TW200941016A - Induction motor control device and motor constant measurement/computing method therefor - Google Patents

Abstract

A leakage inductance and the sum of a primary resistance and a secondary resistance can be measured with high precision only by the amplitude values of voltage and current without using the phase difference between voltage and current. An induction motor control device comprises a voltage command computing unit (14) for individually applying sinusoidal voltages of two preset different frequencies such that an alternating magnetic flux is generated while a motor is stopped, an impedance computing unit (16) for obtaining two impedance values by using voltage amplitude values and current amplitude values at the respective frequencies, and a constant computing unit (17) for obtaining a first leakage inductance value by using the difference between the two frequencies and the difference between the two impedance values, obtaining a second leakage inductance value by using the impedance value obtained by one frequency out of the two frequencies, and measuring/computing a leakage inductance value by using the first and second leakage inductance values.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction motor control device and a measurement calculation method for a motor constant using a control device that drives the same. [Prior Art] The conventional measurement of the induction motor constant 'measures the magnitude and phase difference of the voltage command and the output current' based on the impedance calculated from each size, and separates the impedance component and the inductance component using the phase difference. The sum of the primary impedance and the secondary impedance and the leakage inductance are obtained (for example, see 'Patent Document 1'). By using the technique of Patent Document 1 to calculate the magnitude of the voltage command v_ref and the voltage phase 0 v using the q-axis voltage command vq_ref and the d-axis voltage command vd_ref, the magnetic flux phase 0 fphi is added to the voltage phase 0 v and then the three-phase alternating current is calculated. The voltage phase of the coordinates. Further, the output current is detected, converted into iq_fb and id_fb, and the size of i_fb is calculated. Next, the voltage command 値, the average 电流 of the current detection 値, and the phase difference between the voltage command and the current detection 値 are calculated, and the motor constant of the induction motor is calculated. Further, the turn-on (〇N) voltage drop of the semiconductor conversion element that supplies the voltage to the driving device of the motor, the magnitude of the correction voltage, and the phase difference are used (for example, see Patent Document 2). In this way, the impedance is calculated from the magnitude of the voltage command and the output current, and the impedance component and the inductance component are separated by the phase difference to obtain the motor constant. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2002-228 No. 3 Patent No. 200941016 [Patent Document 2] Japanese Patent No. 3959617 [Draft of the Invention] [Problems to be Solved by the Invention] In the conventional motor constant measurement calculation method for an induction motor Since the phase difference between the voltage command and the output current is separated from the impedance component and the leakage inductance component, the phase difference detection calculation is necessary, and there is a problem that the arithmetic processing is increased. Further, since the detection error of the phase difference greatly affects the measurement accuracy of the impedance component, it is required to calculate the phase difference with high precision, and in order to perform more accurate calculations, there is another calculation process that becomes more complicated. Or there must be a problem with the 〇N voltage information of the power conversion component. The present invention has been made in view of such a problem, and an object thereof is to provide a high-precision measurement of leakage inductance and primary impedance with a phase difference between voltage and current without using a phase difference between voltage and current. An induction motor control device for the sum of secondary impedances and a motor constant measurement calculation method thereof. [Means for Solving the Problem] In order to solve the above problems, the present invention is constituted as follows. The invention according to claim 1 is characterized in that: a power converter capable of controlling a magnitude, a frequency, and a phase of an output voltage, and a current detector for detecting an output current flowing through each phase of the induction motor through the power converter And a motor constant calculator for calculating the electrical constant of the motor by using a voltage amplitude of the voltage outputted to the motor -6-200941016 値 and a current amplitude 演 calculated by the output current; the motor constant calculator, The voltage command calculation unit 'is sinusoidal voltage' and two impedance sines of two different frequencies that have been set in advance in a manner of generating an alternating magnetic flux in the stopped state of the motor, and an impedance calculation unit. In order to use the voltage amplitude 値 and the current amplitude 値 of the respective frequencies at this time, two impedances 求出 are obtained; and the difference between the two frequencies ^ and the difference between the two impedances 来 is used to obtain the first leakage current. The second leakage is obtained by using the impedance 求出 obtained by the frequency of any one of the two frequencies. Zhi, using the first and second leakage inductance is calculated to determine the play Zhizhi leakage inductance of the motor. Further, the invention according to claim 2 is the motor constant calculator described in claim 1, which is obtained by using the measured leakage inductance 値 of the motor and the frequency of any one of the two frequencies. The impedance 値 is used to calculate the sum of the primary impedance 値 and the secondary impedance 