JPH07298696A - Hybrid system of engine and induction motor - Google Patents

Abstract

PURPOSE:To provide a hybrid system of engine and induction motor which can be operated in various manners by a constitution wherein an access to a switching table is gained based on a primary linkage flux vector and an instantaneous torque outputted from an operating circuit and the target values of primary linkage flux command and torque command. CONSTITUTION:An operating circuit 6 operates the primary linkage flux vector and instantaneous torque of a three-phase induction motor 2 based on instantaneous current and voltage detected through a current/voltage sensor 4. A switching pattern selecting circuit 7 gains an access to a switching table 8 based on a primary linkage flux vector and an instantaneous torque operated by the operating unit 6 and target values of the three-phase induction motor 2, i.e. a primary linkage flux command and a torque command, delivered from a system computor 9 such that the error from the target value will be confined within a predetermined range. A switching voltage pattern to be set at the inverter section 3 is then selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine / induction motor hybrid device, and more particularly, to a hybrid device in which an engine and a three-phase induction motor are combined with each other, using a direct torque control type three-phase induction motor to drive the engine and the three-phase induction motor. The present invention relates to an engine / induction motor hybrid device that exchanges energy with a phase induction motor and controls its rotation.

[0002]

2. Description of the Related Art A hybrid device in which an engine and an induction motor are combined has been considered, such as starting an engine using a three-phase induction motor and using the engine as an induction generator driven by the engine.

[0003]

Conventionally, a starter as a DC motor has been used to start an engine.
However, as the analysis of the three-phase induction motor progresses, it is desired to start the engine using the three-phase induction motor. At that time, not only the starting of the engine but also the braking action,
It is desired to be used in various ways as an engine accelerator or alternator.

The present invention has been made in view of the above points, and uses a direct torque control type three-phase induction motor to transfer energy between the engine and the three-phase induction motor to control the rotation thereof. It is an object of the present invention to provide a hybrid device of an engine / induction motor that is designed to perform.

[0005]

In order to solve the above-mentioned problems, a hybrid device of an engine / induction motor according to the present invention is an engine / induction motor combined with an engine / induction motor.
In an induction motor hybrid device, an inverter unit that generates a rotating magnetic flux (primary interlinkage magnetic flux) in a three-phase winding of a three-phase induction motor by combining switching elements, and an instantaneous input voltage and current of the three-phase induction motor To a calculation circuit that calculates the primary interlinkage magnetic flux vector and the instantaneous torque, a predetermined maximum value φmax and minimum value φmin of the primary interlinkage magnetic flux, a predetermined magnetic flux declination region, and a normal rotation of the torque. , A switching table in which the switching voltage pattern of the inverter unit is stored in advance as data, with the types of stop and reverse rotation as elements, and the above-mentioned 1 output by the arithmetic circuit.
A switching pattern selection circuit that accesses the switching table based on the next interlinkage magnetic flux vector and the instantaneous torque and the target primary interlinkage magnetic flux command and the torque command, and selects the switching voltage pattern of the inverter unit. It is characterized by being.

[0006]

The operation circuit calculates the primary interlinkage magnetic flux vector and the instantaneous torque from the instantaneous input voltage and current of the three-phase induction motor, and determines the primary interlinkage magnetic flux vector and the instantaneous torque according to the coupling state with the engine. The switching voltage pattern of the inverter unit to be set and controlled is selected from the switching table stored in advance as data based on the target value of the primary interlinkage magnetic flux command and the torque command output.

Then, this switching voltage pattern is combined with the switching element in the inverter section. As a result, a rotating magnetic flux (primary interlinkage magnetic flux) is generated in the three-phase winding of the three-phase induction motor. Therefore, it is possible to use the direct torque control type three-phase induction motor in various ways as an engine start, a braking action, an engine acceleration or an alternator.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall view of an embodiment of an engine / induction motor hybrid apparatus according to the present invention.

In the figure, an engine 1 is directly connected to a three-phase induction motor 2, and energy is transferred between the engine 1 and the three-phase induction motor 2. The three-phase induction motor 2 is a torque direct control type induction motor controlled by a switching pattern of the switching elements Sa0 to Sc1 in the inverter unit 3.

The inverter unit 3 has its switching element S.
A three-phase AC voltage is supplied to the three-phase induction motor 2 according to the switching pattern of a0 to Sc1 to generate a rotating magnetic flux in the three-phase winding of the three-phase induction motor 2, but the instantaneous current flowing through the three-phase induction motor 2 at that time. The instantaneous voltage and the instantaneous voltage are detected by the current-voltage sensor 4, and the instantaneous current and the instantaneous voltage are input to the inverter control circuit 5.

