Direct-current brushless vector motor

Abstract

The utility model discloses a direct current brushless vector motor, relates to the motor technology field, the direct current brushless vector motor comprises a housing, a stator assembly and a rotor assembly, the stator assembly comprises a plurality of stator yokes, the plurality of stator yokes are arranged on the inner side of the housing at intervals along the circumferential direction, and the rotor assembly is arranged on the housing. A stator tooth is arranged between every two stator yokes, a coil winding is arranged on each stator tooth, the rotor assembly is arranged in the center of the stator assembly, the rotor assembly is of a star-shaped structure formed by stacking and riveting cold-punched silicon steel sheets, and when the coil windings are powered on, the coil windings are connected with the coil windings. The magnetic field of the stator assembly generates attractive force to drive the rotor assembly to rotate, the rotor assembly is of a star-shaped structure made of silicon steel sheets, a coil does not need to be wound, a permanent magnet does not need to be adopted, counter electromotive force cannot be generated, current of the motor under the same power is reduced, and electric energy consumption of the motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric motors, in particular to a brushless DC vector motor. Background Art

[0002] The brushless DC motor consists of a motor body and a driver. It is a typical mechatronics product. The stator winding of the motor is mostly made into a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor. The rotor of the motor is adhered with a magnetized permanent magnet. In order to detect the polarity of the motor rotor, a position sensor is also installed in the motor; the driver is composed of power electronic devices and integrated circuits, etc. Its functions are: receiving the start, stop, and brake signals of the motor to control the start, stop and braking of the motor; receiving the position sensor signal and the forward and reverse rotation signal to control the on and off of each power tube of the inverter bridge to generate continuous torque; receiving the speed command and speed feedback signal to control and adjust the speed.

[0003] The brushless DC motor in the prior art generates magnetism by using permanent magnets to make the rotor or winding coils on the rotor. However, the permanent magnets or the winding coils generate back electromotive force, resulting in a large current in the motor and high power consumption. Utility Model Content

[0004] The embodiment of the utility model provides a brushless DC vector motor to solve the technical problem in the related art that the rotor of the existing motor uses permanent magnets or winding coils to generate back electromotive force, resulting in large current and high power consumption of the motor.

[0005] The present invention provides a brushless DC vector motor, comprising:

[0006] case;

[0007] A stator assembly, the stator assembly comprising a plurality of stator yokes, the plurality of stator yokes being arranged at intervals along the circumferential direction on the inner side of the housing, a stator tooth being provided between every two stator yokes, and a coil winding being provided on the stator teeth;

[0008] The rotor assembly is arranged at the center of the stator assembly, and the rotor assembly is formed by stacking and riveting cold-stamped silicon steel sheets into a star-shaped structure;

[0009] When the coil winding is energized, the magnetic field of the stator assembly generates an attractive force to drive the rotor assembly to rotate.

[0010] In some embodiments, the stator teeth include:

[0011] a first connecting plate, the first connecting plate being embedded between the two stator yokes, the first connecting plate being an arc-shaped structure and matching the housing;

[0012] A connecting post, the connecting post is provided in the middle of the first connecting plate, and both sides of the connecting post are winding grooves;

[0013] The second connecting plate is provided at the other end of the connecting column, and the second connecting plate also has an arc-shaped structure.

[0014] In some embodiments, the stator teeth are I-shaped, and the first connecting plate is longer than the second connecting plate.

[0015] In some embodiments, a connection hole is provided on one side of the first connection plate and the second connection plate respectively for connection with the housing.

[0016] In some embodiments, the rotor assembly includes:

[0017] shaft;

[0018] A plurality of tooth poles are arranged outside the rotating shaft at intervals along a circumferential direction, and each of the tooth poles protrudes from the rotating shaft and extends to the front of the stator yoke.

[0019] In some embodiments, the top end of each tooth pole is an arc-shaped structure and matches the second connecting plate.

[0020] In some embodiments, the number of the tooth poles and the number of the stator yokes are both even.

[0021] In some embodiments, the stator yoke is a convex structure, a groove is provided on a side of the stator yoke close to the housing, and a side of the stator yoke away from the housing is an arc-shaped structure and matches the top of the tooth pole.

[0022] In some embodiments, a plurality of fixing holes are provided on the exterior of the shell along a circumferential direction.

[0023] In some embodiments, the stator teeth are made of cold-stamped silicon steel sheets or low-carbon steel sheets that are stacked and riveted together.