前述 of the motor. Further, the invention according to claim 3 is the motor constant calculator described in claim 2, wherein the two frequencies are fa and fb, and the two impedances Z are Za and Zb′ and the leakage inductance of the motor 値For L ', the sum of the primary impedance 値 and the secondary impedance 前述 of the aforementioned motor is as follows: R - ^Ζα2- (2· π · fa · L) 2 or R = 4^b2 - (2· π · fb L) 2 to find. In the invention of claim 4, the motor constant calculator described in claim 2 calculates the leakage inductance 値 of the motor that has been measured and the two impedances 来, and calculates the motor twice. The sum of the primary impedance 値 and the secondary impedance ,, and the sum of the two primary impedance 値 and the secondary impedance 近似 is approximated to the third frequency different from the two frequencies, and the motor is once calculated. The sum of the impedance 値 and the secondary impedance 値. Further, the invention according to claim 5 is the motor constant calculator according to claim 4, wherein the motor constant controller is configured such that the two frequencies are fa and fb, and the third frequency is (fa·fb). /(fa+fb) ο In order to solve the above problems, the present invention is as follows. According to the invention of claim 6, the motor constant measurement calculation method of the induction motor control device includes an induction motor that supplies a voltage through a power converter that can control the magnitude, frequency, and phase of the output voltage. In the state where the rotation is stopped, the sinusoidal voltages of the two different frequencies which are set in advance are individually given in such a manner that the electric motor generates the alternating magnetic flux, and the motor using the above-mentioned respective frequencies at the respective frequencies is used. The current amplitude 値 calculated by the output current flowing through each phase and the voltage amplitude 对 of the supply voltage to the motor are used to obtain two impedance ,, and the difference between the two frequencies and the two impedances 値 are used. The step of obtaining the first leakage inductance 値 and the step of obtaining the second leakage inductance 使用 using the impedance 求出 obtained by using the frequency of any one of the two frequencies, and using the first and second Leakage inductance 値' to measure -8- 200941016 The step of calculating the leakage inductance of the aforementioned motor. In addition, the invention described in the claim 7 is obtained by using the leakage inductance 値 of the motor that has been measured and the frequency of the two frequencies, in addition to the steps described in the sixth item of the claim. The impedance 値 is used to calculate the sum of the primary impedance 値 and the secondary impedance 前述 of the motor. Further, the invention described in claim 8 is in the step of calculating the sum of the primary impedance 値 and the secondary impedance 电动机 of the motor loaded in the calculation request item 7, so that the two frequencies are fa and fb, and the two The impedance 値 is Za, Zb' and the leakage inductance 値 of the aforementioned motor is L, and the sum of the primary impedance 値 and the secondary impedance 前述 of the aforementioned motor is expressed by the following formula: R = Vz « 2 π · fa · L) 2 or R = 4zh2-(2' π · fl? · L)2 is obtained. Further, the invention described in the claim 9 is a step of calculating the sum of the primary impedance 値 and the secondary impedance 电动机 of the motor described in the calculation request item 7 by the following steps: using the motor of the measured calculation The leakage inductance 値 and the two impedances 値 are calculated by the sum of the primary impedance 値 and the secondary impedance 2 of the motor twice, and the sum of the two primary impedance 値 and the secondary impedance , The straight line approximates the step of the third frequency which is different from the above two frequencies. Further, the invention described in the claim 1 is in the step of calculating the straight line described in the claim 9 to approximate the third frequency, and the first frequency is fa, fb, and The third frequency is (fa.fb)/(fa + fb). [Effects of the Invention] According to the invention described in the present invention, the leakage inductance and the sum of the primary impedance and the secondary impedance can be obtained only from the magnitude of the measured impedance, and the calculation process of the phase difference between the voltage and the current can be reduced, and The measurement precision can be improved by the influence of the detection error of the phase difference. [Embodiment] Hereinafter, specific embodiments of the method of the present invention will be described based on the drawings. [Embodiment 1] Fig. 1 is a view showing a configuration of a part of a motor control device which is applied to the method of the present invention. The motor constant calculator 1 is configured to generate a voltage command for measuring the motor constant, and to supply the command to the vector calculator 2, and to use the voltage command and the current detector 5 provided in the U phase and the current detector provided in the V phase. The detected output currents iu and iv are used to calculate the motor constant. This specific process will be described later. The vector calculator 2 is converted into voltage commands of the respective phases U, V, and W according to the magnitude of the voltage command v_ref and the voltage output phase 0V. The power converter 3 converts a DC power source (not shown) into a three-phase AC voltage according to a voltage command of each phase that has been input, and applies a sense of load to the load -10-200941016. Fig. 2' is a configuration diagram of the motor constant calculator 1 which is an important part of the present invention. Hereinafter, the operation of the motor constant calculator 1 will be described with reference to Fig. 2 . The coordinate conversion unit 11 converts the output currents iu and iv detected by the current detectors 5 and 6 into two-phase alternating current i a ' i β using equations (1) and (2).

