JP2003189675A - Starting method of brushless dynamo-electric machine for driving internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a starting method of a brushless dynamo-electric machine that can obtain a large starting torque even when a rotor position detecting element is not used. <P>SOLUTION: When starting, current is applied gradually, as initial excitation (steps S1, S2), only through any two of the stator windings for the first, second, and third phases while monitoring to ensure that the applied current does not exceed a prescribed value, thereby fixing the position of the magnet rotor. Next, as forced commutation (step S3), current is applied forcibly through the winding of each phase sequentially while gradually increasing the quantity of the current applied, thereby forcibly rotating the magnet rotor, when the value of the applied current reaches a prescribed monitored value, current is applied continuously at approximately the monitored value. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a brushless rotary electric machine, and more particularly to a method for starting a brushless rotary electric machine suitable for generating a large torque at the time of starting.

[0002]

2. Description of the Related Art In a brushless motor as a rotating electric machine, a three-phase stator winding is energized by a rotor (hereinafter,
Each time the "rotor") rotates by an electrical angle of 120 °, the rotor is rotated and switched sequentially. A conventional brushless motor is generally provided with a position detecting element such as a hall element for detecting the rotational position of the rotor. In recent years, in order to meet the demand for miniaturization of brushless motors, brushless motors that do not use a position detection element have been proposed.

For example, in the brushless motor disclosed in Japanese Examined Patent Publication No. 5-24760, in view of the fact that energization is performed between two different phases of a three-phase stator winding, it is induced in a non-energized phase. The voltage is detected, and the position of the rotor is calculated based on the detected voltage. In this brushless motor, since the induced voltage that is the reference for calculating the position of the rotor cannot be obtained at the time of starting, first, forced commutation is performed to slightly rotate the rotor. The forced commutation refers to energization between any phase of the stator, for example, U-phase and V-phase (hereinafter referred to as "one-phase energization"), regardless of the position of the rotor. Then, the position of the rotor is detected based on the induced voltage at this time, and thereafter, normal energization is performed with the detected position as a reference.

[0004]

The relative positional relationship between the rotor and the stator (hereinafter, referred to as "stator") when the motor stops in a free state in which the motor is not energized is determined by the attraction force and repulsion force of the magnet. Prescribed by the relationship. For example, in the case of an outer rotor type brushless motor having a three-phase fixed winding, the stop position as the relative position of the rotor and the stator has the six forms shown in FIG. 13, that is, the stop positions p1 to p6. Note that FIG. 13 shows the relative positional relationship between the rotor and the stator when the motor is stopped in a free state, and also shows the configuration of the main parts of the brushless motor.

In FIG. 13, the rotation direction of the rotor is referred to as forward rotation Rs in the counterclockwise rotation and reverse rotation Rr in the clockwise direction. A stator 100 is arranged on the inner peripheral side of the brushless motor, and a rotor 200 is arranged on the outer peripheral side. The stator 100 has U-, V-, and W-phase magnetic poles 300. The magnetic pole 300 has
A winding wire (not shown) is wound. The rotor 200 is provided with permanent magnets m1, m2, m3, ... Which have N-pole and S-pole polarities alternately in the circumferential direction.

The movement of the rotor when forced commutation from the U phase to the W phase without initial excitation from each of the stop positions p1 to p6 will be described below with reference to the drawings. When the U phase is energized to the W phase, the polarity of the U phase becomes the N pole and the W phase becomes the S pole.

At the stop position p1, a magnet m2 is attached to the U pole of the N pole.
Is attracted, the S pole of the magnet m2 is repelled by the S pole of the W phase, and the rotor 200 rotates in the forward rotation direction Rs with the maximum torque. Similarly, at the stop position p2, the S pole of the magnet m2 is attracted to the N pole of the U phase, and the N pole of the magnet m3 is repelled, so that the rotor 200 rotates in the forward rotation direction Rs with the maximum torque. Further, at the stop position p3, the attraction force between the N pole of the U phase and the S pole of the magnet m2, and the S pole of the W phase and the magnet m.
Since the attraction force between the N poles of No. 1 is balanced with each other, no rotational force is generated on the rotor 200.

