JP4654981B2 - Fixed structure of magnetic flux detection element - Google Patents

Description

  The present invention relates to a structure for fixing a magnetic flux detection element, and more particularly to a structure for fixing a magnetic flux detection element capable of suppressing the influence of a magnetic field from a stator during operation.

Conventionally, motors are disclosed in, for example, Japanese Patent Laid-Open No. 4-289759 (Patent Document 1), Japanese Utility Model Laid-Open No. 63-88073 (Patent Document 2), and Japanese Utility Model Laid-Open No. 2-136477 (Patent Document 3). .
JP-A-4-289759 Japanese Utility Model Publication No. 63-88073 Japanese Utility Model Publication No. 2-136477

  In the prior art, the axial length is shortened by arranging a Hall sensor between the teeth of the stator. However, it is easily affected by the magnetic field from the stator, and depending on the Hall sensor mounting position, there is a problem that the detection accuracy is lowered due to the influence of the magnetic field.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a magnetic flux detection element fixing structure capable of detecting the rotational position of a rotor with high accuracy.

A fixing structure of a magnetic flux detection element according to the present invention includes a stator having a plurality of tooth portions extending in the radial direction provided on the outer peripheral side of the rotor, a magnetic flux detection element installed between the tooth portions, and a magnetic flux detection element. A holder for holding, the outer peripheral surface of the holder contacts the tip of the tooth portion, the inner peripheral surface of the holder faces the rotor, and the magnetic flux detection element is offset from the central position between the tooth portions in the rotational direction of the rotor. Be placed.

  The magnetic flux detection element fixing structure configured as described above suppresses the influence of the magnetic field generated in the vicinity of the tooth portion when the stator magnetic field is advanced at the time of high rotation on the magnetic flux detection element when the motor is operated. be able to. As a result, the rotational position of the rotor can be detected with high accuracy.

  According to the present invention, it is possible to provide a magnetic flux detection element fixing structure capable of accurately detecting the rotational position of the rotor.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of an engine system on which an electric supercharger according to Embodiment 1 of the present invention is mounted. Referring to FIG. 1, an engine system equipped with an electric supercharger according to an embodiment of the present invention includes an engine 100, an electric supercharger 200 that supplies air sent to engine 100, an electric supercharger, It includes an intercooler 162 that cools the air compressed by the charger 200, an engine ECU (Electronic Control Unit) 250 that controls the operation of the engine 100, and a supercharger ECU 340 that controls the electric supercharger 200. The engine system according to this embodiment is mounted on a vehicle such as an automobile. Engine ECU 250 and supercharger ECU 340 may be integrated into one ECU. In the present embodiment, engine ECU 250 and supercharger ECU 340 are connected so that they can communicate in both directions.

  Air sucked from the intake hole 150 is filtered by the air cleaner 152. The air filtered by the air cleaner 152 flows to the electric supercharger 200 via the intake passage 156. The air flowing through the electric supercharger 200 is compressed by the compressor wheel 206 in the compressor housing 202, then flows through the intake passage 160 and is cooled by the intercooler 162. The air cooled by the intercooler 162 flows through the intake passage 102 and is taken into the engine 100.

  An air flow meter 154 that detects the amount of intake air is provided in the middle of the intake passage 156. Air flow meter 154 transmits a signal indicating the detected intake air amount to engine ECU 250.

  The intercooler 162 cools the air that has been compressed by the compressor wheel 206 and has risen in temperature. Since the accumulation of cooled air is smaller than that before cooling, more air is sent into the engine 100.

  A bypass passage 158 that bypasses the intake passage 156 and the intake passage 160 is provided, and an air bypass valve 164 that adjusts the amount of air flowing through the bypass passage 158 is provided in the middle of the bypass passage 158. Air bypass valve 164 operates in accordance with a control signal received from engine ECU 250.

  A throttle valve 166 that adjusts the flow rate of air flowing through the intake passage 102 is provided in the middle of the intake passage 102. The throttle valve 166 is driven by a throttle motor 168. Throttle motor 168 is driven in accordance with a control signal received from engine ECU 250.

  An intake pipe pressure sensor 170 and an intake air temperature sensor 172 are provided in the intake passage 102. The intake pipe pressure sensor 170 detects the pressure of air in the intake passage 102. Intake pipe pressure sensor 170 transmits a signal indicating the detected air pressure to engine ECU 250. The intake air temperature sensor 172 detects the temperature of air in the intake passage 102. Intake air temperature sensor 172 transmits a signal indicating the detected air temperature to engine ECU 250.

