JPH03143285A - Controller for variable reluctance motor - Google Patents

Abstract

PURPOSE:To stably and efficiently control the rotating speed zone of a wide range by validating control by current pattern control means in the low speed rotating zone of a rotor, and validating control by angle-of-lead control means in the high speed rotating zone of the rotor. CONSTITUTION:Control selecting means E selects control based on the actual rotating speed or target rotating speed of the rotor of a variable reluctance motor SR. Current pattern control means D controls in a low speed rotating one. Data of current pattern is read from the means D in response to a rotating position signal given from rotating position detecting means B. A current command value of an exciting current is applied to exciting means A based on the data. The means A is so operated that the conducting period of the exciting current becomes a leading phase to the exciting period of each exciting winding by angle-of-lead control means C in the high speed rotating zone. Thus, it can be stably and efficiently controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a control device for a variable reluctance motor that supplies excitation current to an excitation winding of the variable reluctance motor to control its rotational state.

(Prior Art) Generally, a variable reluctance motor is configured to apply an exciting current to an excitation winding to apply an attractive force to a protrusion of a rotor to generate torque.

In this case, in the rotational direction of the rotor, when the protrusion of the rotor approaches the excitation winding, the attraction force by the excitation winding acts as an accelerating torque, and conversely, when it moves away from the excitation winding, the attraction force acts as a braking torque. .

Therefore, in order to rotate the rotor, the period during which the acceleration torque acts is set as an excitation period, and the excitation winding is controlled to be energized during this excitation period.

However, in principle, acceleration torque can be generated by applying excitation current during the excitation period as described above;
In reality, when a constant excitation current is applied to the excitation winding, the torque generated in the rotor, both the acceleration torque and the braking torque, is not constant, but changes depending on the rotational position of the rotor. In other words, the positional relationship between the rotor and the excitation winding is -180 in electrical angle.
The range from ° to 0 ° is the original excitation period of acceleration torque, but in reality, acceleration torque is generated only in the middle region within that range, and almost no acceleration torque is generated in the regions at both ends, and the excitation period is Electric current only causes heat generation or noise. Furthermore, the magnitude of the acceleration torque in this intermediate region is only partially proportional to the magnitude of the excitation current (for example, the magnitude of the acceleration torque increases in the square proportional region as the excitation current increases). , the direct proportional region, and then the saturated region). Therefore, if a constant excitation current is applied to the excitation winding during the excitation period, the excitation current will be wasted and torque ripple will occur in the rotor, making it impossible to obtain a stable rotational state. Note that this applies not only to acceleration torque but also to braking torque.

An excitation current control device using current pattern control, which will be described below, was devised to solve these problems. Taking into consideration the torque characteristics specific to the variable reluctance motor described above, this motor stores in advance in a storage circuit, etc., the excitation current value that eliminates unnecessary parts when generating a constant torque as current command value data. This is read out according to the rotational position of the rotor, and the excitation winding is excited via an excitation circuit (for example, a circuit that applies the necessary excitation current to the excitation winding using a PWM control method based on the current command value). It is designed to apply electric current. As a result, the excitation current becomes optimal as shown in FIG. 8(a), and the rotor can be maintained in a rotating state with little torque ripple.

(Problem to be Solved by the Invention) However, with the current pattern control as described above, when the variable reluctance motor is controlled in a low speed region, a great effect can be obtained because the excitation current follows sufficiently. is controlled in the high speed region,
Due to the relatively large inductance of the excitation winding,
As the rotational speed of the rotor increases, the delay in the actual excitation current with respect to the current command value becomes noticeable (the excitation current lags with respect to the current command value as shown in Figure 7 (b)) ). Therefore, in this case, the exciting current is no longer applied at the optimal rotational position for the current command value, making it impossible to generate torque in the rotor with good responsiveness, as seen from the torque characteristics described above. There was a problem that disappeared.