Further, at the stop position p4, the north pole of the magnet m2 is attracted to the south pole of the W phase, and the south pole of the magnet m1 is repelled, so that the rotor 200 rotates in the reverse rotation direction Rr.
Similarly, at the stop position p5, the S pole of the magnet m3 is connected to the U pole of the N pole.
As the pole is attracted, the N pole of the magnet m2 is repelled,
The rotor 200 rotates in the reverse rotation direction Rr. Further, at the stop position p6, the repulsive force between the N pole of the U phase and the N pole of the magnet m2 and the repulsive force between the S pole of the W phase and the S pole of the magnet m1 balance each other, so the rotational force with respect to the rotor 200 Does not occur.

As described above, at the stop positions p3 and p6, the starting torque is not generated or is small even if it is generated, so that the brushless motor may not be started. In particular, when the load connected to the brushless motor is large and a large starting torque is required, the problem tends to occur. For example,
Since a motor for starting an internal combustion engine (engine) has a large engine friction, even if a motor having a large capacity is used, there are many cases where a sufficient starting torque cannot be obtained. Further, since the rotor rotates in the reverse direction at the stop positions p4 and p5, a necessary induced voltage for detecting the rotor position cannot be obtained, and normal energization cannot be performed. Thus, if forced commutation is performed from the state where the motor is stopped in the free state, the probability that the motor can be normally rotated can be achieved only twice out of six times.

An object of the present invention is to solve the above problems and to provide a starting method of a brushless rotary electric machine which can obtain a large starting torque even when the position detecting element of the rotor is not used. Another object of the present invention is to provide a method for starting a brushless rotary electric machine that can cope with a passing torque by continuing to supply an upper limit current during forced commutation.

[0011]

In order to achieve the above-mentioned object, the present invention is arranged with a magnet rotor connected to the output shaft of an internal combustion engine with a phase difference of 120 ° in electrical angle. It has a first, a second, and a third phase stator winding, and is configured to sequentially energize each of the stator windings based on a rotational position detection signal of the rotor to perform forced commutation. In a method of starting a brushless rotating electric machine for driving an internal combustion engine, at the time of start-up, as a first excitation, a conduction current has a predetermined value only between any two windings of the stator windings of the first, second and third phases. Current is fixed so that the energization amount is gradually increased while the position of the magnet rotor is fixed, and then the forced commutation is performed to gradually increase the energization amount while winding each phase. The magnet rotor is forcibly rotated by sequentially forcibly energizing between the lines, Upon reaching the monitoring value DENDEN current value is set in advance, there is first characterized in that so as to continue the energization around the monitoring value.

According to this feature, during forced commutation,
Since the upper limit current can be continuously supplied, it is possible to provide a starting method of a brushless rotating electric machine that can obtain a large starting torque. Therefore, when the overriding torque for starting the internal combustion engine is required, the overriding torque can be provided to start the internal combustion engine with a large starting torque without using the position sensor. .

Further, according to the present invention, the rotational position detection signal is formed by the voltage signal induced in the winding that is not energized by the forced rotation of the magnet rotor, and the number of rotations or the number of rotations exceeds a predetermined value. After that, the second characteristic is that the winding of each phase is energized based on the rotational position detection signal.

According to this feature, after the number of rotations or the number of rotations calculated based on the rotational position detection signal reaches a predetermined value, that is, after the relationship between the commutation operation and the rotation is stabilized to some extent, the number of rotations is increased. It will be possible to automatically switch to normal operation by switching according to.

A third feature of the present invention is that the energization is stopped when the energizing current exceeds a predetermined value in the initial excitation state.

According to this feature, it becomes possible to avoid the overload operation state in the initial excitation state.

Further, the present invention has a fourth feature in that the energization control to each of the phase windings is performed by a control for quantitatively increasing or decreasing the duty of PWM.

According to this feature, it is possible to control the energization of each phase winding with a simple means.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of an engine power generator that is an embodiment of a brushless rotating electric machine, and FIG. 2 is a sectional view taken along line VV of FIG.

The engine generator 1 comprises an engine 2 and a generator 3. The generator 3 is a magnet type multi-pole generator.
The crankshaft 4 of the engine 2 is supported by the bearing 6 provided on the side wall 5a of the crankcase 5,
Be pulled out of. An annular star-shaped iron core 7 is fixed to a peripheral boss portion of a side wall 5a of a crankcase 5 surrounding the crankshaft 4 with bolts 8. The iron core 7 is an annular yoke portion 7a.
And 27 salient pole portions 7b which are radially projected therefrom.

Three-phase windings are sequentially wound around the salient pole portion 7a alternately to form a stator 8. By making the iron core 7 multi-pole in this way, a large output can be taken out, and the radial dimension of the annular yoke portion 7a and the salient pole portion 7b can be shortened, which contributes to weight reduction.