  Engine 100 includes a cylinder head (not shown) and a cylinder block 112. The cylinder block 112 is provided with a plurality of cylinders in the vertical direction of the drawing in FIG. In each cylinder, a piston 114 is fitted so as to be slidable in a predetermined direction. The piston 114 is connected to the crankshaft 120 via the connecting rod 116. The piston 114, the connecting rod 116, and the crankshaft 120 form a crank mechanism.

  A combustion chamber 108 is formed at the upper part of the piston 114. The combustion chamber 108 is provided with a spark plug 110 and a fuel injection injector 106 toward the combustion chamber 108. Although engine 100 is described as being a direct injection engine in the present embodiment, it is not particularly limited to a direct injection engine. For example, the engine 100 may be an internal combustion engine, and may be a port injection type engine or a diesel engine. Further, the engine is not limited to a reciprocating engine, and may be a rotary engine.

  Further, regarding the arrangement of the cylinders, various shapes such as a V-type, a W-type, and a horizontally opposed type can be employed in series.

  In the cylinder head, an intake passage 102 and an exhaust passage 130 are provided so as to be connected to the combustion chamber 108, respectively. An intake valve 104 is provided between the intake passage 102 and the combustion chamber 108. An exhaust valve 128 is provided between the exhaust passage 130 and the combustion chamber 108. The intake valve 104 and the exhaust valve 128 are driven by a camshaft (not shown) that rotates in conjunction with the crankshaft 120.

  The air flowing through the intake passage 102 is sucked into the combustion chamber 108 by opening the intake valve 104 when the piston 114 descends.

  The air flowing into the combustion chamber 108 is mixed with the fuel injected from the fuel injection injector 106. When the intake valve 104 is closed and the piston 114 rises to near the top dead center, the air mixed with fuel is ignited and burned in the spark plug 110. Piston 114 is pushed down by the pressure by combustion. At this time, the vertical motion of the piston 114 is converted into the rotational motion of the crankshaft 120 via the crank mechanism. When the piston 114 is lowered to near the bottom dead center, the exhaust valve 128 is opened. When the piston 114 rises again, the air combusted in the combustion chamber 108, that is, the exhaust gas, passes through the exhaust passage 130. The air that has passed through the exhaust passage 130 drives the turbine wheel 208 of the electric supercharger 200, and then flows through the exhaust pipe 180 and is guided to the catalyst 182. The exhaust gas is purified by the catalyst 182 and then discharged outside the vehicle.

  A pulley (not shown) is provided at one end of the crankshaft 120. The pulley is connected to a pulley provided on the rotating shaft of the alternator 126 via a belt 124. The alternator 126 is activated by the rotation of the crankshaft 120 to generate power.

  The timing rotor 118 is provided on the crankshaft 120 and rotates together with the crankshaft 120. A plurality of protrusions are provided on the outer periphery of the timing rotor 118 at predetermined intervals. The crank position sensor 122 is provided to face the protrusion of the timing rotor 118. When the timing rotor 118 rotates, the air gap between the projection of the timing rotor 118 and the crank position sensor 122 changes, so that the magnetic flux passing through the coil portion of the crank position sensor 122 increases and decreases, and an electromotive force is generated in the coil portion. . Crank position sensor 122 transmits a signal representing the electromotive force to engine ECU 250. Engine ECU 250 detects the crank angle based on the signal transmitted from crank position sensor 122.

  Further, the vehicle is provided with a vehicle speed sensor (not shown) on the wheel, and detects the rotation speed (rotation speed) of the wheel. The vehicle speed sensor transmits a signal indicating the detection result to the engine ECU. Engine ECU 250 calculates the vehicle speed from the rotational speed of the wheel. Engine ECU 250 performs arithmetic processing based on signals transmitted from each sensor such as intake pressure, intake air temperature, intake air amount, wheel speed, maps and programs stored in memory, and engine 100 enters a desired operating state. As such, the auxiliary machinery is controlled.

  The electric supercharger 200 includes a compressor housing 202, a turbine housing 204 provided to face the compressor housing 202, a rotating electrical machine 216 accommodated between the compressor housing 202 and the turbine housing 204, and a rotating shaft of the rotating electrical machine 216. And a turbine shaft 210.

  A compressor wheel (also referred to as a compressor rotor, a compressor blade, etc.) 206 is accommodated in the compressor housing 202. The compressor wheel 206 compresses (supercharges) the air filtered by the air cleaner 152.

