Rotor punching sheet capable of directly outputting available alternating current and permanent magnet generator

Abstract

The utility model relates to the field of permanent magnet generators, in particular to a rotor punching sheet capable of directly outputting available alternating current and a permanent magnet generator, and the rotor punching sheet is circumferentially provided with a plurality of slot units; each slot unit comprises two slots, and a V shape is formed between the two slots, that is, the two slots are close to each other at the inner end close to the center of the punching sheet and are unfolded to each other at the outer end close to the edge of the punching sheet; in each slot unit, a gap is formed between the inner ends of the two slots; in each slot unit, the number of the distance S between the outer ends of two slots is influenced by the diameter of a rotor punching sheet, the number of embedded permanent magnets and the like. In each slot unit, the V-shaped included angle between two slots meets the relation and is influenced by the number of the embedded permanent magnets and the like. The beneficial effects of the utility model are that not only can the strength be ensured, the weight be reduced, but also the efficiency can be improved, the waveform can be optimized, and the voltage regulation rate can be reduced, that is, high-quality electricity which can be directly used can be generated, so that a power generation system becomes simple, and the concealment of military engineering vehicles can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet generators, in particular to a rotor punching sheet and a permanent magnet generator which can directly output usable alternating current. Background Art

[0002] At present, there are some permanent magnet generators on the market (permanent magnet generators are different from permanent magnet motors. The latter only need to rotate, while the former must ensure high-quality electricity after generating electricity). Due to their very high cost, they are rarely used in civilian applications and are mainly used for military purposes.

[0003] However, even some permanent magnet generators used in the military do not perform well enough in terms of performance. They have many defects such as low efficiency, low power density, poor waveform, and large voltage regulation rate, and cannot meet military needs well.

[0004] Specifically, for example, military electricity is mostly used in the field, and an oil engine combined with a permanent magnet generator is used to generate electricity. The electricity generated is not high-quality electricity with a good waveform (not high-quality municipal electricity). This electricity cannot be used directly, and needs to be converted into high-quality electricity (converting unusable AC power into usable DC power or industrial frequency AC power) through a subsequent controller or converter (through the current injection method, vector control, such as controlling the size and direction of the current). The use of controllers or converters will generate electromagnetic noise; this makes the entire power generation more complicated, and it will also cause our side to be unable to receive signals well, and it also makes it easier for the other side to capture our noise signals-easy to be exposed.

[0005] Therefore, based on customer needs, our company has developed a new permanent magnet generator, which has made significant improvements on defects such as low efficiency, low power density, poor waveform, and large voltage regulation rate. For example, we strive to make the power generation system simple - it can be used directly by hanging it on the chassis of an engineering vehicle, without using a controller or converter, and the generated electricity can be used directly, which does not affect our signal reception and improves concealment. Summary of the invention

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a rotor punching and a permanent magnet generator that can directly output usable alternating current, thereby solving the problems of low efficiency, low power density, poor waveform, and large voltage regulation rate of the permanent magnet generator in the prior art. The utility model corrects the magnetic circuit of the rotor punching by arranging magnetic isolation holes and magnetic isolation grooves, thereby achieving the goals of ensuring strength and reducing weight, improving efficiency, optimizing waveform, and reducing voltage regulation rate, so that the output alternating current can be used directly.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] (First aspect)A rotor punching sheet capable of directly outputting available alternating current, wherein a plurality of slot units are circumferentially provided on the rotor punching sheet;

[0009] Each of the slot units includes two slots, and a V-shaped structure is formed between the two slots, that is, the two slots approach each other at the inner ends close to the center of the punching sheet and expand from each other at the outer ends close to the edge of the punching sheet; in each of the slot units, there is a gap between the inner ends of the two slots;

[0010] In each of the slot units, the distance S between the outer ends of the two slots satisfies the relationship: ;

[0011] wherein, π is the ratio of the circumference of a circle to its diameter, π = 3.14159; D is the circumferential diameter of the rotor punching sheet; K2 is a defined coefficient, 0.85 < K2 < 1.65; m is the number of slots for inlaying permanent magnets on the entire punching sheet rotor, that is, the total number of all slots on the entire rotor punching sheet, m = 2, 4, 6, 8, 10, 12, 24, 36;

[0012] In each of the slot units, the V-shaped angle between the two slots satisfies the relationship: ;

[0013] wherein, K1 is a defined coefficient, 0.9 < K1 < 1.85; A represents the circumferential angle, A = 360 °.

