JP2001359263A - Synchronous machine serving both as magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchronous machine which serves both as a magnet, that allows the factor of electromagnetic steel plate utilization to be enhanced, without degrading the capability to prevent excessive increase in generated voltage. SOLUTION: A rotor core 1210 is formed, by spirally wrapping and laminating band-shaped soft magnetic long plates in the axial direction. As a result, electromagnetic steel plates, normally employed for rotor cores, can be saved to reduce the quantities of used materials. Moreover, a magnetic pin (magnetically short- circuiting member) 1281, made of soft magnetic material penetrating the spirally wrapped soft magnetic long plates, forms a magnetic path short-circuiting the rotor core 1210 in the axial direction and further provides a function of binding the spirally wrapped soft magnetic long plates to prevent the plates from coming apart in the circumferential direction or axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a synchronous machine with a magnet.

[0002]

2. Description of the Related Art A permanent magnet type synchronous machine has a high output and is easy to be compact in comparison with other types of synchronous machines, and is suitable for a magnet combined synchronous machine for a vehicle running motor of a hybrid vehicle or an electric vehicle.

However, a synchronous machine with a magnet for a vehicle running motor ensures a sufficient low-speed torque and prevents an excessive armature winding induced voltage from being applied to a semiconductor drive element of a drive circuit during high-speed rotation. Therefore, it is necessary to provide means for reducing the magnet magnetic field during high-speed rotation.

JP-A-10-304 filed by the present applicant
No. 633 discloses a rotor core provided with a permanent magnet, a short-circuit member for magnetically short-circuiting the permanent magnet poles, and a field coil for controlling the amount of magnetic flux of the short-circuit member. A magnet-combined synchronous machine has been proposed in which the reluctance of a magnetic circuit is adjusted, thereby controlling the effective magnetic field that is effectively linked to the armature winding to adjust the generated voltage of the armature winding.

[0005]

However, the above-described synchronous machine with magnets has a problem in that the inner peripheral side of the rotor core made of laminated magnetic steel sheets is cut out to accommodate the field coil.
The utilization rate of expensive electromagnetic steel sheets was poor, and the practicality was reduced due to the increase in material costs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a synchronous machine with a magnet capable of improving the utilization rate of an electromagnetic steel sheet without deteriorating the generation voltage excessive rise suppression performance. I have.

[0007]

According to the synchronous machine with magnets of the first aspect, the rotor core is formed by spirally winding a band-shaped soft magnetic plate and laminating in the axial direction. The amount of material used can be reduced by saving the electromagnetic steel sheet used as a material.

Further, the magnetic short-circuit member penetrating the helically wound soft magnetic plate in the axial direction constitutes a magnetic path for magnetically short-circuiting the rotor core in the axial direction, and the helically wound soft magnetic plate is formed in the circumferential direction or the axial direction. The function of fastening so as not to disperse in the direction can be achieved, and a special pin member for fixing the spirally wound rotor core can be omitted.

According to a second aspect of the present invention, in the synchronous machine with a magnet according to the first aspect, a slit is formed in the rotor core for communicating the through hole for accommodating the short-circuit member and the inner peripheral surface of the rotor core.

[0010] According to this configuration, the through hole for accommodating the short-circuit member and the slit facilitate the plastic deformation of the soft magnetic plate for forming the rotor core, thereby facilitating the manufacture of the rotor core.

According to a third aspect of the present invention, in the synchronous machine with magnets according to the first or second aspect, the rotor core further comprises a through hole for magnet accommodation penetrating in the axial direction, and the through hole for magnet accommodation. And a slit communicating with the inner circumferential surface of the rotor core, the through hole for magnet accommodating the slit facilitates plastic deformation of the soft magnetic plate for forming the rotor core, thereby facilitating the manufacture of the rotor core.

According to a fourth aspect of the present invention, in the combined magnet synchronous machine according to any one of the first to third aspects, the magnet containing through-hole has a rectangular cross-sectional shape in which a pair of sides extend substantially in a radial direction. Wherein the magnetic pole faces of the permanent magnet are formed on both end faces in the circumferential direction, and two permanent magnets adjacent to each other in the circumferential direction are magnetized in opposite directions.

