JP2002233184A - Drive for reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent torque from lowering due to the delay of an energizing current and reduce noise and vibration, even at a high rotational speed. SOLUTION: By energizing each phase coil which is wound around a stator salient pole of a reluctance motor so that each energizing pattern turns into a trapezoidal wave, rotational torque is generated and a rotor rotates. By computing energizing current value, based on MAP1 of an inclination α1 at a low rotational speed of the rotor, MAP2 of an inclination angle α2 at an intermediate speed, and MAP3 of an inclination angle α3 at a high speed, MA of the rotational speed of the rotor (α1<α2<α3), the energizing pattern of each phase coil becomes the same form as that of the MAP used. Since the rotational speed is higher, the inclination angle of the MAP is increased more, so that the rising and falling of the current are carried out abruptly even at high rotational speed. The torque is suppressed from lowering, thereby reducing noise and vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus for a reluctance type electric motor of multi-phase single-wave conduction.

[0002]

2. Description of the Related Art Conventionally, a reluctance motor has the advantages of a large output torque and a simple structure, but has the disadvantage of high torque ripple, and has been applied only in some fields. Was staying at The outline of the structure of the reluctance motor and its driving principle will be described below.

As illustrated in FIG. 11, a reluctance motor 1 includes a stator 2 and a rotor 3 formed by laminating metal plates (for example, iron core forming plates), and three sets (U-phase) provided in the stator 2. , V-phase, W-phase) coils 4, 5, 6, etc. Twelve magnetic pole protrusions (hereinafter referred to as “stator salient poles”) 2 a to 2 m are provided at equal intervals on the inner peripheral portion of the stator 2.

[0004] Of these twelve stator salient poles 2a to 2m, the four stator salient poles 2a, 2d, 2g, and 2j form the U phase of the motor 1, and the other four stator salient poles 2b, 2b The V phase of the electric motor 1 is formed by 2e, 2h, 2k, and the remaining four stator salient poles 2c, 2f, 2
The W phase of the electric motor 1 is formed by i and 2m.
Then, the U-phase stator salient poles 2a, 2d, 2g, 2j,
V-phase stator salient poles 2b, 2e, 2h, and 2k and W-phase stator salient poles 2c, 2f, 2i, and 2m have coils 4 (U phase) and 5 (V Phase), 6 (W
Phase) is wound. The rotor 3 has eight magnetic pole protrusions (hereinafter referred to as “rotor salient poles”) on the outer periphery, is fixed to the rotating shaft 7, and is coaxially arranged on the inner periphery of the stator 2.

[0005] The reluctance motor 1 thus constructed is driven by a driving device (not shown) in a predetermined phase order (for example, U-phase → V-phase → W-phase) to form coils 4, 5, 6 of each phase.
To excite the stator salient poles of the energized phase by energizing
The rotor 3 is continuously rotated. Next, the driving principle of the reluctance motor 1 shown in FIG. 11 will be described with reference to FIG. As shown in FIG. 12, for example, when the rotor salient pole starts to face the stator salient pole 2a due to the rotation of the rotor 3 (electrical angle 0 °), the inductance of the coil 4 starts to increase, and the rotor salient pole and the stator salient pole 2a begin to increase. Are completely opposed (electrical angle θ1), the inductance becomes maximum.
When the coil 4 is energized during this period (inductance increase region), a positive rotation torque is generated in the rotor 3.

When the rotation of the rotor 3 further proceeds (electrical angles θ1 to θ2), the inductance of the coil 4 decreases. When the coil 4 is energized during this time (inductance reduction region), a negative rotation torque is generated in the rotor 3. Therefore, in order to continuously obtain a positive torque, the U phase, V phase, W phase
Current control may be performed so that a current value corresponding to a desired torque is supplied within a range in which the inductance characteristics of the coils 4, 5, and 6 of the respective phases are in an increasing region.

Although the inductance characteristic should ideally increase proportionally as shown by the broken line, magnetic saturation occurs as the two salient poles face each other. The torque decreases as the influence of the magnetic saturation increases, even if the current value is the same.

Conventionally, the above-described reluctance type electric motor 1 is energized (square wave energization) when the inductance characteristics of the coils 4, 5 and 6 of each phase are in an increasing region, and between the continuous phases. When the energization of the currently energized phase ends and the energization of the next phase is started at the same time, the energization of the phase coils 4, 5, and 6 is performed in sequence.