Iw = —(ίύ + iv) ία _2 ^ — 1 1 1 2 2 iu iv 知·~ϊ 〇Α Λ L 2 2J iw .·,(1) (2) 尙, (2 in equation (2) 3) is a coefficient that equalizes the amplitude before and after the conversion; when the phase sequence is U, V, and W, it is set to forward rotation, and when the voltage output phase is 0v = rad (rad), the U phase is converted into the largest coordinate system. The α phase coincides with the U phase due to the three-phase two-phase transformation. First, the 〇 processing for determining the impedance from the measured voltage and current will be described. The current amplitude calculation unit 1 2 ' calculates the magnitude of the output current detection 値i_fb using Equation (3)'. I_fb = ^(ia2+i]32) **·(3) The current average 値 calculation unit 13 is the average 値 of the calculated output current detection 値i_fb, and the 値 is the current average 値i-det. This calculation 'obtains the absolute 値' of the output current detection 値i_fb using a low-pass filter for averaging and obtaining. Moreover, in the calculation of the current average 値i-det, the method of calculating the effective 値 in place of the average 也是 is also possible to implement the present invention in the case of 'in this case -11 - 200941016', after square the output current detection 値i_fb, The low pass filter is averaged to find its square root. The voltage command calculation unit 14' uses the equation (4) to calculate the amplitude v_ref of the voltage command, and simultaneously outputs 0v to the vector calculator 2 which is an arbitrary fixed value. V_ref=Vamp.sin(2. π .fh.t) ".(4) Moreover, Vamp is a variable 値, the initial applied is zero or a small 値, gradually increasing 'current detection 値The way to become a specific level is such that no excessive current flows at the beginning of the application. Fh is the frequency of the measurement conditions. Here, the amplitude v_ref of the voltage command is described as a voltage of one phase, but the configuration of the corresponding vector calculator 2 is treated as the line voltage. The voltage average 値 calculation unit 15 is an average 値v_det of the calculation voltage command v_ref. This calculation method is the same as that of the current average 値 calculation unit 13, and the description thereof is omitted here. In the case where the current detection 値i_det is obtained by the actual current 値 calculation unit 13, the voltage average 値 calculation unit 15 calculates the actual effect 以 by the same calculation method. The impedance calculation unit 16 calculates the impedance from the voltage average 値v_det and the current average 値 i_det. At this time, the data of the current 値 at two different points is substituted into the equation (5), and the impedance Z is obtained from the slope between the two points. Z = (Ve_a - Ve_b) / (Ie_a - Ie_b) (5) Further, Ve_a is the average value of the voltage command when the magnitude of the output current is energized with a specific 値1 (Ie_a); Ve_b is Output -12- 200941016 The current 的 is the average 电压 of the voltage command when the current is energized with a specific 値2 (Ie_b). In this way, the impedance Z is obtained by the slope between two points, and if the ON voltage of the power conversion element is lowered, the offset error can be removed to the voltage command element. Moreover, the processing time can be prioritized, and it can be obtained only by the data of the current 値 at one point. ❹ Further, the 频率 of the frequency fh in the equation (4) is such that, in order to ignore the mutual inductance 后, as will be described later, it is desirable to have a lower frequency in consideration of the influence of a higher frequency and a skin effect. The trade-off determines that it is also possible to use a range of more than one-tenth of the base (rated) frequency of the motor as the base (rated) frequency of the motor. Further, although the description here is based on the use of the voltage command 値, when the device for driving the induction motor is provided with a voltage detector, the voltage can be detected by the voltage. Next, before the description of the operation of the constant calculation unit 17, first, the motor constant of the induction motor measured in the present invention will be described. Fig. 3 is a T-1 type equivalent circuit of the induction motor used in the present embodiment to obtain the motor constant of the induction motor. In the figure, v_ref is the applied voltage, the primary current of the Π-based motor, the primary impedance of the R1-based motor, the secondary impedance of the R2-based motor, the leakage inductance of the L-system motor, and the mutual inductance of the Μ-type motor. Fig. 4 is a T-1 type equivalent circuit of the induction motor in the case where the frequency fh of the applied voltage is raised, and is an equivalent circuit of a phase of the motor for measuring the leakage inductance and the secondary impedance of -13 to 200941016. . Since the frequency fh of the applied voltage is increased, the mutual inductance Μ impedance (2·π .fh.M ) is larger than R2, and the current flowing to the Μ can be ignored. The impedance Ζ of the Τ-1 type equivalent circuit of the induction motor shown in Fig. 4 is expressed by the equation (6). Ζ + + + + + + + + + The inductance and the sum of the primary impedance and the second-order impedance are obtained. First, the impedance obtained by the impedance calculation unit 16 has the impedance Za of the frequency fa and the impedance Zb of the frequency fb, and these are substituted into the equation (7). (8) Find the leakage inductances LI and L2.