According to this structure, since the magnet-receiving through-hole has a rectangular cross section, plastic deformation of the soft magnetic plate is facilitated and magnet flux can be increased.

According to the fifth aspect, the first to fourth aspects are provided.
Further, in the synchronous machine with magnet according to any one of the above, the outer peripheral surface of the rotor core is located at a radially outer portion of the magnet insertion hole and is recessed radially inward, and is adjacent to the soft magnetic plate in the laminating direction. It is characterized in that it has a connection portion where the thin plate portions are welded to each other, so that leakage of magnet magnetic flux can be reduced and the strength of the rotor core can be enhanced.

In particular, since the rotor core is recessed radially inward at the connection portion, the swelling due to the welding can be absorbed, and magnetic leakage to the stator core through the connection portion can be reduced. The magnetic properties of the connecting portion are degraded by welding heat, and the magnetic flux leakage magnet passing circumferentially through the connecting portion can be reduced.

According to a sixth aspect of the present invention, in the synchronous machine with magnets according to any one of the first to fifth aspects, further, an inner peripheral portion of the rotor core is located on both sides of the field coil to form the magnetic member. A magnetic protrusion protruding radially inward toward the outer peripheral surface of the rotor core; and a magnetic recess having a magnetic resistance between the field yoke and the magnetic protrusion larger than the magnetic protrusion. , And the one end in the axial direction of the rotor core has the magnetic protrusions and the magnetic recesses at circumferentially opposite positions with respect to the other end.

According to this structure, it is possible to prevent the current magnetic flux formed by the field coil from flowing in the rotor core in the axial direction independently of the magnetic path of the magnet magnetic flux, thereby preventing the effect of controlling the magnetic magnetic flux from being reduced. .

According to a seventh aspect of the present invention, in the synchronous machine with the magnet according to the sixth aspect, the through hole for accommodating the magnet has a long side having a predetermined inclination angle of less than 45 degrees with respect to the radial direction. The inclination angle of two adjacent permanent magnets having a radial cross section is such that the magnetic protrusions of the rotor core are wider than the magnetic recesses and are formed in opposite directions with respect to the radial direction.

According to an eighth aspect of the present invention, in the synchronous machine with magnets according to any one of the first to seventh aspects, the magnetic member is fixed to an inner end wall of the housing and an outer peripheral surface of the rotor core is fixed to the rotor core. Are characterized by having a field yoke facing the inner peripheral surface thereof with a predetermined gap therebetween.

Thus, the rotating mass can be reduced to improve the acceleration, and the power supply path to the field coil can be simplified.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to examples.

[0022]

Embodiment 1 The synchronous machine with a magnet described in Embodiment 1 is shown in FIGS.
This will be described with reference to FIG. (Description of Overall Structure) The rotating machine 1000 includes a stator 110
0 and a rotor 1200, and the stator 1100 is fixed to the inner peripheral surfaces of the front frame 1910 and the end frame 1911.

The rotor 1200 has bearings 1920 and 19
The outer peripheral surface faces the inner peripheral surface of the stator 1100 via an air gap. Reference numeral 1930 denotes a resolver rotor for measuring the rotational position of the rotor 1200, and reference numeral 1931 denotes a resolver stator.

The stator 1100 has a three-phase coil 111 on a stator core 1120 formed by laminating electromagnetic steel sheets in the axial direction.
0, the stator core 1120 includes a slot 1121 for inserting the three-phase coil 1110, and the teeth 11
22 and a core back 1123.

The rotor 1200 has a rotor core 1210 made of an electromagnetic steel plate and a rotor yoke 1270 made of a soft magnetic iron core.