[0014] As a preferred technical solution of the present application, in each of the slot units, the two slots are symmetric about the center line M, and the center line M is a radius of the rotor punching sheet; on the center line M, a magnetic isolation hole A is provided at the inner side close to the inner ends of the two slots, and a magnetic isolation hole B is provided at the outer side close to the inner ends of the two slots; the magnetic isolation hole A has a rectangular hole portion, and the rectangular hole portion points to the magnetic isolation hole B, forming an inner-end magnetic isolation structure.

[0015] As a preferred technical solution of the present application, in each of the slot units, the side corresponding to the inner end of the slot includes a straight line segment A and an arc segment B; the straight line segments A respectively corresponding to the two slots in one slot unit are symmetric about the center line M, and the arc segments B respectively corresponding to the two slots in one slot unit are minor arc segments with the magnetic isolation hole A as the center of the circle; in one slot, the straight line segment A and the arc segment B form a limiting structure at the inner end of the slot and also form an auxiliary demagnetization structure at the inner end.

[0016] As a preferred technical solution of the present application, on the center line M, a magnetic isolation hole C is provided at the middle position from the inner end of the slot to the edge of the rotor punching sheet, forming a middle magnetic isolation structure.

[0017] As a preferred technical solution of the present application, between two adjacent slot units, two adjacent slots are symmetrical about a center line N, and the center line is another radius of the rotor punching; on the center line N, a magnetic isolation hole D is opened on the inner side of the outer end of the adjacent slot between the two adjacent slot units, a magnetic isolation groove E is opened on the outer side of the outer end of the adjacent slot between the adjacent slot units, and magnetic isolation holes F are opened on the left and right sides of the outer end of the adjacent slot between the adjacent slot units, respectively, to form an outer end magnetic isolation structure.

[0018] As a preferred technical solution of the present application, the slot is in the shape of a long rectangle, and the edges at its outer end include a straight line segment E, a straight line segment F, and an arc segment G connected in sequence; the arc segment G is an arc segment concentric with the rotor punching sheet, one end of which is connected to a corner point at the outer end of the slot, and the other end of which is connected to another corner point at the outer end of the slot via the straight line segment E and the straight line segment F; the connection between the straight line segment E and the straight line segment F forms a sharp corner of the adjacent slot pointing to the adjacent slot unit; the connection between the straight line segment E and the straight line segment F forms a notch of the adjacent slot facing away from the adjacent slot unit; the entire straight line segment E, the straight line segment F, and the arc segment G form a structure for limiting the outer end, and also form an auxiliary demagnetization structure at the outer end.

[0019] As a preferred technical solution of the present application, the diameter of the rotor punching sheet is 80mm~300mm, the gap spacing between the inner ends of two slots in the slot unit is 2.5mm~5mm; the length of the slot is 40mm~45mm, and the width of the slot is 7mm~10mm.

[0020] As a preferred technical solution of the present application, the length of the straight line segment A is 4 mm to 4.5 mm.

[0021] As a preferred technical solution of the present application, the distance between the arc segment G and the edge of the rotor punching is 1.5mm~2.5mm, and the distance between the sharp corner and the corresponding magnetic isolation groove E is 2.5mm~3mm; the spacing between the relative sharp corners in adjacent slots of two adjacent slot units is 7.5mm~8.5mm; the spacing between the sharp corner and the corresponding magnetic isolation hole D is 1.5mm~3mm.

[0022] (Second aspect) A permanent magnet generator includes a stator and a rotor having rotor punchings, wherein the rotor punchings are rotor punchings of the above structure, and can directly output usable alternating current.

[0023] The utility model has the following advantages

[0024] (1) The electrical waveform emitted is good and can be used directly;

[0025] In existing generators, the electricity generated needs to be regulated by excitation control before it can be used (if it is used directly, the waveform is poor and cannot drive the corresponding mechanical structure to move well. For example, if it is used in an electric motor, the waveform of the electricity obtained by the motor is poor, and its output shaft cannot rotate smoothly);

[0026] In the utility model, the rotor punching sheet is structurally designed and then used in a permanent magnet generator. The waveform of the electricity generated by the generator is good and can be used directly without the need for excitation control and adjustment. This simplifies the entire power system, making it difficult for the enemy to capture our noise signal and facilitating the reduction of interference when we receive the signal.

