idc / (D × cos φ) × η × √2 / 3 (2)
It is expressed.
Imf=Idcf/(D*×cos(φ*))×η×√2/3 ・・・・(3)
と近似算出し、電流偏差算出部8dへ伝達する。 Therefore, the motor current calculation unit 9 calculates the motor current feedback Imf and the average current feedback Idcf of the DC bus at the phase difference specified by the modulation factor command D * (D * = V1 * / Vdc) and the phase difference command φ *. Multiply the product by the product of the motor power factor command cos (φ *) and multiply by the coefficient.
Imf = Idcf / (D * × cos (φ *)) × η × √2 / 3 (3)
Is approximated and transmitted to the current deviation calculator 8d.
まず、電流位相検出部12は、同期モータ5の相電流位相検出手段であり、電流極性検出回路12dと位相差検出部12cとを備えている。電流極性検出回路12dは、PWMインバータ主回路3の3相のスイッチング回路の1つの相での電流極性を検出する。図1では、U相電流の極性を検出し、極性信号VUPとして位相差検出部12cへ出力する。位相差検出部12cは、位置センサ6からの位置センサ信号VHUと、電流極性検出回路12dからの相電流極性信号VUPとに基づいて、同期モータ5の誘起電圧と該当相電流Imとの位相差θihを演算する。 <About the phase control loop>
First, the current phase detector 12 is a phase current phase detector of the synchronous motor 5, and includes a current polarity detector 12d and a phase difference detector 12c. The current polarity detection circuit 12d detects the current polarity in one phase of the three-phase switching circuit of the PWM inverter main circuit 3. In FIG. 1, the polarity of the U-phase current is detected and output to the phase difference detection unit 12c as the polarity signal VUP. The phase difference detection unit 12c is based on the position sensor signal VHU from the position sensor 6 and the phase current polarity signal VUP from the current polarity detection circuit 12d, and the phase difference between the induced voltage of the synchronous motor 5 and the corresponding phase current Im. θih is calculated.
位相差目標値θih*が、同期モータ5の相誘起電圧と該当相電流との位相差が零となる設定の場合に、同期モータ5のトルク定数Ktが最も大きくなり、効率もよくなる。しかし、同時に最高回転数が最も低くなる。したがって、位相差目標値θih*は、必ずしも零となる設定である必要はなく、例えば相電流の位相を進めて最大回転数を引き上げる設定とすることも可能であるが、その場合にはモータ電流フィードバックImfを求める式(3)のモータ力率指令の位相差指令φ*を進み位相角度分減算してやる必要がある。位相差目標値θih*は、そのようにして設定されている。 <Regarding phase difference target value θih *>
When the phase difference target value θih * is set such that the phase difference between the phase induced voltage of the synchronous motor 5 and the corresponding phase current becomes zero, the torque constant Kt of the synchronous motor 5 becomes the largest and the efficiency is improved. However, at the same time, the maximum rotational speed is the lowest. Therefore, the phase difference target value θih * does not necessarily have to be set to zero. For example, the phase difference target value θih * may be set to increase the maximum rotational speed by advancing the phase of the phase current. It is necessary to advance the phase difference command φ * of the motor power factor command of Equation (3) for obtaining the feedback Imf and subtract the phase angle command. The phase difference target value θih * is set in this way.
電圧決定部10は、電圧演算部10cと振幅演算部10aと位相差演算部10pと電圧位相算出部10bとを備えている。電圧演算部10cには、d軸電流指令Id*とq軸電流指令Iq*との他に、モータ速度演算部15から3つのセンサ信号の発生間隔を測定して求められたモータ回転速度ωrがフィードバック信号として入力される。 <About the voltage determination unit 10>
The voltage determination unit 10 includes a voltage calculation unit 10c, an amplitude calculation unit 10a, a phase difference calculation unit 10p, and a voltage phase calculation unit 10b. In addition to the d-axis current command Id * and the q-axis current command Iq *, the voltage calculation unit 10c includes a motor rotation speed ωr obtained by measuring the generation intervals of three sensor signals from the motor speed calculation unit 15. Input as feedback signal.
Vd*=r・Id*−ωr・L・Iq* ・・・・・・・(4)
Vq*=r・Iq*+ωr・L・Id*+ωr・Ke ・・・・(5) The voltage calculation unit 10c uses the q-axis current command Iq *, the d-axis current command Id *, and the motor rotation speed ωr according to the voltage model formulas shown in the following formulas (4) and (5), Vq * and d-axis voltage command Vd * are calculated. In equations (4) and (5), r is the winding resistance, L is the inductance of the winding, and Ke is an induced voltage constant, which is a constant unique to the motor. The induced voltage constant Ke coincides with the torque constant Kt in the same unit system.
Vd * = r · Id * −ωr · L · Iq * (4)
Vq * = r · Iq * + ωr · L · Id * + ωr · Ke (5)
V1*=√{(Vd*)2+(Vq*)2} ・・・・・・・(6) The amplitude calculation unit 10a uses the q-axis voltage command Vq * and the d-axis voltage command Vd *, and the amplitude of the applied voltage Vm necessary to generate the desired phase voltage amplitude V1 by the following equation (6). An amplitude command V1 * for commanding a value is obtained.
V1 * = √ {(Vd *) 2 + (Vq *) 2 } (6)
φ*=tan−1(−Vd*/Vq*) ・・・・・・・(7) The phase difference calculation unit 10p uses the q-axis voltage command Vq * and the d-axis voltage command Vd * to calculate the applied voltage Vm necessary for generating the desired phase voltage amplitude V1 according to the following equation (7). Find the phase difference command φ *.
φ * = tan−1 (−Vd * / Vq *) (7)
θv*=θr+φ* ・・・・・・・・・・・・(8) The voltage phase calculation unit 10b uses the phase difference command φ * of the applied voltage Vm and the induced voltage phase θr from the induced voltage phase calculation unit 16 to calculate the phase command θv * of the applied voltage Vm by the following equation (8). Ask.
