CN108419451B - Two-phase rotating electric machine control device and control system for two-phase rotating electric machine - Google Patents

Abstract

The present invention relates to a two-phase rotating electric machine control device and a two-phase rotating electric machine control system. A two-phase rotating electrical machine control device that controls a two-phase three-wire rotating electrical machine having two coils, wherein a current flowing through a target coil whose direction of an excitation current is switched can be returned before switching control for switching the direction of the excitation current flowing through any one of the two coils is executed.

Description

Two-phase rotating electric machine control device and control system for two-phase rotating electric machine

This application claims priority based on japanese patent application No. 2015-220594 filed 11/10 in 2015, the contents of which are incorporated herein by reference.

Technical Field

The present invention relates to a two-phase rotating electric machine control device and a two-phase rotating electric machine control system.

Background

Conventionally, there is known a rotating electrical machine control device that controls driving of a rotating electrical machine by controlling on/off operations of switching elements of an inverter circuit. For example, in a rotating electrical machine control device, a control unit generates a command signal for commanding an on/off operation of a switching element, and a gate driver circuit generates a gate signal of the switching element based on the command signal. When the gate signal generated by the gate driver circuit is output to the gate of the switching element, the switching element performs an on/off operation based on the gate signal, and the rotating electric machine is rotationally driven.

For example, there is a rotating electrical machine control device that controls driving of a two-phase rotating electrical machine, and the rotating electrical machine control device supplies power in a two-phase three-wire system. Fig. 9 is a schematic configuration diagram of a conventional two-phase rotating electrical machine control system 100 including a rotating electrical machine control device 120 that controls driving of two-phase rotating electrical machines. The two-phase rotating electrical machine control system 100 includes a power supply device 110, a rotating electrical machine control device 120, an inverter circuit 130, and a two-phase (a-phase and B-phase) rotating electrical machine 140. The rotating electric machine control device 120 controls on/off of the switching elements Q100 to Q600 to switch the direction of the current flowing through the a-phase or the B-phase, thereby rotationally driving the rotating electric machine 140.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2004-248466

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional rotating electric machine control device, when the direction of the current flowing through the a-phase or the B-phase is switched, the through current 200 may be generated, and the switching element Q200 and the switching element Q500 may be damaged. In addition, when the direction of the current flowing through the a-phase or the B-phase is switched, a counter electromotive force is generated in the coil of the switched phase. Therefore, a period in which the current supplied from the power supply device 110 does not flow through the a-phase coil and the B-phase coil occurs. This causes a period in which torque for rotating the rotating electric machine 140 is not generated, and the effect of the inverter circuit 130 is reduced.

The invention provides a two-phase rotating electrical machine control device and a two-phase rotating electrical machine control system, wherein the two-phase rotating electrical machine control device controls a two-phase three-wire rotating electrical machine, prevents the generation of a through current and prevents the generation of no torque of the rotating electrical machine when switching the direction of a current flowing through each phase.

Means for solving the problems

One aspect of the present invention is a two-phase rotating electrical machine control device that controls a two-phase three-wire rotating electrical machine including two coils and is capable of returning a current flowing through a target coil whose direction of an exciting current is switched before switching control for switching the direction of the exciting current flowing through any one of the two coils is executed.

In addition, an aspect of the present invention is the two-phase rotating electrical machine control device that returns the current flowing through the target coil while maintaining the direction of the excitation current flowing through another coil different from the target coil that switches the direction of the excitation current.

In addition, an aspect of the present invention is a control system for a two-phase rotating electric machine, including: a two-phase three-wire rotating electrical machine having two coils; and a two-phase rotating electrical machine control device that controls the rotating electrical machine, and the two-phase rotating electrical machine control device is capable of causing a current flowing through a subject coil, the direction of which is switched between the excitation currents, to flow back before switching control that switches the direction of the excitation current flowing through any one of the two coils is executed.

ADVANTAGEOUS EFFECTS OF INVENTION

As described above, the aspect of the present invention provides a two-phase rotating electrical machine control device that controls a two-phase three-wire rotating electrical machine, and prevents the generation of a penetration current and the non-generation of a torque of the rotating electrical machine (non-generation state) when switching the direction of a current flowing through each phase, and a control system for a two-phase rotating electrical machine.

Drawings

Fig. 1 is a diagram showing an example of a schematic configuration of a two-phase rotating electric machine control system 1 including a two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 2 is a diagram showing an example of a schematic configuration of the two-phase rotating electric machine 30 according to embodiment 1.

Fig. 3A is a diagram illustrating an energization pattern #1 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3B is a diagram illustrating an energization pattern #2 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3C is a diagram illustrating an energization pattern #3 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3D is a diagram illustrating an energization pattern #4 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3E is a diagram illustrating an energization pattern #5 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3F is a diagram illustrating an energization pattern #6 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3G is a diagram illustrating an energization pattern #7 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 3H is a diagram illustrating an energization pattern #8 of the two-phase rotating electric machine control device 40 according to embodiment 1.

Fig. 4 is a diagram showing an example of the switching time points of the respective energization patterns #1 to #8 of the two-phase rotating electrical machine control device 40 in embodiment 1.

Fig. 5 is a diagram showing an example of the timing of switching the energization mode by the two-phase rotating electric machine control device 40 according to the modification of embodiment 1.

Fig. 6 is a diagram showing an example of a schematic configuration of a two-phase rotating electric machine control system 1A including a two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7A is a diagram illustrating an energization pattern #1 of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7B is a diagram illustrating an energization pattern # 2' of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7C is a diagram illustrating an energization pattern #3 of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7D is a diagram illustrating an energization pattern # 4' of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7E is a diagram illustrating an energization pattern #5 of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7F is a diagram illustrating an energization pattern # 6' of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7G is a diagram illustrating an energization pattern #7 of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 7H is a diagram illustrating an energization pattern # 8' of the two-phase rotating electric machine control device 40A according to embodiment 2.

Fig. 8 is a schematic diagram of a coil group in which a plurality of coils are connected in parallel and in series.

Fig. 9 is a schematic configuration diagram of a conventional two-phase rotating electrical machine control system 100 including a rotating electrical machine control device 120 that controls driving of two-phase rotating electrical machines.

Description of the symbols

1: control system for two-phase rotating electric machine

10: power supply device

20: inverter circuit

30: two-phase rotating electrical machine

30 a: a phase coil

30 b: b-phase coil

31: rotor

32: stator

33: rotor magnet

34: tooth

36: winding the main body part

37: front end part

38: trough

39: armature coil

40: two-phase rotating electric machine control device

211-216: switching element

Detailed Description

The embodiments of the present invention will be described below with reference to the embodiments of the present invention, but the embodiments below do not limit the invention according to the claims. In addition, all combinations of the features described in the embodiments are not essential to the solution of the invention. In the drawings, the same or similar components are denoted by the same reference numerals, and redundant description thereof may be omitted. In addition, the shapes, sizes, and the like of elements in the drawings may be exaggerated for more clear description.

The two-phase rotating electrical machine control device according to the embodiment is a two-phase rotating electrical machine control device that controls a two-phase three-wire rotating electrical machine including two coils, and is capable of returning a current flowing through a target coil, the direction of which is switched between excitation currents, before switching control for switching the direction of the excitation current flowing through any one of the two coils is executed.

Hereinafter, a two-phase rotating electrical machine control device according to an embodiment will be described with reference to the drawings.

(embodiment 1)

Fig. 1 is a diagram showing an example of a schematic configuration of a two-phase rotating electric machine control system 1 including a two-phase rotating electric machine control device 40 according to embodiment 1. As shown in fig. 1, the control system 1 for a two-phase rotating electrical machine includes a power supply device 10, an inverter circuit 20, a two-phase rotating electrical machine 30, and a two-phase rotating electrical machine control device 40.