However, when the energization is controlled so that the energization pattern becomes a square wave, the current rises and falls sharply (although a delay is actually caused by the influence of inductance). Occasionally, torque ripple was generated, which was a cause of vibration and noise.

For example, Japanese Patent Application Laid-Open No. 1-298940 discloses that the current flowing pattern of each phase current is trapezoidal and the falling and rising of the current are made gentle. Vibration and noise can be reduced by reducing torque ripple. Also, in this case, since the rise and fall are made gradual, a predetermined time is required from the start of energization to the increase in the desired current value, and thus the torque may drop during a certain period before and after the switching of the energized phase. There is. Therefore, by setting the overlap energization to start the energization of the next phase before the energization of one phase is completed (that is, two consecutive phases are energized at the same time), the torque reduction as described above is suppressed, and the energization is performed. The phase switching is performed smoothly, so that the torque ripple can be reduced, so that noise and vibration can be reduced.

That is, as shown in FIG. 13, the energization pattern (current command by the drive circuit) of each phase is set to a trapezoidal wave (however, actually, the current is indicated by a broken line due to the influence of inductance). At the start of the fall of the energization pattern (electrical angle 120 °), the energization of the next V-phase is started to overlap the fall period of the U-phase current and the rise period of the V-phase current. The same applies to the switching of energization from the V phase to the W phase and from the W phase to the U phase.

[0012]

However, when the energization pattern is a trapezoidal wave as described above, vibration and noise can be reduced as compared with the case of a square wave, but the rise of the current is delayed at high speed rotation. As a result, there is a problem that the torque is reduced.

In other words, the trapezoidal wave not only requires a certain period of time from the start of energization until the desired current value is reached, but also the higher the rotation speed of the rotor 3 becomes, The rise time of the actual current with respect to the electrical angle including the influence of the inductance is longer, and the torque is reduced accordingly. Depending on the rotation speed, the energization of the phase may end in a state where the actual current does not completely rise (does not reach the maximum value of the energization pattern).

For this reason, at the time of high-speed rotation, torque ripple due to a delay in rising of current increases, noise and vibration also increase, and the output itself of the motor also decreases.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent a decrease in torque due to a delay in an energizing current and reduce noise and vibration even during high-speed rotation.

[0015]

According to a first aspect of the present invention, there is provided a driving apparatus for a reluctance type electric motor, wherein a phase winding is wound around a plurality of magnetic pole projections. And a rotor disposed opposite to the magnetic pole projections of the stator and having a different number of magnetic pole projections on the outer periphery than the magnetic pole projections of the stator. And energization control means for controlling energization to each phase winding.

The energization control means is arranged so that the energization pattern for the electric angle to each phase winding becomes a trapezoidal wave, and that the energization patterns for each successive phase overlap with each other for changes in the electrical angle. Then, current is supplied to each phase winding in a predetermined phase order. In the driving device of the present invention, the energization control unit increases the inclination angle of the trapezoidal wave as the rotation speed of the rotor increases,
Change the energization pattern.

The term “multiphase single-wave energization” used herein refers to, for example, FIG.
As in the energization method shown in FIG. 3, the coil (phase winding) wound around each stator salient pole of the stator 2 (corresponding to the stator) is always energized in one direction only and the stator has a single pole. (So-called unipolar drive).

That is, the energization control means energizes the phase windings to obtain a desired torque based on, for example, a trapezoidal wave energization pattern as shown in FIG. Are overlapped with each other (for example, in FIG. 13, the overlap energization of the U-phase and the V-phase corresponds to this). In the present invention, however, the rising / falling inclination angles of the trapezoidal wave are further adjusted by the rotor. The higher the rotation speed, the greater the speed.

As described above, at the time of high-speed rotation, the rise of the actual current with respect to the electrical angle is delayed, and as the speed becomes higher, the effect becomes more remarkable. If the falling slope angle is increased (that is, if the steepness is increased), the current response becomes faster and changes more quickly to a desired current value (the maximum value of the energization pattern).