The rotor core 1210 is formed in a cylindrical shape by spirally winding electromagnetic thin steel sheets and laminating them in the axial direction as shown in FIG. 2 (a sectional view taken along the line EE in FIG. 1). . The rotor core 1210 has a square magnet insertion hole (magnet accommodation through hole) 1211 penetrating in the axial direction at an equal pitch in the circumferential direction and an axial penetration between two adjacent magnet insertion holes 1211. Round holes (through holes for accommodating short-circuit members) 1212. Rotor core 12
In the inner peripheral portion of the magnetic pole 10, a magnetic projection 1250 through which a magnetic flux from a field yoke 1232 described later easily passes and a magnetic recess 1251 through which a magnetic flux hard to pass are alternately formed at every magnetic pole pitch. A part is formed. Magnetic protrusion 12
50 has a slit 1252 formed in the radial direction and communicating the round hole 1212 and the inner peripheral surface of the rotor core 1210.

FIG. 8 shows the unfolded shape of the rotor core 1210, that is, the shape of the long strip-shaped electromagnetic steel sheet before the spiral winding. Rotor core 121 in an unfolded state (before spiral winding)
In FIG. 0, a magnet insertion hole 1211, a round hole 1212, and a slit 1252 are formed by press punching. The magnet insertion holes 1211, the round holes 1212, and the slits 1252 are formed so as to be aligned in the axial direction after winding.

A magnet 1280 is inserted into the magnet insertion hole 1211.
A magnetic pin (magnetic short-circuit member) 1281 made of a soft magnetic material is press-fitted (or fitted) into the round hole 1212. The magnetic pin 1281 prevents the spirally wound long strip-shaped electromagnetic steel plate from returning in the circumferential direction and dispersing in the axial direction.

The slit 1252 of the rotor core 1210 before the spiral winding, that is, the long strip-shaped electromagnetic steel plate has a shape in which the slit width becomes wider toward the inner periphery, whereby the slit 1252 after the spiral winding is formed. The slit width is very small in each part. Thereby, the magnetic resistance of rotor core 1210 with respect to the field magnetic flux can be reduced. By forming the slit 1252,
Spiral winding of the long strip-shaped electromagnetic steel plate is easy,
In this embodiment, since the slit 1252 is provided at the position of the round hole 1212, the round hole 1212
Can also substantially function as a slit,
The spiral winding of the long strip-shaped electromagnetic steel plate can be further facilitated.

The magnetic projection 1250 is provided adjacent to the inner circumference of every other round hole 1212 in the circumferential direction and between the two magnet insertion holes 1211 on both sides in the circumferential direction. Is provided between two magnet insertion holes 1211 on both sides in the circumferential direction, adjacent to the inner peripheral side of the round hole 1212.

In this embodiment, the slit 1252 is provided in the magnetic projection 1250, thereby facilitating plastic deformation for the spiral winding of the magnetic projection 1250. Of course, the slit 12
52 may be provided. Further, as shown in FIG. 1, the magnetic protrusion 1250 and the magnetic recess 1251 are
The position is reversed between the first half of the axial direction 210 and the second half of the axial direction.

The magnet 1280 inserted in each magnet insertion hole 1211 in the axial direction is magnetized in its thickness direction, that is, substantially in the axial direction, and two magnets 1280 adjacent in the circumferential direction are magnetized.
In the above, the end faces facing each other are magnetic pole faces having the same polarity.

The magnetic pin (soft magnetic pin) 1281 has a flange at the base end that is larger in diameter than the round hole 1212, and after press-fitting, pushes the distal end member of the soft magnetic pin 1281 and spirally winds it. The rotor core 1210 made of the long strip-shaped electromagnetic steel plate is fixed in the axial direction. Further, every other magnetic pin 1281 fixes the rotor core 1210 to the rotor yoke 1270.

The rotor core 1210 has a recess formed between the outer peripheral surface and the outer end of the magnet insertion hole 1211 as shown in FIG. It is formed in the axial direction along the insertion hole 1211. The recessed portion is formed between the outer peripheral surface of the magnet 1280 and the stator core 1120.
A large gap is secured between the inner surface of the magnet 128 and the magnet 128.
It is suppressed that the magnetic flux of 0 does not sufficiently interlink with the armature winding 1110 and becomes a leakage magnetic flux. The recessed portion is formed between the outer peripheral surface of the rotor core 1210 and the magnet insertion hole 121.
The circumferential magnetic path of the rotor core 1210 between the outer peripheral end of the rotor core 1210 and the outer end of the rotor core 12 is narrowed to reduce the leakage magnetic flux of the magnet 1280. Furthermore, this recessed portion is laser-welded in the axial direction from the outer peripheral surface side of the rotor core 1210, whereby the layers of the long strip-shaped electromagnetic steel sheet that is spirally wound and constitute the rotor core 1210 are integrated. At the same time, the magnetic properties of the recessed portion are degraded to reduce the leakage magnetic flux flowing in this portion in the circumferential direction.