Fig. 2 is a diagram showing an example of a schematic configuration of the two-phase rotating electric machine 30 according to embodiment 1.

The two-phase rotating electrical machine 30 is, for example, an outer rotor type rotating electrical machine mounted on a motorcycle. The two-phase rotating electrical machine 30 includes a closed-end cylindrical rotor (flywheel) 31 that rotates in synchronization with a crankshaft (not shown) of the engine, and a stator 32 fixed to an engine block (not shown).

The stator 32 is disposed radially inward of the rotor 31. Two-phase coils, i.e., an a-phase coil 30a and a B-phase coil 30B, are wound around the stator 32. In the present embodiment, each of the a-phase coil 30a and the B-phase coil 30B is a coil group including a plurality of coils. The phase a coil 30a and the phase B coil 30B are not limited thereto, and may include at least one coil.

In the peripheral wall 31c of the rotor 31, a plurality of tile-shaped rotor magnets 33 are arranged on the inner peripheral surface side in the circumferential direction in order of magnetic poles. The rotor magnet 33 is, for example, a ferrite magnet. On the other hand, the stator 32 includes a plurality of teeth 34 protruding radially outward.

The teeth 34 are formed in a substantially T-shaped cross section. The plurality of teeth 34 are arranged at equal intervals in the circumferential direction. The teeth 34 include a winding body portion 36 and a tip portion 37.

The winding main body portion 36 is formed so as to extend in the radial direction.

The distal end portion 37 is integrally formed at the radially outer distal end of the winding main body portion 36 and extends in the circumferential direction. The distal end portion 37 is formed so that the circumferential center portion is positioned at the distal end of the winding main body portion 36. Further, ant-groove-like grooves 38 are formed between the adjacent teeth 34. The armature coil 39 is wound around each tooth 34 provided with an insulating insulator (not shown) by passing the armature coil 39 through the slot 38. That is, the a-phase coil 30a or the B-phase coil 30B is wound around each tooth 34 by passing the corresponding a-phase coil 30a or B-phase coil 30B through each slot 38. In embodiment 1, the a-phase coil 30a is wound around six teeth 34 present in the X portion in fig. 2. The B-phase coil 30B is wound around six teeth 34 existing in the Y portion in fig. 2. In embodiment 1, the armature coil 39 wound around the six teeth 34 present in the X portion in fig. 2 is referred to as an a-phase coil 30a, and the armature coil 39 wound around the six teeth 34 present in the Y portion in fig. 2 is referred to as a B-phase coil 30B.

The number of magnetic poles (the number of rotor magnets 33) P and the number of teeth 34S in the two-phase rotating electrical machine 30 will be described below. In the two-phase rotating electrical machine 30, when the armature coil 39 is supplied with current supplied from the power supply device 10, magnetic flux is generated in the teeth 34, and magnetic attraction or repulsion is generated between the magnetic flux and the rotor magnet 33 of the rotor 31, thereby rotating the rotor 31.

However, when the segment-type rotor magnet 33 is used, since a gap is formed between the rotor magnets 33, the change in magnetic flux becomes large with both ends of the rotor magnet 33 in the circumferential direction as a boundary. Therefore, when each tooth 34 passes through both ends of the rotor magnet 33, the magnetic attraction force or repulsion force with respect to each tooth 34 is largely changed, and the cogging torque (cogging torque) becomes large. Therefore, the number P of magnetic poles and the number S of teeth 34 are set so as to satisfy the following expression (1), thereby providing the two-phase rotating electrical machine 30 with a low cogging torque.

Number of teeth S4 n

Multiple suspension of magnetic pole P ═ S. + -. 2 · (1)

Further, n is a natural number. Wherein, when n is less than or equal to 2, the contribution to the reduction of the cogging torque is small. Further, even if the number P of magnetic poles and the number S of teeth 34 are integral multiples, equation (1) holds.

Hereinafter, a case where the two-phase rotating electrical machine 30 has a low cogging torque when the number P of magnetic poles and the number S of teeth 34 satisfy expression (1) will be described.

An inter-pole angle (mechanical angle) θ as an angle between adjacent rotor magnets 33₁Represented by the following formula (2).

Interpolar angle of permanent magnet (mechanical angle)

In addition, an angle (mechanical angle) θ between adjacent teeth 34 in the stator 32₂Represented by the following formula (3).

Tooth space angle (mechanical angle) of stator

According to equations (2) and (3), the phase difference (electrical angle) α between the rotor magnet 33 and the tooth 34 is expressed by equation (4) below.

Phase difference

Here, when the angle is 0 ° when the center of the first tooth 34 coincides with the center of the rotor magnet 33, and the amplitude of the reverse voltage is 1, the resultant reverse voltage E is expressed by the following expression (5).

E＝sinθ+sin(θ-α)+sin(θ-2α)+…···(5)

As shown in equation (5), when the phase difference | α | becomes large, the section for canceling the reverse voltage becomes long, and the resultant reverse voltage E becomes low. On the other hand, when the phase difference | α | becomes small, the section for canceling the reverse voltage becomes short, and the combined reverse voltage E becomes high. That is, the closer the phase difference α is to 0, the better the efficiency of the two-phase rotating electrical machine 30. Here, since the phase difference α is expressed by the formula (4), it is preferable that the value of (the number P of magnetic poles)/(the number S of teeth 34) be close to 1. However, when the number P of magnetic poles and the number S of teeth 34 are the same value (P ═ S), the structure as a two-phase rotating electrical machine does not hold. In order to establish a structure as a two-phase rotating electrical machine, the number S of teeth 34 needs to be a multiple of 4, and the number P of magnetic poles needs to be a multiple of 2. Therefore, the two-phase rotating electrical machine 30 satisfies the equation (1), and thus has a low cogging torque and a two-phase rotating electrical machine with high efficiency. In embodiment 1, the number P of magnetic poles is 14, and the number S of teeth 34 is 12.

Returning to fig. 1, the inverter circuit 20 converts the dc power supplied from the power supply device 10 into ac power and applies the ac power to the two-phase rotating electrical machine 30. The inverter circuit 20 includes six switching elements 211 to 216. The inverter circuit 20 switches the switching elements 211 to 216 between on and off based on the drive signal supplied from the two-phase rotating electrical machine control device 40, and converts the dc power into the ac power.

The series-connected switching elements 211, 214, 212, 215, 213, and 216 are connected in parallel between the high potential side of the power supply apparatus 10 and the ground potential. One end of the a-phase coil 30a is connected to a connection point between the switching element 211 and the switching element 214. One end of the B-phase coil 30B is connected to a connection point between the switching element 213 and the switching element 216. The other end of the a-phase coil 30a and the other end of the B-phase coil 30B are connected to a connection point between the switching element 212 and the switching element 215. For example, the switching elements 211 to 216 are Field Effect Transistors (FETs) or Insulated Gate Bipolar Transistors (IGBTs). Each of the switching elements 211 to 216 may be connected in parallel to a free wheeling diode.