[0027] (2) High power density;

[0028] In existing generators, when the excitation control is not regulated, the waveform of the output electricity is poor, so the electricity cannot be fully utilized (for example, when the generated electricity is used to drive the motor to rotate, if the waveform of the electricity is poor, it cannot generate an electromagnetic field that meets the requirements in the motor, so it cannot drive the output shaft of the motor to rotate well). When an excitation control unit is added, the volume and mass will increase greatly, resulting in low output power (low power density);

[0029] In the utility model, the waveform of the electricity generated is good, and it can be fully utilized by direct use, without the need for an excitation control circuit (i.e., an excitation control unit), and after the magnetic circuit is optimized, the power density of the utility model is improved (the output power is large);

[0030] (3) In the case of small size, it can run more smoothly;

[0031] It should be noted that the voltage regulation rate (i.e. steady-state voltage regulation rate and transient voltage regulation rate) of most existing generators is difficult to meet the requirements of the national military standard (it can still meet the requirements at low speeds, but the performance will seriously decline at high speeds, for example, the steady-state distortion rate may change from 4% to 6%~8%). At present, very few companies can meet the requirements of the national military standard (50HZ, m=4, 1500 rpm), but the method adopted is to increase the size of the rotor (if only a small voltage regulation rate is required, the number of poles in the generator can also be increased, but the parameters of the national military standard make it impossible to adopt this method);

[0032] The utility model has an excellent waveform of electricity generated, and both transient voltage regulation rate and steady-state voltage regulation rate are greatly improved, high-order harmonics are optimized, and noise is reduced accordingly, so that the generator and corresponding equipment can run more smoothly when loaded; therefore, without increasing the size of the rotor (in the case of small size), the requirements of the national military standard are still met. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the rotor punching sheet in the utility model;

[0034] Figure 2 It is a schematic diagram of the structure of the slot unit and the inner end of the slot;

[0035] Figure 3 It is a dimensional drawing of the slot unit and the inner end of the slot;

[0036] Figure 4 It is a schematic diagram of the structure of adjacent slots and outer ends of the slots in the adjacent slot unit;

[0037] Figure 5 is a schematic diagram of the structure of the slot;

[0038] Figure 6 is the front view of the rotor;

[0039] Figure 7 is an isometric view of the rotor;

[0040] Figure 8 is an isometric view of a permanent magnet generator;

[0041] Fig. 9 This is a curve diagram of the air gap magnetic field intensity when the utility model generator is unloaded;

[0042] Fig.10 for Fig. 9 A partial enlarged view of the

[0043] Fig.11 This is a torque fluctuation curve diagram of the utility model generator when it is loaded;

[0044] Fig.12 for Fig.11 A partial enlarged view of

[0045] In the figure: 1-slot unit, 2-slot;

[0046] 3-1-magnetic isolation hole A, 3-1-1-rectangular hole portion, 3-2-magnetic isolation hole B;

[0047] 4-1-magnetic isolation hole C;

[0048] 5-1-magnetic isolation hole D, 5-2-magnetic isolation groove E, 5-3-magnetic isolation hole F;

[0049] 6-1-straight line segment A, 6-2-arc segment B;

[0050] 7-1-straight segment E, 7-2-straight segment F, 7-3-arc segment G, 7-4-pointer, 7-5-notch;

[0051] 8-Weight reduction holes. Detailed implementation manners

[0052] The following further describes the present utility model in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following description.

[0053] It should be noted that the orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the utility model product is normally placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0054] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0055] As Figure 1~Figure 5 shown, on the one hand, a rotor punching sheet capable of directly outputting available alternating current is disclosed. A shaft hole is provided at the center of the rotor punching sheet, and a plurality of slot units 1 are provided in the circumferential direction of the rotor punching sheet;

[0056] Among them, the slot unit 1 includes two slots 2, and a V-shaped shape is formed between the two slots 2, that is, the two slots 2 approach each other at the inner end close to the center of the punching sheet and expand from each other at the outer end close to the edge of the punching sheet; and, in the slot unit 1, there is a gap between the inner ends of the two slots 2;

[0057] In the slot unit, the distance S between the outer ends of the two slots 2 satisfies the relationship: ;

[0058] Among them, π is the pi, π = 3.14159; D is the circumferential diameter of the rotor punching sheet; K2 is a defined coefficient, 0.85 < K2 < 1.65; m is the number of slots for inlaying permanent magnets on the entire punching sheet rotor, that is, the number of all slots on the entire rotor punching sheet, m = 2, 4, 6, 8, 10, 12, 24, 36;

[0059] In the slot unit 1, the V-shaped angle between the two slots 2 satisfies the relationship: ;

[0060] Among them, K1 is a defined coefficient, 0.9 < k1 < 1.85; A represents the circumferential angle, A = 360 °.