[0024] The beneficial effects brought about by the technical solution provided by the utility model include:

[0025] An embodiment of the present utility model provides a DC brushless vector motor, comprising a housing, a stator assembly and a rotor assembly, wherein the stator assembly comprises a plurality of stator yokes, which are arranged on the inner side of the housing at intervals along the circumferential direction, with a stator tooth provided between every two stator yokes, and a coil winding provided on the stator tooth. The rotor assembly is arranged at the center of the stator assembly, and the rotor assembly is formed by stacking and riveting cold-stamped silicon steel sheets to form a star-shaped structure. When the coil winding is energized, the magnetic field of the stator assembly generates an attractive force to drive the rotor assembly to rotate. The rotor assembly is formed by silicon steel sheets into a star-shaped structure, does not require winding coils, does not require the use of permanent magnets, does not generate back electromotive force, reduces the current of the motor at the same power, and reduces the power consumption of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the overall structure of a brushless DC vector motor provided by an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the specific structure of a brushless DC vector motor provided by an embodiment of the utility model;

[0029] Figure 3 A schematic structural diagram of stator teeth provided in an embodiment of the present utility model;

[0030] Figure 4 A schematic structural diagram of a rotor assembly provided in an embodiment of the present utility model;

[0031] Figure 5 A schematic diagram of a star connection provided in an embodiment of the present utility model;

[0032] Figure 6 A schematic diagram of the power-on steps provided in an embodiment of the present utility model;

[0033] Figure 7 This is a schematic diagram of the working principle of an embodiment of the utility model;

[0034] Figure 8 A schematic diagram of a three-phase six-pole circuit provided by an embodiment of the present utility model;

[0035] Figure 9 A schematic diagram of a six-phase six-pole circuit provided by an embodiment of the present utility model;

[0036] Figure 10 A schematic diagram of a six-phase twelve-pole circuit provided by an embodiment of the present utility model;

[0037] Reference numerals:

[0038] 1. Shell; 11. Fixing hole;

[0039] 2. Stator assembly; 21. Stator yoke; 211. Groove; 22. Stator tooth; 221. First connecting plate; 222. Connecting column; 2221. Winding slot; 223. Second connecting plate;

[0040] 3. Coil winding;

[0041] 4. Rotor assembly; 41. Rotating shaft; 42. Tooth pole. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] The embodiment of the utility model provides a brushless DC vector motor, which can solve the technical problem that the rotor of the existing motor uses permanent magnets or winding coils to generate back electromotive force, resulting in large current and high power consumption of the motor.

[0044] Figure 1 An embodiment of the present utility model provides a brushless DC vector motor, comprising: a housing 1 , a stator assembly 2 and a rotor assembly 4 .

[0045] The stator assembly 2 includes a plurality of stator yokes 21, which are arranged at intervals along the circumferential direction on the inner side of the shell 1. A stator tooth 22 is provided between every two stator yokes 21, and a coil winding 3 is provided on the stator tooth 22. The rotor assembly 4 is provided at the center of the stator assembly 2. The rotor assembly 4 is formed by stacking and riveting cold-stamped silicon steel sheets to form a star-shaped structure. When the coil winding 3 is energized, the magnetic field of the stator assembly 2 generates an attractive force to drive the rotor assembly 4 to rotate.

[0046] The DC brushless vector motor of the embodiment of the present invention is provided with a housing, a stator assembly and a rotor assembly, the stator assembly including a plurality of stator yokes, the plurality of stator yokes being arranged at intervals along the circumferential direction on the inner side of the housing, a stator tooth being provided between every two stator yokes, the stator teeth being provided with coil windings, the rotor assembly being provided at the center of the stator assembly, the rotor assembly being formed by stacking and riveting cold-stamped silicon steel sheets to form a star-shaped structure, when the coil windings are energized, the magnetic field of the stator assembly generates an attractive force to drive the rotor assembly to rotate, the stator assembly uses a minimum current to generate a magnetic field attractive force to drive the rotor assembly to rotate, the rotor assembly being formed by forming a star-shaped structure with silicon steel sheets, no coil winding is required, no permanent magnet is required, no back electromotive force is generated, the current of the motor is reduced at the same power, the power consumption of the motor is reduced, there is no need to set a position sensor on the rotor assembly, the manufacturing cost of the motor is reduced, and the structure is simpler.