The two-phase rotating electrical machine control device 40 switches the energization mode for energizing the a-phase coil 30a and the B-phase coil 30B by controlling the on and off of the switching elements 211 to 216. That is, the two-phase rotating electric machine control device 40 controls the directions of the currents flowing through the a-phase coil 30a and the B-phase coil 30B by controlling the on and off of the switching elements 211 to 216. In other words, the two-phase rotating electrical machine control device 40 controls the on and off of the switching elements 211 to 216 so as to switch the direction of the current flowing through the a-phase coil 30a or the B-phase coil 30B, using a plurality of preset energization modes in sequence. Thus, the two-phase rotating electrical machine control device 40 switches the direction of the magnetic flux of the a-phase coil 30a or the B-phase coil 30B to generate an attractive force or a repulsive force between the rotor magnet 33 and the teeth 34, thereby rotating the rotor 31. Here, the two-phase rotating electrical machine control device 40 causes the current flowing through the armature coil 39, the direction of which is switched, to flow back to the armature coil 39 at the time point when the direction of the current flowing through the a-phase coil 30a or the B-phase coil 30B is switched. That is, the two-phase rotating electrical machine control device 40 controls the on and off of the switching elements 211 to 216 so as to form a closed circuit in which the current flowing through the armature coil 39, the direction of which is switched, flows back to the armature coil 39 at the time point when the direction of the current flowing through the a-phase coil 30a or the B-phase coil 30B is switched. This makes it possible to prevent the self-induction of the armature coil 39 caused by switching the direction of the current from being easily affected. That is, the influence of the self-induction means that a counter electromotive force due to the self-induction of the armature coil 39 is generated, and the counter electromotive force prevents an exciting current from flowing through the armature coil 39. The armature coil 39 cannot be magnetized due to the influence of its self-induction, and an attractive force or a repulsive force cannot be generated between the rotor magnet 33 and the teeth 34. Therefore, a moment for rotating the rotor 31 cannot be generated. The two-phase rotating electrical machine control device 40 forms a closed circuit that flows back to the armature coil 39 that switches the direction of the current at the time point when the direction of the current flowing through the armature coil 39 is switched, thereby making it possible to reduce the influence of self-induction and ensure a path through which an exciting current flows. Therefore, the two-phase rotating electrical machine control device 40 can prevent the armature coil 39 from being magnetized and can rotate the rotor 31 at the time point when the direction of the current flowing through the armature coil 39 is switched.

The energization pattern of the two-phase rotating electrical machine control device 40 according to embodiment 1 includes four energization patterns (energization pattern #1, energization pattern #3, energization pattern #5, and energization pattern #7) in which the a-phase coil 30a and the B-phase coil 30B are alternately reversely excited, and an energization pattern (energization pattern #2, energization pattern #4, energization pattern #6, and energization pattern #8) in which a closed circuit is formed before reverse excitation in which a current flowing through the armature coil 39 to be reversely excited flows back to the armature coil 39. For example, when the direction of the current flowing through the a-phase coil 30a is switched, that is, when the a-phase coil 30a is reversely excited, the two-phase rotating electrical machine control device 40 controls the switching elements 211 to 216 to be turned on and off so as to form a closed circuit in which the current flowing through the a-phase coil 30a flows back to the a-phase coil 30 a. After a fixed time after the closed circuit is formed, the two-phase rotating electrical machine control device 40 opens the closed circuit and reversely excites the a-phase coil 30 a.

For example, the two-phase rotating electrical machine control device 40 switches the energization mode based on the rotation angle of the rotor 31. The method of detecting the rotation angle of the rotor 31 is not particularly limited, and for example, the rotation angle of the rotor 31 is detected using a magnetic encoder (rotation encoder) provided with a hole IC (hole IC). In this case, the 1 st hole IC and the 2 nd hole IC are disposed adjacent to positions facing the rotor magnet 33. The 1 st hole IC and the 2 nd hole IC are arranged with a predetermined phase difference (for example, a phase difference of 90 °). Therefore, when the rotor 31 is rotated and the rotor magnet 33 passes through the front surfaces of the 1 st hole IC and the 2 nd hole IC, the detected change in magnetic flux density is used as an electric signal to generate two-phase (a-phase and B-phase) pulse signals having different phases from each other, and the two-phase pulse signals are output to the two-phase rotating electrical machine control device 40. Thus, the two-phase rotating electrical machine control device 40 detects the rotation angle of the rotor 31 based on the pulse signals supplied from the 1 st and 2 nd hole ICs. In embodiment 1, the pulse signal supplied from the 1 st well IC is H1, and the pulse signal supplied from the 2 nd well IC is H2.

The two-phase rotating electrical machine control device 40 may be implemented by hardware, may be implemented by software, or may be implemented by a combination of hardware and software. Further, by executing the program, the computer can function as a part of the two-phase rotating electrical machine control device 40. The program may be stored in a computer-readable medium or a storage device connected to a network.

The energization mode of the two-phase rotating electric machine control device 40 according to embodiment 1 will be described below.

Fig. 3A to 3H are diagrams illustrating an energization pattern #1 to an energization pattern #8 of the two-phase rotating electrical machine control device 40 according to embodiment 1. Fig. 3A to 3H show the flows of currents flowing through the a-phase coil 30a and the B-phase coil 30B in the energization patterns #1 to #8, respectively. The switching elements 211 to 216 indicated by broken lines represent off states, and the switching elements 211 to 216 indicated by solid lines represent on states. The arrows indicate the directions of current flow in the a-phase coil 30a and the B-phase coil 30B. Energization mode #1 to energization mode #8 are modes in which the two-phase rotating electric machine 30 can be driven. Further, two-phase rotary electric machine control device 40 repeatedly switches the energization mode in the order of energization mode #1, energization mode #2, energization mode #3, energization mode #4, energization mode #5, energization mode #6, energization mode #7, and energization mode #8, thereby rotationally driving two-phase rotary electric machine 30. When the two-phase rotating electrical machine 30 is started, the two-phase rotating electrical machine control device 40 may control the on/off of the switching elements 211 to 216 using any one of the conduction patterns of the conduction pattern #1 to the conduction pattern # 8. That is, the two-phase rotating electrical machine control device 40 according to embodiment 1 is characterized by the order of the energization modes to be switched, and the energization mode at the time of starting the two-phase rotating electrical machine 30 is not particularly limited.

(energization mode #1)

Fig. 3A is a diagram showing an energization pattern #1 of the two-phase rotating electric machine control device 40 in embodiment 1.

In the energization mode #1, the switching element 211, the switching element 213, and the switching element 215 are off, and the switching element 212, the switching element 214, and the switching element 216 are on. Thus, via the switching element 212, the current Ia flows through the a-phase coil 30a, and the current Ib flows through the B-phase coil 30B. That is, the current supplied from the power supply device 10 passes through a path passing through the switching element 212, the a-phase coil 30a, the switching element 214, and the ground, and a path passing through the switching element 212, the B-phase coil 30B, the switching element 216, and the ground (see fig. 3A). Thereby, the a-phase coil 30a and the B-phase coil 30B are excited.

(energization mode #2)

Fig. 3B is a diagram showing an energization pattern #2 of the two-phase rotating electric machine control device 40 according to embodiment 1.

In the energization mode #2, the switching element 213, the switching element 214, and the switching element 215 are off, and the switching element 211, the switching element 212, and the switching element 216 are on. Therefore, the current Ia flowing through the a-phase coil 30a flows back to the a-phase coil 30a through the switching elements 211 and 212. That is, in the energization mode #2, the two-phase rotating electric machine control device 40 turns on the switching element 211 and turns off the switching element 214 from the energization mode #1, thereby forming a closed circuit with the a-phase coil 30a, the switching element 211, and the switching element 212. At this time, the current supplied from the power supply device 10 passes through only a path passing through the switching element 212, the B-phase coil 30B, the switching element 216, and the ground (see fig. 3B). Thereby, the a-phase coil 30a is not excited, but the B-phase coil 30B is excited. That is, the two-phase rotating electrical machine control device 40 forms a closed circuit that takes the current flowing through the a-phase coil 30a as a switching target and returns the current to be switched, thereby ensuring a path for passing the excitation current through the B-phase coil 30B.