Therefore, according to the driving device of the first aspect, even at the time of high-speed rotation, torque reduction and torque ripple due to delay of rise and fall of the conduction current can be suppressed, and noise and vibration can be reduced. Becomes possible. still,
Here, “increase as the speed increases” is not necessarily limited to continuously increasing according to the speed.
For example, it is also possible to set a constant inclination angle up to a certain predetermined speed, and change the inclination angle to a larger one when the predetermined speed is exceeded (that is, there are two types of inclination angles, which are used depending on whether or not the predetermined speed is exceeded). For example, the inclination angle may be greater at high speed than at low speed when viewed as a whole speed range.

By the way, the timing of starting the energization of the phase windings of each phase is usually determined when the magnetic pole projections of the stator and the rotor start to face each other (that is, when the increase of the inductance starts, as described in the related art). ). In this case, even if the inclination angle of the trapezoidal wave of the energization pattern is increased at the time of high-speed rotation, the actual current rise delay always occurs to some extent. It takes a predetermined period from when the magnetic pole projections start to face each other until the current rises to a desired current value. The rise delay causes torque ripple, and the output is reduced.

Therefore, as described in claim 2, the energization start timing for each phase is appropriately advanced from the normal start timing when both magnetic pole projections begin to oppose, and energization is started in a region where the inductance is small. Good to do. That is, the drive device for a reluctance motor according to claim 2 is the drive device according to claim 1, wherein the energization pattern is such that the magnetic pole projections of the stator and the rotor face each other at least when the rotor is rotating at high speed. Before starting the operation, the current supply to the phase winding wound around the magnetic pole projection of the stator is started.

As described above, if the energization is started before the respective magnetic pole projections start to oppose, the inductance is small, so that the rise of the actual current is quickened. Since it has risen to a value or a value close to the desired current value, a sufficient torque can be obtained from the beginning of the opposing magnetic pole projections. Moreover, since the energization start timing is advanced, the overlap period of energization of each successive phase also increases,
The effect of torque reduction due to magnetic saturation can also be suppressed, and torque ripple reduction and noise / vibration reduction effects can be further enhanced.

At this time, if the advance amount of the power supply start timing is set to increase as the rotation speed increases, for example, the influence of the current response delay at the time of high speed rotation can be reduced. Since it is possible to obtain sufficient torque from the time when each magnetic pole projection starts to oppose,
More preferred.

Here, as described in the second or third aspect, by making the energization start timing advanced from the normal energization start timing, a more sufficient torque can be obtained. (As a result, the energization period for the electrical angle is lengthened by the earlier start timing), depending on how the end timing is set, the energization may be performed even after the inductance characteristic has passed the peak and entered the decreasing region. Does not end, and a negative torque may be generated.

In view of this, for example, as described in claim 4, it is preferable that the energization pattern is further configured to advance the energization end timing with an advance amount of the energization start timing or less. In this way, since the current response in the latter half of the energization becomes faster and the inductance characteristic can be surely terminated before the inductance characteristic shifts to the decreasing region, the generation of the negative torque is suppressed to reduce the torque ripple. In addition, vibration and noise can be further reduced.

The drive device for a reluctance motor according to claim 5 is the drive device according to any one of claims 1 to 4, wherein the energization pattern has a waveform change when the trapezoidal wave rises and falls. Are configured to be continuous. Even if the energization pattern is trapezoidal, as already mentioned, the actual current does not suddenly change as the trapezoidal wave due to the influence of inductance, etc.
The term “continuous” as used in claim 5 specifically refers to a change in a trapezoidal wave that forms an energization pattern instead of an actual current (change at the start of rising, at the end of rising, at the start of falling, at the end of falling). Means smoothing.

As a result, the current flowing actually changes more smoothly, so that the torque changes smoothly and the connection of the torque at the time of switching the energized phase is performed more smoothly, so that vibration and noise can be further reduced. .

[0029]

Preferred embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] The reluctance motor of the present embodiment is the same as the reluctance motor 1 of FIG. 11 already described in the section of the prior art, so that the following description will be made based on FIG. Further, the structure and the driving principle of the reluctance type electric motor 1 of FIG. 11 are as described above, and the detailed description thereof will be omitted here.