The inverter control circuit 5 is an arithmetic circuit 6,
A switching pattern selection circuit 7 and a switching table 8 are provided. The arithmetic circuit 6 includes the current / voltage sensor 4
The primary interlinkage magnetic flux vector of the three-phase induction motor 2, that is, the magnitude of the primary interlinkage magnetic flux vector and the angle of the primary interlinkage magnetic flux vector (magnetic flux declination angle) based on the instantaneous current and the instantaneous voltage detected in , And the instantaneous torque are calculated and obtained.

The switching pattern selection circuit 7 has a magnitude of the primary interlinkage magnetic flux vector obtained by the arithmetic circuit 6, an angle of the primary interlinkage magnetic flux vector, an instantaneous torque, and three-phase induction given from the system computer 9. The switching table 8 is accessed from the primary interlinkage magnetic flux command and the torque command, which are the target values of the electric motor 2, so that the target value falls within a certain error range, and the switching that should be set in the inverter unit 3 is performed. It is designed to select a voltage pattern.

The switching table 8 has a predetermined maximum value φmax and minimum value φmin of the primary interlinkage magnetic flux.
Area of predetermined magnetic flux deviation angle, normal rotation of torque, stop,
The switching voltage pattern of the inverter unit 3 is stored in advance as data with the type of reverse rotation as an element.

In the system computer 9, information on the rotating magnetic field, that is, frequency, obtained from the inverter control circuit 5, particularly the arithmetic circuit 6, gear position information from the tachometer 10 attached to the three-phase induction motor 2, engine rotation information, Further, various information when the accelerator and the brake are stepped on, and various information when the starter switch and the retarder switch are turned on are input, and the system computer 9 is the primary chain corresponding to the state of the engine 2 at that time. The target values of the magnetic flux command and the torque command are output to the inverter control circuit 5.

Further, the system computer 9 is supplied with information on the battery voltage and current for monitoring the state of charge of the battery 11, so that the battery 11 of the system computer 9 is prevented from falling into a state such as over discharge or over charge. The protection is designed to be controlled.

Reference numeral 12 is a braking resistance control circuit. For example, when the brake is depressed, the braking resistance control circuit 12 generates a PWM signal for turning on / off the switching element 13 based on a signal from the system computer 9.
At this time, the three-phase induction motor 2 is operated as a generator, and its electromotive force is sent back to the power source side. That is, the three-phase induction motor 2 becomes a heavy load when viewed from the engine 2 side, and the electromotive force becomes regenerative braking (resistance braking) consumed by the resistor 14. Therefore, the braking action is supported.

In starting the engine 2, when the starter switch closing information is input to the system computer 9, the target values of the primary interlinkage magnetic flux command and the torque command for starting the engine are output from the system computer 9 to the inverter control circuit. 5, the inverter unit 3 supplies the three-phase AC voltage for generating the rotating magnetic flux to the three-phase induction motor 2 while changing the switching voltage pattern to be set in the inverter unit 3 every moment according to the starting state of the engine 2. .

When the engine 2 is started and brought into a constant speed rotation state, the three-phase induction motor 2 is operated as an induction generator, that is, an alternator, and its generated voltage serves as a power source for other electric components and also via the inverter section 3. The battery 11 is charged.

When the brake is stepped on, the brake information is input to the system computer 9, and the system computer 9 causes the inverter control circuit 5 to decelerate the engine 2 via the three-phase induction motor 2. The target values of the magnetic flux command and the torque command are output. Three-phase induction from the target interlinkage magnetic flux command and torque command, the magnitude of the primary interlinkage magnetic flux vector obtained by the arithmetic circuit 6 described above, the angle of the primary interlinkage magnetic flux vector, and the instantaneous torque. A switching voltage pattern that matches the torque command of the above target value is momentarily applied to the electric motor 2.
The three-phase induction motor 2 performs a braking action.

Conversely, when the accelerator is stepped on, the three-phase induction motor 2 is operated so that the torque increases. Therefore, in addition to the acceleration of the engine 1 side, the three-phase induction motor 2
The acceleration of the engine 1 is also supported from the side.