(energization mode #3)

Fig. 3C is a diagram showing an energization pattern #3 of the two-phase rotating electric machine control device 40 according to embodiment 1.

In the energization mode #3, the switching element 212, the switching element 213, the switching element 214, and the switching element 215 are off, and the switching element 211 and the switching element 216 are on. Therefore, the current Ic flows through the phase a coil 30a and the phase B coil 30B via the switching element 211. That is, the current supplied from the power supply device 10 passes through a path that passes through the switching element 211, the a-phase coil 30a, the B-phase coil 30B, the switching element 216, and the ground (see fig. 3C). Therefore, compared to the energization pattern #1, the direction of the current flowing through the B-phase coil 30B does not change, but the current flowing through the a-phase coil 30a reverses. Thus, the a-phase coil 30a is reversely excited.

As described above, instead of inverting the direction of the current flowing through the a-phase coil 30a to reverse the excitation of the a-phase coil 30a by switching the energization mode from energization mode #1 to energization mode #3, the current flowing through the a-phase coil 30a is returned by switching from energization mode #1 to energization mode #2, and then switched to energization mode # 3. Thus, when the a-phase coil 30a is reversely excited, the influence of the self-induction of the a-phase coil 30a can be reduced, and therefore a sufficient excitation current can be caused to flow through the B-phase coil 30B. Therefore, when the a-phase coil 30a is reversely excited, a torque for rotationally driving the two-phase rotating electrical machine 30 can be generated, and therefore the two-phase rotating electrical machine 30 can be efficiently driven.

(energization mode #4)

Fig. 3D is a diagram showing an energization pattern #4 of the two-phase rotating electric machine control device 40 according to embodiment 1.

In energization mode #4, switching element 212, switching element 213, and switching element 214 are off, and switching element 211, switching element 215, and switching element 216 are on. Therefore, the current Ib flowing through the B-phase coil 30B flows back to the B-phase coil 30B through the switching element 216 and the switching element 215. That is, in the energization mode #4, the two-phase rotating electric machine control device 40 turns on the switching element 215 from the energization mode #3, thereby forming a closed circuit with the B-phase coil 30B, the switching element 216, and the switching element 215. At this time, the current supplied from the power supply device 10 passes through only a path passing through the switching element 211, the a-phase coil 30a, the switching element 215, and the ground (see fig. 3D). Thereby, the B-phase coil 30B is not excited, but the a-phase coil 30a is excited. That is, the two-phase rotating electrical machine control device 40 forms a closed circuit that switches the current flowing through the B-phase coil 30B and returns the current to be switched, thereby reducing the influence of the self-induction of the B-phase coil 30B.

(energization mode #5)

Fig. 3E is a diagram showing an energization pattern #5 of the two-phase rotating electric machine control device 40 according to embodiment 1.

In the energization mode #5, the switching element 212, the switching element 214, and the switching element 216 are off, and the switching element 211, the switching element 213, and the switching element 215 are on. Thus, the current Ia flows through the a-phase coil 30a via the switching element 211, and the current Ib flows through the B-phase coil 30B via the switching element 213. That is, the current supplied from the power supply device 10 passes through a path passing through the switching element 211, the a-phase coil 30a, the switching element 215, and the ground, and a path passing through the switching element 213, the B-phase coil 30B, the switching element 215, and the ground (see fig. 3E). Therefore, compared to conduction pattern #3, the direction of the current flowing through phase a coil 30a does not change, but the current flowing through phase B coil 30B reverses. Therefore, the B-phase coil 30B is reversely excited.

As described above, instead of inverting the direction of the current flowing through the B-phase coil 30B to reverse the excitation of the B-phase coil 30B by switching the energization mode from energization mode #3 to energization mode #5, the current flowing through the B-phase coil 30B is returned by switching from energization mode #3 to energization mode #4, and then switched to energization mode # 5. Thus, when the B-phase coil 30B is reversely excited, the influence of the self-induction of the B-phase coil 30B can be reduced, and therefore, a sufficient excitation current can be caused to flow through the a-phase coil 30 a. Therefore, when the B-phase coil 30B is reversely excited, a torque for rotationally driving the two-phase rotating electrical machine 30 can be generated, and therefore the two-phase rotating electrical machine 30 can be efficiently driven.

(energization mode #6)

Fig. 3F is a diagram showing an energization pattern #6 of the two-phase rotating electric machine control device 40 in embodiment 1.

In energization mode #6, switching element 211, switching element 212, and switching element 216 are off, and switching element 213, switching element 214, and switching element 215 are on. Therefore, the current Ia flowing through the a-phase coil 30a flows back to the a-phase coil 30a through the switching elements 215 and 214. That is, in the energization mode #6, the two-phase rotating electric machine control device 40 turns off the switching element 211 and turns on the switching element 214 from the energization mode #5, thereby forming a closed circuit with the a-phase coil 30a, the switching element 214, and the switching element 215. At this time, the current supplied from the power supply device 10 passes through only a path passing through the switching element 213, the B-phase coil 30B, the switching element 215, and the ground (see fig. 3F). Thereby, the a-phase coil 30a is not excited, but the B-phase coil 30B is excited. The two-phase rotating electrical machine control device 40 forms a closed circuit that takes the current flowing through the a-phase coil 30a as a switching target and returns the current to be switched, thereby ensuring a path for passing an excitation current through the B-phase coil 30B.

(energization mode #7)

Fig. 3G shows an energization pattern #7 of the two-phase rotating electric machine control device 40 according to embodiment 1.

In the energization mode #7, the switching element 211, the switching element 212, the switching element 215, and the switching element 216 are off, and the switching element 213 and the switching element 214 are on. Therefore, the current Ic flows through the phase B coil 30B and the phase a coil 30a via the switching element 213. That is, the current supplied from the power supply device 10 passes through a path that passes through the switching element 213, the B-phase coil 30B, the a-phase coil 30a, the switching element 214, and the ground (see fig. 3G). Therefore, compared to energization pattern #5, the direction of the current flowing through the B-phase coil 30B does not change, but the current flowing through the a-phase coil 30a reverses. Thus, the a-phase coil 30a is reversely excited.

As described above, instead of inverting the direction of the current flowing through the a-phase coil 30a to reverse the excitation of the a-phase coil 30a by switching the energization mode from energization mode #5 to energization mode #7, the current flowing through the a-phase coil 30a is returned by switching from energization mode #5 to energization mode #6, and then switched to energization mode # 7. Thus, when the a-phase coil 30a is reversely excited, the influence of the self-induction of the a-phase coil 30a can be reduced, and therefore a sufficient excitation current can be caused to flow through the B-phase coil 30B. Therefore, when the a-phase coil 30a is reversely excited, a torque for rotationally driving the two-phase rotating electrical machine 30 can be generated, and therefore the two-phase rotating electrical machine 30 can be efficiently driven.

(energization mode #8)

Fig. 3H is a diagram showing an energization pattern #8 of the two-phase rotating electric machine control device 40 according to embodiment 1.