  A turbine wheel (also referred to as a turbine rotor, a turbine blade, or the like) 208 is accommodated in the turbine housing 204. The turbine wheel 208 is rotated by exhaust gas.

  The compressor wheel 206 and the turbine wheel 208 are provided at both ends of the turbine shaft 210, respectively. That is, when the turbine wheel 208 is rotated by the exhaust gas, the compressor wheel 206 is also rotated.

  A rotating electrical machine 216 having a rotating shaft as the turbine shaft 210 is provided between the compressor wheel 206 and the turbine wheel 208. The turbine shaft 210 is rotatably supported by the housing of the rotating electrical machine 216.

  The rotating electrical machine 216 applies a rotational force of the turbine shaft 210 by electric power supplied from a supercharger EDU (Electronic Drive Unit) 330 according to a control signal of the supercharger ECU 340. The supercharger EDU 330 uses the power supplied from the high voltage battery 320 to supply power to the rotating electrical machine 216 according to the control signal input from the supercharger ECU 340. Supercharger EDU330 is an inverter, for example.

  The rotating electrical machine 216 is provided with a sensor (not shown in FIG. 1) for determining the position of the rotor. The sensor detects the rotational position (rotational angle) and rotational speed of the rotor 1210. The sensor transmits a signal indicating the detection result to the supercharger ECU 340. This sensor is composed of, for example, a hall sensor.

  High voltage battery 320 is electrically connected to DC / DC converter 310. The DC / DC converter 310 is electrically connected to the alternator 126 described above. Therefore, the electric power generated in the alternator 126 is boosted to an appropriate voltage by the DC / DC converter 310 and then supplied to the high voltage battery 320. Thereby, the high voltage battery 320 is filled. In addition, the electric power generated by the alternator 126 is supplied to the low voltage battery 300. Thereby, the low voltage battery 300 is charged. The low voltage battery 300 supplies electric power to the engine ECU 250, the supercharger ECU 340, and the like.

  Supercharger ECU 340 performs arithmetic processing based on information transmitted from engine ECU 250, a signal transmitted from a rotor position sensor, and a map and a program stored in memory, and electric supercharger 200 performs a desired process. Auxiliary equipment is controlled so as to be in an operating state. In the electric supercharger 200 having the above configuration, after the air mixed with fuel is burned in the engine 100, the exhaust gas is guided from the exhaust passage 130 to the turbine housing 204. The exhaust gas then rotates the turbine wheel 208 and the rotational force is transmitted to the turbine shaft 210. Thereafter, the exhaust gas flows through the exhaust pipe 180 and is guided to the catalyst 182. The exhaust gas guided to the catalyst 182 is exhausted outside the vehicle in a purified state.

  On the other hand, the air taken from outside the vehicle to be supplied to the engine 100 is filtered by the air cleaner 152, then flows through the intake passage 156 and is guided into the compressor housing 202. The air is compressed (supercharged) by a compressor wheel 206 that rotates integrally with the turbine shaft 210. The compressed air is guided to the intercooler 162 and is sucked into the combustion chamber 108 through the intake passage 102 of the engine 100 in a cooled state.

  Further, supercharger ECU 340 determines that the air compressed in compressor wheel 206 does not reach a desired supercharging pressure in the low rotation range of engine 100 (for example, the rotation speed of engine 100 is equal to or lower than a predetermined rotation speed). In this case, the supercharging pressure in the compressor housing 202 is controlled to be forcibly increased by driving the rotary electric machine 216.

  FIG. 2 is a cross-sectional view of the rotating electrical machine. FIG. 2 is a cross-sectional view in a direction orthogonal to the rotation axis. Referring to FIG. 2, rotating electric machine 216 includes a rotor 1210 located at the center and a stator 1300 surrounding rotor 1210. A turbine shaft 210 is provided at the center of the rotor 1210, and the turbine shaft 210 constitutes a rotating shaft. The rotor 1210 is rotatably held around the turbine shaft 210 in the direction indicated by the arrow R. The rotor 1210 has a rotor core 1211 constituted by laminated electromagnetic plywood, and a permanent magnet 1212 embedded in the rotor core 1211. The permanent magnet 1212 is inserted into a hole provided in the rotor core 1211 and fixed with, for example, an adhesive. The permanent magnet 1212 is configured to extend in a direction along the turbine shaft 210.

  The rotor core 1211 is not limited to an electromagnetic steel plate, and may be made of a material obtained by compressing and sintering a magnetic material powder, for example.