The rotor yoke 1270 is formed by forging a soft magnetic iron core as shown in FIG. 1 and FIG. 3, which is a cross-sectional view taken along the line P in FIG. The rotor yoke 1270 is
A flange member comprising a radially extending disk portion 1271 and a boss 1272 extending rearward from the inner peripheral end of the disk portion 1271, wherein the disk portion 1271 is
A half of the number of ribs 1273 of the magnet insertion hole 1211 radially outwardly protruding from the outer peripheral edge of the outer periphery 71 is provided. The rib 1273 has a round hole 1278 formed with the same diameter at the same position as the round hole 1212 (see FIG. 2) at the rear half of the rotor yoke 1270 in the axial direction. Rotor yoke 1
The soft magnetic pin (magnetic pin) 1281 penetrating through the round hole 1212 of the 270 is press-fitted into the round hole 1278 of the rib 1273, whereby the rotor core 1210 is connected to the rotor yoke 1.
270. 1240 is a spline 124
The shaft 1 is press-fitted into the boss 1272 so as not to rotate relatively.

Reference numeral 1274 denotes a flange-shaped field core (stationary yoke) made of a soft magnetic material, and its disk portion is fixed to an end wall of the end frame 1911 by screws 1940. The inner peripheral surface of the boss portion of the field core 1274 is relatively rotatably fitted to the outer peripheral surface of the boss portion 1272 of the rotor yoke 1270 with a small gap therebetween.
It protrudes in the axial direction into the space existing inside the diameter of 10.
A field winding 1230 is wound around the outer peripheral surface of the boss portion of the field core 1274. On both sides of the field winding 1230 in the axial direction, a field magnetic flux is guided to the inner peripheral surface of the rotor core 1210. A field yoke 1232 made of laminated electromagnetic steel sheets is fitted by press fitting.

The reference numeral 1350 designates a field winding 12 from the outside.
A lead 1350 for supplying power to the power supply 30.

Three-phase coil 1110 of rotating electric machine 1000
Are supplied from a battery 300 through a direct-to-alternating power converter (inverter) 200. Field coil 1230
Is supplied from the field current control circuit 400 through the lead wire 1350 to the resolver stator 1.
931 outputs the signal to the signal processing circuit 500,
0, the field current control circuit 400 and the signal processing circuit 500 are controlled by the control circuit 600. (Description of Magnetic Circuit) Next, the magnet magnetic field formed by the magnet 1280 and the current magnetic field formed by the current of the field coil 1230 will be described below. What is particularly important is that, as described above, the magnetic protrusion 1250 in the first half in the axial direction of the rotor core 1210 and the magnetic protrusion 1250 in the second half in the axial direction are shifted by one magnetic pole pitch in the circumferential direction. .

Magnet 1 magnetized in thickness direction (substantially circumferential direction)
280 are alternately arranged on the outer peripheral surface of the rotor core 1210 in the circumferential direction.
A magnetic pole and an N magnetic pole are formed. The magnetic flux from the S magnetic pole is
The armature winding 1110 is linked in the stator core 1120 through an air gap between the armature winding 1110 and the stator core 1120,
The effective magnetic flux returns to the rotor core 1210 through the air gap.

The magnetic flux from the S magnetic pole of the magnet 1280 is applied to the soft magnetic pin 1281 of the S magnetic pole portion of the rotor core 1210, the rib portion 1273 of the rotor yoke 1270,
The magnet 1280 passes through the disk portion 1271, the boss portion 1272, the boss portion of the field core 1274, the field yoke 1232, the magnetic convex portion 1250 at the rear half in the axial direction of the rotor core 1210, and the N magnetic pole side soft magnetic material pin 1281. Return to the N pole, thereby forming a short circuit magnetic circuit.