FIG. 4 shows a driving device 8 for driving the reluctance motor 1 of the present embodiment. As shown in FIG. 4, the driving device 8 of the present embodiment includes the phase coils 4, 5,
6, semiconductor switching elements 9 (9a, 9b, 9c), 10 (10a, 10b,
10c) and diodes 11 (11a, 11b, 11c), 12 (12) for regenerating the coil accumulated energy to the battery 15 at the end of energization of the coils 4, 5, and 6 of each phase.
a, 12b, 12c), a current sensor 13 for detecting a current flowing through each phase coil 4, 5, 6 and an energization control circuit 14 for controlling the open / close state of each switching element 9, 10 (the energization control means of the present invention). ).

The current sensor 13 includes a coil 4 for each phase,
The current flowing through each of the phase coils 4, 5, and 6 is provided on the side of each of the phase coils 4, 5, and 6 from the connection point between the switching element 9 and the diode 11 connected to one end of each of the phases 5 and 6; As a matter of course, it is also possible to collectively detect (as a total current).

The energization control circuit 14 determines the phase to be energized based on a rotor position signal from a rotor position sensor (not shown) for detecting the rotational position of the rotor 3, and based on the determination result, the switching elements 9, 10 Is opened and closed to control the energization of the coils 4, 5, and 6 of each phase.

Further, the energization control circuit 14 also calculates the rotation speed of the rotor 3 based on the rotor position signal, and further performs feedback control so that the actual current of each phase coil 4, 5, 6 becomes equal to the command current value. Therefore, the energizing current value (actual current) of each phase detected by the current sensor 13 is also fed back. Then, a current command value (energization pattern) to be energized to each of the phase coils 4, 5, and 6 is calculated based on the position, the rotation speed, and the like of the rotor 3, and each switching element 9 is monitored while monitoring the actual current fed back. , 10 are controlled to open and close (PWM control in this embodiment), so that energization corresponding to the current command value is performed.

Next, the operation of the reluctance motor 1 of this embodiment will be described with reference to FIGS. FIG. 1 is a flowchart showing the energization control process of the reluctance type electric motor 1, which is executed by a microcomputer (not shown) provided in the energization control circuit 14 as the energization control means. In the microcomputer,
The processing is executed according to a power supply control processing program stored in a ROM (not shown).

When this process is started, first, in step (hereinafter abbreviated as "S") S110, the position of the rotor 3 is detected based on the rotor position signal from the rotor position sensor. The position of the rotor 3 is detected as an electrical angle, whereby it is simultaneously determined which phase should be energized. S12
At 0, the rotation speed of the rotor 3 is calculated based on the rotor position signal, and at S130, the rotation speed becomes 500 r.
pm or less. Here, 500 rp
If the rotation speed is lower than m, an affirmative determination is made and the process proceeds to S140, where MAP1 shown in FIG. 2A is selected. MAP1
Means that both the rising and falling inclination angles are α1
It is a trapezoidal wave.

The MAP1 is a basis for determining an energizing pattern of a current to be applied to each phase, and is recorded as a map value in a ROM (not shown) in the microcomputer. Figure 2
MAP2 and MAP3 shown in (b) and (c) are also recorded.

Then, based on MAP1 selected in S140, a MAP value is read in S150. That is,
Since the rotational position of the rotor 3 has already been detected in S110, the MAP value corresponding to the detected rotational position (electrical angle) is read for each phase. At this time, the energization start timing for each phase is 0 electrical degrees of MAP1.
, So that the same MAP1 can be used in energization of all phases U, V, and W.

After obtaining the MAP value corresponding to the rotational position for each phase in this way, the process proceeds to S160, and the target current (ie, the current command value to be actually supplied) is calculated. Specifically, first, a desired current value (amplitude of the energization pattern) to be energized to each of the phase coils 4, 5, and 6 is calculated based on the position, the rotation speed, and the like of the rotor 3, and the MAP value is calculated as the current value. By the multiplication, a current command value (energization pattern) for each phase according to the rotational position is calculated. Then, in S170, actual energization control based on the current command value for each phase coil 4, 5, 6 is performed, that is, P
WM control is performed.