  Stator 1300 includes a stator core 1310 located on the outer periphery and a coil 1320 wound around a tooth portion 1311 of stator core 1310. In this embodiment, an example of a concentrated winding three-phase AC motor is shown. The rotating electrical machine 216 is not limited to a three-phase AC motor, and may be either a DC motor or an AC motor. Further, in the case of an AC motor, it may be an induction motor, a synchronous motor, or an AC commutator motor, and may be either single phase or three phase.

  The coil 1320 is configured by winding a copper wire around the tooth portion 1311. Between the plurality of tooth portions 1311 is a slot portion 1312, and a coil 1320 is disposed in this portion. Although the number of teeth portions 1311 is six in this embodiment, the number is not limited to this, and more or fewer teeth portions 1311 may be employed.

  Since this embodiment shows a three-phase AC motor, the coils constituting the U phase, the V phase, and the W phase are respectively connected. As the connection method, either delta connection or Y connection can be adopted. Magnetic lines of force as indicated by arrows are generated between the rotor 1210 and the stator 1300. The direction of the magnetic lines of force changes sequentially as the rotor 1210 rotates and the current flowing through the coil 1320 changes.

  Hall element 1410 is arranged between adjacent teeth 1311. The Hall element 1410 is held by the protruding portion 1409 of the holder 1400. The outer peripheral surface 1406 of the holder 1400 is in contact with the tip 1313 of the tooth portion 1311. An inner peripheral surface 1405 of the holder 1400 is a cylindrical surface and faces the rotor 1210.

  In this embodiment, the turbine shaft 210 as the rotating shaft of the rotor 1210 is connected to the turbine wheel 208 and the compressor wheel 206, and constitutes a so-called turbocharger shaft. The electric machine 216 may rotate the rotor of the supercharger. In this embodiment, the rotating electrical machine 216 is used to maintain the rotation of the turbocharger that uses the energy of the exhaust gas. However, the rotation of the supercharger that supercharges the intake air without using the energy of the exhaust gas is not limited to this. The rotating electrical machine 216 according to the present invention may be employed to maintain

  The holder 1400 is made of a nonmagnetic material so as not to affect the magnetic characteristics of the rotor 1210 and the stator 1300. A Hall element 1410 is fixed to the outer peripheral surface of the holder 1400, and the Hall element 1410 can detect the rotation angle and the rotation speed of the rotor 1210.

  In this embodiment, only one Hall element 1410 is provided. However, the present invention is not limited to this, and a plurality of Hall elements 1410 may be provided.

  The hall element 1410 is located on the outer side in the radial direction from the tip 1313 of the tooth portion 1311. A Hall element 1410 is installed between the plurality of coils 1320.

  3 is a cross-sectional view taken along line III-III in FIG. Referring to FIG. 3, turbine shaft 210 rotates about rotating shaft 3210. A rotor core 1211 and a permanent magnet 1212 are disposed on the outer periphery of the turbine shaft 210. When the total length of the turbine shaft 210 is L, a region whose distance from the end 1210e is within L / 3 is an end region 213, 214, and a center region 212 is between the two end regions 213, 214. It is. That is, a region near the center line 4210 located at the center in the longitudinal direction of the rotor 1210 is the center region 212, and regions far from the center line 4210 are the end regions 213 and 214. The hall element 1410 is provided in the central region 212. It is only necessary that the central portion of the Hall element 1410 is located in the central region 212. In the rotor 1210 and the stator 1300, it is shown that the magnetic field density in the central region 212 is high and the magnetic field density in the end regions 213 and 214 is low. In this embodiment, by installing the Hall element 1410 in the central region 212 having a high magnetic field density, the magnetic flux can be reliably detected, and the S / N ratio (signal / noise ratio) can be improved. The region within 30% of L from the end 1210e is the end region 213, 214, and the other region is the central region 212.

  In other words, in the present invention, the rotor 1210 includes the permanent magnet 1212, and the Hall element 1410 is arranged within a range of 40% or less of the total length from the center line 4210 with respect to the total length of the rotor 1210. The hall element 1410 is also disposed on the outer diameter side of the tip 1313 of the tooth portion 1311.

  FIG. 4 is a graph showing a relationship between a distance (Gap, hereinafter referred to as a gap) between the rotor 1210 and the stator 1300 and a set range (± A). Referring to FIG. 4, when the gap is large, the setting range ± A is reduced. Specifically, the Hall element 1410 is disposed in a region near the center line 4210. On the contrary, if the gap is reduced, the Hall element 1410 is disposed at a position far from the center line 4210.