A forged hub 9 is fitted to the tip of the crankshaft 4, and a flywheel 10 also serving as a rotor yoke is joined to the hub 9. The flywheel 10 includes a disk portion 10a and a cylindrical portion 10b formed by press-molding a high-tensile steel plate into a cup shape. The disk portion 10a is fixed to the hub 9, and the cylindrical portion 10b is the salient pole portion 7b of the iron core 7.
It is attached to cover the outside.

On the inner peripheral surface of the cylindrical portion 10b of the flywheel 10, eighteen neodymium magnets 11 having a high magnetic force are fixed in the circumferential direction to form an outer rotor type magnet rotor 12. Such a rotor 12 is formed by laying the magnets 11 on the inner peripheral surface of the cylindrical portion 10b, so that a sufficient mass is secured, and thus the rotor 12 can function as a flywheel.

A cooling fan 13 is attached to the disk portion 10a of the flywheel 10. Cooling fan 13
Is a plurality of blades 13 on one side surface of the annular substrate 13a.
b is erected in the circumferential direction, and the substrate 13a is fixed to the outer surface of the disk portion 10a of the flywheel 10. The fan cover 14 that covers the cooling fan 13 forms an air guide path 14 a for cooling air that reaches the engine 2 from the side of the flywheel 10.

FIG. 3 is a system diagram of the engine generator 1. The generator 3 is driven by the (internal combustion) engine 2
Generate phase exchange. The output AC of the generator 3 is a converter 15 composed of a rectifying circuit in which semiconductor rectifying elements are assembled in a bridge.
Is full-wave rectified and converted to direct current. The direct current output from the converter 15 is smoothed by the capacitor smoothing circuit 16 and input to the inverter 17, and is converted into an alternating current of a predetermined frequency by the bridge circuit of the FETs forming the inverter 17. The alternating current output from the inverter 17 is input to the demodulation filter 18, and only low frequency components (for example, commercial frequencies) pass through. The alternating current that has passed through the demodulation filter 18 is connected to the output terminal 21 via the relay 19 and the fuse 20. The relay 19 is "open" when the engine 2 is started.
And "closed" when the engine 2 is started to a predetermined degree
become.

The generator 3 of the engine generator 1 can be used as a starter for starting the engine 2. The generator 3 has a starter driver 22 for that purpose. A rectifier circuit 23 and a smoothing circuit 24 are provided to supply a current for starting the engine 2 to the starter driver 22. The rectifier circuit 23 includes a harmonic filter 231 and a converter 232. Harmonic filter 23
1 is connected to the output terminal 21. The output side of the generator 3 is
For example, it is connected to a single-phase power supply 25 of 200 V AC, and an AC for starting is supplied from this power supply 25.
The alternating current is input to the harmonic filter 231 to remove the harmonics, converted into direct current by the converter 232, further supplied to the starter driver 22 via the smoothing circuit 24, and used as the power supply thereof.

The starter driver 22 sequentially supplies current to each phase of the three-phase winding of the generator 3 in a predetermined order in order to start the engine 2. A switching element (FET) 221 for sequentially supplying a current to each phase winding, and a CPU
222 and a sensorless drive unit 223 that does not use a sensor for detecting the position of the rotor 12 are provided. The sensorless drive unit 223 is based on voltage signals induced in the stator windings of the first, second and third phases, which are arranged with a phase difference of 120 ° in electrical angle as the rotor rotates. Then, the position of the rotor is detected and the energization of the stator winding is determined.

FIG. 4 is a flow chart of the starting control of the engine generator 1. If the generator 3 is to be started from a state in which it has stopped rotating freely, a large starting torque may not be obtained during forced commutation due to the mutual positional relationship between the rotor and the stator. Also, it may not be rotated normally. Therefore, in steps S1 and S2, the first and second initial excitation for displacing the rotor 12 to the mutual relation position of the rotor and the stator in which the maximum torque is obtained by the forced commutation and the rotor is normally rotated. I do. By these initial excitations, the rotor 12 can be displaced to a predetermined position where the maximum torque is obtained. The first and second initial excitations are different in the phases of energizing each other, but the processing is the same (described later). As will be described later, with two initial excitations,
When the rotor / stator is in the free stop state, that is, what mutual positional relationship (stop position p1 in FIG.
It is possible to displace the rotor 12 to the predetermined position even when the rotor 12 is stopped at (p6). In addition,
If the initial excitation time is too short, the rotor movement will not stabilize,
Since it swings at the position where it should be stopped, the energization time of the initial excitation is preferably the time until the position of the rotor stabilizes, for example, about 1 second.