The magnetic flux from the S magnetic pole of the magnet 1280 is applied to the soft magnetic pin 1281 of the S magnetic pole portion of the rotor core 1210, the magnetic protrusion 1250 in the first half of the rotor core 1210 in the axial direction, and the field yoke 1232 (the shaft). Direction front),
It returns to the N magnetic pole of the magnet 1280 through the boss portion of the field core 1274, the field yoke 1232 (the rear portion in the axial direction), the magnetic convex portion 1250 in the rear half portion of the rotor core 1210 in the axial direction, and the soft magnetic pin 1281 on the N magnetic pole side. Thus, a short-circuit magnetic circuit substantially parallel to the short-circuit magnetic circuit is formed.

Of course, the armature winding 11 of the stator 1100
The effective magnetic flux linked to 10 is reduced by the amount of the magnetic flux flowing through the short-circuit magnetic circuit.

The two short-circuit magnetic circuits include a field coil 123
Since the magnetic flux is linked to zero, the amount of magnetic flux from the magnet magnetic field to the short-circuit magnetic circuit can be controlled by the current flowing through the field coil 1230.

FIG. 4 shows an equivalent magnetic circuit of the rotating electric machine.

The magnetic resistance of the stator 1100 is Rs, the magnetic resistance of the air gap is Rg, and the magnetic resistance of the magnet is Rm.
And Rm is a magnetic resistance on the rotor side of the magnetic circuit through which the effective magnetic flux flows. When the magnetic resistance (short-circuit magnetic resistance) excluding Rm among the magnetic resistances of the short-circuit magnetic circuit is Rr, the magnetomotive force of the magnet is Fm, and the magnetomotive force of the field winding is Fc,
The effective magnetic flux amount Φ1 flowing on the stator 1100 side can be expressed by the following equation.

Φ1 = (RmFc + RrFm) / (RrR
m + Rm (Rg + Rs) + (Rg + Rs) Rr) Φ2 is a short-circuit magnetic flux amount. The effective magnetic flux amount Φ1 can be set arbitrarily by setting each parameter. For example, the field winding 12
Effective flux amount Φ when no current flows through Fc = 0 (Fc = 0)
10 is: Φ10 = RrFm / (RrRm + Rm (Rg + Rs) +
(Rg + Rs) Rr) When the short-circuit magnetic resistance Rr is small, Φ10 is almost 0.
Becomes The short-circuited magnetic resistance Rr is expressed by a soft magnetic material pin 1281,
The magnetic flux is determined by the magnetic resistance of the rib 1223, the cylindrical iron core 1231, and the joint of each member. Therefore, by setting the cross-sectional area and length of each part, the effective magnetic flux when no current flows through the field winding 1230 The quantity Φ10 can be set. Here, the BH characteristic of the magnetic material constituting the magnetic path through which the effective magnetic flux flows is set to a linear region (range of 0 to Φ 'shown in FIG. 5), and the effective magnetic flux amount Φ1 is set to the magnetic material constituting the magnetic path. Not reach the magnetic saturation region.

When current is supplied to the field winding 1230, a magnetic flux amount Φ1c corresponding to the field winding magnetomotive force Fc is formed.

Φ1c = RmFc / (RrRm + Rm (R
g + Rs) + (Rs + Rs) Rr) As a result, the effective magnetic flux amount Φ1 becomes Φ1 = Φ10 + Φ1c, and the effective magnetic flux amount can be adjusted by the field winding current. The magnetic flux amount Φ1c can be considered to reduce the magnetic flux amount leaking to the short-circuit magnetic circuit.

(Effects of the Embodiment) The synchronous machine with a magnet described above is particularly suitable as a running motor for a hybrid vehicle or an electric vehicle.