[0061] It should be noted that the slot 2 is in a long rectangular shape.

[0062] Refer to Figure 2In order to correct the magnetic circuit, a design is made at the inner end of the slot 2 to form an inner end magnetic isolation structure. Specifically, it is stipulated that in the slot unit 1, the two slots 2 are symmetrical about the center line M, and the center line M is a radius of the rotor punching. On the center line M, a magnetic isolation hole A3-1 is opened at the inner side of the inner ends of the two slots 2, and a magnetic isolation hole B3-2 is opened at the outer side of the inner ends of the two slots 2; the magnetic isolation hole A3-1 has a rectangular hole portion 3-1-1, and the rectangular hole portion 3-1-1 points to the magnetic isolation hole B3-2, forming an inner end magnetic isolation structure.

[0063] See also Figure 2 , Figure 4 In order to correct the magnetic circuit, a middle magnetic isolation structure is also designed. Specifically, on the center line M, a magnetic isolation hole C4-1 is opened at the middle position from the inner end of the slot 2 to the edge of the rotor punching to form a middle magnetic isolation structure.

[0064] See also Figure 4 In order to correct the magnetic circuit, the outer end of the slot 2 is designed to form an outer end magnetic isolation structure. Specifically, it is stipulated that between two adjacent slot units 1, two adjacent slots 2 are symmetrical about the center line N, and the center line is another radius of the rotor punching; on the center line N, a magnetic isolation hole D5-1 is opened on the inner side of the outer end of the adjacent slot 2 between the two adjacent slot units 1, a magnetic isolation groove E5-2 is opened on the outer side of the outer end of the adjacent slot 2 between the adjacent slot units 1, and magnetic isolation holes F5-3 are opened on the left and right sides of the outer end of the adjacent slot 2 between the adjacent slot units 1, respectively, to form an outer end magnetic isolation structure.

[0065] Preferably, see Figure 4 The magnetic isolation groove E5-2 is U-shaped and located at the edge of the rotor punching.

[0066] See also Figure 5 In order to fix the permanent magnet well in the slot 2, a limiting structure is designed at the inner and outer ends of the slot 2. The limiting structure also has the function of adapting to the thermal expansion and contraction of the permanent magnet and can assist in demagnetization.

[0067] At the inner end: in a slot unit 1, the side corresponding to the inner end of the slot 2 includes a straight line segment A6-1 and an arc segment B6-2; the straight line segments A6-1 corresponding to the two slots 2 in a slot unit 1 are symmetrical about the center line M; the arc segment B6-2 corresponding to the two slots 2 in a slot unit 1 is an inferior arc segment with the magnetic isolation hole A3-1 as the center; in a slot 2, the straight line segment A6-1 and the arc segment B6-2 form a limiting structure at the inner end of the slot, and of course also form an auxiliary demagnetization structure at the inner end;

[0068] At the outer end: the edge at the outer end of slot 2 includes a straight line segment E7-1, a straight line segment F7-2, and an arc segment G7-3 which are connected in sequence; wherein, arc segment G7-3 is an arc segment which is concentric with the rotor punching sheet, one end of which is connected to a corner point at the outer end of slot 2, and the other end of which is connected to another corner point at the outer end of slot 2 via straight line segment E7-1 and straight line segment F7-2; the connection between straight line segment E7-1 and straight line segment F7-2 forms a sharp corner 7-4 of the adjacent slot 2 pointing to the adjacent slot unit 1; the connection between straight line segment E7-1 and straight line segment F7-2 forms a notch 7-5 of the adjacent slot 2 facing away from the adjacent slot unit 1; the entire straight line segment E7-1, straight line segment F7-2, and arc segment G7-3 form a structure for limiting the outer end, and also form an auxiliary demagnetization structure at the outer end.