Ll=(Za-Zb)/{2. π .(fa-fb)} (7) L2=Zb/(2· π -fb) ---(8) ,, the impedance Z is approximately the same as the frequency In principle, the leakage inductances LI and L2 are the smaller and neglected effects of the sum of R1 and R2 for the leakage inductance L. Then, the leakage inductances L1 and L2 obtained by the equations (7) and (8) are substituted into the equation (9) to average both, and the leakage inductance L of the induction motor shown in FIGS. 3 and 4 is obtained. value. L=(Ll+L2)/2 (9) Next, using the equations (10) and (1 1 ) of the leakage inductance L obtained in the equation (9), the primary impedance R 1 of the frequency fa is obtained. And the secondary impedance R2 sum Ra, the frequency of the primary impedance R1 and the secondary impedance R2 -14- 200941016

Rb.

Ra = ^Za2 -(2· π · fa f L)2 * * *(10)

Rb = VZb2-(2^ π-fb* Lf . · <11) Next, the sum R of the primary impedance ri of the frequency f obtained by the equation (12) and the secondary impedance R2 is used, and the equation (13) is used. The interpolation approximation is performed as the sum R of the primary impedance R1 and the secondary impedance R2 of the induction motor shown in Figs.

f= (fa.fb)/(fa+fb) ...(12) R = Ra

Rb-'Ra fb-fa

(13) In addition, whether the interpolation of the primary impedance R1 and the secondary impedance R2 can be used to eliminate the frequency-dependent error factor of the primary impedance R1 and the secondary impedance R2 is explained by the equations (12) and (13). It is omitted here because it is disclosed in Japanese Laid-Open Patent Publication No. 2 003-339, No. Thus, the leakage inductance L of the induction motor shown in Figs. 3 and 4 and the sum R of the primary impedance R1 and the secondary impedance R2 can be obtained. [Embodiment 2] Fig. 5 is a flow chart showing the procedure for the actual measurement described above. The figure is used to illustrate the method of the present invention in order. First, at S100, 50% of the rated current of the motor is energized at a frequency of 30 Hz, and the voltage command 値V30_050 and the current detection 値130_050 are measured. Next, at S101, 5〇% of the motor rated current is energized at a frequency of 60 Hz, and the voltage command 値V60_05 0 and the current detection 値160_050 are measured. Next, in S102, the rated current of the motor is -15-200941016 100% at a frequency of 30 Hz, and the voltage command 値V30_100 and the current detection 値I30_100 are measured. Then, at S103, 100% of the rated current of the motor is energized at a frequency of 60 Hz, and the voltage command is measured.