JPH01268487A - Inverter control device - Google Patents

Abstract

PURPOSE:To reduce storage data amount and to effectively utilize a 1-chip CPU by obtaining a revolving magnetic field only from sequential data, one output vector pattern data and timer data. CONSTITUTION:A microcomputer 6 outputs a control signal for controlling an inverter 2 according to data stored in a RAM 5, and an inverter driver 7 drives the inverter 2 on the basis of the control signal. Sequential data for designating the output sequence of a plurality of sets of basic magnetic field vectors for generating a revolving magnetic field and output vector pattern data are stored in the RAM 5. One set of basic magnetic field vector is selected on the basis of the sequential data of the memory, output at an output time determined by the timer data according to the sequence of the output vector pattern data, thereby generating the revolving magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an inverter control device that controls an inverter based on an energization pattern stored in a storage unit.

<Prior Art> Conventionally, as this type of inverter control device, there is one shown in FIG. This interface control device has a ROM (ROM) that stores the energization pattern for obtaining three-phase AC power.
(read-only memory) 11. and,
The negative part of the three-phase AC voltage waveform as shown in Fig. 9(a) is inverted as shown in Fig. 9(b), separated by an electrical angle of 30 degrees and superimposed, and the result is shown in Fig. 9(c). 6 waveform patterns D
. ,D,,...,D.

get. Then, the data of these six voltage waveform patterns (74 voltage waveform data) are stored in the above ROM for each frequency in 64 words per voltage waveform pattern! ■Memorize it.

The six voltage waveform data for each frequency stored in the ROMII are sent to the data selector 13.
14 and 15 are read out sequentially for each phase. This read voltage waveform data is inverted/non-inverted in accordance with the signal from the three-phase decoder I6 to obtain a three-phase sine waveform as shown in FIG. 9(a). The control signal consisting of this three-phase sinusoidal waveform is input to the base of the transistor of the three-phase inverter circuit.

<Problems to be Solved by the Invention> As described above, the conventional inverter control device described above decomposes a three-phase AC voltage waveform into six voltage waveform patterns at an electrical angle of 30 degrees, and generates the six voltage waveform patterns D. ,Dl
,..., Since the data representing D s is stored in the ROMII in 64 words per voltage waveform pattern for each frequency, the three-phase AC voltage waveform pattern data at 360 electrical degrees is stored in the same 128 words. capacity ROM
The electrical resolution can be improved compared to the case where the data is stored in 11. However, there is still a lot of data to memorize,
There is a problem in that the l-chip CPU (central processing unit) cannot be used effectively.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inverter control device that can output control signals for inverter control with a small amount of stored data.

<Means for Solving the Problems> In order to achieve the above object, the inverter drive device of the present invention, as illustrated in FIG. a storage unit that stores output vector pattern data representing a combination pattern of data of the basic magnetic field vector to obtain a unit rotation of the magnetic field, and timer data determining an output time of the basic magnetic field vector; 5, reading the output vector pattern data stored in the storage unit in the forward/reverse direction and non-inverted/inverted;
A set of basic magnetic field vectors is sequentially selected from among the plurality of sets of basic magnetic field vectors stored in the storage unit based on the above order data, and this selected set of basic magnetic field vectors is read out from the storage unit. Based on the rotating magnetic field control unit 6 which outputs at the output time determined by the timer data according to the order of the output vector pattern data, and the rotating magnetic field output from the rotating magnetic field control unit,
The present invention is characterized in that it includes an inverter drive section 7 that outputs a control signal to the inverter.

<Operation> Based on the order data representing the output order of the plurality of sets of basic magnetic field vectors for generating the rotating magnetic field stored in the storage unit 5, the rotating magnetic field control unit 6 selects one of the plurality of sets of basic magnetic field vectors. A set of fundamental magnetic field vectors is sequentially selected. Also, the output vector to obtain the unit rotation of the magnetic field is
Pattern data and timer data determining the output time of the basic magnetic field vector are read from the storage section 5 by the rotating magnetic field control section 6.