On the other hand, if the rotation speed exceeds 500 rpm and
When the rotation speed is 000 rpm or less, the negative determination is made in S130 and the affirmative determination is made in S180, and the process proceeds to S190. In S190, MAP2 having the inclination angle α2 shown in FIG. 2B is selected, and thereafter, the processes in and after S150 are executed, and power is supplied according to the map value of MAP2. If the rotation speed is higher than 2000 rpm, a negative determination is made in S180, and the process proceeds to S200, where MAP3 having the inclination angle α3 shown in FIG. 2C is selected. Thereafter, the processes in and after S150 are executed, and MA
Energization is performed according to the map value of P3.

The difference between the MAPs 1 to 3 is the inclination angle of the rise and fall of the trapezoidal wave.
Has a relationship of α1 <α2 <α3. That is, in the present embodiment, the higher the rotation speed is, the larger the inclination angle is.

As described above, the actual energization is controlled, for example, as shown in FIG. 3 by controlling the energization of each phase coil. FIG. 3 is an explanatory diagram showing the energization pattern, the actual current, and the generated torque of each phase (W-phase is omitted) when MAP3 is selected (that is, at the time of high-speed rotation). FIG.
As compared with the conventional energizing pattern (corresponding to the shape of the MAP 1 of the present embodiment), the energizing pattern has a larger rising / falling inclination angle and the actual current rises faster, resulting in reduced torque ripple. I have.

Therefore, according to the driving device 8 of the present embodiment, by changing the MAP to be used in accordance with the rotation speed, the torque reduction and the torque due to the delay of the rise and fall of the conduction current even at high speed rotation. Ripple can be suppressed, and noise and vibration can be reduced.

[Second Embodiment] In this embodiment, as in the first embodiment, the reluctance motor 1 shown in FIG. 11 is driven by the driving device 8 shown in FIG. The control of the actual energization to 4, 5, and 6 is also controlled according to the energization control process shown in FIG.

This embodiment is different from the first embodiment in that the MAP used in the energization control process of FIG.
In this embodiment, MAPs 1 to 3 shown in FIGS. 5A to 5C are selected and used. That is, in the present embodiment, the timing of starting the energization of each phase coil is advanced by, for example, 20 ° from the timing at which the stator salient poles and the rotor salient poles begin to face each other (electrical angle 0 °). The energization is already started before the opposition starts. At the time of low-speed rotation of 500 rpm or less, FIG.
Using MAP1 of (a), 20
At the time of medium speed rotation of less than 00 rpm, MAP2 in FIG.
Fig. 5 at high speed rotation over 2000 rpm
(C) MAP3 is used. Incidentally, the inclination angles of the trapezoidal waves of the respective MAPs 1 to 3 are the same as those of the MAPs 1 of the first embodiment.
Α3, α2, and α3 (see FIG. 2).

By controlling the energization by advancing the energization start timing in this way, the actual energization is, for example, as shown in FIG. FIG. 6 is an explanatory diagram showing the energization pattern and the actual current of each phase (W-phase is omitted) when MAP3 is selected (that is, at the time of high-speed rotation). Since the rise timing of the energization pattern is advanced compared to the energization pattern of the first embodiment shown in FIG. 3, when the rise of the actual current is quickened and the two salient poles start to face each other, the desired current value ( (The amplitude value of the energization pattern), and the overlap energization period between the U and V phases (continuous phases) is long.

Therefore, according to the present embodiment, a sufficient torque can be obtained from the beginning of the opposing salient poles. In addition, the effect of torque reduction due to magnetic saturation in the latter half of energization can be suppressed by increasing the overlap period, and the effect of reducing torque ripple and reducing noise and vibration can be further enhanced.

In the present embodiment, the amount of advance of the energization start timing is always constant irrespective of the speed. However, the present invention is not limited to this. The angle may be advanced by a fixed amount (−20 ° in electrical angle) only in the range. Further, for example, by increasing the advance amount in proportion to the speed, the advance angle may be changed in the entire speed range and the advance amount may be changed (increased as the speed increases). With this configuration, the influence of the current response delay can be appropriately reduced according to the rotation speed, and the output can be increased and the torque ripple can be reduced in the entire rotation speed region.

Third Embodiment Like the second embodiment, the third embodiment is the same as the first embodiment except that the MAP used in the energization control process of FIG. 1 is different. In addition, the energization to each phase coil is controlled according to the energization control process shown in FIG. The MAPs used in the present embodiment are the MAPs 1 shown in FIGS.
-3, which are the MAPs used in the second embodiment.
The energization end timing is further advanced (15 ° in this embodiment) with respect to 1 to 3 (see FIG. 5).