値V60_100 and current detection 値160_100 〇 Next, in S104, the data measured in S100 to S103 and the above equation (5) are used, and the impedances at fa (30 Hz) and fb (60 Hz) are respectively taken as Z30. Z60 to find. Z30= ( V30_100-V30_050 ) / ( 13 0_ 1 0 0 -13 0_0 5 0 ) Z60= ( V60_l 00-V60_050 ) / ( 16 0_ 1 0 0 -16 0_0 5 0 ) Next, at S105, use at S104 The calculated impedances Z30 and Z60 and the above equation (7) determine the leakage inductance L1. L1 = (Z60-Z30) / {2· π · (60-30) } Next, at S106, the leakage inductance L2 is obtained using the impedance Ζ60 calculated in S104 and the above equation (8). L2=Z60/ (2· η · 6 0) Next, in S107, the leakage inductance L of the induction motor is obtained using the LI, L2 and the above equation (9) calculated in S104 and S105, and is used as the leakage inductance. The measurement results. L - ( LI + L2 ) /2 Next, in S108, the impedance Z30 calculated in S104, the L calculated in S107, and the above equation (1〇) are used to obtain the primary impedance of the frequency fa (30 Hz). The sum Ra of R1 and the secondary impedance R2.

Ra =^30^-(2^-30^)2 200941016 Next, in S1〇9, the impedance f60 calculated in S104, the L calculated in S107, and the above equation (11)' are used to find the frequency fb. The sum of the primary impedance R1 and the secondary impedance R2 (60 Hz) Rb ° Sun = ^/2602 - 咎. ' 60'1) 2 Next, in S110, the calculated Rad in S108 is used, and the calculation is performed in S109. Rb and the above equations (12) and (13) 'determine the sum R of the primary impedance R1 and the secondary impedance R2 of the frequency f (20 Hz) as the sum of the primary impedance R1 and the secondary impedance R2 of the motor. The measurement result of R. f = ( 30. 60) /( 30+60) = 20 R= Ra~ ——(30—20) 60- 30 In this way, the leakage inductance L of the induction motor and the primary impedance R1 and the secondary impedance R2 can be calculated. And R ° Next, for the induction motor in which the respective elements are R1 = 〇 · 999 ( Ω ), 0.75 6 ( ❹ q ), L = 9.14 (mH), and the rated frequency is 60 Hz, the number of cases in which the above method is applied is shown. For example. The data at 2 points of fa=30Hz and fb=60Hz is explained as an example. 30Hz impedance Z30 is 2.464 (〇) '6 Hz impedance Z60 is 3.880 (Ω), and the leakage inductance L1' of the above formula (7) is L1 = (3.880-2.464) / {2· π · (60-30) } = 0.00751 (Η) = 7_51 (mH). The leakage inductance -17-200941016 obtained from the impedance Z60 of the above equation (8) at 60 Hz is taken as L2, L2 = 3.880 / (2 · π · 60) and 0.010.01 (Η) = 10.29 (mH ). In the case of L1, the fraction of the influence of R1 and R2 is small, and the fraction of the influence of R1 and R2 is increased by L2, and the leakage inductance L which substantially coincides with the true enthalpy is obtained by averaging the two.値(7.51+10.29) /2 =8.90 ( mH ). Substituting the L 値 into the sum of R1 and R2 obtained by the above equations (10) and (11) is as follows: 30 Hz is 1_8 05 ( Ω ) ^ 〇, and 60 Hz is 1.949 (Ω) ).