  That is, according to the first embodiment, the rotating electrical machine 216 is provided with a rotor 1210, a stator 1210 provided on the outer peripheral side of the rotor 1210 and having a plurality of tooth portions 1311, and a hole as a magnetic flux detecting element installed between the tooth portions 1311. And an element 1410. The Hall element 1410 is separated from the axial end portion 1210e of the rotor 1210 by 30% or more of the entire length L. In addition, the hall element 1410 is installed in the outer peripheral direction by a predetermined distance from the tip 1313 of the tooth portion 1311.

  In the rotating electric machine 216 configured as described above, the magnetic field of the rotor 1210 does not leak to the end portion 1210e within the range where the Hall element 1410 is installed, and the magnetic flux of the rotor 1210 can be detected with high accuracy. When the stator 1300 is energized, this energization becomes a disturbance when the Hall element 1410 detects the rotor magnetic field. The vicinity of the tip 1313 of the tooth portion 1311 is easily affected by energization, and the position detection accuracy may be deteriorated during energization. In this embodiment, since the Hall element 1410 is disposed on the outer diameter side, the Hall element 1410 is separated from the tip 1313. As a result, the influence of energization can be reduced and the detection accuracy can be improved.

(Embodiment 2)
FIG. 5 is a sectional view of a rotating electrical machine according to the second embodiment of the present invention. Referring to FIG. 5, in rotating electric machine 216 according to the second embodiment of the present invention, hall element 1410 is provided in the rotational direction offset from center line 1319 of slot portion 1312, in the first embodiment. Is different from the rotating electrical machine 216 according to A current is supplied to the coil 1320 from the energization unit 1500. When the rotating electrical machine 216 operates as a motor for high rotation, so-called advance control is performed in which the power application timing is advanced during high rotation. This advance angle affects the magnetic field in the slot portion 1312 and may cause an error in the output of the Hall element 1410. Therefore, the Hall element 1410 is preliminarily shifted in the rotation direction. As a result, the position can be detected in a region where there is little change in the magnetic field even at the advance angle, so that no error occurs in the output of the Hall element 1410, and the position detection accuracy can be improved.

  The Hall element 1410 is provided on the downstream side of the rotation. A Hall element 1410 is provided on the rear side of the rotation with respect to the center line 1319.

  That is, in the detection element fixing structure according to the second embodiment, the Hall element 1410 as the magnetic flux detection element is installed at a position offset in the rotation direction of the rotor 1210 from the center line 1319 between the teeth portions 1311. In this embodiment, the Hall element 1410 may or may not be provided at the position shown in FIG. 3 of Embodiment 1. That is, the total length of the rotor 1210 may be L, and the Hall element 1410 may be installed at a position where the distance from the end portion 1210e as the end face of the rotor 1210 is more than 30% of the total length of the rotor 1210. A Hall element 1410 may be installed at the position. That is, the Hall element 1410 may be installed in the central region 212 of FIG. 3, or the Hall element 1410 may be installed in the end regions 213 and 214.

  FIG. 6 is a graph for explaining the advance angle control. Referring to FIG. 6, the magnetic flux detected by the sensor on center line 1319 becomes the largest when there is no advance control. On the other hand, when there is advance control (“with advance” in FIG. 6), a magnetic flux peak appears at a position shifted in the rotational direction. Therefore, by providing the Hall element 1410 at a position shifted in the rotational direction with respect to the center line 1319, the position can be detected more reliably and the position detection accuracy is improved.

  FIG. 7 is a cross-sectional view parallel to the shaft of the rotating electrical machine. Referring to FIG. 7, Hall element 1410 held by holder 1400 is located at a substantially central portion in the longitudinal direction of turbine shaft 210 of stator core 1310. The Hall element 1410 does not need to be positioned at the center, and may be positioned at any portion in the longitudinal direction.

  A coil 1320 is wound around the stator core 1310. Stator core 1310 faces rotor 1210. The rotor 1210 is fixed to a turbine shaft 210 as a rotating shaft. The turbine shaft 210 is rotatably held by a bearing 211. The bearing 211 may be a fluid bearing or a ball bearing. The rotor 1210 includes a rotor core 1211 and permanent magnets 1212 embedded in the rotor core 1211. The permanent magnet 1212 extends in the longitudinal direction along the turbine shaft 210.