By the way, as a control method to improve the responsiveness of such acceleration torque in the high-speed rotation region, the switching phase for applying the excitation current is set in advance during the reference excitation period (with respect to the excitation winding), taking into account the delay of the excitation current described above. There is a control method called advance angle control that covers the delay of the excitation current that actually flows by advancing the torque generation period due to the excitation current determined by the mechanical positional relationship of the rotor. However, in this control method, the current pattern control as described above is not performed (because torque ripple is not much of a problem in the high-speed rotation region of the rotor), so in the low-speed rotation region, the torque ripple does not occur as described above. The problem still remains.

In other words, due to these circumstances, conventionally there has been no control device that can stably and efficiently control the rotational state of a variable reluctance motor over a wide range of rotational speeds.

The present invention has been made in view of the above circumstances, and its purpose is to obtain a rotation state with less torque ripple when the rotor rotates at low speed, to improve torque response when rotating at high speed, and to achieve a rotation state over a wide range of rotations. An object of the present invention is to provide a control device for a variable reluctance motor that can be controlled stably and with high efficiency in a speed range.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the control device for a variable reluctance motor of the present invention is constructed by means as shown in the basic configuration diagram of FIG. 1. .

That is, excitation means A controls the current flowing through the excitation winding of the variable reluctance motor SR, rotational position detection means B detects the rotational position of the rotor of the variable reluctance motor SR, and detection is performed by the rotational position detection means B. advance angle control means C for operating the excitation means so that the excitation period of the excitation current is in an advanced phase with respect to the excitation period for each excitation winding determined according to the rotational position of the rotor; A current pattern storage means is provided in which data of the excitation current is stored in advance in correspondence with the rotational position of the rotor, and data is read from the current pattern storage means in accordance with the rotational position of the rotor detected by the rotational position detection means. current pattern control means for operating the excitation means A based on data obtained by the rotor; control selection means E for enabling control by the current pattern control means in a low speed rotation region of the rotor and enabling control by the advance angle control means C in a high speed rotation region of the rotor according to the determination result; It is characterized by the fact that it is configured with the following.

(Operation) According to the variable reluctance motor control device of the present invention,
The control selection means E selects a function based on at least one of the actual rotation speed and the preset target rotation speed of the rotor of the variable reluctance motor SR, that is, one or both of them, or a function determined from these values. The rotation state of the rotor is determined based on the value, etc., and according to the determination result, control by the current pattern control means is enabled in the low speed rotation region of the rotor, and control by the advance angle control means C in the high speed rotation region. Control is activated.

Therefore, in the low speed rotation region of the rotor, current pattern data is read out from the current pattern storage means D' by the current pattern control means in accordance with the rotational position signal given from the rotational position detection means B. Based on this, a current command value of the exciting current is given to the exciting means A. As a result, an optimum excitation current without waste is applied to the excitation winding of the variable reluctance motor SR according to the current pattern, and the rotor is maintained in a stable rotating state without causing torque ripple.

On the other hand, in the high-speed rotation region of the rotor, the lead angle control means C controls the excitation period of the excitation current for the excitation period of each excitation winding, which is determined according to the rotational position signal given from the rotational position detection means B. The excitation means A is operated so that the phase is advanced. As a result, the excitation winding of the variable reluctance motor SR is given a current whose phase is advanced by the amount of delay due to the influence of inductance, so that the actual excitation current is not delayed and torque is delivered to the rotor with good responsiveness. Given.

(Example) An example of the present invention will be described below with reference to FIGS. 2 to 7.