θv * = θr + φ * (8)
インバータ制御部7は、3相電圧演算部7cとPWM変調回路7mとを備えている。3相電圧演算部7cは、以上のように電圧決定部10にて求められた印加電圧Vmの振幅指令V1*および位相指令θv*を用いて、静止座標上の互いに120度の位相差を有する各相印加電圧指令Vu,Vv,Vwを生成し、PWM変調回路7mへ出力する。PWM変調回路7mは、各相印加電圧指令Vu,Vv,Vwに応じたパルス幅変調を行い、PWMインバータ主回路3を駆動するための駆動信号をゲート駆動回路4へ出力する。 <Inverter control unit 7>
The inverter control unit 7 includes a three-phase voltage calculation unit 7c and a PWM modulation circuit 7m. The three-phase voltage calculation unit 7c has a phase difference of 120 degrees on the stationary coordinates using the amplitude command V1 * and the phase command θv * of the applied voltage Vm obtained by the voltage determination unit 10 as described above. Each phase applied voltage command Vu, Vv, Vw is generated and output to the PWM modulation circuit 7m. The PWM modulation circuit 7m performs pulse width modulation according to the phase application voltage commands Vu, Vv, and Vw, and outputs a drive signal for driving the PWM inverter main circuit 3 to the gate drive circuit 4.
図2は、本発明の実施の形態2によるPWMインバータ駆動永久磁石式同期モータの構成を示すブロック図である。なお、図2では、図1(実施の形態1)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、この実施の形態2に関わる部分を中心に説明する。 Embodiment 2. FIG.
FIG. 2 is a block diagram showing a configuration of a PWM inverter driven permanent magnet synchronous motor according to the second embodiment of the present invention. In FIG. 2, the same reference numerals are given to components that are the same as or equivalent to the components shown in FIG. 1 (Embodiment 1). Here, the description will be focused on the portion related to the second embodiment.
図3は、本発明の実施の形態3によるPWMインバータ駆動永久磁石式同期モータの構成を示すブロック図である。なお、図3では、図1(実施の形態1)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、この実施の形態3に関わる部分を中心に説明する。 Embodiment 3 FIG.
FIG. 3 is a block diagram showing a configuration of a PWM inverter driven permanent magnet synchronous motor according to Embodiment 3 of the present invention. In FIG. 3, the same reference numerals are given to components that are the same as or equivalent to those shown in FIG. 1 (Embodiment 1). Here, the description will be focused on the portion related to the third embodiment.
図4は、本発明の実施の形態4によるPWMインバータ駆動永久磁石式同期モータの構成を示すブロック図である。なお、図4では、図2(実施の形態2)に示した構成要素と同一ないしは同等である構成要素には同一の符号が付されている。ここでは、この実施の形態4に関わる部分を中心に説明する。 Embodiment 4 FIG.
FIG. 4 is a block diagram showing the configuration of a PWM inverter driven permanent magnet synchronous motor according to Embodiment 4 of the present invention. In FIG. 4, the same or similar components as those shown in FIG. 2 (Embodiment 2) are denoted by the same reference numerals. Here, the description will be focused on the portion related to the fourth embodiment.
図5は、本発明の実施の形態5として、実施の形態1〜4に示したPWMインバータ駆動永久磁石式同期モータを用いて、負荷トルクに応じてモータ回転速度が変化する誘導モータのような制御特性を実現する構成例を示すブロック図である。 Embodiment 5. FIG.
FIG. 5 shows a fifth embodiment of the present invention such as an induction motor that uses the PWM inverter driven permanent magnet synchronous motor shown in the first to fourth embodiments and whose motor rotation speed changes according to the load torque. It is a block diagram which shows the structural example which implement | achieves a control characteristic.
図8は、本発明の実施の形態6として、実施の形態1〜4に示したPWMインバータ駆動永久磁石式同期モータを用いて、負荷トルクに応じてモータ回転速度が変化する誘導モータのような制御特性を実現する他の構成例を示すブロック図である。 Embodiment 6 FIG.
FIG. 8 shows a sixth embodiment of the present invention, such as an induction motor that uses the PWM inverter driven permanent magnet type synchronous motor shown in the first to fourth embodiments and changes the motor rotation speed in accordance with the load torque. It is a block diagram which shows the other structural example which implement | achieves a control characteristic.
図9は、本発明の実施の形態7として、図8に示すPWMインバータ駆動永久磁石式同期モータを搭載した換気送風機の外観構成例を示す側面図である。なお、以下に説明する内容は、実施の形態1〜5に示すPWMインバータ駆動永久磁石式同期モータを搭載した換気送風機にも同様に適用できる内容である。 Embodiment 7 FIG.
FIG. 9 is a side view showing an external configuration example of a ventilation fan mounted with the PWM inverter drive permanent magnet synchronous motor shown in FIG. 8 as Embodiment 7 of the present invention. In addition, the content demonstrated below is the content applicable similarly to the ventilation air blower which mounts the PWM inverter drive permanent magnet type synchronous motor shown in Embodiment 1-5.
