CN202696297U - Stator punching sheet, stator core and motor - Google Patents

Abstract

The utility model provides a stator punching sheet, stator core and motor, this stator punching sheet has the annular yoke portion of circle and from a plurality of teeth that yoke portion extended to centre of a circle direction, form the groove between two adjacent teeth, and stator punching sheet has the interior round hole of cavity, the excircle diameter of stator punching sheet is between 115 millimeters to 125 millimeters, and, the quantity in groove is 32, the diameter in interior round hole is between 70 millimeters to 80 millimeters, the notch width in groove is between 1.8 millimeters to 2.5 millimeters, the groove shoulder width in groove is between 3.9 millimeters to 4.6 millimeters, the notch height in groove is between 0.6 millimeters to 1.2 millimeters, the groove shoulder height in groove is between 0.8 millimeters to 1.3 millimeters. The utility model discloses a stator punching is less to the use amount of silicon steel sheet, improves the rate of utilization of silicon steel sheet, makes the magnetic field density of yoke portion and tooth portion more even, vibration and noise when reducing the motor operation.

Description

Stator punching, stator core and motor

technical field

The utility model relates to the field of motors, in particular to a stator punch, a stator core formed by laminating the stator punch and a motor with the stator core.

Background technique

Motors are widely used in various electrical equipment in industrial production and life. Referring to FIG. 1, the existing motor has a housing 10 and end covers 11 and 12 located at both ends of the housing 10, the housing 10 and end covers 11 and 12 A cavity is enclosed, and a stator 15 and a rotor 18 are installed in the cavity, and the stator 15 has a stator core 16 and a coil 17 embedded in the stator core 16 . The rotor 18 is installed in the stator 15 and is rotatable relative to the stator 15 . The rotor shaft 19 is installed in the rotor 18 and has an interference fit with the rotor 18, and rotates driven by the rotor 18 to output power outward.

The stator core 16 is formed by laminating a plurality of stator punches of the same shape. Referring to FIG. The yoke 21 located on the periphery has 32 teeth 22 extending toward the center of the stator punching plate 20 , and slots 23 are formed between two adjacent teeth 22 , so the number of slots 23 is also 32. Moreover, a hollow inner circular hole 24 is opened in the tooth 22 .

In the existing stator stamping 20, the outer diameter φA1 is 120 mm, and the diameter φB1 of the inner hole is 68 mm. Therefore, the ring width H of the stator stamping 20 is relatively large, resulting in the slot 23 of the stator stamping 20 being relatively long and narrow. The area of the groove 23 is also relatively large, and the utilization rate of the area of the groove 23 is low, which also leads to a low utilization rate of the silicon steel sheet.

Moreover, the stator iron core 16 made of the stator punching sheet 20 has a relatively large leakage flux coefficient, which causes the maximum torque and starting torque of the motor to decrease, and the temperature of the motor is high during operation, resulting in a short service life of the motor, thereby affecting Reliability of motor operation.

In addition, using the stator iron core 16 made of the above-mentioned stator stamping 20, when the motor is running, the magnetic field density of the yoke 21 is about 4950 Gauss, while the magnetic field density at the teeth 22 is 13590 Gauss, which results in a magnetic field density on the stator 15 If it is not uniform, it will easily cause vibration and noise when the motor is running. In order to improve the efficiency and magnetic flux of the motor, the number of coil windings and the number of punched stator cores are usually increased to improve the magnetic load, but this will greatly increase the production cost of the motor.

Contents of the invention

The main purpose of the utility model is to provide a stator punching sheet which makes the magnetic field density of the stator relatively uniform.

Another purpose of the utility model is to provide a stator core with a higher utilization rate of silicon steel sheets.

Another object of the utility model is to provide a motor with high working reliability and low noise.

In order to achieve the main purpose of the utility model, the stator punch provided by the utility model has a ring-shaped yoke and a plurality of teeth extending from the yoke to the center of the circle, grooves are formed between two adjacent teeth, and the stator The punching sheet has a hollow inner hole, the outer diameter of the stator punching sheet is between 115mm and 125mm, and the number of slots is 32, the diameter of the inner hole is between 70mm and 80mm, and the slot diameter is between 70mm and 80mm. The mouth width is between 1.8mm and 2.5mm, the groove shoulder width is between 3.9mm and 4.6mm, the groove height is between 0.6mm and 1.2mm, and the groove shoulder height is between 0.8mm and 1.3mm between.

It can be seen from the above scheme that the outer diameter of the stator punching sheet does not increase significantly, and the diameter of the inner hole is larger, the ring width is smaller, the magnetic field density of the yoke and the teeth are closer, and the magnetic field density of the stator is more uniform when the motor is running. Avoid large vibration of the motor, thereby reducing the noise generated by the motor. In addition, since the outer diameter of the stator punching sheet does not change significantly, while the diameter of the inner hole increases, the area of the slot can be reduced, thereby reducing the amount of silicon steel sheet used and increasing the utilization rate of silicon steel sheet.