First, in FIG. 2 showing the overall configuration, ] is, for example, a four-phase variable reluctance motor, which is composed of a rotor (not shown), an excitation winding, etc., and the excitation current applied to the excitation winding as described later. The rotor rotates accordingly. A shaft encoder 2 is a rotational position detection means for detecting the rotational position of the rotor of the variable reluctance motor 1, and is configured to output a rotational position signal according to the rotational position. 3 is an excitation circuit which is an excitation means, and this is a comparator 4. Proportional integral circuit5. The PWM control circuit 6 is configured by connecting a drive circuit 7 and a current detector 8 in series, and applies an excitation current to the excitation winding of the variable reluctance motor 1. In this case, the current value detected by the current detector 8 is given to the comparator 4 as a feedback signal. 9 is a control circuit in which a program is stored in advance as described later, and CPU10. ROMII, RAM12. I10 circuit for setting input 13. It consists of a D/A conversion circuit 14 and an encoder input circuit 5, which are interconnected through an address and data bus 16. A target rotational speed value is input to the I100 circuit 13 from a setting device (not shown). The shaft encoder 2 is connected to the encoder input circuit 15, and a detection signal is supplied thereto. Further, the D/A conversion circuit 14 is connected to the comparator 4 of the excitation circuit 3 to provide an excitation current command value.

Next, the effects of this embodiment are shown in Figures 3(a) and (b).
This will be explained with reference to the flowchart.

In the control circuit 9, when the CPU 10 starts executing the main program for control, the CPU 10 executes the program as shown in FIG.
) Execute the selection program shown in the flowchart.

That is, the CPU ], 0 first reads the target rotational speed data input to the I10 circuit 13 (step P1), and then reads the data from the shaft encoder 2 to the input circuit 15.
(Step P2).

Note that the read data is stored in the RAM 12 and read out as necessary when executing the following operation 1. Next, CPU 1. O calculates the actual rotational speed of the rotor based on this rotational position signal (Step P3), calculates the deviation from the target rotational speed from this calculation result, and calculates a torque command value for generating the necessary torque (Step P3). Step P4). Next, the CPU 10 determines the change tendency of the inductance of the excitation winding (step P5), and further calculates the lead angle when performing lead angle control as will be described later (step p6). In this case, the magnitude of the calculated lead angle increases as the rotational speed increases. Note that the inductance value of the excitation winding is device-specific as a function of the rotation angle of the rotor. Therefore, the change tendency of the inductance of the excitation winding is determined in advance by RO based on the rotation angle of the rotor read in step P.
This is determined by reading the inductance value or its change tendency itself with respect to the rotation angle of the rotor stored in the MII.

Next, the CPU 10 compares the calculated advance angle magnitude 2 with a predetermined advance angle magnitude set in advance as a determination criterion, and selects a control means based on the determination result (step P7). That is, for a given advance angle,
When the calculated advance angle is large, it is determined that the actual rotational speed of the rotor is in the high speed rotation range, and a selection flag k is set (k-1)L to perform advance angle control; conversely, when it is small, It is determined that the actual rotation speed of the rotor is in the low speed rotation range, and the selection flag k is reset (k-0) to perform current pattern control. After this, CPU 1. O ends the selection program and returns to the main program.

Now, when the above selection program is finished, CPUl0
3(b) at a predetermined timing (for example, at intervals of several tens of microseconds to several hundred microseconds) due to the execution of the main program.
Execute the output program shown in (that is, after executing the above selection program once, this output program
0 times). In this output program, the CPU 10 first reads the rotational position signal 3 from the shaft encoder 2 (step S1), and then sets the selection flag flag 1 (k
=1) Determine whether or not (Step S2)
. Here, for example, if the selection flag k is not set, that is, if the rotor is in the low speed rotation region, rNOJ is determined in this determination step S2, and the process proceeds to step S3. CPU ], O is step S
, reads excitation current data corresponding to the rotational position of the rotor from the ROMII as a current pattern storage means, and then sets a magnification of the value of the current pattern in order to generate torque corresponding to the target rotational speed. Create a current command value corresponding to each of the four phases (step S4), output the current command value to the excitation circuit 3 via the D/A conversion circuit 1-4 (step S5), and end the output program. .

When the current command value is output from the control circuit 9, the excitation circuit 3
, the comparator 4 compares the current command value and the actual excitation current value given from the current detector 8 and outputs the deviation current value to the proportional-integral circuit 5 . The proportional-integral circuit 5 outputs PWM as a threshold signal whose level goes up and down according to the proportional part and cumulative part of the deviation current value.
Output to control circuit 6. The PWM control circuit 6 modulates the given threshold signal with a triangular wave of a predetermined frequency and outputs a pulse signal with a duty ratio corresponding to the excitation current to the drive circuit 7, and the drive circuit 7 responds to this pulse signal. An excitation current is applied to the excitation windings of each phase of the edible reluctance motor 1.