TL=ρ・Q・D・cθ/2 ・・・・・(9)
と表される。 First, the relationship between the air volume of a ventilation fan using a centrifugal impeller and load torque will be described with reference to FIG. FIG. 10 is a view showing a cross section of a blade portion of a centrifugal impeller. In FIG. 10, the load torque TL acting on the centrifugal impeller 27 is obtained by using the density ρ of the working fluid, the volume air volume Q, the diameter D of the impeller, and the swirl velocity component c θ of the absolute wind speed. ρ ・ Q ・ D ・ c θ / 2 (9)
It is expressed.
cθ=u−cr/tanβ ・・・・(10)
u=π・D・ωr ・・・・・(11)
cr=Q/(π・D・b) ・・・・・(12)
TL=ρ・(π・D2・Q・ωr―Q2/(π・b・tanβ))/2・・(13) Here, the peripheral speed u of the impeller outlet, and the relative outflow angle β between the direction of the direction and the tangential velocity w of the peripheral speed u, and the rotational speed .omega.r, and the radial velocity c r in the impeller exit , The swirl velocity component c θ of the absolute wind speed is expressed by Equation (10), and the peripheral velocity u of the impeller outlet is expressed by Equation (11). Since the radial speed cr is expressed by Expression (12), the load torque TL shown in Expression (9) is expressed by Expression (13).
c θ = u−c r / tan β (10)
u = π · D · ωr (11)
c r = Q / (π · D · b) (12)
TL = ρ · (π · D 2 · Q · ωr−Q 2 / (π · b · tan β)) / 2 ·· (13)
この実施の形態8では、以上説明した各実施の形態によるPWMインバータ駆動永久磁石式同期モータの負荷状態を外部でモニタする構成例について説明する。 Embodiment 8 FIG.
In the eighth embodiment, a configuration example for externally monitoring the load state of the PWM inverter driven permanent magnet type synchronous motor according to each of the embodiments described above will be described.
PWMインバータ主回路3の上アームスイッチング素子(T1,T2,T3)と下アームスイッチング素子素子(T4,T5,T6)とがスイッチング動作の遅れにより同時に導通して正極および負極の直流母線間を短絡するのを防ぐために、ゲート駆動回路4にて上アームと下アームとの導通を切り替えるときに、両方同時にオフする期間が設けられている。この期間は、一般にデッドタイムTdと呼ばれているが、このデッドタイムTdの期間中のモータへの印加電圧V1は、変調率指令D*と無関係に、モータ電流がモータ巻線5cからPWMインバータ主回路3へ流入している期間は上アームの還流ダイオード(D1,D2,D3)が導通してモータ巻線5cには正極が印加される。逆に、モータ電流がPWMインバータ主回路3からモータ巻線5cへ流出している期間は下アームの還流ダイオード(D4,D5,D6)が導通してモータ巻線5cには負極が印加される。そのために、変調率指令D*と実際の変調率Dとの間に誤差が生ずる。したがって、式(2)で算出されるモータ電流Imと、式(3)で算出されるモータ電流フィードバックImfとの間に誤差が生じ、結果としてモータトルクの制御精度が悪くなる。この誤差を減らすには、スイッチング素子T1〜T6のスイッチング速度を早くしてデッドタイムTdを極力短くすればよい。つまり、スイッチング素子T1〜T6にSiC−MOSFETを用いることで、式(2)に用いている変調率Dの誤差を減らすことができる。 Here, an error between the modulation rate D and the modulation rate command D * used in the equations (2) and (3) will be described.
The upper arm switching elements (T1, T2, T3) and the lower arm switching element (T4, T5, T6) of the PWM inverter main circuit 3 are simultaneously turned on due to the delay of the switching operation, and the positive and negative DC buses are short-circuited. In order to prevent this, when the conduction between the upper arm and the lower arm is switched in the gate drive circuit 4, a period in which both are turned off simultaneously is provided. This period is generally referred to as dead time Td. The voltage V1 applied to the motor during this dead time Td is equal to the motor current from the motor winding 5c to the PWM inverter regardless of the modulation factor command D *. During the period of flowing into the main circuit 3, the upper arm free wheel diodes (D1, D2, D3) are turned on, and the positive electrode is applied to the motor winding 5c. Conversely, during the period in which the motor current flows from the PWM inverter main circuit 3 to the motor winding 5c, the lower arm freewheeling diodes (D4, D5, D6) conduct and the negative polarity is applied to the motor winding 5c. . For this reason, an error occurs between the modulation rate command D * and the actual modulation rate D. Therefore, an error occurs between the motor current Im calculated by the equation (2) and the motor current feedback Imf calculated by the equation (3), and as a result, the control accuracy of the motor torque is deteriorated. In order to reduce this error, the dead time Td may be shortened as much as possible by increasing the switching speed of the switching elements T1 to T6. That is, by using the SiC-MOSFET for the switching elements T1 to T6, the error of the modulation factor D used in the equation (2) can be reduced.