Ra = ^2Μ4ζ -(2* π *30^0.00890^ =1.805(Ω)

Rb = mf - (2^ π - 60^0.00890^ = 1 · 949 (Ω) Next, R = 1.757 (Ω) is obtained by interpolating approximately 20 Hz using the above equations (12) and (13)'. Also, the true sum of the primary impedance and the secondary impedance, the system 〇.998+0.756=1.754 (0)' is roughly the same as the above calculation 。. Thus, the phase difference between voltage and current is not used to measure the leakage only by the impedance. The inductance and the sum of the primary impedance and the secondary impedance can reduce the process of obtaining the phase difference without being affected by the detection error of the phase difference, and the leakage inductance and the sum of the primary impedance and the secondary impedance can be more accurately determined. In the case of the structure of the induction motor, for example, the higher the frequency is, the larger the impedance is, the higher the frequency is, and the frequency at which the interpolation is approximated is formed to be close to the frequency of the measurement condition, or The slope portion of the above formula (13) is multiplied by the coefficient corresponding to the configuration of the induction motor, etc., and the present invention can be applied. -18 - 200941016 [Industrial Applicability] It can be applied to driving an induction motor. All of the production A mechanical control device is used. [Fig. 1] A block diagram showing an induction motor control device according to a first embodiment of the present invention. [Fig. 2] A motor constant calculator 1 of an important part of the present invention Fig. 3 is a T-1 type equivalent circuit of an induction motor. [Fig. 4] The sum of primary impedance and secondary impedance and the equivalent circuit of the induction motor when measuring leakage inductance. [Fig. 5] shows the present invention. Flowchart of the measurement procedure of the second embodiment. [Description of main component symbols] 1: Motor constant calculator 2: Vector calculator 3: Power converter 4: Induction motor 5, 6: Current detector 11: coordinate conversion unit 1 2 : Current amplitude calculation unit -19- 200941016 1 3 : Current average 値 calculation unit 1 4 : Voltage command calculation unit 1 5 : Voltage average 値 calculation unit 1 6 : Impedance calculation unit 17 : Constant calculation unit -20-

Claims (1)