In step S3, forced commutation is performed. In the forced commutation, one-phase energization is performed based on the positional relationship between the rotor and the stator that can obtain the maximum torque after the second initial excitation.
Due to the forced commutation, the induced voltage is detected from the non-energized phase, and the position of the rotor 12 is detected based on this induced voltage. When the induced voltage is detected and the position of the rotor 12 is detected, the process proceeds to step S4 to perform normal energization, that is, normal energization.

FIG. 5 is a flow chart showing the process of initial excitation (common to the first and second initial excitations). Step S
At 10, the FET 221 is controlled to energize a predetermined phase. The first initial excitation energizes the V phase to the U phase, and the second initial excitation energizes the V phase to the W phase. In step S11, the initial value of the energization duty is increased by a predetermined increase value (for example, 1%). In step S12, it is determined whether or not the rotor 12 has stopped at the initial positions (p1 ′ to p6 ′ described later) of the rotor / stator after the counter electromotive force has been generated. Back electromotive force is "0" if stopped
Therefore, it can be determined whether or not the rotor 12 is stopped at the initial position depending on whether or not the back electromotive force is “0”. In this determination step, it is determined whether or not the counter electromotive force is “0” after the counter electromotive force is once generated. If the counter electromotive force is never generated, it is determined as “no”. . If step S12 is affirmative, it is determined that the initial excitation has ended, and if the first initial excitation, the second initial excitation,
At the time of the second initial excitation, the commutation shifts to forced commutation.

When the result in step S12 is negative, the process proceeds to step S13, in which it is determined whether the energization duty of the FET 221 is equal to or higher than a predetermined upper limit value (for example, 50%). If it is not more than the upper limit value, the current duty is energized (step S14) and the process proceeds to step S11. On the other hand, even if the duty reaches the upper limit value, in other words, the energizing current exceeds the predetermined value, the rotor 12 is in the initial position (p1 ′ to p6 ′ in FIG. 6 and FIG. 7 described later, or P1 ″). If the back electromotive force is not generated, or if the counter electromotive force is never generated, step S13 is performed.
Is affirmative, and it is determined that the locked state or the overloaded state is set, and the duty is set to "0" in step S15
The fail ends (step S16).

Here, the operations of the first initial excitation and the second initial excitation will be specifically described with reference to FIGS. 6 and 7. The leftmost stop positions p1 to p6 in FIGS. 6 and 7 are
The initial stop position of the rotor 200 with respect to the stator 100 when the generator naturally stops is shown as p1 in FIG.
Is the same as p6. Now, for the first initial excitation, V
When electricity is applied from the phase to the U phase, the polarity of the V phase becomes the N pole and the polarity of the U phase becomes the S pole. Therefore, the permanent magnet m2 of the rotor 200 at the initial stop position p1 is attracted to the V-phase N pole,
The permanent magnet m3 is attracted to the U-phase S pole, and the stator 100
And the magnetic poles of the rotor 200 are balanced, the rotor 200 does not move and reaches the stop position p1 ′. For the same reason, the mutual positional relationship between the stator 100 and the rotor 200 at the initial stop positions p2 to p6 becomes the stop positions p2 ′ to p6 ′, respectively. As is clear, the stop position p
Of 1'-p6 ', only the stop position p4' is different from the other stop positions.

Next, for the second initial excitation, from the V phase to W
When the phases are energized, the polarity of the V phase becomes the N pole and the polarity of the W phase becomes the S pole. As a result, the S pole of the rotor 200 repels the W phase S pole and the N pole is attracted, so that the S pole permanent magnet m2 is located at the V phase N pole position and the N pole permanent magnet m1 is located at the W phase S pole position. The rotor 200 is stopped in the state where it comes. This stop position p1 ''
Is all stop positions p obtained as a result of the first initial excitation.
Obviously, this can be obtained by subjecting 1 ′ to p6 ′ to the second initial excitation. That is, at the first stop positions p1 to p6, the first,
When the second initial excitation is applied, it can be converged to one stop position p1 ″. The positional relationship between the stator and the rotor is U due to energization from the U phase to the W phase, which is the next forced commutation.
This is the position where the largest starting torque is generated during normal rotation when the phase becomes the N pole and the W phase becomes the S pole.