In energization mode #8, switching element 211, switching element 215, and switching element 216 are off, and switching element 212, switching element 213, and switching element 214 are on. Therefore, the current Ib flowing through the B-phase coil 30B flows back to the B-phase coil 30B through the switching element 212 and the switching element 213. That is, in the energization mode #8, the two-phase rotating electric machine control device 40 turns on the switching element 212 from the energization mode #7, thereby forming a closed circuit with the B-phase coil 30B, the switching element 212, and the switching element 213. At this time, the current supplied from the power supply device 10 passes through only a path passing through the switching element 212, the a-phase coil 30a, the switching element 214, and the ground (see fig. 3H). Thereby, the B-phase coil 30B is not excited, and only the a-phase coil 30a is excited. Therefore, when the energization mode is switched from energization mode #8 to energization mode #1, the direction of the current flowing through the a-phase coil 30a does not change, but the current flowing through the B-phase coil 30B reverses. Therefore, the B-phase coil 30B is reversely excited. The two-phase rotating electrical machine control device 40 forms a closed circuit that switches the current flowing through the B-phase coil 30B and returns the current to be switched, thereby reducing the influence of the self-induction of the B-phase coil 30B.

As described above, the direction of the current flowing through the B-phase coil 30B is not reversed to reversely excite the B-phase coil 30B by switching the energization mode from the energization mode #7 to the energization mode #1, but the current flowing through the B-phase coil 30B is returned by switching from the energization mode #7 to the energization mode #8, and then, the energization mode is switched to the energization mode # 1. Thus, when the B-phase coil 30B is reversely excited, the influence of the self-induction of the B-phase coil 30B can be reduced, and therefore, a sufficient excitation current can be caused to flow through the a-phase coil 30 a. Therefore, when the B-phase coil 30B is reversely excited, a torque for rotationally driving the two-phase rotating electrical machine 30 can be generated, and therefore the two-phase rotating electrical machine 30 can be efficiently driven.

Fig. 4 is a diagram showing an example of the switching time points of the respective energization patterns #1 to #8 of the two-phase rotating electrical machine control device 40 in embodiment 1. In fig. 4, the case where the signals corresponding to the respective switching elements 211 to 216 are at the H level indicates that the respective switching elements 211 to 216 are in the on state, and the case where the signals are at the L level indicates that the respective switching elements 211 to 216 are in the off state. Fig. 4 shows an example of the switching time points of the respective conduction patterns #1 to #8 when the advance angle is 0 °.

As shown in fig. 4, the two-phase rotating electrical machine control device 40 detects the rotation angle of the rotor 31 based on the pulse signal H1 and the pulse signal H2. Then, the two-phase rotating electrical machine control device 40 sequentially switches the energization pattern #1 to the energization pattern #8 in units of a rotation angle of 45 ° of the rotor 31.

Further, the two-phase rotating electrical machine control device 40 in the present embodiment is configured to return the current flowing through the coil in which the direction of the current is switched when switching the direction of the current flowing through either one of the two coils, i.e., the a-phase coil 30a and the B-phase coil 30B, but is not limited to this. For example, the two-phase rotating electrical machine control device 40 returns the current flowing through the coil in which the direction of the current is switched at least one of a plurality of time points in which the direction of the current flowing through either of the two coils, the a-phase coil 30a and the B-phase coil 30B, is switched. For example, the plurality of time points indicate four switching time points of the energization pattern, that is, a time point at which energization pattern #1 shown in fig. 3A is directly switched to energization pattern #3 shown in fig. 3C, a time point at which energization pattern #3 shown in fig. 3C is directly switched to energization pattern #5 shown in fig. 3E, a time point at which energization pattern #5 shown in fig. 3E is directly switched to energization pattern #7 shown in fig. 3G, and a time point at which energization pattern #7 shown in fig. 3G is directly switched to energization pattern #1 shown in fig. 3A. That is, two-phase rotating electrical machine control device 40 may include at least one of conduction pattern #2, conduction pattern #4, conduction pattern #6, and conduction pattern #8 as conduction patterns forming the closed circuit.

As described above, the two-phase rotating electrical machine control device 40 according to embodiment 1 can perform switching control to switch the direction of the excitation current to a predetermined direction before switching the direction of the excitation current flowing through either one of the a-phase coil 30a and the B-phase coil 30B and after returning the current flowing through the target coil whose direction of the excitation current is switched. That is, the two-phase rotating electrical machine control device 40 in embodiment 1 can return the current flowing through the target coil whose direction of the excitation current is switched before the switching control of switching the direction of the excitation current flowing through either one of the two coils, i.e., the a-phase coil 30a and the B-phase coil 30B, is executed.

This prevents the generation of a through current and the generation of no torque in the rotating electric machine when the direction of the current flowing through (the coil of) the a-phase or the B-phase is switched.

A modified example of the two-phase rotating electrical machine control device 40 according to embodiment 1 will be described below. Fig. 5 is a diagram showing an example of the timing of switching the energization mode by the two-phase rotating electric machine control device 40 according to the modification of embodiment 1.

The two-phase rotating electrical machine control device 40 according to the present modification includes the conduction pattern in which the conduction pattern #4 and the conduction pattern #8 are omitted, among the conduction patterns #1 to #8 in embodiment 1.

That is, in the two-phase rotating electrical machine control device 40 according to the present modification, the two-phase rotating electrical machine 30 is rotationally driven by repeatedly switching the energization mode in the order of energization mode #1, energization mode #2, energization mode #3, energization mode #5, energization mode #6, and energization mode # 7. Thus, compared to embodiment 1, the two-phase rotating electric machine control device 40 of the present modification has fewer current-carrying modes, and therefore control of the switching elements 211 to 216 can be simplified. For example, the two-phase rotating electrical machine control device 40 controls the on state and the off state of the switching elements 211 to 216 based on the rising time point or the falling time point of the pulse signal H1 and the pulse signal H2 (the rising time point or the falling time point of either the pulse signal H1 or the pulse signal H2) supplied from the 1 st-hole IC and the 2 nd-hole IC, respectively. At this time, as shown in fig. 5, the two-phase rotary electric machine control device 40 can control the on state or the off state of the switching elements 211 to 216 at the time points of the rising or falling of the pulse signal H1 and the pulse signal H2 in the energization mode #1, the energization mode #3, the energization mode #5, and the energization mode #7, but cannot control the on state or the off state of the switching elements 211 to 216 at the time points of the rising or falling of the pulse signal H1 and the pulse signal H2 in the energization mode #2, the energization mode #4, the energization mode #6, and the energization mode # 8. Therefore, when switching from energization mode #1 to energization mode #2, two-phase rotating electrical machine control apparatus 40 switches to energization mode #2 after counting a fixed time from the time point of the rise of pulse signal H1. That is, when energization pattern #2, energization pattern #4, energization pattern #6, and energization pattern #8 are executed, it is necessary for two-phase rotating electrical machine control device 40 to perform a process of counting time (hereinafter, referred to as "timer process"). Therefore, by omitting energization pattern #4 and energization pattern #8, the timer processing of the two-phase rotating electrical machine control device 40 can be reduced as compared with embodiment 1.

The reason why energization patterns #4 and #8 can be omitted will be described below.

When the energization mode is switched from energization mode #3 to energization mode #5 without passing through energization mode #4, a closed circuit for circulating the current flowing through the B-phase coil 30B is not formed, and therefore, the influence of the self-induction of the B-phase coil 30B cannot be reduced. Similarly, when the energization mode is switched from energization mode #7 to energization mode #1, a closed circuit for circulating the current flowing through the B-phase coil 30B is not formed, and therefore the influence of the self-induction of the B-phase coil 30B cannot be reduced. That is, there is a period in which torque for rotationally driving the two-phase rotating electrical machine 30 is not generated.