200941016 X. Patent application scope 1. An induction motor control device, comprising: a power converter capable of controlling a magnitude, a frequency, and a phase of an output voltage, and detecting a supply flow through the power converter to an induction motor a current detector for output current of each phase, and a voltage amplitude 値 of a voltage outputted to the motor and a current amplitude 値 calculated by the output current to determine an electrical Φ dynamic constant calculator for calculating an electrical constant of the motor The motor constant calculation unit includes a voltage command calculation unit that individually supplies two different frequency sine waves that have been set in advance so as to generate an alternating magnetic flux in a stopped state of the motor. The voltage and impedance calculation unit obtains two impedances 为 using the voltage amplitude 値 and the current amplitude 频率 at the respective frequencies at this time; using the difference between the two frequencies and the difference between the two impedances 値To find φ the first leakage inductance 値, use the frequency of any of the above two frequencies. The second leakage inductance 求出 is obtained by the impedance 値 obtained by the rate, and the leakage inductance 値 of the motor is measured by using the first and second leakage inductances 値. 2. The induction motor control device according to claim 1, wherein the motor constant calculator uses the leakage inductance 値 of the measured motor and the frequency of any one of the two frequencies. The obtained impedance 値 is used to calculate the sum of the primary impedance 値 and the secondary impedance 前述 of the motor. The induction motor control device according to the second aspect of the invention, wherein the motor constant controller is configured such that the two frequencies are fa and fb, and the two impedances are Za and Zb. And the leakage inductance 値 of the motor is L, the sum of the primary impedance 値 and the secondary impedance 前述 of the motor is as follows: and = λ / ζ〇 2 _ (2 · π · wu · L ) 2 or R = 4Zb7 , -(2·^ π · fb · L)? 4. The induction motor control device according to claim 2, wherein the motor constant calculator calculates the leakage inductance 値 of the motor that has been measured and the two impedance 値, and calculates the two times. The sum of the primary impedance 値 and the secondary impedance 电动机 of the motor is such that the sum of the two primary impedance 値 and the secondary impedance 近似 is approximated to the third frequency different from the two frequencies, and the motor is calculated. The sum of the impedance 値 and the secondary impedance 値. 5. The induction motor control device according to claim 4, wherein the motor constant controller is configured such that the two frequencies are fa and fb, and the third frequency is (fa.fb) / (fa +fb). 6. A motor constant measurement calculation method for an induction motor control device, which is characterized by the following: -22- 200941016 Supply voltage induction through a power converter capable of controlling the magnitude, frequency, and phase of an output voltage In a state where the motor is stopped, the sinusoidal voltages of the two different frequencies that are set in advance are individually given in such a manner that the electric motor generates an alternating magnetic flux, and the use of the respective frequencies at the time of use is used. The current amplitude 値 calculated by the output current flowing through each phase of the motor and the voltage amplitude 对 of the supply voltage of the motor 値 to obtain two impedance 値, and the difference between the two frequencies and the two impedances The step of obtaining the first leakage inductance 値 by the difference of 値, and the step of obtaining the second leakage inductance 使用 using the impedance 求出 obtained by using the frequency of any one of the two frequencies, and using the first and The second leakage inductance 値 is a step of measuring the leakage inductance 前述 of the motor. 7. A motor constant measurement calculation method for an induction motor control device, characterized in that: in addition to the steps described in the sixth item of the request, the leakage inductance 値 of the motor that has been measured and used, and the two frequencies are used. The impedance 値 obtained by the frequency of any one of them is used to calculate the sum of the primary impedance 値 and the secondary impedance 前述 of the motor. 8. The motor constant measurement calculation method of the induction motor control device according to claim 7, wherein: in the step of calculating the sum of the primary impedance 値 and the secondary impedance 电动机 of the motor, the two frequencies are Fa, for 'the above two impedances Z are Za, Zb, and the leakage inductance 値 of the aforementioned motor is L, then the sum of the primary impedance 値 and the secondary impedance -23 of the motor -23-200941016 is as follows: and =-JZa1 ~(2· π * fa · L)2 or R - ^Zb^-Xl· π * fb · L)2. 9. The motor constant measurement calculation method of the induction motor control device according to the seventh aspect of the invention, wherein: the step of summing the primary impedance 値 and the secondary impedance 演 of the calculation motor is performed by the following steps : using the leakage inductance 値 of the measured motor and the two impedances 値, calculating the sum of the primary impedance 値 and the secondary impedance 2 of the motor twice, and using the two primary impedances 値The sum of the secondary impedances , is used to calculate a step in which the straight line approximates the third frequency different from the above two frequencies. The motor constant measurement calculation method of the induction motor control device according to claim 9, wherein: Θ in the step of calculating a straight line that approximates the third frequency, the two frequencies are fa And fb, so that the third frequency is (fa·fb) / (fa + fb ). -twenty four-