Then, the selected set of basic magnetic field vectors is outputted in the forward or reverse direction and non-inverted or inverted according to the order of the output vector pattern data at the output time determined by the timer data. The rotating magnetic field control section 6 outputs the rotating magnetic field to generate a rotating magnetic field.

Then, the inverter drive unit 7 outputs a control signal to the inverter 2 based on the rotating magnetic field output from the rotating magnetic field control unit 6.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a block diagram of a motor rotation control device using an inverter control device of the present invention. This motor rotation control device rectifies a single-phase or three-phase AC power source 4 with a converter 3, converts the rectified output of this converter 3 into an AC voltage of variable frequency or variable voltage with an inverter 2, and then converts the converted AC voltage into an AC voltage of variable frequency or variable voltage. It is configured to apply a voltage to the electric motor 1. The microcomputer 6 outputs a control signal for controlling the inverter 2 according to data stored in a RAM (Random Access Memory) 5, and based on this control signal, the inverter driving section 7 controls the inverter 2. to drive. Above RAM5. The microcomputer 6 and the inverter drive section 7 constitute an inverter control device.

The RAM 5 stores order data and output vector pattern data that specify the output order of a plurality of sets of basic magnetic field vectors for generating a rotating magnetic field.

The above-mentioned basic magnetic field vectors include six types of basic magnetic field vectors Vl, Vt, V3, . V4°V8 and V8. The region of the rotating magnetic field is r as shown in Figure 3.
, n, m4v, v, and ■, each having a magnetic field angle of 60 degrees. Then, these six regions are defined as a pair (pair) of two basic magnetic field vectors among the six types of basic magnetic field vectors mentioned above.
vector). Then, as described above, the combination of the area and the pair vector and the order data representing the output order of the combination are stored in the RAM 5. In addition, the output vector pattern data includes the pair of vectors necessary to obtain a unit rotation of the magnetic field (corresponding to one of the six regions described above): one of the vectors (the first vector) and the other (the second vector). This is data representing the output pattern of the vector).

Next, the output vector pattern based on the above output vector pattern data will be explained.

First, when outputting the rotating magnetic field in the region ■, the second
Among the six types of basic vectors shown in the figure, a pair vector consisting of vector v4 and vector V8 specified by the above order data is used to output as follows. That is, the actual rotating magnetic field in region I is as shown in FIG. 4, and the pattern is reversed at a magnetic field angle of 30 degrees. Therefore, region I, (hereinafter,
Once you decide on the pattern for the table (30 degrees), use that as a basis for other areas 1. (hereinafter referred to as back 30 degrees) pattern is also determined.

Now, table 30 degrees (area IO output vector pattern
Data (1) is expressed as a series of 2-bit data corresponding to one output vector as shown below, and is stored in the output vector pattern table of the RAM 5 as described above.

“OIlo Olo Ilo O/1010110 O
/I Olo 0" ......(1) Here, the above output vector pattern data (1) is 2 as follows.
Each bit represents the output of one basic vector.

That is, "00" represents outputting a zero vector, "0bi" represents outputting the first vector of the pair vectors (vector ■4 in the case of region I), and "
10" indicates that the second vector of the pair vectors (vector Va in the case of area I) is output. Therefore, the actual output vector of the table 30 degrees is as shown in Figures 4 and 5.
As shown in the figure, V 4 , Vo , V 4 , Vo , V in the direction of the arrow
a, V4. Vo, Va, V.

becomes.

Next, the output vector pattern for back 30 degrees is shown in Table 3 above.
This is an inverted version of the 0 degree output vector pattern.

In other words, the back 30 degree output vector pattern data is the front 30 degree output vector pattern data (1
) can be read out as "o o/10100101/101 0010110 O10bi... (2)".

In addition, in the case of backward 30 degrees, the output contents of the 2-bit output vector pattern data "Ol" and "lO" are read interchangeably. Therefore, “00” represents outputting a zero vector, and “0bi” represents the second output of the above pair vector.
It represents outputting a vector (vector Va in the case of region I), and "10" represents outputting the first vector of the pair vectors (vector V4 in the case of region ■). Therefore, the actual output vector for back 30 degrees is the fourth
As shown in the figure and FIG. 5, V,,V,,V(1,V,,V,,V,,V,,VO,
It becomes Vll.