2 整流平滑回路
3 PWMインバータ主回路
4 ゲート駆動回路
5 永久磁石式同期モータ(同期モータ)
6 位置センサ
7 インバータ制御部
8 モータ電流制御部
9 モータ電流演算部
10 電圧決定部
11 直流母線平均電流検出回路
12 電流位相検出部
13 直流母線平均電流制御部
14 位相制御部
15 モータ速度演算部
16 誘起電圧位相演算部
17 平均電流指令演算部
18 速度制御部
19a,19b モータ電流指令生成部
20,20a,20b,20c,20d モータトルク制御部
23 ノッチ指令生成部
24 ノッチ切替スイッチ
25 電源スイッチ
26 PWMインバータ駆動永久磁石式同期モータ
27 遠心式羽根車
28 ケーシング DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectification smoothing circuit 3 PWM inverter main circuit 4 Gate drive circuit 5 Permanent magnet type synchronous motor (synchronous motor)
6 Position Sensor 7 Inverter Control Unit 8 Motor Current Control Unit 9 Motor Current Calculation Unit 10 Voltage Determination Unit 11 DC Bus Average Current Detection Circuit 12 Current Phase Detection Unit 13 DC Bus Average Current Control Unit 14 Phase Control Unit 15 Motor Speed Calculation Unit 16 Induced voltage phase calculation unit 17 Average current command calculation unit 18 Speed control unit 19a, 19b Motor current command generation unit 20, 20a, 20b, 20c, 20d Motor torque control unit 23 Notch command generation unit 24 Notch switch 25 Power switch 26 PWM Inverter-driven permanent magnet synchronous motor 27 Centrifugal impeller 28 Casing
Claims (7)
- 永久磁石式同期モータと、交流電源を直流電源へ変換する整流平滑回路と、前記直流電源の出力電圧をスイッチングすることにより前記永久磁石式同期モータに可変電圧・可変周波数の交流電力を供給するPWMインバータ主回路と、前記PWMインバータ主回路を制御するモータトルク制御部とを備えるPWMインバータ駆動永久磁石式同期モータであって、
前記モータトルク制御部は、
前記永久磁石式同期モータの回転子の磁極位置を検出する位置センサからの位置センサ信号に基づき前記永久磁石式同期モータの回転速度を演算するモータ速度演算部と、
前記PWMインバータ主回路の直流母線に流出入する電流を検出し平均電流を求める直流母線平均電流検出回路と、
前記平均電流を前記PWMインバータ主回路の変調率および前記永久磁石式同期モータの力率に相当する値で除算し、係数倍して求めたモータ電流フィードバック値を出力するモータ電流演算部と、
前記永久磁石式同期モータの巻線に流す電流の目標値であるモータ電流指令値と前記モータ電流フィードバック値との電流偏差を算出する電流偏差算出部および前記電流偏差がなくなるように指令する第1の電圧調整成分を演算出力する電流制御アンプを有するモータ電流制御部と、
前記PWMインバータ主回路のスイッチング回路を流れる相電流の位相と前記位置センサ信号から得られる該当相誘起電圧の位相との位相差を検出する電流位相検出部と、
前記位相差が位相差目標値に近づくように指令する第2の電圧調整成分を演算出力する位相制御部と、
前記第1および第2の電圧調整成分と前記モータ速度演算部が求めたモータ回転速度とに基づいて、前記PWMインバータ主回路の出力電圧の振幅および位相をそれぞれ決定する電圧決定部と、
前記電圧決定部により決定された振幅および位相を有する出力電圧を前記永久磁石式同期モータへ供給するように前記PWMインバータ主回路を制御するインバータ制御部と、
を備え、
前記PWMインバータ主回路を構成するスイッチング素子は、ワイドギャップ半導体素材を使用したMOSFETである
ことを特徴とするPWMインバータ駆動永久磁石式同期モータ。 A permanent magnet type synchronous motor, a rectifying / smoothing circuit for converting an AC power source into a DC power source, and a PWM for supplying AC power of variable voltage / variable frequency to the permanent magnet type synchronous motor by switching the output voltage of the DC power source. A PWM inverter driven permanent magnet synchronous motor comprising an inverter main circuit and a motor torque control unit for controlling the PWM inverter main circuit,
The motor torque control unit
A motor speed calculation unit for calculating a rotation speed of the permanent magnet type synchronous motor based on a position sensor signal from a position sensor for detecting a magnetic pole position of a rotor of the permanent magnet type synchronous motor;
A DC bus average current detection circuit for detecting the current flowing into and out of the DC bus of the PWM inverter main circuit and obtaining an average current;
Dividing the average current by a value corresponding to the modulation factor of the PWM inverter main circuit and the power factor of the permanent magnet synchronous motor, and outputting a motor current feedback value obtained by multiplying by a coefficient;
A current deviation calculation unit that calculates a current deviation between a motor current command value that is a target value of a current that flows through the winding of the permanent magnet synchronous motor and the motor current feedback value, and a first command that eliminates the current deviation. A motor current control unit having a current control amplifier that calculates and outputs the voltage adjustment component of
A current phase detector for detecting a phase difference between a phase of a phase current flowing through the switching circuit of the PWM inverter main circuit and a phase of a corresponding phase induced voltage obtained from the position sensor signal;
A phase controller that calculates and outputs a second voltage adjustment component that commands the phase difference to approach the phase difference target value;
A voltage determination unit that determines the amplitude and phase of the output voltage of the PWM inverter main circuit based on the first and second voltage adjustment components and the motor rotation speed obtained by the motor speed calculation unit;
An inverter control unit for controlling the PWM inverter main circuit so as to supply an output voltage having an amplitude and a phase determined by the voltage determination unit to the permanent magnet synchronous motor ;
Equipped with a,
The PWM inverter driven permanent magnet synchronous motor, wherein the switching element constituting the PWM inverter main circuit is a MOSFET using a wide gap semiconductor material . - 永久磁石式同期モータと、交流電源を直流電源へ変換する整流平滑回路と、前記直流電源の出力電圧をスイッチングすることにより前記永久磁石式同期モータに可変電圧・可変周波数の交流電力を供給するPWMインバータ主回路と、前記PWMインバータ主回路を制御するモータトルク制御部とを備えるPWMインバータ駆動永久磁石式同期モータであって、
前記モータトルク制御部は、
前記永久磁石式同期モータの回転子の磁極位置を検出する位置センサからの位置センサ信号に基づき前記永久磁石式同期モータの回転速度を演算するモータ速度演算部と、
前記PWMインバータ主回路の直流母線に流出入する電流を検出し平均電流を求める直流母線平均電流検出回路と、
前記永久磁石式同期モータの巻線に流す電流の目標値であるモータ電流指令値に前記PWMインバータ主回路の変調率および前記永久磁石式同期モータの力率に相当する値を乗算し、係数倍して求めた平均電流指令値を出力する平均電流指令演算部と、
前記平均電流指令値と前記直流母線平均電流検出回路が検出した平均電流との電流偏差を算出する電流偏差算出部および前記電流偏差がなくなるように指令する第1の電圧調整成分を演算出力する電流制御アンプを有するモータ電流制御部と、
前記PWMインバータ主回路のスイッチング回路を流れる相電流の位相と前記位置センサ信号から得られる該当相誘起電圧の位相との位相差を検出する電流位相検出部と、
前記位相差が位相差目標値に近づくように指令する第2の電圧調整成分を演算出力する位相制御部と、
前記第1および第2の電圧調整成分と前記モータ速度演算部が求めたモータ回転速度とに基づいて、前記PWMインバータ主回路の出力電圧の振幅および位相をそれぞれ決定する電圧決定部と、