[0069] In the slot unit 1, the structural parameters of the slot are optimally designed. Based on the structure of the above-mentioned rotor punching, the following parameters are used to make the rotor punching have better performance; a slot 2 with a length of 40mm~45mm and a width of 7mm~10mm is used;

[0070] See also Figure 3 , in the case of the size of the above slot 2, the diameter of the rotor punching is selected to be 80mm~300mm, then the spacing S between the outer ends of the two slots 2 in the slot unit 1 is 70mm~110mm, the angle V between the two slots 2 in the slot unit 1 is 120°~130°, and the gap spacing between the inner ends of the two slots 2 in the slot unit 1 is 2.5mm~5mm;

[0071] See also Figure 3 In the case of the above-mentioned size of the slot 2, at the inner end of the slot 2, the length of the straight line segment A6-1 is 4 mm to 4.5 mm.

[0072] See also Figure 4 Under the above-mentioned size of slot 2, at the outer end of slot 2, the distance between arc segment G7-3 and the edge of rotor punching is 1.5mm~2.5mm, and the distance between sharp corner 7-4 and corresponding magnetic isolation groove E5-2 is 2.5mm~3mm; the spacing between relative sharp corners 7-4 in adjacent slots 2 of two adjacent slot units 1 is 7.5mm~8.5mm; the spacing between sharp corner 7-4 and corresponding magnetic isolation hole D5-1 is 1.5mm~3mm.

[0073] See also Figure 1 and Figure 4 In the annular area between the center of the rotor punching sheet and the inner end of the slot 2, a plurality of evenly arranged weight-reducing holes 8 are circumferentially opened.

[0074] On the other hand, see Figure 6 and Figure 7, also discloses a rotor capable of directly outputting usable alternating current, comprising a plurality of rotor punchings, wherein the plurality of rotor punchings are sequentially stacked and designed to form a rotor body; the rotor punchings are the rotor punchings of the above-mentioned structure.

[0075] On the other hand, see Figure 8 , also discloses a permanent magnet generator capable of directly outputting usable alternating current, comprising a stator and a rotor having rotor punchings, wherein the rotor punchings are the rotor punchings of the above structure.

[0076] Experimental Example 1

[0077] It should be noted that when the generator is loaded, the current will generate a reverse magnetic field, and the reverse magnetic field will affect the original magnetic field of the generator. It can be said that the original magnetic field of the generator and the magnetic field in the direction of the current are mutually restricted and affect each other (if the reverse magnetic field cannot have any effect on the original magnetic field, it means that the design is very successful, but this is impossible to achieve). However, no matter how the original magnetic field of the generator and the magnetic field in the direction of the current interact, as long as the sinusoidality of the current of the generator when it is loaded is higher, it means that the design is very good.

[0078] It should be noted that, if the electricity generated by an ordinary generator is not regulated and controlled by a controller, the electricity will directly carry the load, and the sinusoidality of the generated current will be very poor.

[0079] To this end, a 35 kW industrial frequency permanent magnet generator (using 4 poles, m=4) designed according to this scheme is compared with a permanent magnet 24 kW industrial frequency generator of a certain unit in the industry. The test results are shown in Table 1.

[0080] Table 1 Test comparison of this scheme's 35kW industrial frequency permanent magnet generator and a certain company's permanent magnet 24kW industrial frequency generator

[0081]

[0082] It can be seen from the actual measured parameters in Table 1 that: at almost the same volume, the permanent magnet industrial frequency motor of this scheme is stable, and its output power (power density), waveform distortion rate, and voltage regulation rate are significantly higher than those of the existing industrial frequency permanent magnet generator.

[0083] The generator of this scheme directly uses the generated electricity for load work without excitation control (the electricity generated by the generator is not adjusted by the controller). The waveform of the current during operation is a sinusoidal output with a smooth curve. The distortion rate of the current waveform is only about 2.3%, which is much lower than the 5% specified in the military standard for fuel excitation power generation.

[0084] Existing industrial frequency generators, without excitation control (unregulated), instead generate electricity for load work. It can be clearly seen that the output waveform is no longer a sinusoidal output, and many irregular sawtooth patterns appear. The distortion rate of the peaks and troughs is as high as 15%, which is much higher than the 5% specified by the military standard (currently, in order to meet the distortion rate requirements, the military industrial frequency generators must continue to regulate the generated electricity through excitation control before they can be output under load; but this will lead to redundancy in the power generation system and make it easier for the enemy to capture our noise signals, making us easily exposed).