FIG. 2 shows the detailed construction of an embodiment of an engine / induction motor hybrid apparatus according to the present invention. In the figure, reference numerals 2, 3, 6 to 9 and 11 correspond to those of FIG. 1, 4-1 is a voltage sensor, 4-2 is a current sensor, 16-1 and 16-2 are three-phase / two-phase. Converter, 17-
1, 17-2 are multipliers, 18-1 and 18-2 are subtractors,
19-1 and 19-2 are integrators, 20 is an absolute value calculator, 2
Reference numerals 1-1 and 21-2 denote multipliers, 22 denotes a subtractor, 23 denotes a magnetic flux declination calculator, 24 denotes a magnetic flux comparator, and 25 denotes a torque comparator.

The switch Sa of the inverter unit 3 corresponds to the switching elements Sa0 and Sa1 of FIG. 1, and when the switch Sa is on with its contact 0, the switching element Sa0 of FIG. 1 is on and the switch Sa is on. When it is turned on with its contact 1, the switching element Sa1 in FIG. 1 corresponds to the turned-on state. Similarly to the switch Sa, the other switches Sb and Sc of the inverter unit 3 correspond to the respective states of the switching elements Sb0 to Sc1 of FIG.

The voltage sensor 4-1 is an instantaneous voltage between two phases,
For example, the interphase voltage Vvw between the V phase and the W phase and the interphase voltage Vwu between the W phase and the U phase are detected, and the current sensor 4-2 detects the two instantaneous currents, for example, the currents Iu and Iw. . Then, the three-phase / two-phase converters 16-1 and 16-2 provided correspondingly respectively perform three-phase / two-phase conversion calculation processing.

Here, the rotating magnetic flux vector Φ of the three-phase induction motor 2 due to the three-phase sinusoidal voltage is generally a circle, as shown in FIG. Vd and Vq are obtained in the three-phase / two-phase conversion arithmetic processing of the phase / two-phase converter 16-1, and id and iq are obtained in the three-phase two-phase conversion arithmetic processing of the three-phase / two-phase converter 16-2.

The ids and iqs thus obtained are respectively multiplied by the constant R1 of the primary resistance by the multipliers 17-1 and 17-2 provided correspondingly, and the subtractors 18-1 and 18-18.
Vd−R1 · id and Vq−R1 · iq are calculated respectively in −2. Then, the integrators 19-1 and 19-2 provided corresponding to them respectively integrate and obtain Φd, Φ
q is obtained.

Based on Φd and Φq thus obtained,
The absolute value calculator 20 calculates the absolute value of the primary flux linkage, that is, √ (Φd ² + Φq ² ). In addition, the corresponding multipliers 21-1, 21-2 are three-phase / two-phase converters 16-
The above id and iq obtained from 1, 16-2 are respectively multiplied to obtain Φd · iq and Φq · id, and then the subtractor 22 calculates the calculation torque T, that is, Φd · iq−Φq ·
Get the instantaneous torque of id.

Further, the magnetic flux declination calculator 23 uses the integrator 19
−1, 19−2 obtained from −1 and 19−2 and the absolute value of the primary interlinkage magnetic flux obtained from the absolute value calculator 20 √ (Φd
² + Φq ² ) and the magnetic flux declination is obtained.

In this way, the primary interlinkage magnetic flux vector and the instantaneous torque obtained in the arithmetic circuit 6 and the primary interlinkage magnetic flux command Φ * and the torque which are the target values of the three-phase induction motor 2 given from the system computer 9. From the command T *, a process of reading the data stored in the switching table 8 via the switching pattern selection circuit 7 is performed.

That is, the magnetic flux comparator 24 compares the target value of the primary interlinkage magnetic flux command Φ * with the absolute value √ (Φd ² + Φq ² ) of the primary interlinkage magnetic flux obtained from the absolute value calculator 20. Then, the magnetic flux deviation | Φ | is obtained, and the torque comparator 25 compares the target value of the torque command T * with Φd · iq−Φq · id of the calculated torque T obtained from the absolute value calculator 20. The torque deviation is obtained.

The switching table 8 is accessed on the basis of the magnetic flux deviation | Φ |, the torque deviation, and the magnetic flux deviation angle calculated by the magnetic flux deviation angle calculator 23 of the arithmetic circuit 6, and the switching that should be set and controlled in the inverter unit 3 is performed. Read the voltage pattern. The data stored in the switching table 8 will be described prior to the description of reading the switching voltage pattern.