前記電圧決定部により決定された振幅および位相を有する出力電圧を前記永久磁石式同期モータへ供給するように前記PWMインバータ主回路を制御するインバータ制御部と
を備え、
前記PWMインバータ主回路を構成するスイッチング素子は、ワイドギャップ半導体素材を使用したMOSFETである
ことを特徴とするPWMインバータ駆動永久磁石式同期モータ。 A permanent magnet type synchronous motor, a rectifying / smoothing circuit for converting an AC power source into a DC power source, and a PWM for supplying AC power of variable voltage / variable frequency to the permanent magnet type synchronous motor by switching the output voltage of the DC power source. A PWM inverter driven permanent magnet synchronous motor comprising an inverter main circuit and a motor torque control unit for controlling the PWM inverter main circuit,
The motor torque control unit
A motor speed calculation unit for calculating a rotation speed of the permanent magnet type synchronous motor based on a position sensor signal from a position sensor for detecting a magnetic pole position of a rotor of the permanent magnet type synchronous motor;
A DC bus average current detection circuit for detecting the current flowing into and out of the DC bus of the PWM inverter main circuit and obtaining an average current;
Multiply the motor current command value, which is the target value of the current flowing through the winding of the permanent magnet synchronous motor, by the value corresponding to the modulation factor of the PWM inverter main circuit and the power factor of the permanent magnet synchronous motor, and multiply the coefficient An average current command calculation unit that outputs the average current command value obtained by
A current deviation calculation unit that calculates a current deviation between the average current command value and the average current detected by the DC bus average current detection circuit, and a current that calculates and outputs a first voltage adjustment component that commands the current deviation to disappear. A motor current control unit having a control amplifier;
A current phase detector for detecting a phase difference between a phase of a phase current flowing through the switching circuit of the PWM inverter main circuit and a phase of a corresponding phase induced voltage obtained from the position sensor signal;
A phase controller that calculates and outputs a second voltage adjustment component that commands the phase difference to approach the phase difference target value;
A voltage determination unit that determines the amplitude and phase of the output voltage of the PWM inverter main circuit based on the first and second voltage adjustment components and the motor rotation speed obtained by the motor speed calculation unit;
An inverter control unit for controlling the PWM inverter main circuit so as to supply an output voltage having an amplitude and phase determined by the voltage determination unit to the permanent magnet synchronous motor;
With
The PWM inverter driven permanent magnet synchronous motor, wherein the switching element constituting the PWM inverter main circuit is a MOSFET using a wide gap semiconductor material . - 前記ワイドギャップ半導体素材はシリコンカーバイトであることを特徴とする請求項1又は2に記載のPWMインバータ駆動永久磁石式同期モータ。 3. The PWM inverter driven permanent magnet synchronous motor according to claim 1, wherein the wide gap semiconductor material is silicon carbide.
- 遠心式羽根車を備え、PWMインバータ駆動永久磁石式同期モータが搭載された換気送風機の制御方法であって、A control method for a ventilation fan equipped with a centrifugal impeller and equipped with a PWM inverter driven permanent magnet synchronous motor,
前記PWMインバータ駆動永久磁石式同期モータは、The PWM inverter driven permanent magnet synchronous motor is
永久磁石式同期モータと、A permanent magnet synchronous motor;
交流電源を直流電源へ変換する整流平滑回路と、前記直流電源の出力電圧をスイッチングすることにより前記永久磁石式同期モータに可変電圧・可変周波数の交流電力を供給するPWMインバータ主回路と、A rectifying / smoothing circuit for converting an AC power source to a DC power source, a PWM inverter main circuit for supplying AC power of variable voltage / variable frequency to the permanent magnet type synchronous motor by switching the output voltage of the DC power source,
前記PWMインバータ主回路を制御するモータトルク制御部と、を備え、A motor torque control unit for controlling the PWM inverter main circuit,
前記モータトルク制御部は、The motor torque control unit
前記永久磁石式同期モータの回転子の磁極位置を検出する位置センサからの位置センサ信号に基づき前記永久磁石式同期モータの回転速度を演算するモータ速度演算部と、A motor speed calculation unit for calculating a rotation speed of the permanent magnet type synchronous motor based on a position sensor signal from a position sensor for detecting a magnetic pole position of a rotor of the permanent magnet type synchronous motor;
前記PWMインバータ主回路の直流母線に流出入する電流を検出し平均電流を求める直流母線平均電流検出回路と、A DC bus average current detection circuit for detecting the current flowing into and out of the DC bus of the PWM inverter main circuit and obtaining an average current;
前記平均電流を前記PWMインバータ主回路の変調率および前記永久磁石式同期モータの力率に相当する値で除算し、係数倍して求めたモータ電流フィードバック値を出力するモータ電流演算部と、Dividing the average current by a value corresponding to the modulation factor of the PWM inverter main circuit and the power factor of the permanent magnet synchronous motor, and outputting a motor current feedback value obtained by multiplying by a coefficient;
前記永久磁石式同期モータの巻線に流す電流の目標値であるモータ電流指令値と前記モータ電流フィードバック値との電流偏差を算出する電流偏差算出部および前記電流偏差がなくなるように指令する第1の電圧調整成分を演算出力する電流制御アンプを有するモータ電流制御部と、A current deviation calculation unit that calculates a current deviation between a motor current command value that is a target value of a current that flows through the winding of the permanent magnet synchronous motor and the motor current feedback value, and a first command that eliminates the current deviation. A motor current control unit having a current control amplifier that calculates and outputs the voltage adjustment component of