Thereafter, each time the above output program is executed, the control circuit 9 outputs the optimum current command value through current pattern control to the excitation circuit 3, and the excitation circuit 3 applies an excitation current according to this to the variable reluctance motor 1. to each phase excitation winding. As a result, the rotor of the variable reluctance motor 1 is controlled to a stable rotational state without causing torque ripple in the low speed rotation region.

On the other hand, when the rotational state of the rotor of the variable reluctance motor 1 is different from the above-mentioned state and is in the high-speed rotation region, the CPU 10 of the control circuit 9 sets the selection flag k (k-1) in the selection program 5 mentioned above. Therefore, in the output program judgment step S2, r
It is judged as YESj. In this case, the CPU 10 proceeds to step S6 and executes the following contents in order to execute advance angle control. That is, CPU 1. O is based on the lead angle value calculated in the selection program mentioned above,
An excitation period whose phase is advanced is set in consideration of a delay with respect to the basic excitation period determined from the mechanical positional relationship of the rotor.

Next, a current command value is created by combining the data of this excitation period and the torque command value (step S7), and then, in the same manner as described above, in step S5, the current command value is converted through the D/A conversion circuit 14. It outputs to the excitation circuit 3, ends the output program, and returns to the main program.

In the excitation circuit 3, an excitation current corresponding to the current command value is outputted to the excitation winding of each phase of the variable reluctance motor tacho in the same manner as described above. As a result, the excitation winding of the variable reluctance motor 1 is supplied with an excitation current whose phase is advanced, allowing the rotor to generate torque with good responsiveness in the high-speed rotation region.

Hereafter, each time the output program is executed (that is, every several hundred μsec to several m5 eC), the rotational state of the rotor of the variable reluctance motor 1 is determined, and based on the determination result, the current pattern is An excitation current is applied through control, and when the rotation is in a high-speed rotation region, an excitation current is applied through advance angle control. Therefore, the rotational state of the rotor is controlled without causing torque ripple in the low-speed rotation region and without reducing torque responsiveness in the high-speed rotation region.

Now, the calculation of the advance angle executed in step P6 of the above-mentioned selection program is performed as follows. First, in this embodiment, the factors that determine the value of the advance angle are the rotational speed of the variable reluctance motor 1, the target value of the excitation current, and the change tendency of the inductance of the excitation winding. The reason why these are used as elements for calculating the lead angle is as follows.

7 (1) Reasons for considering the target values of rotational speed and excitation current In order to cause the excitation current of the target value to flow through the excitation winding of a variable reluctance motor at a predetermined timing, it is necessary to A power supply voltage corresponding to the back electromotive force e must be applied. This back electromotive force e has a magnitude proportional to the time change (dφ/dt) of the interlinkage magnetic flux φ, and
The magnetic flux linkage φ is the effective inductance of the variable reluctance motor expressed by the effective value of L1, and if the excitation current is ■, then
It is expressed as follows.

φ-LI (1) Therefore, the back electromotive force e is expressed by the following equation (2).

・・・・・・(2) In other words, the back electromotive force e is the time change of the exciting current I (d
I/d t), angular change in effective inductance L (d
L/dθ) and the angular velocity ω.

Of these variables, the angular change (dL/dθ) of the effective inductance L represents the amount of angular change in the effective inductance L during the increasing period or decreasing period of the inductance L of the variable reluctance motor, and is the control target. This can be known in advance as the value of the hard H of the variable reluctance motor.

Therefore, in order to accurately calculate the back electromotive force e generated in the excitation winding, the excitation current I and the angular velocity ω are essential information. Therefore, in this example, the back electromotive force e is estimated based on two pieces of information: the rotational speed of the variable reluctance motor and the target value of the exciting current, and then the lead angle is set to correct the timing of applying the exciting current. It calculates.