This kind of running motor is used in a wide rotation speed range according to the wheel rotation speed. In a low rotation range where the field weakening control is not required, the current flowing through the field winding 1230 is increased to increase the effective magnetic flux amount Φ1. Since the motor generated torque is proportional to the effective magnetic flux amount Φ1 and the torque current, the armature current flowing through the armature winding 1110 can be reduced by increasing the effective magnetic flux amount Φ1.

Since the reaction induced voltage exceeds the applied voltage,
In the high rotation range where the field weakening control is necessary for driving the motor, the current flowing through the field winding 1230 is set to zero, the magnet flux is shunted to the short-circuit magnetic path to the maximum, and the field weakening current flowing to the armature winding is reduced. Can be reduced or zero. As a result, the maximum armature current can be reduced, so that the heat generation of the winding part is suppressed, the rotating machine can be downsized, and the power converter 200
Semiconductor switching element can be downsized.

Since the copper loss of the field coil 1230 is slightly smaller than the copper loss of the armature winding 1110, the field weakening caused by the field current described in this embodiment is smaller than that caused by the conventional armature current. This leads to an increase in efficiency.

When the field winding magnetomotive force Fc = 0, the effective magnetic flux amount Φ10 is determined by the BH of the magnetic material constituting the effective magnetic path.
Since it is set in the linear region of the characteristic, the effective magnetic flux amount Φ10
When it is necessary to drive the motor in a high rotation range where the reaction induced voltage due to is higher than the applied voltage, the armature winding 1110
The armature current required for the field weakening can be minimized.

Referring to FIG. 5, when the effective magnetic flux is reduced from Φo to Φ ′ by the armature current, the required AT is ATa when the BH curve is linear, and the required AT is ATb when the BH curve is nonlinear. Then, ATa <ATb, so that the armature current can be reduced in proportion to the difference.

Further, an efficiency map on the TN (torque-rotational speed) characteristic when the conventional permanent magnet rotary electric machine is operated as a motor and a field weakening current is applied to the armature winding for control is shown. FIG. 6 shows an efficiency map on TN characteristics when the rotating electric machine of this embodiment is driven by the above control method.
Shown in As can be seen from the comparison between the two figures, the maximum efficiency range on the efficiency map is expanded.

When the rotating electric machine of this embodiment is operated as a generator, it is necessary to set Φ10 to the level of a normal load for a vehicle, and to energize the field winding only when a higher output is required. In addition, the copper loss of the field winding can be reduced, and high-efficiency power generation is possible.

In addition, conventionally, there are salient pole type synchronous machines and claw ball type synchronous machines as synchronous rotary machines which can control the field from the rotor, and both of them use a field winding only to generate an effective magnetic flux. As compared with the rotating electric machine of this embodiment, which can compensate for the necessary minimum of the effective magnetic flux (elimination of short-circuit magnetic flux) by the field winding, the current flowing through the field winding is large. There are problems that the size of the magnetic coil is increased and that the field coil has a large resistance loss. Since the field coil of the rotor winding is inferior to the armature winding in cooling performance, the use of this embodiment can reduce the loss and heat generation of the field coil.

[0058]

Embodiment 2 Another embodiment of the synchronous machine with a magnet according to the present invention will be described with reference to FIG.