[0085] Experimental Example 2

[0086] For the generator of the present invention in Experimental Example 1, the air gap magnetic field strength was measured under no-load condition.

[0087] from Fig. 9 , Fig.10 It can be seen that the air gap magnetic field strength of the generator of the present invention has a smooth waveform, which further verifies the results measured in Experimental Example 1 (if the air gap magnetic field strength is good enough, then excellent current / voltage and other waveforms can be output under load).

[0088] Experimental Example 3

[0089] It should be noted that when the generator is loaded, the torque of the shaft actually operates in a fluctuating state, so it will make intermittent humming sounds. For the generator, the smoother the torque, the smaller the impact on the motor, and the better the generator.

[0090] At present, the method to make the generator shaft run smoothly is to use more poles and more slots (increase the number of permanent magnets), but the cost will rise immediately, and the size of the generator will also need to be larger. However, in order to allow the electricity generated by the generator to be used directly without excitation regulation (without a controller), it must meet the requirements of the "National Military Standard" of 50HZ and 1500 rpm; to meet the 50HZ requirement, m=4 must be used, and it is impossible to use more poles and more slots to make the generator shaft run smoothly.

[0091] The structural design of the utility model meets the requirements of the national military standard and the rotating shaft of the designed generator can still run smoothly without adopting a multi-pole number.

[0092] For verification, the torque fluctuation of the generator of the utility model in Experimental Example 1 under load is measured, and the results are as follows: Fig.11 , Fig.12 shown.

[0093] exist Fig.11 , Fig.12In the figure, the three curves are electromagnetic torque, mechanical torque (formed by electromagnetic torque, the purple curve), and additional torque (reluctance torque). The average mechanical torque is about 180, and the peak and trough are about 190 and 170 respectively. The fluctuation of mechanical torque is very small, and the effect is excellent.

[0094] Experimental Example 3

[0095] The quality of electricity generated by the generator of the present invention in Experimental Example 1 was tested, and the results are shown in Table 2.

[0096] Table 2 Power quality test table of the generator of the utility model

[0097]

[0098] It can be seen from Table 2 that the steady-state voltage regulation rate is about 3.10% (the national military standard captures at 120ms, and the utility model captures at 50ms during detection, so the data detected by the utility model will be lower according to the national military standard - it will be a few tenths of a percent); the transient voltage regulation rate is about 4.04% (according to the verification method of the national military standard, this solution will also be lower). Therefore, in the utility model, the voltage regulation rate is low (currently similar generators can meet the national military standard requirements at low power, but at high power, the performance deteriorates rapidly and cannot meet the national military standard requirements; the solution currently often used by technicians in this field is to increase the rotor size).

[0099] The above embodiments only express the preferred implementation modes, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model.