前記PWMインバータ主回路のスイッチング回路を流れる相電流の位相と前記位置センサ信号から得られる該当相誘起電圧の位相との位相差を検出する電流位相検出部と、A current phase detector for detecting a phase difference between a phase of a phase current flowing through the switching circuit of the PWM inverter main circuit and a phase of a corresponding phase induced voltage obtained from the position sensor signal;
前記位相差が位相差目標値に近づくように指令する第2の電圧調整成分を演算出力する位相制御部と、A phase controller that calculates and outputs a second voltage adjustment component that commands the phase difference to approach the phase difference target value;
前記第1および第2の電圧調整成分と前記モータ速度演算部が求めたモータ回転速度とに基づいて、前記PWMインバータ主回路の出力電圧の振幅および位相をそれぞれ決定する電圧決定部と、A voltage determination unit that determines the amplitude and phase of the output voltage of the PWM inverter main circuit based on the first and second voltage adjustment components and the motor rotation speed obtained by the motor speed calculation unit;
前記電圧決定部により決定された振幅および位相を有する出力電圧を前記永久磁石式同期モータへ供給するように前記PWMインバータ主回路を制御するインバータ制御部と、An inverter control unit for controlling the PWM inverter main circuit so as to supply an output voltage having an amplitude and a phase determined by the voltage determination unit to the permanent magnet synchronous motor;
前記モータ電流指令値を入力する手段として、前記モータ速度演算部が求めたモータ回転速度に対し発生したいモータトルクを得るモータ電流を指令するモータ電流指令値を生成するモータ電流指令生成部と、を備え、As a means for inputting the motor current command value, a motor current command generation unit for generating a motor current command value for commanding a motor current for obtaining a motor torque to be generated with respect to the motor rotation speed obtained by the motor speed calculation unit, Prepared,
前記PWMインバータ駆動永久磁石式同期モータの前記モータ電流指令生成部が、モータ回転速度に対するモータ電流指令値を1次関数として変化するように生成し、The motor current command generation unit of the PWM inverter driven permanent magnet type synchronous motor generates a motor current command value for the motor rotation speed so as to change as a linear function,
圧力損失の低い領域と高い領域とで係数が異なる2つ以上の1次関数の関係となるように制御するControl to have a relationship of two or more linear functions with different coefficients in the low pressure loss region and high pressure region
ことを特徴とする換気送風機の制御方法。A method for controlling a ventilation fan. - 遠心式羽根車を備え、PWMインバータ駆動永久磁石式同期モータが搭載された換気送風機の制御方法であって、A control method for a ventilation fan equipped with a centrifugal impeller and equipped with a PWM inverter driven permanent magnet synchronous motor,
前記PWMインバータ駆動永久磁石式同期モータは、The PWM inverter driven permanent magnet synchronous motor is
永久磁石式同期モータと、A permanent magnet synchronous motor;
交流電源を直流電源へ変換する整流平滑回路と、前記直流電源の出力電圧をスイッチングすることにより前記永久磁石式同期モータに可変電圧・可変周波数の交流電力を供給するPWMインバータ主回路と、A rectifying / smoothing circuit for converting an AC power source to a DC power source, a PWM inverter main circuit for supplying AC power of variable voltage / variable frequency to the permanent magnet type synchronous motor by switching the output voltage of the DC power source,
前記PWMインバータ主回路を制御するモータトルク制御部と、を備え、A motor torque control unit for controlling the PWM inverter main circuit,
前記モータトルク制御部は、The motor torque control unit
前記永久磁石式同期モータの回転子の磁極位置を検出する位置センサからの位置センサ信号に基づき前記永久磁石式同期モータの回転速度を演算するモータ速度演算部と、A motor speed calculation unit for calculating a rotation speed of the permanent magnet type synchronous motor based on a position sensor signal from a position sensor for detecting a magnetic pole position of a rotor of the permanent magnet type synchronous motor;
前記PWMインバータ主回路の直流母線に流出入する電流を検出し平均電流を求める直流母線平均電流検出回路と、A DC bus average current detection circuit for detecting the current flowing into and out of the DC bus of the PWM inverter main circuit and obtaining an average current;
前記永久磁石式同期モータの巻線に流す電流の目標値であるモータ電流指令値に前記PWMインバータ主回路の変調率および前記永久磁石式同期モータの力率に相当する値を乗算し、係数倍して求めた平均電流指令値を出力する平均電流指令演算部と、Multiply the motor current command value, which is the target value of the current flowing through the winding of the permanent magnet synchronous motor, by the value corresponding to the modulation factor of the PWM inverter main circuit and the power factor of the permanent magnet synchronous motor, and multiply the coefficient An average current command calculation unit that outputs the average current command value obtained by
前記平均電流指令値と前記直流母線平均電流検出回路が検出した平均電流との電流偏差を算出する電流偏差算出部および前記電流偏差がなくなるように指令する第1の電圧調整成分を演算出力する電流制御アンプを有するモータ電流制御部と、A current deviation calculation unit that calculates a current deviation between the average current command value and the average current detected by the DC bus average current detection circuit, and a current that calculates and outputs a first voltage adjustment component that commands the current deviation to disappear. A motor current control unit having a control amplifier;
前記PWMインバータ主回路のスイッチング回路を流れる相電流の位相と前記位置センサ信号から得られる該当相誘起電圧の位相との位相差を検出する電流位相検出部と、A current phase detector for detecting a phase difference between a phase of a phase current flowing through the switching circuit of the PWM inverter main circuit and a phase of a corresponding phase induced voltage obtained from the position sensor signal;
前記位相差が位相差目標値に近づくように指令する第2の電圧調整成分を演算出力する位相制御部と、A phase controller that calculates and outputs a second voltage adjustment component that commands the phase difference to approach the phase difference target value;
前記第1および第2の電圧調整成分と前記モータ速度演算部が求めたモータ回転速度とに基づいて、前記PWMインバータ主回路の出力電圧の振幅および位相をそれぞれ決定する電圧決定部と、A voltage determination unit that determines the amplitude and phase of the output voltage of the PWM inverter main circuit based on the first and second voltage adjustment components and the motor rotation speed obtained by the motor speed calculation unit;