[0047] Specifically, see Figure 1 and Figure 3As shown, the stator teeth 22 are provided with coil windings 3 and generate a soft magnetic field when energized, that is, a magnetic field exists when energized and disappears immediately when the power is removed. The magnetic field polarity of the stator teeth 22 near the rotor assembly 4 is all N or all S. The motor controller uses a DSP microprocessor in combination with other electronic components to fully detect the motor to ensure reliable operation of the vector motor. When the controller issues a command to rotate the rotor assembly 4 in a clockwise direction, the DSP microprocessor performs online detection and calculation, issues a PWM waveform control signal, and adjusts it through the MOSFET to control the current and voltage of the coil windings 3 on the stator teeth 22. When the voltage of the coil windings 3 on the stator teeth 22 is constant, the DSP microprocessor provides a minimum starting current to the 6F and 3C terminals. Based on the winding direction and current direction of the coil windings 3 on the stator teeth 22, it can be determined that the magnetic poles of the stator teeth 6F and 3C pointing to the center of the circle are both N poles. When power is applied to the stator tooth 6F, a When a magnetic field is generated, tooth pole X4 near the end of stator tooth 6F is induced to an S pole by the magnetic field. At this time, the magnetic poles appear in pairs, and tooth pole X2 is an N pole. According to the principle of like charges repel and opposite charges attract, tooth pole X4 rotates toward the end of stator tooth 6F under the action of the magnetic field force. After the coil winding 3 on the stator tooth 22 is energized, stator tooth 3C also generates an N pole magnetic field. The N pole of stator tooth 3C and the N pole of tooth pole X2 repel each other, and tooth pole X2 rotates away from the end of stator tooth 3C under the action of the magnetic field force, causing the rotor assembly 4 to rotate clockwise. Then, stator teeth 6F and 3C are de-energized, and stator teeth 1F, 4D, 2B, and 5E are energized in sequence. Similarly, the rotor assembly 4 is attracted to rotate clockwise. Similarly, controlling the current and voltage of the coil winding 3 on the stator tooth 22 can also control the counterclockwise rotation of the rotor assembly 4. The attractive force generated by the magnetic field of the stator assembly 2 can be used to drive the rotor assembly 4 to rotate.

[0048] As an optional embodiment, in a utility model implementation, see Figure 2 and Figure 4As shown, the stator teeth 22 include: a first connecting plate 221, a connecting column 222 and a second connecting plate 223. The first connecting plate 221 is embedded between the two stator yokes 21. The first connecting plate 221 is an arc-shaped structure and matches the housing 1. The connecting column 222 is located in the middle of the first connecting plate 221, and both sides of the connecting column 222 are winding grooves 2221. The second connecting plate 223 is located at the other end of the connecting column 222. The second connecting plate 223 is also an arc-shaped structure. One of the first connecting plates 221 is embedded between the two stator yokes. 21, the use of silicon steel sheets can be reduced, the iron loss is reduced, and the cost is also reduced. The first connecting plate 221 is fitted with the inner side of the shell 1, and the first connecting plate 221 and the multiple stator yokes 21 form an outer ring in the shell 1, and the rotor assembly 4 forms an inner ring in the middle of the shell 1. After the coil winding 3 is wound on the connecting column 222 and energized, the stator teeth 22 generate a magnetic field, and the attraction of the magnetic field pulls the rotor assembly 4 to rotate in the middle of the shell 1, and the winding slot 2221 simplifies the coil winding process and reduces practical costs.

[0049] The coil windings 3 on the stator teeth 22 are connected in a star configuration. Figure 6 and Figure 7 As shown, the present invention is set as a three-phase six-pole, and the three-phase six-pole winding is energized according to the following rules: in each step, current flows into one of the three windings and current flows out of one winding, the magnetic field rotates 60 degrees in each step, the magnetic field rotates one circle in every six steps, and only one winding is commutated in each step, and the power-on sequence is 1: A+B-, 2: C+B-, 3: C+A-, 4: B+A-, 5: B+C-, 6: A+C-; as the magnetic field rotates, the rotor assembly 4 is attracted to rotate accordingly, when the magnetic field rotates clockwise, the motor rotates clockwise, that is, rotates in the order from 1 to 6, and when the magnetic field rotates counterclockwise, the motor rotates counterclockwise, that is, rotates in the order from 6 to 1; in addition, the present invention can also be set as a six-phase six-pole or six-phase twelve-pole, specifically, Figure 8 This is the circuit schematic diagram of three-phase six-pole. Figure 9 Six-phase six-pole circuit schematic diagram, Figure 10 This is a six-phase twelve-pole circuit schematic.