As described above, the actual energization is performed as shown in FIG. 8 by controlling the energization by advancing the energization end timing in addition to the energization start timing. FIG. 8 is an explanatory diagram showing the energization pattern and the actual current of each phase (W-phase is omitted) when MAP3 is selected (that is, at the time of high-speed rotation). Since the rise timing of the energization pattern is advanced compared to the energization pattern of the first embodiment shown in FIG. 3, the energization end timing is further advanced in the present embodiment. When the inductance characteristic of the coil shifts to the decrease region, the energization (actual current) has already been completed.

Therefore, according to the present embodiment, the current supply can be reliably stopped before the current response in the latter half of the current supply becomes faster and the inductance characteristic shifts to the decreasing region, so that the generation of the negative torque is suppressed. As a result, torque ripple can be reduced, and vibration and noise can be further reduced. In this embodiment, the advance amount of the power supply end timing may be changed according to the speed.

[Fourth Embodiment] The fourth embodiment is the same as the second and third embodiments, except that the MAP used in the energization control process of FIG. 1 is different from the first embodiment. The energization to each phase coil is controlled in accordance with the energization control process shown in FIG. The MAPs used in the present embodiment are the respective MAPs shown in FIGS.
AP1 to AP3, which are different from the MAP1 to MAP3 used in the first embodiment (see FIG. 2) so that the waveform change at the rise and fall of the trapezoidal wave is continuous (smooth). It is composed. Therefore, although not shown, the actual energization pattern is also the same as that of the first embodiment shown in FIG.
In the energization pattern shown in (1), the trapezoidal wave changes smoothly.

For this reason, in the present embodiment, since the current actually flowing through each phase coil changes more smoothly, the torque change becomes smoother and the connection of the torque at the time of the energized phase switching is performed more smoothly. As shown in 10,
Vibration and noise can be further reduced. Note that FIG.
10A shows the generated torque and vibration when the energization pattern is simply a trapezoidal wave, and FIG. 10B shows the generated torque and vibration when the waveform change of the trapezoidal wave is smoothed using the map of FIG. FIG.

The embodiments of the present invention are not limited to the above-described embodiments, and it goes without saying that various forms can be adopted as long as they fall within the technical scope of the present invention. For example, in the first embodiment, the rotation speed of the rotor 3 is divided into three regions, and MAP1 (the inclination angle of the trapezoidal wave is α1) during low-speed rotation, and MAP2 (the inclination angle of the trapezoidal wave when the rotation speed is medium). α2) and MAP3 (the inclination angle of the trapezoidal wave is α3) at the time of high-speed rotation to calculate the current command value. However, the present invention is not limited to this. For example, the inclination of the rising and falling of the trapezoidal wave is calculated. The angle may be changed proportionally according to the speed.

Specifically, for example, the basic MAP
Only one MAP (for example, MAP1 shown in FIG. 2A) is prepared, and the MAP value is added to the basic MA according to the speed.
The sum of the inclination change rate coefficient a (for example, a coefficient that increases in proportion to the speed) for changing the inclination angle of P is set as the final MAP value. In this case, the basic M
When the inclination change rate coefficient a is added to the AP, the maximum value (amplitude) of the MAP value increases as the inclination angle increases (1 + a). Therefore, the upper limit of the MAP value is “1”.
If the value exceeds 1 due to the addition of the coefficient a, it is uniformly treated as “1”. In this manner, as the rotation speed increases, the amplitude of the basic MAP remains unchanged ("1"), and only the inclination angle can be increased.

By multiplying the thus obtained MAP value having a tilt angle corresponding to the speed by a desired current value (amplitude of the energization pattern), a trapezoidal wave having a tilt angle corresponding to the speed is obtained. The energization pattern is formed based on.
In this way, compared to using the same MAP in a certain speed range as in the first embodiment, it is possible to conduct electricity based on a more appropriate MAP according to the speed, and further reduce torque ripple, vibration, and noise. It becomes.