FIG. 4 is an explanatory view of an embodiment of ROM address generation, FIG. 5 is a storage diagram of an embodiment of ROM address / data,
FIG. 6 is a storage diagram of an embodiment of ROM data, FIG. 7 is an explanatory diagram of generation of a rotating magnetic flux vector, FIG. 8 is an explanatory diagram of application of a switching voltage pattern, and FIG. 9 is an explanatory diagram of a relationship between a switching voltage vector and a switching voltage pattern. There is.

In the switching voltage pattern application diagram of FIG. 8, a voltage is applied from the battery 11 to the three-phase induction motor 2 in the form of a switching voltage pattern vi (Sa, Sb, Sc). Sa, Sb, Sc indicate the states of the switches. For example, when the contacts of the switches Sa, Sb, Sc are connected to the 0 side, 0 side, 1 side, respectively, the switching voltage pattern v ₁ (0, 0 , 1). At this time, the voltage corresponding to the switching voltage pattern v ₁ (0, 0, 1) is applied to the three-phase winding of the three-phase induction motor 2 from the battery 11, and the magnetic flux of the switching voltage vector V1 is generated. This corresponds to the switching voltage vector V1 in the direction shown in the center of FIG.

The other switching voltage vectors V2 to V6 shown in FIG. 9 have the same meaning, and the switching voltage patterns vi (Sa, Sb, Sc) have three switching states Sa, Sb, Sc. Accordingly, the magnetic fluxes of the switching voltage vectors V2 to V6 in the directions shown in the central portion of FIG. 7 are generated. When the switching voltage patterns are v ₀ (0,0,0) and v ₇ (1,1,1), the switching voltage vectors V0 and V7 are zero vectors and no magnetic flux is generated.

The magnetic flux deviation angles to which the switching voltage vectors V1 to V6 belong are divided into 6 regions in advance as shown in FIG. 7, and the region θ of the switching voltage vector V1 is 5 and the region θ of the switching voltage vector V2 is 3.
The region θ of the switching voltage vector V6 is defined as 2.

In the rotational flux vector generation explanatory diagram of FIG. 7, the maximum value φmax and the minimum value φmin of the primary interlinkage magnetic flux.
Is predetermined and set. Now, for example, the magnetic flux declination of the primary interlinkage magnetic flux Φ is in the position of the region θ = 6, and the switching voltage of the inverter unit 3 in the forward rotation, that is, in the clockwise direction and the magnetic flux of the switching voltage vector V6 is generated. When rotating under the pattern setting control, the magnitude of the primary interlinkage magnetic flux Φ is indicated by the magnitude of the vector that is combined with the vector of the primary interlinkage magnetic flux Φ and the switching voltage vector V6. Therefore, its tip rotates along the switching voltage vector V6.

Then, the primary interlinkage magnetic flux Φ has a region θ = 1.
At A, the maximum value of the primary interlinkage magnetic flux, which is set to a maximum value φmax, is about to be exceeded. At this time, by switching the switching voltage pattern of FIG. 8 to v ₂ (0,1,0), the magnetic flux of the switching voltage vector V2 is generated in the three-phase winding of the three-phase induction motor 2, and the primary interlinkage magnetic flux is generated. The tip of Φ rotates along the switching voltage vector V2.

The primary interlinkage magnetic flux Φ has a region θ = 1.
At B, the value of the primary interlinkage magnetic flux becomes less than or equal to the minimum value φmin. At this time, by switching the switching voltage pattern of FIG. 8 to v ₆ (1,1,0), the magnetic flux of the switching voltage vector V6 is generated in the three-phase winding of the three-phase induction motor 2, and the primary interlinkage magnetic flux is generated. The tip of Φ rotates along the switching voltage vector V6.

In this way, when the magnitude of the primary interlinkage magnetic flux is about to exceed the predetermined maximum value φmax of the primary interlinkage magnetic flux, and when the magnitude of the primary interlinkage magnetic flux is 1
When the minimum value of the next interlinkage magnetic flux becomes less than or equal to φmin,
The switching voltage pattern vi (Sa, S
b, Sc) is appropriately switched to determine the magnitude of the primary interlinkage magnetic flux to a predetermined maximum value φm of the primary interlinkage magnetic flux.
It can be set between ax and the minimum value φmin, and the magnitude of the primary interlinkage magnetic flux can generate a rotating magnetic flux vector forming a substantially constant circle.

When the calculation torque T of the calculation circuit 6 exceeds the target value of the torque command T *, the switching voltage vectors V0 and V7 at C, that is, the zero voltage vectors V0 and V7.
Is selected. That is, the switching voltage pattern v
_It is switched to ₀ (0, 0, 0) and v ₇ (1, 1, 1). By alternately using the voltage vector for rotating the primary interlinkage magnetic flux vector φ and the zero voltage vector for stopping it, the slip frequency can be instantaneously controlled.