前記電圧決定部により決定された振幅および位相を有する出力電圧を前記永久磁石式同期モータへ供給するように前記PWMインバータ主回路を制御するインバータ制御部と、An inverter control unit for controlling the PWM inverter main circuit so as to supply an output voltage having an amplitude and a phase determined by the voltage determination unit to the permanent magnet synchronous motor;
前記モータ電流指令値を入力する手段として、前記モータ速度演算部が求めたモータ回転速度に対し発生したいモータトルクを得るモータ電流を指令するモータ電流指令値を生成するモータ電流指令生成部と、を備え、As a means for inputting the motor current command value, a motor current command generation unit for generating a motor current command value for commanding a motor current for obtaining a motor torque to be generated with respect to the motor rotation speed obtained by the motor speed calculation unit, Prepared,
前記PWMインバータ駆動永久磁石式同期モータの前記モータ電流指令生成部が、モータ回転速度に対するモータ電流指令値を1次関数として変化するように生成し、The motor current command generation unit of the PWM inverter driven permanent magnet type synchronous motor generates a motor current command value for the motor rotation speed so as to change as a linear function,
圧力損失の低い領域と高い領域とで係数が異なる2つ以上の1次関数の関係となるように制御するControl to have a relationship of two or more linear functions with different coefficients in the low pressure loss region and high pressure region
ことを特徴とする換気送風機の制御方法。A method for controlling a ventilation fan. - 遠心式羽根車を備え、PWMインバータ駆動永久磁石式同期モータが搭載された換気送風機の制御方法であって、A control method for a ventilation fan equipped with a centrifugal impeller and equipped with a PWM inverter driven permanent magnet synchronous motor,
前記PWMインバータ駆動永久磁石式同期モータは、The PWM inverter driven permanent magnet synchronous motor is
永久磁石式同期モータと、A permanent magnet synchronous motor;
交流電源を直流電源へ変換する整流平滑回路と、前記直流電源の出力電圧をスイッチングすることにより前記永久磁石式同期モータに可変電圧・可変周波数の交流電力を供給するPWMインバータ主回路と、A rectifying / smoothing circuit for converting an AC power source to a DC power source, a PWM inverter main circuit for supplying AC power of variable voltage / variable frequency to the permanent magnet type synchronous motor by switching the output voltage of the DC power source,
前記PWMインバータ主回路を制御するモータトルク制御部と、を備え、A motor torque control unit for controlling the PWM inverter main circuit,
前記モータトルク制御部は、The motor torque control unit
前記永久磁石式同期モータの回転子の磁極位置を検出する位置センサからの位置センサ信号に基づき前記永久磁石式同期モータの回転速度を演算するモータ速度演算部と、A motor speed calculation unit for calculating a rotation speed of the permanent magnet type synchronous motor based on a position sensor signal from a position sensor for detecting a magnetic pole position of a rotor of the permanent magnet type synchronous motor;
前記PWMインバータ主回路の直流母線に流出入する電流を検出し平均電流を求める直流母線平均電流検出回路と、A DC bus average current detection circuit for detecting the current flowing into and out of the DC bus of the PWM inverter main circuit and obtaining an average current;
前記平均電流を前記PWMインバータ主回路の変調率および前記永久磁石式同期モータの力率に相当する値で除算し、係数倍して求めたモータ電流フィードバック値を出力するモータ電流演算部と、Dividing the average current by a value corresponding to the modulation factor of the PWM inverter main circuit and the power factor of the permanent magnet synchronous motor, and outputting a motor current feedback value obtained by multiplying by a coefficient;
前記永久磁石式同期モータの巻線に流す電流の目標値であるモータ電流指令値と前記モータ電流フィードバック値との電流偏差を算出する電流偏差算出部および前記電流偏差がなくなるように指令する第1の電圧調整成分を演算出力する電流制御アンプを有するモータ電流制御部と、A current deviation calculation unit that calculates a current deviation between a motor current command value that is a target value of a current that flows through the winding of the permanent magnet synchronous motor and the motor current feedback value, and a first command that eliminates the current deviation. A motor current control unit having a current control amplifier that calculates and outputs the voltage adjustment component of
前記PWMインバータ主回路のスイッチング回路を流れる相電流の位相と前記位置センサ信号から得られる該当相誘起電圧の位相との位相差を検出する電流位相検出部と、A current phase detector for detecting a phase difference between a phase of a phase current flowing through the switching circuit of the PWM inverter main circuit and a phase of a corresponding phase induced voltage obtained from the position sensor signal;
前記位相差が位相差目標値に近づくように指令する第2の電圧調整成分を演算出力する位相制御部と、A phase controller that calculates and outputs a second voltage adjustment component that commands the phase difference to approach the phase difference target value;
前記第1および第2の電圧調整成分と前記モータ速度演算部が求めたモータ回転速度とに基づいて、前記PWMインバータ主回路の出力電圧の振幅および位相をそれぞれ決定する電圧決定部と、A voltage determination unit that determines the amplitude and phase of the output voltage of the PWM inverter main circuit based on the first and second voltage adjustment components and the motor rotation speed obtained by the motor speed calculation unit;
前記電圧決定部により決定された振幅および位相を有する出力電圧を前記永久磁石式同期モータへ供給するように前記PWMインバータ主回路を制御するインバータ制御部と、An inverter control unit for controlling the PWM inverter main circuit so as to supply an output voltage having an amplitude and a phase determined by the voltage determination unit to the permanent magnet synchronous motor;
前記モータ電流指令値を入力する手段として、前記モータ速度演算部が求めたモータ回転速度に対し発生したいモータトルクを得るモータ電流を指令するモータ電流指令値を生成するモータ電流指令生成部と、を備え、As a means for inputting the motor current command value, a motor current command generation unit for generating a motor current command value for commanding a motor current for obtaining a motor torque to be generated with respect to the motor rotation speed obtained by the motor speed calculation unit, Prepared,
前記PWMインバータ駆動永久磁石式同期モータの前記モータ電流指令生成部が、モータ回転速度に対するモータ電流指令値を1次関数として変化するように生成し、The motor current command generation unit of the PWM inverter driven permanent magnet type synchronous motor generates a motor current command value for the motor rotation speed so as to change as a linear function,
前記モータ電流指令値またはモータ電流演算部の出力に対して前記モータ回転速度が所定値を超えたらアラームを出力するWhen the motor rotation speed exceeds a predetermined value with respect to the motor current command value or the output of the motor current calculation unit, an alarm is output.