Claims

1. A rotor lamination capable of directly outputting usable alternating current, characterized in that: A plurality of slot units (1) are circumferentially formed in the rotor punching sheet; The slot unit (1) includes two slots (2), and a V-shaped structure is formed between the two slots (2), that is, the two slots (2) approach each other at the inner ends close to the center of the punching sheet and expand from each other at the outer ends close to the edge of the punching sheet; in the slot unit (1), there is a gap between the inner ends of the two slots (2); In the slot unit, the distance S between the outer ends of the two slots (2) satisfies the relationship: S = πD·k2 / m; Wherein, π is the circumference ratio, π = 3.14159; D is the circumferential diameter of the rotor punching sheet; K2 is a defined coefficient, 0.85 < K2 < 1.65; m is the number of slots for inlaying permanent magnets on the entire punching sheet rotor, that is, the total number of all slots on the entire rotor punching sheet, m = 2, 4, 6, 8, 10, 12, 24, 36; In the slot unit (1), the V-shaped angle between the two slots (2) satisfies the relationship: V = 2k1·A / m; Wherein, K1 is a defined coefficient, 0.9 < k1 < 1.85; A represents the circumferential angle, A = 360°; 2. The rotor punching capable of directly outputting usable alternating current according to claim 1, characterized in that: In the described slot unit (1), the two slots (2) are symmetric about the center line M, and the center line M is a radius of the rotor punching sheet; On the center line M, a magnetic isolation hole A (3-1) is formed at the inner side close to the inner ends of the two slots (2), and a magnetic isolation hole B (3-2) is formed at the outer side close to the inner ends of the two slots (2); the magnetic isolation hole A (3-1) has a rectangular hole portion (3-1-1), and the rectangular hole portion (3-1-1) points to the magnetic isolation hole B (3-2), forming an inner-end magnetic isolation structure; 3. The rotor punching sheet capable of directly outputting usable alternating current according to claim 2, characterized in that: In the described slot unit (1), the side corresponding to the inner end of the slot (2) includes a straight line segment A (6-1) and an arc segment B (6-2); The straight line segments A (6-1) respectively corresponding to the two slots (2) in one slot unit (1) are symmetric about the center line M, and the arc segments B (6-2) respectively corresponding to the two slots (2) in one slot unit (1) are minor arc segments with the magnetic isolation hole A (3-1) as the center of the circle; In one slot (2), the straight line segment A (6-1) and the arc segment B (6-2) form a limiting structure at the inner end of the slot and also form an auxiliary demagnetization structure at the inner end; 4. The rotor punching sheet capable of directly outputting usable alternating current according to claim 2 or 3, characterized in that: On the center line M, a magnetic isolation hole C (4-1) is formed at the middle position from the inner end of the slot (2) to the edge of the rotor punching sheet, forming a middle magnetic isolation structure; 5. The rotor punching sheet capable of directly outputting usable alternating current according to claim 4, characterized in that: Between two adjacent slot units (1), the two adjacent slots (2) are symmetric about the center line N, and the center line is another radius of the rotor punching sheet; On the center line N, a magnetic isolation hole D (5-1) is formed at the inner side close to the outer ends of the adjacent slots (2) between two adjacent slot units (1), a magnetic isolation groove E (5-2) is formed at the outer side of the outer ends of the adjacent slots (2) between two adjacent slot units (1), and magnetic isolation holes F (5-3) are respectively formed at the left and right sides of the outer ends of the adjacent slots (2) between two adjacent slot units (1), forming an outer-end magnetic isolation structure; 6. The rotor punching capable of directly outputting usable alternating current according to claim 5, characterized in that: The slot (2) is in the shape of a long rectangle, and the edges at the outer ends thereof include a straight line segment E (7-1), a straight line segment F (7-2), and an arc segment G (7-3) which are connected in sequence; The arc segment G (7-3) is an arc segment cocentric with the rotor punching sheet, one end of which is connected to a corner point at the outer end of the slot (2), and the other end of which is connected to another corner point at the outer end of the slot (2) via the straight line segment E (7-1) and the straight line segment F (7-2); the connection between the straight line segment E (7-1) and the straight line segment F (7-2) forms a sharp corner (7-4) of the adjacent slot (2) pointing to the adjacent slot unit (1); the connection between the straight line segment E (7-1) and the straight line segment F (7-2) forms a notch (7-5) of the adjacent slot (2) facing away from the adjacent slot unit (1); the entire straight line segment E (7-1), the straight line segment F (7-2) and the arc segment G (7-3) form an outer end limit structure, and also form an auxiliary demagnetization structure at the outer end.

7. The rotor punching sheet capable of directly outputting usable alternating current according to claim 6, characterized in that: The diameter D of the rotor punching sheet is 80 mm to 300 mm; The gap distance between the inner ends of the two slots (2) in the slot unit (1) is 2.5 mm to 5 mm; The length of the slot (2) is 40 mm to 45 mm, and the width of the slot (2) is 7 mm to 10 mm.

8. The rotor punching sheet capable of directly outputting usable alternating current according to claim 3, characterized in that: The length of the straight line segment A (6-1) is 4 mm to 4.5 mm.

9. The rotor punching sheet capable of directly outputting usable alternating current according to claim 8, characterized in that: The distance between the arc segment G (7-3) and the edge of the rotor punching sheet is 1.5 mm to 2.5 mm, and the distance between the sharp corner (7-4) and the corresponding magnetic isolation groove E (5-2) is 2.5 mm to 3 mm; the spacing between the opposite sharp corners (7-4) in adjacent slots (2) of two adjacent slot units (1) is 7.5 mm to 8.5 mm; the spacing between the sharp corner (7-4) and the corresponding magnetic isolation hole D (5-1) is 1.5 mm to 3 mm.

10. A permanent magnet generator, comprising a stator and a rotor having rotor punchings, characterized in that: The rotor punching is the rotor punching described in any one of claims 1 to 8.

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