  FIG. 8 is a cross-sectional view showing a rotating electrical machine according to a comparative example. Referring to FIG. 8, in rotating electric machine 216 according to the comparative example, detection permanent magnet 1415 is attached to turbine shaft 210, and Hall element 1410 detects the position of permanent magnet 1415. In the rotating electrical machine 216 according to such a comparative example, the Hall element 1410 is disposed outside the rotating electrical machine 216. The permanent magnet 1415 for detection is placed away from the permanent magnet 1212 so as to be independent of the magnetic field of the rotor 1210. Therefore, the shaft length becomes long. On the other hand, in the product of the present invention shown in FIG. 7, the shaft length can be shortened and the speed can be increased. Further, since the position of the rotor 1210 can be detected by the magnetic field of the permanent magnet 1212 constituting the rotor 1210, the position detection accuracy and the S / N ratio can be improved.

  The detection element fixing structure according to the second embodiment has the same effect as the detection element fixing structure according to the first embodiment.

(Embodiment 3)
FIG. 9 is a cross-sectional view of a rotating electrical machine according to Embodiment 3 of the present invention. Referring to FIG. 9, in rotating electrical machine 216 according to the third embodiment of the present invention, the Hall element 1410 is fixed by a mold member 1330 and the holder is not provided. 2 is different from the rotating electrical machine 216 according to 2. The inner peripheral surface 1331 of the mold member 1330 has a cylindrical shape, and the cylindrical surface forms the same surface as the tip 1313 of the tooth portion 1311. In this embodiment, only one Hall element 1410 is provided. However, the present invention is not limited to this, and a plurality of Hall elements 1410 may be provided between the teeth portions 1311. The cross section parallel to the turbine shaft 210 is substantially the same as the cross section shown in FIG. That is, the Hall element 1410 is installed in the central region 212. Further, as shown in the second embodiment, the hall element 1410 may be provided in the slot portion 1312 at a position offset in the rotational direction with respect to the center.

  The rotating electrical machine according to the third embodiment configured as described above has the same effect as the rotating electrical machine according to the first and second embodiments.

  Although the embodiment of the present invention has been described above, the embodiment shown here can be variously modified. First, the rotating electrical machine to which the present invention is applied is not limited to the concentrated winding three-phase AC motor shown in the first to third embodiments, but may be a distributed winding three-phase AC motor.

  Furthermore, the present invention can be applied not only to a three-phase motor but also to a single-phase motor, an induction motor, a commutator motor, and the like as an AC motor.

  Further, the fixing structure of the magnetic flux detection element according to the present invention can be employed not only as a rotating electric machine but also as a structure for detecting the rotation of the resolver rotor.

  Furthermore, when the structure according to the present invention is applied to a rotating electrical machine, not only the rotating electrical machine that rotates the supercharger as shown in FIG. 1, but also a wheel that is attached to the power transmission device of the vehicle and rotates. Or you may use as a rotary electric machine for converting the rotational energy of a wheel into electrical energy.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the structure of the engine system by which the electric supercharger according to Embodiment 1 of this invention is mounted. It is sectional drawing of a rotary electric machine. It is sectional drawing along the III-III line in FIG. It is a graph which shows the relationship between the distance between the rotor 1210 and the stator 1300, and a setting range (± A). It is sectional drawing of a rotary electric machine according to Embodiment 2 of this invention. It is a graph for demonstrating advance angle control. It is sectional drawing parallel to the shaft of a rotary electric machine. It is sectional drawing which shows the rotary electric machine according to a comparative example. It is sectional drawing of the rotary electric machine according to Embodiment 3 of this invention.

Explanation of symbols

  200 Electric supercharger, 202 Compressor housing, 204 Turbine housing, 206 Compressor wheel, 208 Turbine wheel, 210 shaft, 216 Rotating electric machine, 1210 Rotor, 1211 Rotor core, 1212 Permanent magnet, 1300 Stator, 1310 Stator core, 1311 Teeth section, 1312 Slot part, 1313 tip, 1320 coil, 1330 mold member, 1351 bus bar, 1400 holder, 1409 convex part, 1410 Hall element.

Claims (1)

A stator provided on the outer peripheral side of the rotor and having a plurality of teeth extending in the radial direction;
A magnetic flux detection element installed between the teeth,
A holder for holding the magnetic flux detection element,
The outer peripheral surface of the holder is in contact with the tip of the teeth portion, the inner peripheral surface of the holder faces the rotor,
The magnetic flux detection element fixing structure, wherein the magnetic flux detection element is disposed at a position offset from a central position between the teeth portions in a rotation direction of the rotor.

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