The above relationship can be explained more qualitatively as shown in FIG. Figures 4 (A) and (B) schematically show the changes in the excitation current that flow when PWM control is executed by applying voltage to the excitation winding of the iJ variable capacitor smoke at the same timing. It is expressed in (A) shows a case where the variable reluctance motor is operating at high speed and high load, and (B) shows a case where the variable reluctance motor is operating at low speed and light load.

In the case shown in (A), since the inductance is being rotated at high speed, the period of increase in inductance is short, a large back electromotive force acts, and a large current must be passed during this period. Therefore, compared to (B), the current rise and fall characteristics are greatly deteriorated. Therefore, by advancing the excitation start timing by a rotation angle θ1 from the start of the inductance increasing period and advancing the excitation end timing by a rotation angle θ2 from the end, the unnecessary excitation period (region A) is brought to a minimum value, and the drive It is possible to make the excitation period (region B) that effectively acts on torque as large as possible, and to control so that the excitation period (region C) in which braking torque is generated does not occur as much as possible.

However, if such excitation timing advance control is applied to all operating conditions of a zero variable reluctance motor, there will be a large drop in efficiency in operating conditions where the speed is low and the excitation current is small, as shown in (B). invite. That is, as shown in (B), when the current rise and fall characteristics are good, a large advance angle θ1. Due to θ2, the unnecessary excitation period (area A) becomes extremely large, the excitation period (area B) that actually generates the driving torque is eroded, and the excitation is continued while leaving the excitation period (area D) where the driving torque is obtained. It will be completed.

Therefore, when calculating the lead angle that determines the excitation timing of the variable reluctance motor, the rotation speed and the target value of the excitation current should be taken into consideration.

(2) Reason for considering the tendency of change in inductance of the excitation winding When voltage is applied to the excitation winding of the motor, the transient current flowing through the excitation winding depends on the time constant T(-L/R) of the excitation circuit. It rises slowly and falls slowly.

By the way, in the case of a variable reluctance motor, the inductance value always changes as a function of the rotation angle, and during the increasing period, the inductance value L1, that is, the time constant, gradually increases, and the change in current becomes slow at the end. . Also, in the decreasing period, the inductance value L5
That is, the time constant T gradually decreases, and the beginning of the change in current becomes slow.

This relationship is visually shown in FIGS. 5(A) and 5(B). The figure shows a case where an excitation current that is PWM-controlled and matched with a reference excitation period is passed through the excitation winding of a variable reluctance motor. (A) shows the case where excitation is performed during the increasing period in which the inductance L of the excitation winding gradually increases in order to generate driving torque in the variable reluctance motor, and (B) conversely shows the case where excitation is performed in the increasing period in which the inductance L of the excitation winding is used to generate a braking torque. The case is shown in which excitation is performed during a decreasing period in which the inductance L of is gradually reduced.

In the case shown in (A), at the beginning of the reference excitation period, the inductance value is small, so the rise and fall of the current are steep, but as the end of the excitation period approaches, the change in current becomes slower and the reference excitation Even after the period ends, unnecessary current flows throughout Changlang.

On the other hand, in the case shown in (B), a phenomenon opposite to that in (A) appears. That is, since the inductance value is large at the beginning of the reference excitation period, even if excitation is started, the excitation current rises only gradually, and effective excitation cannot be achieved. However, since the time constant T becomes small at the end of the reference excitation period, the period during which the excitation current continues to flow unnecessarily is short.

Therefore, by determining the change tendency of the inductance value during the period in which the excitation current is passed, the excitation period is advanced at least at the end or end of the excitation period when the inductance value is large, and the supply of the excitation current is effectively changed into mechanical torque. It is desirable to modify the reference excitation period as follows.