ことを特徴とする換気送風機の制御方法。A method for controlling a ventilation fan. - 遠心式羽根車を備え、PWMインバータ駆動永久磁石式同期モータが搭載された換気送風機の制御方法であって、A control method for a ventilation fan equipped with a centrifugal impeller and equipped with a PWM inverter driven permanent magnet synchronous motor,
前記PWMインバータ駆動永久磁石式同期モータは、The PWM inverter driven permanent magnet synchronous motor is
永久磁石式同期モータと、A permanent magnet synchronous motor;
交流電源を直流電源へ変換する整流平滑回路と、前記直流電源の出力電圧をスイッチングすることにより前記永久磁石式同期モータに可変電圧・可変周波数の交流電力を供給するPWMインバータ主回路と、A rectifying / smoothing circuit for converting an AC power source to a DC power source, a PWM inverter main circuit for supplying AC power of variable voltage / variable frequency to the permanent magnet type synchronous motor by switching the output voltage of the DC power source,
前記PWMインバータ主回路を制御するモータトルク制御部と、を備え、A motor torque control unit for controlling the PWM inverter main circuit,
前記モータトルク制御部は、The motor torque control unit
前記永久磁石式同期モータの回転子の磁極位置を検出する位置センサからの位置センサ信号に基づき前記永久磁石式同期モータの回転速度を演算するモータ速度演算部と、A motor speed calculation unit for calculating a rotation speed of the permanent magnet type synchronous motor based on a position sensor signal from a position sensor for detecting a magnetic pole position of a rotor of the permanent magnet type synchronous motor;
前記PWMインバータ主回路の直流母線に流出入する電流を検出し平均電流を求める直流母線平均電流検出回路と、A DC bus average current detection circuit for detecting the current flowing into and out of the DC bus of the PWM inverter main circuit and obtaining an average current;
前記永久磁石式同期モータの巻線に流す電流の目標値であるモータ電流指令値に前記PWMインバータ主回路の変調率および前記永久磁石式同期モータの力率に相当する値を乗算し、係数倍して求めた平均電流指令値を出力する平均電流指令演算部と、Multiply the motor current command value, which is the target value of the current flowing through the winding of the permanent magnet synchronous motor, by the value corresponding to the modulation factor of the PWM inverter main circuit and the power factor of the permanent magnet synchronous motor, and multiply the coefficient An average current command calculation unit that outputs the average current command value obtained by
前記平均電流指令値と前記直流母線平均電流検出回路が検出した平均電流との電流偏差を算出する電流偏差算出部および前記電流偏差がなくなるように指令する第1の電圧調整成分を演算出力する電流制御アンプを有するモータ電流制御部と、A current deviation calculation unit that calculates a current deviation between the average current command value and the average current detected by the DC bus average current detection circuit, and a current that calculates and outputs a first voltage adjustment component that commands the current deviation to disappear. A motor current control unit having a control amplifier;
前記PWMインバータ主回路のスイッチング回路を流れる相電流の位相と前記位置センサ信号から得られる該当相誘起電圧の位相との位相差を検出する電流位相検出部と、A current phase detector for detecting a phase difference between a phase of a phase current flowing through the switching circuit of the PWM inverter main circuit and a phase of a corresponding phase induced voltage obtained from the position sensor signal;
前記位相差が位相差目標値に近づくように指令する第2の電圧調整成分を演算出力する位相制御部と、A phase controller that calculates and outputs a second voltage adjustment component that commands the phase difference to approach the phase difference target value;
前記第1および第2の電圧調整成分と前記モータ速度演算部が求めたモータ回転速度とに基づいて、前記PWMインバータ主回路の出力電圧の振幅および位相をそれぞれ決定する電圧決定部と、A voltage determination unit that determines the amplitude and phase of the output voltage of the PWM inverter main circuit based on the first and second voltage adjustment components and the motor rotation speed obtained by the motor speed calculation unit;
前記電圧決定部により決定された振幅および位相を有する出力電圧を前記永久磁石式同期モータへ供給するように前記PWMインバータ主回路を制御するインバータ制御部と、An inverter control unit for controlling the PWM inverter main circuit so as to supply an output voltage having an amplitude and a phase determined by the voltage determination unit to the permanent magnet synchronous motor;
前記モータ電流指令値を入力する手段として、前記モータ速度演算部が求めたモータ回転速度に対し発生したいモータトルクを得るモータ電流を指令するモータ電流指令値を生成するモータ電流指令生成部と、を備え、As a means for inputting the motor current command value, a motor current command generation unit for generating a motor current command value for commanding a motor current for obtaining a motor torque to be generated with respect to the motor rotation speed obtained by the motor speed calculation unit, Prepared,
前記PWMインバータ駆動永久磁石式同期モータの前記モータ電流指令生成部が、モータ回転速度に対するモータ電流指令値を1次関数として変化するように生成し、The motor current command generation unit of the PWM inverter driven permanent magnet type synchronous motor generates a motor current command value for the motor rotation speed so as to change as a linear function,
前記モータ電流指令値またはモータ電流演算部の出力に対して前記モータ回転速度が所定値を超えたらアラームを出力するWhen the motor rotation speed exceeds a predetermined value with respect to the motor current command value or the output of the motor current calculation unit, an alarm is output.
ことを特徴とする換気送風機の制御方法。A method for controlling a ventilation fan.
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