Therefore, if forced commutation is applied to the generator in the stop position p1 ″, the generator is started from the positional relationship between the rotor and the stator that produces the largest torque, so the generator smoothly moves to the forward rotation side. It starts to rotate.

Next, the excitation time of the first and second initial excitation will be described with reference to FIG. FIG. 11 shows the time required for the movement of the rotor to stabilize when the stator and the rotor at the initial stop positions p1 to p6 are subjected to one-phase excitation. If the initial excitation time is too short, the movement of the rotor will be unstable and the rotor will oscillate at the position where it should be stopped. As is apparent from the figure, the time from the start of the initial excitation to the stabilization of the rotor movement is the largest at the initial stop position p5, that is, 0.7 seconds. Therefore, in consideration of safety, it is preferable that the energization time of the initial excitation until the movement of the rotor stabilizes is, for example, about 1 second.

FIG. 8 is a flow chart showing the process of forced commutation. In step S20, a predetermined phase, for example, the U phase to the W phase is energized. In step S21, the duty of PWM is gradually increased, for example, by 1%. In step S22, whether the torque required to start the engine, for example, the current for obtaining the overriding torque that requires a particularly large torque has reached a value (= overcurrent) that exceeds the upper limit value set based on the energization allowable value. It is judged whether or not.

When the determination in step S22 is affirmative, that is, when the upper limit value is reached, the process proceeds to step S24 to protect the switching elements of the driver, and the duty is reduced by 1%, for example. Then, in step S25, the forced commutation is executed / continued with the duty reduced by 1%.

When the determination in step S22 is negative, the number of revolutions of the internal combustion engine is the preset number of revolutions,
For example, it is determined whether the number of revolutions is 10 or more, and when this determination is affirmative, it is determined that the rotation due to forced commutation has reached the stable region, the forced commutation is terminated, and the normal energization of FIG. 10 is performed. . The number of rotations may be used instead of the number of rotations.

During the above operation, the sensorless drive unit 22
Reference numeral 3 forms a rotational position detection signal by a voltage signal induced in a winding that is not energized, and drives the rotor based on the rotational position detection signal. Further, the number of revolutions or the number of revolutions of the internal combustion engine can be detected from the rotational position detection signal.

As described above, in the present embodiment, the energization control to each phase winding is performed by quantitatively increasing / decreasing the PWM duty. That is, a limiter for limiting the energizing current to a predetermined value is provided, and the PWM duty is gradually increased until the preset upper limit value is reached, so that wasteful large current energization is eliminated and energization to each winding is efficiently performed. be able to. Further, when the upper limit value is reached, the duty is reduced, so that it is possible to continue energizing each winding with a duty that does not cause an overcurrent.

FIG. 9 is a flowchart showing a modified example of forced commutation. Due to the capabilities of the switching element and the driver of the engine generator 1, it may be necessary to execute forced commutation several times even in an overcurrent state in which the upper limit value is exceeded to overcome the overriding torque. This modification is suitable for such a case, and the same or equivalent processes as those of FIG. 8 are designated by the same step numbers and the description thereof is omitted.

When it is determined in step S22 that the current is an overcurrent, the process proceeds to step S31 and the counter value is incremented by one. In step S32, it is determined whether or not the counter value has become larger than 10, for example, and in the case of negative, the process proceeds to step S25 to execute forced commutation with the duty of the overcurrent. The forced commutation due to the overcurrent is continued until the counter value reaches 10, and if the overcurrent still continues (the determination in step S32 is negative), the duty is reduced by 1%.

FIG. 10 is a flow chart showing the process of normal energization. In step S41, the duty is increased by 1%, and in step S42, it is determined whether or not it is a preset upper limit value, that is, whether it is overcurrent. If the determination is negative, the process proceeds to step S43. Is determined to be equal to or higher than the set rotation speed (for example, 800 rpm). If this determination is affirmative, it is determined that the engine has started and the operation of the starter is terminated. That is, the process proceeds to step S44 and the duty is set to 0%. On the other hand, when the determination in step S42 is positive,
In step S45, the duty is reduced by 1%, and in step S46, the operation is executed with the duty at that time.

FIG. 12 is a graph showing an example of changes in the energizing current from the forced commutation after the end of the initial excitation to the normal energization, changes in the PWM duty, and changes in the crank rotation speed of the engine. From this graph, it can be seen that when the engine is started, the starting current does not increase sharply and rises smoothly, and the starting rotation speed also rises smoothly.