For the reasons described above, the lead angle is calculated by taking into account the rotational speed, the target value of the excitation current, and the change tendency of the inductance of the excitation winding.The functional block diagram of the lead angle control means in this embodiment When expressed as 3, it becomes as shown in Figure 6. The rotational position signal from the shaft encoder 2 is given to the speed detection means 17 and the inductance change tendency determination means]8. The speed detection means 17 determines the actual rotational speed of the variable reluctance motor 1 based on the rotational position signal. In addition, the inductance change tendency determining means 18 reads the inductance value or its change tendency itself with respect to the rotation angle of the rotor, which is stored in advance in the ROMI l, based on the rotation position signal indicating the rotation angle of the rotor. Determine whether the tendency of change in inductance is increasing or decreasing.

Further, the actual rotational speed detected by the speed detection means 17 is given to one speed deviation detection means, and the deviation from the set target rotational speed is detected here, and further based on the deviation, the target current determination means 20 The current to be passed through the excitation winding is determined by Information regarding the inductance change tendency, actual rotational speed, and target current determined as described above is then given to the advance angle calculating means 21, where the advance angle is calculated according to the three elements. The relationship between the calculation 4 result and each of the above elements is ideally as follows. This will be explained with reference to FIG.

As mentioned above, only the excitation current flowing through the excitation winding during the reference excitation period can generate the desired torque in the variable reluctance motor 1.
It works effectively to cause this to occur. Therefore, the advance angle X at the start is determined so that the excitation current at the start of the reference excitation period reaches the target current value according to the excitation signal. That is, the larger the target value of the excitation current based on the excitation signal is, the larger the advance angle X is set. In addition, the higher the rotation speed, the greater the back electromotive force generated in the excitation winding, and the rotation angle changes greatly during the period required for the current to rise, so the lead angle X is set large in this case as well. .

Furthermore, it is desirable that the lead angle X at the start is determined so that the excitation current completes its rise at the start of the reference excitation period and reaches the target current value based on the excitation signal. Therefore,
If the inductance during the reference excitation period is decreasing and the inductance at the beginning of the reference excitation period is large,
The lead angle X of the reference excitation period is set to be large by one hour required for the start-up. Conversely, when the inductance during the reference excitation period tends to increase, the inductance value at the beginning of the reference excitation period is small and rises steeply, and the advance angle X is set small.

On the other hand, the advance angle Y at the end of the reference excitation period is determined as follows. After the excitation current is terminated at an arbitrary advance angle Y, the excitation current gradually decreases due to the electromagnetic energy stored in the effective inductance of the excitation winding. Therefore, even after the reference excitation period for generating effective torque in the variable reluctance motor 1 ends, the excitation current remains and gradually decreases. However, after this reference excitation period ends, the angular change in effective inductance L (dL/dθ
) becomes a negative value, the polarity of the back electromotive force I (dL/dθ)ω shown in the second term on the right side of equation (2) is reversed,
A power generation phenomenon is observed that acts in the direction of increasing the remaining excitation current. If this power generation phenomenon becomes a large value compared to the time constant of a circulating circuit or the like that reduces the excitation current, the residual excitation current continues to flow and the variable reluctance motor 20 becomes uncontrollable. Therefore, the final advance angle Y is such that the maximum value of the excitation current at the end of the reference excitation period is smaller than the value that causes the variable reluctance motor 1 to become uncontrollable, and the current during the reference excitation period The advance angle is determined to have the maximum amount. In other words, the advance angle Y at this final stage
The larger the rotational speed and excitation current, the larger is determined. Also, this final stage advance angle Y is determined largely when the inductance during the base excitation period tends to increase and the final stage inductance is large, and when the inductance tends to decrease and the final stage inductance is small. , the advance angle Y is set small.

The advance angles X and Y with respect to the reference excitation period are determined based on the above theory, and as is clear from the above explanation, the theoretical values can be calculated by solving the circuit equation of the excitation circuit. Therefore, step P6 of the selection program
Now, by substituting the above three elements into the circuit equation created in advance based on the unique characteristics of the variable reluctance motor 1 and solving it, the optimum lead angle X and The excitation period is determined by calculating Y.