However, in the energization mode #3, since the switching elements 212 to 215 are in the off state, the current supplied from the power supply device 10 passes through a path in which the a-phase coil 30a and the B-phase coil 30B are connected in series. In the energization mode #7, since the switching element 211, the switching element 212, the switching element 215, and the switching element 216 are in the off state, the current (excitation current) supplied from the power supply device 10 passes through a path in which the a-phase coil 30a and the B-phase coil 30B are connected in series, similarly to the energization mode # 3. The resistance of the path connecting the phase a coil 30a and the phase B coil 30B in series is the resistance value R of the phase a coil 30a_aResistance value R of phase B coil 30B_bAdded resistance value (R)_a+R_b). In the embodiments described below, the resistance value R is used for convenience sake_aAnd resistance value R_bIs the same resistance value R_cThe case of (c) will be explained. That is, it is assumed that the a-phase coil 30a and the B-phase coil 30B have the same inductance. Therefore, the resistance of the path connecting the phase a coil 30a and the phase B coil 30B in series is 2R_c. On the other hand, in the energization mode #1 or the energization mode #5, a path through which the current supplied from the power supply device 10 passes is a path through any one of the armature coils 39 of the a-phase coil 30a and the B-phase coil 30B. That is, the path through which the current supplied by the power supply device 10 passes is not a path through which the a-phase coil 30a and the B-phase coil 30B are connected in series, but a path through only the a-phase coil 30a or the B-phase coil 30B. That is, the resistance of the path passing only through the a-phase coil 30a or the B-phase coil 30B is R_c. Therefore, assuming that the voltage of the power supply device 10 is 12V, a voltage of 6V is applied to each of the a-phase coil 30a and the B-phase coil 30B in the path in which the a-phase coil 30a and the B-phase coil 30B are connected in series. On the other hand, a voltage of 12V is applied to the a-phase coil 30a or the B-phase coil 30B only in the path passing through the a-phase coil 30a or the B-phase coil 30B. That is, the current flowing through the a-phase coil 30a or the B-phase coil 30B is smaller in the conduction pattern #3 or the conduction pattern #7 constituting the path connecting the a-phase coil 30a and the B-phase coil 30B in series than in the conduction pattern #1 or the conduction pattern #5 including the path passing through only the a-phase coil 30a or the B-phase coil 30B.

In general, the energy accumulated in the exciting coil is proportional to the product of the square of the current flowing through the exciting coil and the inductance. Thus, as the current flowing through the exciting coil becomes larger, the counter electromotive force becomes higher. Accordingly, the energy accumulated in the a-phase coil 30a and the B-phase coil 30B in the conduction patterns #1 and #5 is larger than in the conduction patterns #3 and # 7. That is, the counter electromotive force generated by reverse-exciting the B-phase coil 30B by the self-energization pattern #3 and the energization pattern #7 (energization pattern #3 → energization pattern #5, energization pattern #7 → energization pattern #1) is smaller than the counter electromotive force generated by reverse-exciting the a-phase coil 30a by the self-energization pattern #1 and the energization pattern #5 (energization pattern #1 → energization pattern #3, energization pattern #5 → energization pattern # 7). Therefore, regarding a period in which the torque of the two-phase electric rotating machine 30 is not generated by the reverse excitation (hereinafter, referred to as a "torque non-generation period"), the energization pattern #1 → the energization pattern #3, the energization pattern #5 → the energization pattern #7 are shorter than the energization pattern #3 → the energization pattern #5, the energization pattern #7 → the energization pattern # 1. Thus, if the torque non-generation period of allowable energization pattern #3 → energization pattern #5, energization pattern #7 → energization pattern #1 is long, energization pattern #2 and energization pattern #6 forming closed circuits are used and then reverse excitation is performed in the period of torque non-generation (energization pattern #1 → energization pattern #3, energization pattern #5 → energization pattern #7), and energization pattern #4 and energization pattern #8 can be omitted.

Therefore, according to the modification, the same effects as those of embodiment 1 can be obtained, and the control of the switching elements 211 to 216 can be simplified.

(embodiment 2)

Hereinafter, the two-phase rotating electrical machine control device 40A according to embodiment 2 will be described.

Fig. 6 is a diagram showing an example of a schematic configuration of a two-phase rotating electric machine control system 1A including a two-phase rotating electric machine control device 40A according to embodiment 2. As shown in fig. 6, the two-phase rotating electrical machine control system 1A includes a power supply device 10, an inverter circuit 20, a two-phase rotating electrical machine 30, and a two-phase rotating electrical machine control device 40A. The two-phase rotating electrical machine control device 40A according to embodiment 2 forms a closed circuit that returns the current flowing through the armature coil 39, the direction of which is switched, to the armature coil 39 by a different path than that of embodiment 1.

The two-phase rotating electrical machine control device 40A switches the energization mode for energizing the a-phase coil 30A and the B-phase coil 30B by controlling the on and off of the switching elements 211 to 216. That is, the two-phase rotating electric machine control device 40A controls the directions of the currents flowing through the a-phase coil 30A and the B-phase coil 30B by controlling the on and off of the switching elements 211 to 216. In other words, the two-phase rotating electrical machine control device 40A controls the on and off of the switching elements 211 to 216 so as to switch the direction of the current flowing through the a-phase coil 30A or the B-phase coil 30B, using a plurality of preset energization modes in order. Thus, the two-phase rotating electrical machine control device 40A switches the direction of the magnetic flux of the a-phase coil 30A or the B-phase coil 30B, thereby generating an attractive force or a repulsive force between the rotor magnet 33 and the teeth 34, and rotating the rotor 31.

The energization pattern of the two-phase rotating electrical machine control device 40A according to embodiment 2 includes four energization patterns (energization pattern #1, energization pattern #3, energization pattern #5, and energization pattern #7) in which the a-phase coil 30A and the B-phase coil 30B are alternately reversely excited, and an energization pattern (energization pattern #2 ', energization pattern # 4', energization pattern #6 ', energization pattern # 8') in which a closed circuit is formed before reverse excitation in which a current flowing through the armature coil 39 to be reversely excited flows back to the armature coil 39. For example, when the direction of the current flowing through the a-phase coil 30A is switched, that is, when the a-phase coil 30A is reversely excited, the two-phase rotating electrical machine control device 40A controls the switching elements 211 to 216 to be turned on and off so as to form a closed circuit in which the current flowing through the a-phase coil 30A flows back to the a-phase coil 30A. After a fixed time has elapsed after the closed circuit is formed, the two-phase rotating electric machine control device 40A opens the closed circuit and reversely excites the a-phase coil 30A. The two-phase rotating electrical machine control device 40A may switch the energization mode based on the pulse signal H1 supplied from the 1 st and 2 nd well ICs, and the rising time point and the falling time point of the pulse signal H2 (the rising time point or the falling time point of one of the pulse signal H1 and the pulse signal H2).

The two-phase rotating electrical machine control device 40A may be implemented by hardware, may be implemented by software, or may be implemented by a combination of hardware and software. Further, by executing the program, the computer can function as a part of the two-phase rotating electrical machine control device 40A. The program may be stored in a computer-readable medium or a storage device connected to a network.

The energization mode of the two-phase rotating electric machine control device 40A according to embodiment 2 will be described below.