In this way, the output vector pattern of region I is obtained.・Next, when calculating the rotating magnetic field vector in region H, among the six types of basic vectors shown in FIG. 2, vector V of the pair vector specified by the order data,
and vector V, can be obtained as follows. Now, table 30 degree output vector pattern data (1)
In , “00” represents outputting a zero vector, and “0bi” represents outputting the first vector of the pair vectors (area H
In the case of , it means that the vector Va) is output, and “1
0'' indicates that the second vector of the pair vector (in the case of area ■, the vector vJ is output. Therefore, the output vector of the table 30 degrees of area ■ is Ve, Vo, Va, Vo, Vt, Vs, Vo+V *＋V
.

becomes.

Next, table 30 degree output vector pattern data (1
) is read backwards in the backward 30 degree output vector pattern data (2), "00" indicates that a zero vector is output, and "0bi" indicates that the second vector of the pair vector (area ■) is output. "10" means to output the vector vJ, and "10" means to output the first vector of the pair vector (vector ■6 in the case of region H). Therefore, the output vector 30 degrees behind region H are V o , V a , V o , V t , V
e, Vo, Vt, Vo, V
It becomes t.

In this way, the output vector pattern of region H is obtained.

Furthermore, for other areas III, IV, V, and ,
,v,,v3. The output vector pattern can be obtained by pair vectors consisting of v and V.

The output time of the output vector is controlled as shown in FIG. 6 based on timer data stored in the vector timer area of the RAM 5. That is, the frequency of the rotating magnetic field is controlled by controlling the output time of the output vector.

The operation of the inverter control device having the above configuration will be explained according to the flowchart shown in FIG. This flowchart shows the output of the rotating magnetic field in one of the six regions of the rotating magnetic field.

In step S1, according to the specified frequency, the RA
The timer stored in the vector timer area of M5
Data values are read.

Step S! If the region of the rotating magnetic field that you are trying to output now is 30 degrees backwards, the address pointer (output vector - pattern table pointer) to point to the end of the output vector pattern data string for reading in the reverse direction.

In step S3, the output vector, pattern, table,
A pointer is read.

In step S4, from the address of the output vector pattern table indicated by the output vector pattern table pointer, 2-bit data (one basic vector ) is loaded. At that time, Table 3
In the case of 0 degrees, the above output vector pattern data (1
) is read from the 0-be side, and if it is 30 degrees from the back, proceed to step S above.

By the operation in , data is read from the "00" side.

In step S, it is determined whether the 2-bit output vector pattern data read in step S4 is "00". If the result is other than "oo", the process proceeds to step S8; otherwise, the process proceeds to step S14.

In step S6, it is determined whether the region of the rotating magnetic field that is currently being output is 30 degrees. As a result, if the angle is 30 degrees, the process proceeds to step S7, and if not, the process proceeds to step S8.

In step S7, it is determined whether the 2-bit output vector pattern data read in step S4 is "0 bit." If the result is "0 bit," step S
, otherwise proceed to step S+t.

In step S, it is determined whether or not the 2-bit output vector pattern data read in step S4 is "0 bit".As a result, if it is "0 bit", step Sat
If not, proceed to step S.

In step S, data of the first vector among the bare vectors is selected.

At step SIO, the first vector of bare vectors is output.

In step Sll, it is determined whether a predetermined number of output vectors have been output. As a result, if the predetermined number of vectors have not been output, the process returns to step S3, and the incremented output vector pattern table pointer is read. Furthermore, if a predetermined number of magnetic field vectors have been output, output of the magnetic field vectors in this area is ended.

In step S11, data of the second vector among the bare vectors is selected.

Step S1. Then, the second vector of bare vectors is output, and the process proceeds to step S.

At step S+4, zero vector control is performed and the process proceeds to step S I+.

As described above, when the output of the rotating magnetic field in one region of the rotating magnetic field is completed, the operation of outputting the rotating magnetic field in the next region begins. That is, the bare vector in the next area is read out based on the above order data, and the rotating magnetic field in the next area is output again according to the flowchart of FIG. 7.