[0050] As an optional embodiment, in a utility model implementation, see Figure 4As shown, the stator tooth 22 is an I-shaped structure, and the length of the first connecting plate 221 is longer than the second connecting plate 223. The I-shaped structure is not easy to deform or twist, and can withstand large loads. The winding groove 2221 formed in the middle is convenient for fixing the coil winding 3. The length of the first connecting plate 221 is consistent with the distance between the top ends of the two stator yokes 21, and the length of the second connecting plate 223 is consistent with the distance between the bottom ends of the two stator yokes 21, so that the stator tooth 22 is embedded between the two stator yokes 21, and the inductance of each phase of the stator tooth 22 is distributed as a space vector.

[0051] As an optional embodiment, in a utility model implementation, see Figure 4 As shown, one side of the first connecting plate 221 and the second connecting plate 223 is correspondingly provided with a connecting hole for connecting with the shell 1. Specifically, rivets are used to penetrate the connecting holes to fix the first connecting plate 221 and the second connecting plate 223 to the shell 1.

[0052] As an optional embodiment, in a utility model implementation, see Figure 4 As shown, the rotor assembly 4 includes: a rotating shaft 41 and a plurality of tooth poles 42, and the plurality of tooth poles 42 are arranged at intervals outside the rotating shaft 41 along the circumferential direction. Each of the tooth poles 42 protrudes from the rotating shaft 41 and extends to the front of the stator yoke 21. When the coil winding 3 on the connecting column 222 is energized, the stator teeth 22 generate a magnetic field, and the attraction of the magnetic field pulls the plurality of tooth poles 42 to rotate around the rotating shaft 41. There are no coils set on the plurality of tooth poles 42, nor are they made of permanent magnets, so there is no back electromotive force. Under the same power, the current of the motor is small, which can achieve energy saving. At the same time, the plurality of tooth poles 42 are stacked with silicon steel sheets and operate stably at high and low temperatures. There is no temperature rise because there is no coil winding on the plurality of tooth poles 42. Therefore, the motor does not need complex devices such as cooling fans, commutators or slip rings, which reduces the size of the motor and simplifies the structure of the motor.

[0053] As an optional embodiment, in a utility model implementation, see Figure 2 and Figure 5 As shown, the top of each tooth pole 42 is an arc-shaped structure and matches the second connecting plate 223. The top of the tooth pole 42 is located in front of the second connecting plate 223 and the stator yoke 21. The arc curvature of the top of the tooth pole 42 is the same as the arc curvature of the second connecting plate 223. Then, the tooth pole 42 has no contact with the second connecting plate 223, so that the tooth pole 42 will not collide when rotating in the middle of the shell 1.

[0054] As an optional embodiment, in a utility model implementation, see Figure 2As shown, the number of the tooth poles 42 and the stator yoke 21 are both even numbers, which can simplify the wiring of the motor and ensure the balance of the motor magnetic field. The number of the tooth poles 42 and the stator yoke 21 depends on the power of the motor. The number of the tooth poles 42 and the stator yoke 21 determines the number of the motor poles. The more poles there are, the lower the motor speed is. The lower the motor speed is, the lower the power is. The utility model is set as three-phase six-pole, with a lower speed and larger torque. The gap between each salient pole of the three-phase six-pole is 60 degrees. The more salient poles there are, the smaller the gap between the salient poles is, and the attraction to the tooth pole 42 is smaller. When the voltage of the power supply is constant, the starting current is also small, which can solve the defect of large instantaneous torque pulsation during the phase-changing operation of the motor.

[0055] As an optional embodiment, in a utility model implementation, see Figure 2 As shown, the stator yoke 21 is a convex structure, and a groove 211 is provided on the side of the stator yoke 21 close to the shell 1, and the side of the stator yoke 21 away from the shell 1 is an arc-shaped structure and matches the top of the tooth pole 42. Each stator yoke 21 is provided with the groove 211 on the side close to the shell 1, and the first connecting plate 221 of the stator tooth 22 is embedded between the grooves 211 of the two stator yokes 21, and the length of the first connecting plate 221 is consistent with the width between the grooves 211 of the two stator yokes 21. The arc curvature of the stator yoke 21 is the same as the arc curvature of the top of the tooth pole 42 and the arc curvature of the second connecting plate 223, so that the tooth pole 42 will not collide with the stator yoke 21 or the second connecting plate 223 when rotating in the middle of the shell 1.

[0056] As an optional embodiment, in a utility model implementation, see Figure 1 As shown, a plurality of fixing holes 11 are provided on the outside of the housing 1 along the circumferential direction. When the brushless DC vector motor of the present invention is used, the motor can be fixed through the fixing holes 11 on the outside of the housing 1 to prevent the motor from shaking and displacement.