A preferred solution is that the groove top radius of the groove is between 2.8mm and 3.3mm. Since the radius of the groove top of the groove is also appropriately reduced, the area of the groove is reduced and a large amount of waste of silicon steel sheets is avoided.

In order to achieve another purpose of the utility model, the stator core provided by the utility model is formed by laminating a plurality of stator punches of the same shape, and each stator punch has a ring-shaped yoke and a A plurality of teeth extending in the direction, slots are formed between two adjacent teeth, and the stator punch has a hollow inner hole, the outer diameter of the stator punch is between 115 mm and 125 mm, and the number of slots is 32 pieces, the diameter of the inner circular hole is between 70mm and 80mm, the width of the groove is between 1.8mm and 2.5mm, the width of the shoulder of the groove is between 3.9mm and 4.6mm, the height of the groove is between The height of the groove shoulder is between 0.6mm and 1.2mm, and the height of the groove shoulder is between 0.8mm and 1.3mm.

It can be seen from the above scheme that the diameter of the inner hole of the stamping sheet of the stator core is increased, the ring width is reduced, the area of the slot is reduced, the utilization rate of the silicon steel sheet is improved, and the magnetic field of the teeth and the yoke is reduced when the motor is running. The density is more uniform, avoiding the large vibration caused by the motor running.

In order to achieve another purpose of the utility model, the motor provided by the utility model includes a stator and a rotor. The stator includes a stator core and a coil embedded in the stator core. The stator core is laminated by multiple stator punches with the same shape. Each stator punch has a ring-shaped yoke and a plurality of teeth extending from the yoke to the center of the circle. A slot is formed between two adjacent teeth, and the stator punch has a hollow inner hole. The stator The outer diameter of the punching sheet is between 115mm and 125mm, and the number of grooves is 32, the diameter of the inner hole is between 70mm and 80mm, and the width of the groove is between 1.8mm and 2.5mm The groove shoulder width of the groove is between 3.9 mm and 4.6 mm, the height of the notch of the groove is between 0.6 mm and 1.2 mm, and the height of the groove shoulder of the groove is between 0.8 mm and 1.3 mm.

It can be seen that the diameter of the outer circle of the stator punching of the motor is closer to the diameter of the inner hole, and the magnetic field density of the yoke and teeth is also closer, so that the magnetic field density of the stator is more uniform, and the motor is more stable during operation. That is, the reliability of the motor operation is improved, and the noise generated is small.

Description of drawings

Fig. 1 is a half sectional view of an existing motor.

Fig. 2 is a structural diagram of a conventional stator punch.

Fig. 3 is a structural diagram of an embodiment of the stator punching sheet of the present invention.

Fig. 4 is a partially enlarged view of an embodiment of the stator punching sheet of the present invention.

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Detailed ways

The motor of this embodiment has a housing and end covers located on both sides of the housing. The housing and the end covers form a cavity. A stator and a rotor are installed in the cavity. The stator has a stator core and is embedded on the stator core. The coils of the rotor are installed in the stator and can rotate relative to the stator. The rotor shaft is installed in the rotor, and has an interference fit with the rotor, and rotates under the drive of the rotor, thereby outputting power outward.

The stator core is formed by laminating multiple stator punches of the same shape, and each stator punch is stamped from silicon steel sheets. Referring to FIG. 3 , the stator punching piece 30 is roughly in the shape of a ring, which has a yoke 31 and 32 teeth 32 extending from the yoke 31 to the center of the stator punching piece 30 , and a groove 33 is formed between two adjacent teeth 32 , so the number of slots 33 is also 32. Moreover, a hollow inner circular hole 34 is opened in the middle of the stator punching plate 30 .

In this embodiment, the diameter φA of the outer circle of the stator punch 30 is between 115 mm and 120 mm, preferably 120 mm. The diameter φB of the inner hole 34 is between 70 mm and 80 mm, preferably 76 mm.

Referring to FIG. 4 , the notch width C of the slot 33 of the stator punching plate 30 is between 1.8 mm and 2.5 mm, preferably 2.3 mm, and the slot shoulder width D is between 3.9 mm and 4.6 mm, preferably 4.14 mm. mm. Moreover, the notch height E is between 0.6mm and 1.2mm, preferably 0.91mm, and the groove shoulder height F is between 0.8mm and 1.3mm, preferably 1.0mm. In addition, the groove top radius R of the groove 33 is between 2.8 mm and 3.3 mm, preferably 3.05 mm.