In this way, the RAM 5 of the inverter control device of the present invention
represents the order data indicating the output order of bare vectors consisting of six types of basic magnetic field vector data for generating a rotating magnetic field, and the combination pattern of the above basic magnetic field vectors to obtain a unit rotation of the magnetic field. One output vector pattern data is stored, and bare vectors corresponding to a predetermined area are sequentially selected from the plurality of sets of bare vectors based on the above order data, and the output vector pattern data is The output vector is output according to the flowchart shown in FIG.

Therefore, by simply storing one output vector pattern data, sequence data, and timer data in the RAM 5, the amount of information stored in the RAM 5 can be reduced and the efficiency of the l-chip CPU (central processing unit) can be reduced. It becomes possible to use it.

In the above embodiment, six types of basic vectors are used to represent the rotating magnetic field, and the rotating magnetic field is represented by output vector pattern data consisting of nine pieces of data in units of 2 bits. However, this invention is not limited to this,
By changing the number of basic vectors and the number of output vectors, a smoother rotating magnetic field vector can be obtained.

<Effects of the Invention> As is clear from the above, the inverter control device of the present invention combines order data representing the output order of a plurality of sets of basic magnetic field vectors and the basic magnetic field vectors to obtain a unit rotation of the magnetic field. Output vector pattern data representing the pattern and timer data determining the output time of the basic magnetic field vector are stored in a storage section, and a set of output vectors is stored in the storage section based on the order data in the storage section under the control of the rotating magnetic field control section. Basic magnetic field vectors are selected, and the selected set of basic magnetic field vectors are read out from the storage unit in the forward/reverse direction and non-inverted/inverted in the order of the output vector pattern data. Then, a rotating magnetic field is generated by outputting at the output time determined by the timer data, and the inverter drive section outputs a control signal to the inverter based on this rotating magnetic field. need only store the above order data, one output vector pattern data, and timer data.

Therefore, according to the present invention, it is possible to reduce the amount of data stored in the storage section and effectively utilize the 1-chip CPU.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an inverter control device of the present invention.
Fig. 2 is an explanatory diagram of fundamental vectors, Fig. 3 is an explanatory diagram of the region of the rotating magnetic field, Fig. 4 is a diagram showing the rotating magnetic field in the region ■ of Fig. 3, and Fig. 5 is an illustration of the rotating magnetic field in the region ■ of Fig. 3. An explanatory diagram of the output vector pattern, FIG. 6 is an explanatory diagram of basic vector output time control using timer data, FIG. 7 is a flowchart of rotating magnetic field output operation, and FIG. 8 is a block diagram of a conventional inverter control device. FIG. 9 is an explanatory diagram of the a-electrical pattern stored in the ROM in the conventional example. l...Electric motor, 2...Inverter, 3.
...Converter, 4...Three-phase AC power supply, 5...
・RAM1 6...Microcomputer, 7...
Inverter drive unit. Patent applicant: Daikin Industries, Ltd. Agent Patent attorney: Aoyama Aoyama and one other person Figure 5 Old name 1 Figure 6

Claims (1)

[Claims] (1) Output vector pattern representing the combination pattern of the order data representing the output order of multiple sets of basic magnetic field vectors to generate a rotating magnetic field and the data of the basic magnetic field vectors to obtain a unit rotation of the magnetic field. data and
a storage section (5) for storing timer data that determines the output time of the basic magnetic field vector; and a storage section (5) for storing timer data that determines the output time of the basic magnetic field vector; A set of basic magnetic field vectors is read out and sequentially selected from among the plurality of sets of basic magnetic field vectors stored in the storage unit based on the above order data, and this selected set of basic magnetic field vectors is read out from the storage unit. A rotating magnetic field control unit (6) that outputs output at an output time determined by the timer data according to the order of the read output vector pattern data.
An inverter control device comprising: an inverter drive unit (7) that outputs a control signal to the inverter based on the rotating magnetic field output from the rotating magnetic field control unit.