[0057] As an optional embodiment, in a utility model implementation, see Figure 1 As shown, the stator teeth 22 are made of cold-stamped silicon steel sheets or low-carbon steel stacked and riveted together. The silicon steel sheets have excellent magnetic permeability and can conduct magnetic fields more effectively, thereby improving the efficiency of power equipment such as motors and transformers. The silicon steel sheets also have low iron loss, easy processing and good mechanical properties, and generate less heat in the magnetic field, which can extend the service life of the equipment and reduce energy consumption.

[0058] The above embodiments are all described with an inner rotor motor. In addition, the motor can also be expanded to an outer rotor motor. The similarities between the inner rotor motor and the outer rotor motor are that the raw materials, structure and electronic controller used are the same. The difference between the inner rotor motor and the outer rotor motor is that the definitions of the stator and the rotor are different, that is, the positions of the coil windings are different. The coil windings of the inner rotor motor are arranged on the stator teeth, while the coil windings of the outer rotor motor are arranged on star-shaped tooth poles formed by stacking and riveting cold-stamped silicon steel sheets into a star-shaped structure. The star-shaped tooth poles generally have 6 teeth (3 phases and 6 poles), 12 teeth (6 phases and 12 poles) or multiples of 6, so that the electronic controllers of the inner rotor motor and the outer rotor motor can be shared, reducing the product R&D cost and production cost.

[0059] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0060] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0061] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather to be construed in the broadest manner consistent with the principles and novel features of the present invention.

Claims

1. A brushless DC vector motor, characterized in that: include: Housing (1); A stator assembly (2), the stator assembly (2) comprising a plurality of stator yokes (21), the plurality of stator yokes (21) being arranged at intervals along a circumferential direction on the inner side of the housing (1), a stator tooth (22) being provided between every two stator yokes (21), and a coil winding (3) being provided on the stator tooth (22); A rotor assembly (4), the rotor assembly (4) being arranged at the center of the stator assembly (2), the rotor assembly (4) being formed by stacking and riveting cold-stamped silicon steel sheets to form a star-shaped structure; When the coil winding (3) is energized, the magnetic field of the stator assembly (2) generates an attractive force to drive the rotor assembly (4) to rotate.

2. The brushless DC vector motor according to claim 1, characterized in that: The stator teeth (22) include: a first connecting plate (221), the first connecting plate (221) being embedded between the two stator yokes (21), the first connecting plate (221) being an arc-shaped structure and matching the housing (1); A connecting column (222), the connecting column (222) is arranged in the middle of the first connecting plate (221), and both sides of the connecting column (222) are winding grooves (2221); A second connecting plate (223) is provided at the other end of the connecting column (222), and the second connecting plate (223) is also an arc-shaped structure.

3. The brushless DC vector motor according to claim 2, wherein: The stator teeth (22) are of an I-shaped structure, and the length of the first connecting plate (221) is longer than that of the second connecting plate (223).

4. The brushless DC vector motor according to claim 3, characterized in that: A connection hole is correspondingly provided on one side of the first connection plate (221) and the second connection plate (223) for connection with the housing (1).

5. The brushless DC vector motor according to claim 2, characterized in that: The rotor assembly (4) comprises: Rotating shaft (41); A plurality of tooth poles (42) are arranged outside the rotating shaft (41) at intervals along the circumferential direction, and each of the tooth poles (42) protrudes from the rotating shaft (41) and extends to the front of the stator yoke (21).

6. The brushless DC vector motor according to claim 5, characterized in that: The top end of each tooth pole (42) is an arc-shaped structure and matches the second connecting plate (223).

7. The brushless DC vector motor according to claim 5, characterized in that: The number of the tooth poles (42) and the number of the stator yoke (21) are both even.

8. The brushless DC vector motor according to claim 5, characterized in that: The stator yoke (21) is a convex structure, a groove (211) is provided on a side of the stator yoke (21) close to the housing (1), and a side of the stator yoke (21) away from the housing (1) is an arc-shaped structure and matches the top end of the tooth pole (42).

9. The brushless DC vector motor according to claim 1, characterized in that: The exterior of the housing (1) is provided with a plurality of fixing holes (11) along the circumferential direction.

10. The brushless DC vector motor according to claim 1, characterized in that: The stator teeth (22) are made of cold-punched silicon steel sheets or low-carbon steel sheets that are stacked and riveted.

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