As described above, the maximum value φmax and the minimum value φmin of the primary interlinkage magnetic flux whose magnitudes are predetermined are set.
Data for switching the switching voltage pattern so as to be stored between the above and the above are stored in advance in the switching table 8.

The switching table 8 is provided with the ROM address / data storage diagram shown in FIG. 5 according to the embodiment and the ROM data storage data storage diagram shown in FIG. 6 according to the embodiment shown in FIG. An embodiment of the stored ROM address / data shown in FIG. 4 is accessed by generating the addresses shown in the embodiment of the ROM address generation shown in FIG.

In the ROM address explanatory view of FIG. 4, R
The OM address is represented by two hexadecimal digits,
The upper digit is 2 bits of A5 and A4 out of 4 bits, and the torque T, that is, "00" at the time of forward rotation, "01" at the time of stop,
When reversing, give "11" and the lower digit is A of 4 bits.
Regions θ and A of the primary interlinkage magnetic flux with 3 bits of 3, A2 and A1
Predetermined maximum value φ of primary interlinkage magnetic flux with 1 bit of 0
A value greater than or equal to max and less than or equal to the minimum value φmin are given. That is, the region θ = with “011” of bits A3, A2, and A1.
1, the area θ = 2 at “010”, the area θ = at “000”
3, the area θ = 4 when “001”, the area θ = when “101”
5, when the region θ = 6 is given by “111” and 1 bit A0 is “0” and the primary flux linkage is about to be equal to or less than the predetermined minimum value φmin of the primary flux linkage, 1 bit Of A
The case where 0 is “1” and the primary interlinkage magnetic flux is about to exceed the predetermined maximum value φmax of the primary interlinkage magnetic flux is shown.

In the ROM address / data explanatory diagram of FIG. 5, the upper side of the diagonal line of each frame surrounded by the thick frame represents the hexadecimal two-digit address generated in FIG. Below the diagonal lines of the enclosed frames, data for extracting the ROM data stored in the ROM data of FIG. 6 described below, that is, two hexadecimal digits for accessing the ROM data of FIG. Represents the address of.

In the ROM data explanatory view of FIG. 6, the ROM data is an address based on the hexadecimal 2-digit data obtained from the ROM address / data as described in the ROM address / data explanatory view of FIG. The switching voltage pattern vi (Sa, Sb, Sc) is read. That is, among the 8 bits of D7 to D0, the upper 3 bits of D7, D6, D5 represent the switching voltage pattern vi (Sa, Sb, Sc), the bit of D7 is the contact state of the switch Sa, and the bit of D6 is The contact state of the switch Sb and the bit D5 represent the contact state of the switch Sc, respectively.

Now, for example, as described above, the primary interlinkage magnetic flux Φ
Is in the region θ = 6 as shown in the rotational flux vector generation explanatory diagram of FIG. 7, and the switching voltage vector V6
It is assumed that the switching voltage pattern of the inverter unit 3 is set so that the magnetic flux of is generated.

The magnitude of the primary interlinkage magnetic flux Φ, that is, the tip of the primary interlinkage magnetic flux Φ rotates along the switching voltage vector V6. Then, the tip of the primary interlinkage magnetic flux Φ tends to become larger than a predetermined maximum value φmax of the primary interlinkage magnetic flux. At this time, in the switching table 8, as described with reference to FIG. 4, the torque T is normally rotated and the region θ is 1, 1
From the state where the tip of the next interlinkage magnetic flux Φ is about to become larger than a predetermined maximum value φmax of the primary interlinkage magnetic flux,
A5, A4 bit is "00", A3, A2, A1 bit is "011", A0 bit is "1", that is, "0".
An address of "07" is generated by two hexadecimal digits of "00111".

The ROM address / data of FIG. 5 is accessed by the address "07", and the data "20" is read. The ROM data shown in FIG. 6 is accessed by using this data "20" as an address, and the data "001" is accessed.
"00000" is read. Top 2 to 4 of this data
The bits represent the switching voltage pattern v ₂ ,
The switching voltage pattern v ₂ is set and controlled by the inverter unit 3. As a result, the magnetic flux of the switching voltage vector V2 is generated in the three-phase winding of the three-phase induction motor 2 and
The magnitude of the next interlinkage magnetic flux Φ, that is, the tip of the primary interlinkage magnetic flux Φ rotates positively along the switching voltage vector V2.