In this way, since the outer diameter φA of the stator punch 30 does not decrease, but the diameter φB of the inner hole increases, the ring width of the stator punch 30 decreases, thereby reducing the amount of silicon steel sheet used, and also making the yoke 31 and the magnetic field density on the teeth 32 are more uniform. Through the measurement of the magnetic field density of the stator core, using the stator core made of the stator punch of this embodiment, the magnetic field density of the yoke 31 is 7190 Gauss while the magnetic field density of the tooth 32 is 12210 Gauss when the motor is running. It can be seen that the magnetic field density of the yoke 31 is relatively close to the magnetic field density of the teeth 32, so that the magnetic field distribution on the stator core is more uniform when the motor is running, the motor is not easy to vibrate, and the noise is correspondingly reduced.

Moreover, due to the redesign of the notch width C, the notch shoulder width D, the notch height E, the notch shoulder height F and the groove top radius R of the notch 33, the area of the notch 33 is reduced, and the use of the silicon steel sheet is improved. Rate. At the same time, the maximum torque of the motor made of the stator punch 30 is increased, which can also prevent the motor from overheating during operation and prolong the service life of the motor.

Finally, it should be emphasized that the utility model is not limited to the above-mentioned embodiments, such as changes in the width of the notch, the width of the shoulder, the height of the notch, the height of the shoulder and the radius of the groove top within the set size range should also be included in the utility model. within the scope of the claims.

Claims (10)

1. Stator punching, including An annular yoke and a plurality of teeth extending from the yoke toward the center of the circle, slots are formed between two adjacent teeth, and the stator punch has a hollow inner circular hole. The outer diameter is between 115 mm and 125 mm; It is characterized by: The number of the grooves is 32, the diameter of the inner circular hole is between 70 mm and 80 mm, the width of the notch of the groove is between 1.8 mm and 2.5 mm, and the width of the shoulder of the groove is 3.9 mm. mm to 4.6 mm, the notch height of the groove is between 0.6 mm and 1.2 mm, and the shoulder height of the groove is between 0.8 mm and 1.3 mm. 2. The stator punching sheet according to claim 1, characterized in that: The groove top radius of the groove is between 2.8mm and 3.3mm. 3. The stator punching sheet according to claim 1 or 2, characterized in that: The diameter of the outer circle is 120 mm, the diameter of the inner hole is 76 mm, the width of the slot is 2.3 mm, the width of the shoulder of the slot is 4.14 mm, and the height of the slot is 0.91 mm. Shoulder height is 1.0 mm. 4. The stator punching sheet according to claim 2, characterized in that: The groove top radius is 3.05mm. 5. The stator core is formed by laminating multiple stator punches with the same shape. Each stator punch has a ring-shaped yoke and a plurality of teeth extending from the yoke to the center of the circle. A slot is formed between two adjacent teeth, and the stator punch has a hollow inner hole, and the outer diameter of the stator punch is between 115 mm and 125 mm; It is characterized by: The number of the grooves is 32, the diameter of the inner circular hole is between 70 mm and 80 mm, the width of the notch of the groove is between 1.8 mm and 2.5 mm, and the width of the shoulder of the groove is 3.9 mm. mm to 4.6 mm, the notch height of the groove is between 0.6 mm and 1.2 mm, and the shoulder height of the groove is between 0.8 mm and 1.3 mm. 6. The stator core according to claim 5, characterized in that: The groove top radius of the groove is between 2.8mm and 3.3mm. 7. The stator core according to claim 5 or 6, characterized in that: The diameter of the outer circle is 120 mm, the diameter of the inner hole is 76 mm, the width of the slot is 2.3 mm, the width of the shoulder of the slot is 4.14 mm, and the height of the slot is 0.91 mm. Shoulder height is 1.0 mm. 8. Motor, including A stator and a rotor, the stator has a stator core and a coil embedded in the stator core, the stator core is formed by laminating a plurality of stator punches of the same shape, each of the stator punches has An annular yoke and a plurality of teeth extending from the yoke toward the center of the circle, slots are formed between two adjacent teeth, and the stator punch has a hollow inner circular hole. The outer diameter is between 115 mm and 125 mm; It is characterized by: The number of the grooves is 32, the diameter of the inner circular hole is between 70 mm and 80 mm, the width of the notch of the groove is between 1.8 mm and 2.5 mm, and the width of the shoulder of the groove is 3.9 mm. mm to 4.6 mm, the notch height of the groove is between 0.6 mm and 1.2 mm, and the shoulder height of the groove is between 0.8 mm and 1.3 mm. 9. The motor according to claim 8, characterized in that: The groove top radius of the groove is between 2.8mm and 3.3mm. 10. The motor according to claim 8 or 9, characterized in that: The diameter of the outer circle is 120 mm, the diameter of the inner hole is 76 mm, the width of the slot is 2.3 mm, the width of the shoulder of the slot is 4.14 mm, and the height of the slot is 0.91 mm. Shoulder height is 1.0 mm.

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