Fig. 7A to 7H are diagrams illustrating energization patterns #1, #2 ', energization patterns #3, #4 ', energization patterns #5, energization patterns #6 ', energization patterns #7, and #8 ' (hereinafter, "energization patterns #1 to #8 '") of a two-phase rotating electrical machine control device 40A according to embodiment 2, respectively. Fig. 7A to 7H show the flows of currents flowing through the a-phase coil 30a and the B-phase coil 30B in the energization patterns #1 to # 8', respectively. The switching elements 211 to 216 indicated by broken lines represent off states, and the switching elements 211 to 216 indicated by solid lines represent on states. The arrows indicate the directions of current flow in the a-phase coil 30a and the B-phase coil 30B. Energization patterns #1 to # 8' are patterns that can drive the two-phase rotating electric machine 30. Further, two-phase rotary electric machine control device 40A repeatedly switches the energization mode in the order of energization mode #1, energization mode #2 ', energization mode #3, energization mode # 4', energization mode #5, energization mode #6 ', energization mode #7, and energization mode # 8', thereby rotationally driving two-phase rotary electric machine 30. When the two-phase rotating electrical machine 30 is started, the two-phase rotating electrical machine control device 40A may control the on/off of the switching elements 211 to 216 using any one of the conduction patterns of the conduction pattern #1 to the conduction pattern # 8'. That is, the two-phase rotating electrical machine control device 40A according to embodiment 2 is characterized by the order of the energization modes to be switched, and the energization mode at the time of starting the two-phase rotating electrical machine 30 is not particularly limited. Since fig. 7A is the same as fig. 3A, the description thereof is omitted. Fig. 7C is the same as fig. 3C, and therefore, the description thereof is omitted. Fig. 7E is the same as fig. 3E, and therefore, the description thereof is omitted. Fig. 7G is the same as fig. 3G, and therefore, the description thereof is omitted.

(energization pattern # 2')

Fig. 7B is a diagram showing an energization pattern # 2' of the two-phase rotating electric machine control device 40A according to embodiment 2.

In the energization pattern # 2', the switching element 211, the switching element 212, and the switching element 213 are off, and the switching element 214, the switching element 215, and the switching element 216 are on. Therefore, the current Ia flowing through the a-phase coil 30a flows back to the a-phase coil 30a through the switching element 214 and the switching element 215. Further, current Ib flowing through B-phase coil 30B flows back to B-phase coil 30B through switching element 216 and switching element 215. That is, in the energization mode # 2', the two-phase rotating electric machine control device 40A sets the switching element 215 to the on state and the switching element 212 to the off state from the energization mode #1, thereby forming a closed circuit of the a-phase coil 30A, the switching element 214, and the switching element 215 and a closed circuit of the B-phase coil 30B, the switching element 216, and the switching element 215 (see fig. 7B).

As described above, instead of inverting the direction of the current flowing through the a-phase coil 30a to reverse the excitation of the a-phase coil 30a by switching the energization mode from energization mode #1 to energization mode #3, the current flowing through the a-phase coil 30a is returned by switching from energization mode #1 to energization mode # 2', and then switched to energization mode # 3. This reduces the influence of the self-induction of the a-phase coil 30a when the a-phase coil 30a is reversely excited.

(energization pattern # 4')

Fig. 7D is a diagram showing an energization pattern # 4' of the two-phase rotating electric machine control device 40A according to embodiment 2.

In the energization pattern # 4', the switching elements 212, 214, and 216 are off, and the switching elements 211, 213, and 215 are on. Therefore, the current Ib flowing through the B-phase coil 30B flows back to the B-phase coil 30B through the switching element 213, the switching element 211, and the a-phase coil 30 a. That is, in energization mode # 4', the two-phase rotating electric machine control device 40A forms a closed circuit with the B-phase coil 30B, the switching element 213, the switching element 211, and the a-phase coil 30A by turning the switching element 216 off and turning the switching element 213 and the switching element 215 on from energization mode # 3. At this time, the current supplied from the power supply device 10 passes through only a path passing through the switching element 211, the a-phase coil 30a, the switching element 215, and the ground (see fig. 7D). Thereby, the B-phase coil 30B is not excited, but the a-phase coil 30a is excited. The two-phase rotating electrical machine control device 40A forms a closed circuit that switches the current flowing through the B-phase coil 30B and returns the current to be switched, thereby reducing the influence of the self-induction of the B-phase coil 30B.

As described above, the direction of the current flowing through the B-phase coil 30B is reversed to reverse the excitation of the B-phase coil 30B by switching the energization mode from energization mode #3 to energization mode #5, but the current flowing through the B-phase coil 30B is returned by switching from energization mode #3 to energization mode # 4', and then switched to energization mode # 5. Accordingly, when the B-phase coil 30B is reversely excited, the influence of the self-induction of the B-phase coil 30B can be reduced, and thus the two-phase rotating electric machine 30 can be efficiently driven.

(energization pattern # 6')

Fig. 7F is a diagram showing an energization pattern # 6' of the two-phase rotating electric machine control device 40A according to embodiment 2.

In the energization mode # 6', the switching elements 214, 215, and 216 are off, and the switching elements 211, 212, and 213 are on. Therefore, the current Ia flowing through the a-phase coil 30a flows back to the a-phase coil 30a through the switching elements 212 and 211. Further, the current Ib flowing through the B-phase coil 30B flows back to the B-phase coil 30B through the switching element 212 and the switching element 213. That is, in the energization mode # 6', the two-phase rotating electric machine control device 40A sets the switching element 215 to the off state and sets the switching element 212 to the on state from the energization mode #5, thereby forming a closed circuit of the a-phase coil 30A, the switching element 212, and the switching element 211 and a closed circuit of the B-phase coil 30B, the switching element 212, and the switching element 213 (see fig. 7F).

As described above, instead of inverting the direction of the current flowing through the a-phase coil 30a to reverse the excitation of the a-phase coil 30a by switching the energization mode from energization mode #5 to energization mode #7, the current flowing through the a-phase coil 30a is returned by switching from energization mode #5 to energization mode # 6', and then switched to energization mode # 7. This reduces the influence of the self-induction of the a-phase coil 30a when the a-phase coil 30a is reversely excited.

(energization pattern # 8')

Fig. 7H is a diagram showing an energization pattern # 8' of the two-phase rotating electric machine control device 40A according to embodiment 2.

In the energization mode # 8', the switching element 211, the switching element 213, and the switching element 215 are off, and the switching element 212, the switching element 214, and the switching element 216 are on. Therefore, the current Ib flowing through the B-phase coil 30B flows back to the B-phase coil 30B through the a-phase coil 30a, the switching element 214, and the switching element 216. That is, in energization mode # 8', from energization mode #7, two-phase rotating electric machine control device 40A turns off switching element 213 and turns on switching element 212 and switching element 216, thereby forming a closed circuit with B-phase coil 30B, a-phase coil 30A, switching element 214, and switching element 216. At this time, the current supplied from the power supply device 10 passes through only a path passing through the switching element 212, the a-phase coil 30a, the switching element 214, and the ground (see fig. 7H). Thereby, the B-phase coil 30B is not excited, and only the a-phase coil 30a is excited. Therefore, when the energization mode is switched from the energization mode # 8' to the energization mode #1, the direction of the current flowing through the a-phase coil 30a is not changed, but the current flowing through the B-phase coil 30B is reversed. Therefore, the B-phase coil 30B is reversely excited. The two-phase rotating electrical machine control device 40A forms a closed circuit that switches the current flowing through the B-phase coil 30B and returns the current to be switched, thereby reducing the influence of the self-induction of the B-phase coil 30B.

As described above, the current flowing through the B-phase coil 30B is returned by switching the energization mode from the energization mode #7 to the energization mode # 8', and then switched to the energization mode #1, instead of inverting the direction of the current flowing through the B-phase coil 30B to reversely excite the B-phase coil 30B by switching the energization mode from the energization mode #7 to the energization mode # 1. Accordingly, when the B-phase coil 30B is reversely excited, the influence of the self-induction of the B-phase coil 30B can be reduced, and thus the two-phase rotating electric machine 30 can be efficiently driven.