[0045]

As is apparent from the above description, according to the inventions of claims 1 to 4, the start of an internal combustion engine having a large starting torque can be performed by a brushless rotation without a position detecting element such as a hall element. It becomes possible to do it using an electric machine. Further, in the case of forced commutation, when the overcoming torque for starting the internal combustion engine is required, the upper limit current can be continuously supplied, so that the internal combustion engine with a large starting torque can be started. Therefore, it becomes easy to use the brushless generator also as a brushless starter motor.

According to the invention of claim 2, further,
After the number of rotations calculated based on the rotation position detection signal or the number of rotations reaches a predetermined value, that is, after the relationship between commutation operation and rotation is stabilized to some extent, normal operation is performed by switching according to the number of rotations. Since it is possible to switch automatically, switching to normal operation is easy and smooth.

According to the invention of claim 3, further,
It becomes possible to avoid the overload operation state in the initial excitation state.

According to the invention of claim 4, further,
With a simple means, it becomes possible to control the energization of each phase winding and improve the reliability.

[Brief description of drawings]

FIG. 1 is a side view of an engine power generator that is an embodiment of a brushless rotating electric machine to which the present invention is applied.

FIG. 2 is a sectional view taken along line VV of FIG.

FIG. 3 is a system diagram of an engine power generator.

FIG. 4 is a flowchart of start control of the engine power generator.

FIG. 5 is a flowchart of control of initial excitation.

FIG. 6 is an explanatory diagram of operations of first and second initial excitation.

FIG. 7 is an explanatory diagram of an operation of first and second initial excitation.

FIG. 8 is a flow chart of control of the first embodiment of forced commutation.

FIG. 9 is a flowchart of the control of the second embodiment of forced commutation.

FIG. 10 is a flowchart of control of normal energization.

FIG. 11 is a diagram showing the stabilization time of the rotor when one-phase excitation is performed at the initial stop positions p1 to p6.

FIG. 12 is a diagram showing the change in the energization current from the forced commutation after the completion of the initial excitation to the normal energization, the change in the PWM duty,
FIG. 5 is a diagram showing changes in the crank rotation speed of the engine.

FIG. 13 is a diagram showing a relative positional relationship between a stator and a rotor when stopped in a free state.

[Explanation of symbols]

3 ... Generator, 15 ... Converter, 17 ... Inverter, 18 ... Demodulation filter, 19 ... Relay, 22 ... Starter driver, 23 ... Rectifier circuit, 25 ... Power supply, 10
0 ... Stator, 200 ... Rotor, 300 ... U, V,
W-phase magnetic pole.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshinori Inagawa             1-4-1 Chuo 1-4-1 Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Yoshihiro Iijima             1-4-1 Chuo 1-4-1 Wako City, Saitama Prefecture             Inside Honda Research Laboratory F-term (reference) 5H560 AA08 BB04 BB12 DA13 DA19                       EB01 EB02 ED09 HA02 HA04                       HA07 HA09 JJ02 SS02 SS04                       SS07 UA06 XA12

Claims (4)

[Claims] 1. A magnet rotor connected to an output shaft of an internal combustion engine, and first, second, and third phase stator windings arranged with a phase difference of 120 ° in electrical angle. Then, in the starting method of the brushless rotary electric machine for driving an internal combustion engine, which is configured to sequentially energize each of the stator windings based on the rotation position detection signal of the rotor to perform forced commutation. In order to gradually increase the energization amount while monitoring so that the energizing current does not exceed a predetermined value only between any two of the first, second and third phase stator windings. Energize to fix the position of the magnet rotor, and then, as the forced commutation, forcibly energize sequentially between the windings of each phase while gradually increasing the energization amount to force the magnet rotor. When the energizing current value reaches the preset monitoring value, The method of starting an internal combustion engine for driving a brushless rotary electric machine, characterized in that so as to continue the energization in the near. 2. A rotational position detection signal is formed by a voltage signal induced in a winding that is not energized by the forced rotation of the magnet rotor, and after the number of rotations or the number of rotations exceeds a predetermined value, The power supply to the winding of each phase is performed based on a rotational position detection signal.
A method for starting a brushless rotating electric machine for driving an internal combustion engine according to claim 1. 3. The brushless rotary electric machine for driving an internal combustion engine according to claim 1, wherein when the energized current exceeds a predetermined value in the initial excitation state, energization is stopped. How to start. 4. The internal combustion engine drive according to claim 1, wherein the energization control for each phase winding is performed by a control for quantitatively increasing / decreasing a PWM duty. Brushless rotating electric machine starting method.