In the synchronous machine with a magnet according to this embodiment, the magnet insertion hole 1211 also has a slit 1253 communicating with the inner peripheral surface of the rotor core 1210. Further, a second hole (a round hole 1 of the first embodiment) into which a prismatic magnetic pin (not shown) is fitted.
(Corresponding to 212) 1214 also has openings 1254 and 1255 that communicate with the inner peripheral surface of rotor core 1210. Holes 1211, 1214 and openings 1253, 125
4, 1255, the opening width is increased toward the inner peripheral surface when the core is developed (before the spiral winding), which is the same as the slit of the first embodiment. When the rotor core 1210 is spirally wound, the opening width of the opening 1254 located at the above-described magnetic projection is narrowed, and the opening width of the opening 1255 located at the above-described magnetic recess is widened. Reference numeral 1261 denotes an opening 125 for preventing the magnet from detaching inward.
Reference numeral 3 denotes a protrusion projecting in the circumferential direction. Reference numerals 1262 denote hook portions provided on both sides of the wide opening portion 1255. The hook portions 1262 abut against a not-shown prismatic magnetic pin 1281 to prevent the rotor core 1210 from being displaced or eccentric radially outward. I have. Thus, by making the magnetic pin into a prismatic shape, the magnetic path cross-sectional area of the magnetic pin can be increased, its magnetic resistance can be reduced, and the amount of magnetic flux of the field coil can be increased. In addition, the magnetic pin is
The portion fitted into the rotor yoke 1270 may have a prismatic shape, and the portion fitted into the rotor yoke 1270 may have a cylindrical shape. In addition, as shown in FIG. 9, by providing openings 1253 and 1254 communicating with the magnet insertion hole 1211 and the magnetic pin insertion hole 1214 on the inner peripheral surface of the rotor core 1210, mounting of the magnet and the magnetic pin is facilitated. . Also, the openings 1253, 12
By providing 54, it is possible to alleviate the residual stress caused by plastic deformation press-fitting of the magnetic steel sheet and improve the magnetic properties.

[0060]

Embodiment 3 Another embodiment of the present invention will be described with reference to FIG.

The synchronous machine with a magnet according to this embodiment is characterized in that the long side of the magnet insertion hole 1211 of the rotor core 1210 has a predetermined inclination angle with respect to a normal extending radially from the axis of the rotor core 1210. And

The electromagnetic steel sheet constituting the rotor core 1210 has a long strip shape, and the long side direction of the magnet insertion hole 1211 has an inclination angle θ with respect to a normal line radially extending from the axis of the rotor core 1210. It has an opening 1253 that communicates with the inner peripheral surface of the rotor core 1210. Further, a second hole (corresponding to a round hole in Example 1) 1212 into which the magnetic pin 1281 is press-fitted also has an opening 1252 communicating with the inner peripheral surface of the rotor core 1210. Also, when the core is unfolded, the openings 1252 and 1253 are made wider toward the inner periphery so as to have a desired opening width when wound in an annular shape. Reference numeral 1261 denotes a protrusion for preventing the magnet from coming off in the inner circumferential direction.

In this embodiment, since the magnet is inclined as described above, the magnetic projection 1250 of the rotor is made wider than the magnetic recess 1251 to facilitate the passage of the magnetic flux from the field yoke 1232. Can be better concentrated on the pole face. Note that the magnet is provided in the magnet insertion hole 121.
1 may be magnetized after mounting, or may be magnetized before that, but the former improves productivity.

Further, since the magnet can be divided into the first half in the axial direction and the second half in the axial direction of the rotor core 1210, the circumferential pitch at a portion outside the diameter of the magnet insertion hole 1211 is adjusted to the first half in the axial direction. By making them different between the second half and the latter half, the spatial distribution waveform of the synthetic magnetic flux can be adjusted so that the torque ripple and the like become small.

In the embodiment described above, the field winding for controlling the effective magnetic flux is provided in the empty space inside the inner diameter of the embedded magnet type rotor, so that the efficiency is maximized in the entire rotation speed region of the rotating machine. Control becomes possible. Further, since the magnetic pole is made of a magnetic steel sheet spirally wound, it has excellent centrifugal force resistance and can reduce iron loss.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a synchronous machine with a magnet according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line EE of FIG. 1;

FIG. 3 is a side view of the rotor of FIG.

FIG. 4 is an equivalent magnetic circuit diagram of the synchronous machine of FIG. 1;

FIG. 5 is a BH characteristic diagram showing a relationship between a magnetic flux density and a magnetic field of a magnetic material used in the synchronous machine of FIG.

FIG. 6 is a characteristic diagram showing a relationship between torque and rotation speed of a conventional permanent magnet type synchronous machine.

FIG. 7 is a characteristic diagram showing a relationship between a torque and a rotation speed of the synchronous machine with a magnet of FIG. 1;

FIG. 8 is a diagram illustrating a rotor core shape according to the first embodiment;
(A) is a development view, (b) is a partial side view after spiral winding.