Further, the two-phase rotating electrical machine control device 40A in the present embodiment is configured to return the current flowing through the coil in which the direction of the current is switched when switching the direction of the current flowing through either of the two coils, the a-phase coil 30A and the B-phase coil 30B, but is not limited to this. For example, the two-phase rotating electrical machine control device 40A returns the current flowing through the coil in which the direction of the current is switched at least one of a plurality of time points in which the direction of the current flowing through either one of the two coils, the a-phase coil 30A and the B-phase coil 30B, is switched. For example, the plurality of time points indicate four switching time points of the energization pattern, that is, a time point at which energization pattern #1 shown in fig. 7A is directly switched to energization pattern #3 shown in fig. 7C, a time point at which energization pattern #3 shown in fig. 7C is directly switched to energization pattern #5 shown in fig. 7E, a time point at which energization pattern #5 shown in fig. 7E is directly switched to energization pattern #7 shown in fig. 7G, and a time point at which energization pattern #7 shown in fig. 7G is directly switched to energization pattern #1 shown in fig. 7A. That is, the two-phase rotating electrical machine control device 40A may include at least one of the energization pattern #2 ', the energization pattern # 4', the energization pattern #6 ', and the energization pattern # 8', which are energization patterns forming the closed circuit.

As described above, the two-phase rotating electrical machine control device 40A according to embodiment 2 can execute switching control for switching to a predetermined direction of the excitation current before switching the direction of the excitation current flowing through any of the two coils, i.e., the a-phase coil 30A and the B-phase coil 30B, and after returning the current flowing through the target coil whose direction of the excitation current is switched. That is, the two-phase rotating electrical machine control device 40A in embodiment 2 can return the current flowing through the target coil whose direction of the excitation current is switched before the switching control of switching the direction of the excitation current flowing through either one of the two coils, the a-phase coil 30A and the B-phase coil 30B, is executed.

Thus, when the direction of the current flowing through (the coil of) the a-phase or the B-phase is switched, the occurrence of the through current can be prevented, and the influence of the self-induction can be reduced.

In the above embodiment, the two-phase rotating electrical machine control device 40 and the two-phase rotating electrical machine control device 40A control the two-phase rotating electrical machine 30 in the two-phase three-wire system. Even in the two-phase four-wire type, the two-phase rotating electric machine 30 can be controlled. However, when the two-phase four-wire type inverter is used, the number of switching elements used in the inverter circuit needs to be increased, which may result in high cost.

In addition, the two-phase rotating electrical machine 30 can reduce a number of sensors for detecting the rotation angle, as compared with a three-phase rotating electrical machine (e.g., a three-phase brushless dc motor). That is, by using the two-phase rotating electrical machine 30 as the rotating electrical machine, it is possible to provide a control system for the rotating electrical machine which is less expensive than the case of using the three-phase rotating electrical machine.

In the above embodiment, as shown in fig. 8, the a-phase coil 30a and the B-phase coil 30B may be configured as a coil group in which a plurality of coils are connected in parallel and in series, respectively.

The two-phase rotating electrical machine control device 40 and the two-phase rotating electrical machine control device 40A in the above-described embodiment may be implemented by a computer. In this case, this can also be achieved as follows: a program for realizing the above functions is recorded in a computer-readable recording medium, and the program recorded in the recording medium is read into a computer system and executed. The term "computer System" as used herein includes hardware such as an Operating System (OS) and peripheral devices. The "computer-readable recording medium" refers to a removable medium such as a flexible disk, a magneto-optical disk, a Read Only Memory (ROM), or a Compact Disc-Read Only Memory (CD-ROM), or a storage device such as a hard disk built in a computer system. The "computer-readable recording medium" may include those that dynamically hold a program for a short period of time, such as a communication line when the program is transmitted via a network such as the internet or a communication line such as a telephone line, and those that hold the program for a fixed period of time, such as a nonvolatile memory in a computer system serving as a server or a client in the above case. The program may be a part for realizing the functions, may be a combination with a program already recorded in a computer system for realizing the functions, or may be a combination of a part and a program for realizing the functions by using a Programmable logic device such as a Field Programmable Gate Array (FPGA).

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to the embodiments, and designs and the like without departing from the scope of the present invention are also included.

It should be noted that: the order of execution of the respective processes such as the operations, sequence, steps, and stages in the devices, systems, programs, and methods shown in the claims, the description, and the drawings is not particularly limited to "first", "prior", and the like, and the following processes may be implemented in any order as long as the output of the preceding process is not used. The operational flows in the claims, the specification, and the drawings are not necessarily performed in the order described, even if the description is made using "first", "second", and the like for convenience.

Claims (1)

1. A two-phase rotary electric machine control system, comprising:

a rotating electrical machine including a rotor having an inner circumferential surface on which a plurality of magnets are arranged, and a stator arranged inside the rotor and around which a first coil and a second coil are wound;

an inverter circuit including a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, and a sixth switching element; and

a rotating electric machine control device that switches the first switching element, the second switching element, the third switching element, the fourth switching element, the fifth switching element, and the sixth switching element between on and off to control the current flowing through the first coil and the second coil, thereby rotating the rotor,

the first switching element is connected in series with the fourth switching element,

the second switching element is connected in series with the fifth switching element,

the third switching element is connected in series with the sixth switching element,

one end of the first coil is connected between the first switching element and the fourth switching element,

one end of the second coil is connected between the third switching element and the sixth switching element,

the other end of the first coil and the other end of the second coil are connected between the second switching element and the fifth switching element,

the rotating electric machine control device switches energization control in the order of first energization control, second energization control, third energization control, fourth energization control, fifth energization control, sixth energization control, seventh energization control and eighth energization control,

the first energization control causes an exciting current from a power supply device to flow through a path of the second switching element, the first coil, and the fourth switching element and a path of the second switching element, the second coil, and the sixth switching element,

the second energization control switches the first switching element to an on state and the fourth switching element to an off state after the first energization control, forms a closed circuit with the first coil, the first switching element, and the second switching element, causes a current flowing through the first coil to flow back through the closed circuit, and causes the excitation current to flow only through a path of the second switching element, the second coil, and the sixth switching element,

the third energization control switching the direction of the excitation current flowing through the first coil by passing the excitation current through a path of the first switching element, the first coil, the second coil, and the sixth switching element after the second energization control,

the fourth switching element switches the fifth switching element to an on state after the third switching element, forms a closed circuit with the second coil, the sixth switching element, and the fifth switching element, causes a current flowing through the second coil to flow back through the closed circuit, and causes the excitation current to flow only through a path of the first switching element, the first coil, and the fifth switching element,

the fifth power-on control, after the fourth power-on control, flowing the excitation current through a path of the first switching element, the first coil, and the fifth switching element and a path of the third switching element, the second coil, and the fifth switching element, thereby switching a direction of the excitation current flowing through the second coil,

the sixth power-on control switches the first switching element to an off state and the fourth switching element to an on state after the fifth power-on control, and forms a closed circuit with the first coil, the fourth switching element, and the fifth switching element, and causes a current flowing through the first coil to flow back through the closed circuit, and causes the excitation current to flow only through a path of the third switching element, the second coil, and the fifth switching element,

the seventh energization control, after the sixth energization control, flowing the excitation current through a path of the third switching element, the second coil, the first coil, and the fourth switching element, thereby switching a direction of the excitation current flowing through the first coil,

the eighth power control switches the second switching element to an on state after the seventh power control, forms a closed circuit with the second coil, the second switching element, and the third switching element, causes a current flowing through the second coil to flow back through the closed circuit, and causes the exciting current to flow only through a path of the second switching element, the first coil, and the fourth switching element,

in this way, the rotating electrical machine control system switches the direction of the excitation current to a predetermined direction after the current flowing through the target coil whose direction is switched before switching the direction of the excitation current flowing through either one of the first coil and the second coil is returned.

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