In the second embodiment, the amount of advance of the energization start timing is advanced, for example, by 20 ° from the timing at which the two salient poles start to oppose each other (electrical angle 0 °).
In the above-described third embodiment, the advance amount of the power supply end timing is set to, for example, 15 °. What is necessary is just to set suitably according to etc.

Further, in the above embodiment, the case where the present invention is applied to the reluctance type electric motor as shown in FIG. 11 has been described. It can be applied to multi-phase single-wave conduction.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a reluctance type motor energization control process executed by a microcomputer in an energization control circuit.

FIG. 2 is an explanatory diagram showing each map of the first embodiment.

FIG. 3 is an explanatory diagram showing an energization pattern, an actual current, and a generated torque when MAP3 is selected according to the first embodiment.

FIG. 4 is an explanatory diagram illustrating a schematic configuration of a drive device for a reluctance motor.

FIG. 5 is an explanatory diagram showing each map of the second embodiment.

FIG. 6 is an explanatory diagram showing an energization pattern and an actual current when MAP3 is selected according to the second embodiment.

FIG. 7 is an explanatory diagram showing each map of the third embodiment.

FIG. 8 is an explanatory diagram showing an energization pattern and an actual current when MAP3 is selected according to the third embodiment.

FIG. 9 is an explanatory diagram showing each map of the fourth embodiment.

FIGS. 10A and 10B are explanatory diagrams for explaining that vibration is reduced by smoothly changing a trapezoidal wave. FIG. 10A is an explanatory diagram when a conduction pattern is a trapezoidal wave, and FIG. FIG. 9 is an explanatory diagram in the case where is smoothed.

FIG. 11 is an axial front view showing a schematic structure of a reluctance electric motor.

FIG. 12 is an explanatory diagram showing inductance characteristics.

FIG. 13 is an explanatory diagram showing inductance characteristics, a conduction current, and a generated torque of each phase.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reluctance type electric motor, 2 ... Stator, 2a, 2
b, 2c ... salient stator poles, 2b ... salient stator poles, 2c ...
Stator salient pole, 3 ... rotor, 4, 5, 6 ... coil, 7 ...
Rotating shaft, 8 ... drive device, 9, 10 ... switching element,
11, 12: diode, 13: current sensor, 14: energization control circuit, 15: battery

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideharu Yoshida 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Shinji Makita 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Denso Corporation (72) Inventor ▲ Taka ▼ Department Yoshiyuki 390 Umeda, Kosai-shi, Shizuoka Prefecture Asmo Co., Ltd.In-house F-term (Reference) UA10 XA02

Claims (5)

[Claims] 1. A stator having a phase winding wound around a plurality of magnetic pole projections, and a plurality of magnetic pole projections arranged opposite to the magnetic pole projections of the stator. A multi-phase, single-wave energizing reluctance motor having a rotating section, wherein the energizing pattern with respect to the electrical angle to each phase winding is a trapezoidal wave, and the energizing pattern of each continuous phase is Is a drive device including energization control means for energizing each of the phase windings in a predetermined phase order so that they overlap with each other with respect to changes in the electrical angle, wherein the energization control means includes: A drive device for a reluctance electric motor, wherein the energization pattern is changed such that the higher the rotation speed of the rotor, the larger the inclination angle of the rise and fall of the trapezoidal wave. 2. The energization pattern is wound around the magnetic pole projections of the stator before the magnetic pole projections of the rotor start to face the magnetic pole projections of the stator at least when the rotor rotates at high speed. The drive device for a reluctance type electric motor according to claim 1, wherein the current supply to the phase winding is started. 3. The energization pattern so that energization to a phase winding wound around the magnetic pole projections of the stator is started before the magnetic pole projections of the rotor start to oppose the magnetic pole projections of the stator. In the configuration, the energization pattern is further configured such that, as the rotation speed increases, the amount of advance of the energization start timing based on the timing at which the magnetic pole projections start to oppose increases. The driving apparatus for a reluctance type electric motor according to claim 2, wherein: 4. The power supply pattern according to claim 3, wherein the power supply end timing is advanced when the power supply start timing is equal to or less than an advance amount of the power supply start timing.
A drive device for the reluctance motor described. 5. The reluctance according to claim 1, wherein the energization pattern is configured such that waveform changes at the time of rising and falling of the trapezoidal wave are continuous. Device for type electric motor.