FIG. 9 is a diagram illustrating a rotor core shape according to the second embodiment;
(A) is a development view, (b) is a partial side view after spiral winding.

FIG. 10 is a diagram showing a rotor core shape according to a third embodiment;
(A) is a development view, (b) is a partial side view after spiral winding.

[Explanation of symbols]

 1000 rotating electric machine 1100 stator 1120 stator core 1200 rotor 1230 field winding 1211 magnet insertion hole (magnet accommodation through-hole) 1212 round hole (short-circuit member accommodation through-hole) 1270 rotor yoke (magnetic member) 1280 magnet (permanent magnet) 1281 soft Magnetic pin (magnetic short circuit member) 1910 Front frame (housing) 1911 End frame (housing) 1110 Armature winding 1232 Field yoke (magnetic member) 1274 Field core (magnetic member)

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) CA09 CB05 PP17

Claims (8)

[Claims] A stator; a stator core fixed to an inner peripheral surface of the housing; an armature winding wound on the stator core; A cylindrical rotor core rotatably supported, a permanent magnet fixed to the rotor core to form a field pole on the outer peripheral surface of the rotor core, and a magnet formed by the permanent magnet inserted axially through the rotor core A magnetic short-circuit member for magnetically short-circuiting a magnetic field; a field coil disposed radially inside the rotor core to flow a magnetic flux to the magnetic short-circuit member through the field yoke and the rotor core; and a magnetic coil disposed radially inside the rotor core. And a magnetic member that allows a magnetic flux formed by the field coil to flow through together with the rotor core and the magnetic short-circuit member. The rotor core is formed of a soft magnetic plate spirally wound and laminated in the axial direction, and is interposed between the outer peripheral surface of the field coil and the inner peripheral surface of the stator core. A synchronous machine with a magnet, wherein the synchronous machine is inserted into a through-hole for accommodating a short-circuit member that is provided in an axial direction. 2. The synchronous machine with magnet according to claim 1, wherein said rotor core has a slit communicating the through-hole for accommodating the short-circuit member and an inner peripheral surface of the rotor core. Machine. 3. The synchronous machine with magnets according to claim 1, wherein the rotor core includes a magnet housing through-hole provided in an axial direction, and the magnet housing through hole formed on an inner peripheral surface of the rotor core. And a slit communicating with the magnet. 4. The synchronous machine with magnet according to claim 1, wherein the through hole for accommodating a magnet has a rectangular cross-section having a pair of sides extending substantially in a radial direction of the rotor core. The magnet-combined synchronous machine is characterized in that the magnetic pole faces of the magnet are formed on both end faces in the circumferential direction, and the end faces of the two permanent magnets adjacent in the circumferential direction that face each other have the same polarity. . 5. The synchronous machine according to claim 1, wherein an outer peripheral surface of the rotor core is located at a radially outer portion of the magnet insertion hole and is recessed radially inward. A synchronous machine with a magnet, comprising: a connecting portion in which thin plate portions adjacent to each other in the laminating direction of the soft magnetic plates are welded to each other. 6. The synchronous machine according to claim 1, wherein the inner peripheral portion of the rotor core is located on both sides of the field coil and radially inward toward the outer peripheral surface of the magnetic member. And the magnetic core between the magnetic core and the field yoke alternately at a circumferential magnetic pole pitch of the rotor core. Wherein the one end in the axial direction has the magnetic protrusions and the magnetic recesses at circumferentially opposite positions with respect to the other end. 7. The synchronous machine according to claim 6, wherein the through holes for accommodating the magnet have a radial cross section having a long side having an inclination angle of less than 45 degrees with respect to the radial direction. The tilt angle of the two permanent magnets is such that the magnetic protrusions of the rotor core are wider than the magnetic recesses and are formed in opposite directions based on a radial direction. 8. The synchronous machine according to claim 1, wherein the magnetic member is fixed to an inner end wall of the housing, and an outer peripheral surface of the synchronous member has a predetermined gap in an inner peripheral surface of the rotor core. A synchronous machine with a magnet, comprising a field yoke facing away.