Then, the tip of the primary interlinkage magnetic flux Φ tends to become smaller than a predetermined minimum value φmin of the primary interlinkage magnetic flux. At this time, in the switching table 8
As described above, the torque T is normally rotated, the region θ is 1, and the tip of the primary interlinkage magnetic flux is a predetermined minimum value φ of the primary interlinkage magnetic flux.
From the state where it is going to become smaller than min, A5
A4 bit is "00", A3, A2, A1 bit is "011", A0 bit is "0", that is, "0001".
An address of "06" is generated by the hexadecimal two digits of "10".

The ROM address / data of FIG. 5 is accessed by the address "06", and the data "60" is read out. Then, the ROM data of FIG. 6 is accessed using this data “60” as an address, and the data “011
"00000" is read. Top 2 to 4 of this data
The bits represent the switching voltage pattern v ₆ ,
The switching voltage pattern v ₆ is set and controlled by the inverter unit 3. As a result, the magnetic flux of the switching voltage vector V6 is generated in the three-phase winding of the three-phase induction motor 2, and 1
The magnitude of the next interlinkage magnetic flux Φ, that is, the tip of the primary interlinkage magnetic flux Φ rotates positively along the vector V6.

By performing the switching control of the switching voltage pattern of the inverter unit 3 in this manner, the magnitude of the primary interlinkage magnetic flux Φ has a predetermined maximum value φmax and minimum value φmin of the primary interlinkage magnetic flux. , A substantially circular rotating magnetic flux, that is, a primary interlinkage magnetic flux vector is generated in the three-phase winding of the three-phase induction motor 2, and the voltage vector to be rotated and the zero voltage vector to be stopped are alternately selected. Torque tracking control is performed by performing instantaneous slip frequency control.

[0051]

As described above, according to the present invention, the direct torque control type three-phase induction motor is used to transfer energy between the engine and the three-phase induction motor and control the rotation thereof. You can

[Brief description of drawings]

FIG. 1 is an overall view of an embodiment of an engine / induction motor hybrid device according to the present invention.

FIG. 2 is a detailed configuration of an embodiment of an engine / induction motor hybrid device of the present invention.

FIG. 3 is an explanatory diagram of a rotating magnetic flux vector.

FIG. 4 is an explanatory diagram of an embodiment of ROM address generation.

FIG. 5 is a storage diagram of an embodiment of ROM address / data.

FIG. 6 is a storage diagram of an embodiment of ROM data.

FIG. 7 is a diagram illustrating the generation of a rotating magnetic flux vector.

FIG. 8 is an explanatory diagram of application of a switching voltage pattern.

FIG. 9 is an explanatory diagram of a relationship between a switching voltage vector and a switching voltage pattern.

[Explanation of symbols]

 1 Engine 2 Three-Phase Induction Motor 3 Inverter Section 5 Inverter Control Circuit 6 Arithmetic Circuit 7 Switching Pattern Selection Circuit 8 Switching Table

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B60L 7/20 11/14 F02B 61/00 E F02N 11/04

Claims (3)

[Claims] 1. In an engine / induction motor hybrid device in which an engine and an induction motor are coupled, a rotating magnetic flux (primary interlinkage magnetic flux) is generated in a three-phase winding of a three-phase induction motor by a combination of switching elements. An inverter unit to be operated, an arithmetic circuit for calculating the primary interlinkage magnetic flux vector and the instantaneous torque from the instantaneous input voltage and current of the three-phase induction motor, and a predetermined maximum value φmax and minimum value of the primary interlinkage magnetic flux. φmin, a region of a predetermined magnetic flux deviation angle, a type of forward rotation, stop, and reverse rotation of the torque as elements, and a switching table in which the switching voltage pattern of the inverter unit is stored in advance as data, and the above-mentioned output from the arithmetic circuit. Based on the primary interlinkage magnetic flux vector and the instantaneous torque and the target value of the primary interlinkage magnetic flux command and the torque command, the switching table is updated. Sesushi hybrid device of the engine induction motor, characterized in that it comprises a switching pattern selection circuit for selecting the switching voltage pattern of the inverter unit. 2. The hybrid device of an engine and an induction motor according to claim 1, wherein the engine side becomes a load with respect to the induction motor, and the engine is started and accelerated by the induction motor. 3. The hybrid device of engine and induction motor according to claim 1, wherein the induction motor side is a load with respect to the engine, and the induction motor rotated by the engine is an induction generator.