In the above embodiment, in step P7 of the selection program, the calculated lead angle is simply compared with a predetermined lead angle, but the invention is not limited to this, and for example, the lead angle may be compared with a predetermined lead angle. Set a predetermined advance angle,
It is also possible to prevent chattering when setting the selection flag near the boundary.

Further, in the above embodiment, step P7 of the selection program
Although the lead angle value as the calculation result is used as the criterion for determining the control method, the following criteria are not limited to this.

That is, for example, the actual rotational speed of the rotor or a preset target rotational speed may be used as the criterion, or
Both of these may be used as the determination criteria, or the value of a function calculated from these values may be used as the determination criteria. In this case, the purpose of using the target rotational speed as criterion 8 is to control the rotor so that it is maintained at the target rotational speed, so the normal rotational state is This is because the rotational speed is approximately in the vicinity of the target rotational speed. Further, when both are set to the 'l' and 11 cutting criteria, it is preferable to perform advance angle control under the condition that at least one of the actual rotational speed and the target rotational speed exceeds a predetermined value, for example.

When using the value of the function, for example, a value such as a magnification of a current pattern or a torque command value may be used as a criterion.

Furthermore, in the above embodiment, the actual rotational speed of the variable reluctance motor 1 is calculated and determined based on the rotational position signal of the shaft encoder 2. A rotation speed detector may also be provided.

[Effects of the Invention] As explained above, the variable reluctance motor control device of the present invention uses the control selection means to control the rotation of the variable reluctance motor based on at least one of the actual rotation speed and the set target rotation speed. The rotating state of the rotor is determined, and depending on the result of the determination, control by the current pattern control means is enabled in the low speed rotation region of the rotor, and control by the advance angle control means is enabled in the high speed rotation region of the rotor. did. As a result, the rotational state of the variable reluctance motor can be controlled to a stable rotational state without torque ripple in the low-speed rotation range, and the delay in excitation current due to the inductance of the excitation winding is eliminated in the high-speed rotation range, resulting in rotation with good torque response. can be controlled to the state,
This provides an excellent effect in that control can be performed stably and efficiently over a wide range of rotational speeds.

[Brief explanation of the drawing]

Figure 1 is a functional block diagram showing the basic configuration of the present invention, Figure 2 is a functional block diagram showing the basic configuration of the present invention.
The figure is an electrical configuration diagram showing one embodiment of the present invention, and FIG.
) and (b) are flowcharts showing the selection program and output program of the same control circuit, and FIGS.
The figure shows a current waveform diagram to explain the unresolved problems of the conventional control device for a variable reluctance motor. The figure is a waveform diagram of the excitation current applied to the excitation winding in the embodiment of the present invention, and FIG. 8 is an action explanatory diagram showing excitation current control in a conventional example. In the drawing, 1 is a variable reluctance motor, 2 is a shaft encoder (rotational position detection means), 3 is an excitation circuit (excitation means), 6 is a PWM control circuit, 9 is a control circuit (lead angle control means, current pattern control means, control selection means), 10 is a CPU, 11 is a ROM (current pattern storage means), 13
is a 110 circuit, 14 is a D/A conversion circuit, and 15 is an input circuit.

Claims (1)

[Claims] 1. Excitation means for controlling the current flowing through the excitation winding of the variable reluctance motor, rotational position detection means for detecting the rotational position of the rotor of the variable reluctance motor, and the rotor detected by the rotational position detection means. lead angle control means for operating the excitation means so that the energization period of the excitation current is in an advanced phase with respect to the excitation period for each excitation winding determined according to the rotational position of the rotor; and a current pattern storage means in which data of the excitation current is stored in advance; current pattern control means for operating the means; and determining the rotational state of the rotor based on at least one of an actual rotational speed and a set target rotational speed of the rotor, and controlling the rotational speed of the rotor according to the determination result. A control device for a variable reluctance motor, comprising: control selection means for enabling control by the current pattern control means in a low speed rotation region, and for enabling control by the advance angle control means in a high speed rotation region of the rotor.