WO2017008704A1 - Brushless direct current motor - Google Patents

Brushless direct current motor Download PDF

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Publication number
WO2017008704A1
WO2017008704A1 PCT/CN2016/089426 CN2016089426W WO2017008704A1 WO 2017008704 A1 WO2017008704 A1 WO 2017008704A1 CN 2016089426 W CN2016089426 W CN 2016089426W WO 2017008704 A1 WO2017008704 A1 WO 2017008704A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron core
motor shaft
stator iron
rotor
along
Prior art date
Application number
PCT/CN2016/089426
Other languages
French (fr)
Inventor
Wingkin WU
Original Assignee
Wu Wingkin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wu Wingkin filed Critical Wu Wingkin
Publication of WO2017008704A1 publication Critical patent/WO2017008704A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices

Definitions

  • the present application relates to a brushless direct current motor, and more particularly, to the internal structure of a brushless direct current motor.
  • embodiments in the present application provides an improved brushless motor structure which can produce additional magnetic circuit and increase the efficiency of the permanent magnetic materials within the limited space of motor structure so as to improve the motor efficiency.
  • One aspect of the present application provides a brushless direct current motor
  • the rotor includes a rotor iron core and a magnet mounted to the rotor iron core and the rotor is capable of rotating along with the motor shaft relative to the stator iron core.
  • the magnet exciting coil is separated from the stator iron core by an air gap along at least one direction.
  • the magnet exciting coil is separated from the stator iron core by an air gap along an axial direction of the motor shaft.
  • the length of the magnet exciting coil along the axial direction of the motor shaft is 33 mm, and the length of the stator iron core along the axial length of the motor shaft is 20 mm.
  • the magnet exciting coil is separated from the stator coil by the air gap along a circumferential direction surrounding the motor shaft.
  • the ratio of length of the rotor iron core along the axial direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is between 1.05 and 1.2.
  • the length of the rotor iron core along the axial direction of the motor shaft is 22 mm, and the length of the stator iron core along the axial length of the motor shaft is 20 mm.
  • the design for the direct current brushless motor in the present invention provides many advantages as compared to traditional brushless motors.
  • the brushless motor in the present invention adopts a special stator design and improves the magnetic circuit based on a motor structure with a small form factor, which allows the magnet exciting coil to protrude from the stator iron core and the permanent magnetic prolonging from the rotor to form an additional radial magnet field without increasing the size of the brushless motor (namely the motor casing is not enlarged) so as to increase the use efficiency of the permanent magnet, and it further achieves the purpose of improving the motor efficiency without modifying the remained parts of the motor (such as the size and the current).
  • the properties and advantages of the present invention can be further understood by referring to the remained parts and figures of the present specification; the same component in the figures share the same the markers.
  • the sub marker is placed behind the marker and hyphen to represent a component among many resembled ones.
  • a certain marker does not specify one sub marker that already exists, it means all the resembled components.
  • Figure 1 shows the radial cross-section schematic diagram for the structure of the stator and the rotor of the brushless direct current motor in the first embodiment of the present invention.
  • Figure 2 shows the cross-sectional diagram along the axial direction of the brushless direct current motor in Figure 1.
  • Figure 3 shows the schematic diagram for the property comparison between the brushless direct current motor in the embodiment in the present invention and the brushless direct current motor in the prior art.
  • the brushless direct current motor contains a substantially cylindrical motor casing 24 (only part of the structure is shown). Inside of the motor casing 24, there are contained multiple stator iron cores 28, a magnet exciting coil 20 winded to the stator iron cores 28, a motor shaft 22 and a rotor mounted to the motor shaft.
  • the stator iron core 28 is an iron core formed by laminating the silicon steel sheet.
  • the rotor contains a rotor iron core 28 and a magnet (not shown) mounted to the rotor iron core.
  • the rotor magnet is a permanent magnet which can be contained within the groove formed inside the rotor iron core 26 or mounted to the periphery of the rotor iron core 26.
  • the rotor iron core 26 and the magnet can rotate together along with the motor shaft 22 and this kind of rotation is relative to the stator iron core 28 and the magnet exciting coil 20.
  • the magnet exciting coil winded to the stator iron core is separated from the stator iron core by an air gap along at least one direction.
  • the magnet exciting coil 20 does not closely surround or wrap the stator iron core 28.
  • the magnet exciting coil 20 protrudes from the stator iron core 28 along the longitudinal direction of the motor shaft 22.
  • at least one part of the magnet exciting coil 20 is separated from the lateral surface of the corresponding stator iron core 28, and air is present between the two.
  • the structure allows the part of the magnet exciting coil 20 protruding from the stator iron core 28 to produce a small amount of radial magnetic field.
  • the additional radial magnet field functions with the stator magnet so as to increase additional magnet circuit and further produce better properties under the same conditions (such as motor sizes, current and so forth).
  • the ratio of the length of the magnet exciting coil 20 along the axial direction of the motor shaft 22 to the length of the stator iron core 28 along the axial direction of the motor shaft 22 is preferably between 1.4 and 1.7.
  • the length of the magnet exciting coil 20 along the axial direction is shown as length 21.
  • the length of the stator iron core 28 along the axial direction of the motor shaft is shown as length 23.
  • the length 21 of the magnet exciting coil 20 along the axial direction is 33 mm while the length of the stator iron core 28 along the axial direction is 20 mm.
  • the axial lengths of the rotor iron core 26 and the magnet are also designed as being different from the axial length of the stator iron core 28.
  • the axial lengths of the rotor iron core 26 and the magnet are slightly larger than the axial length of the stator iron core 28.
  • the axial lengths of the rotor iron core 26 and the magnet are shown as length 25.
  • the ratio of the lengths of the rotor iron core 26 and the magnet along the axial direction of the motor shaft 22 to the axial length of the stator iron core 28 is between 1.05 and 1.2.
  • the ratio of the lengths of the rotor iron core 26 and the magnet along the axial direction of the motor shaft 22 to the axial length of the stator iron core 28 is 1.1. In another specific embodiment, the lengths of the rotor iron core 26 and the magnet along the axial direction of the motor shaft 22 are 22 mm while the axial length of the stator iron core 28 is 20 mm. Since the part of the magnet exciting coil that is higher than the stator iron core still produces a small amount of radial magnetic field, under this condition, the axial length of the rotor iron core is slightly longer than the stator iron core, such that they can form a magnet circuit with the radial magnet field of the protruded part in the coil, and it further improves the motor efficiency.
  • Figure 2 shows the structure of the brushless motor in another embodiment of the present invention.
  • Figure 2 demonstrates the cross- sectional situation of the motor observed along the direction of the motor shaft 122.
  • the magnet exciting coil 120 does not wrap and surround the stator iron core 128 closely along the circumferential direction surrounding the motor shaft 122, namely the circumferential direction inside the motor casing (not shown) as well.
  • the magnet exciting coil 120 also protrudes from the stator iron core 128 along the circumferential direction and an air gap exists between the two.
  • This kind of design further increases the radial magnet field produced by the magnet exciting coil and cooperate with the magnet on the rotor iron core 126 so as to increase the use efficiency of the permanent magnet materials and further increase the motor efficiency.
  • FIG. 3 shows the energy consumption comparison diagram of the brushless motor according to the present invention and the traditional brushless motor under the same rotation speed (represented as rpm) when the ratios of the length of the rotor iron core and the magnet along the axial direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is 1.1. It can be seen that the energy consumption of the brushless motor in the present invention represented by curve 30 is lower than that of the brushless motor in the prior art represented by curve 32 in each intervals of the revolutions. In other words, the revolutions produced by the brushless direction current motor in the present invention is greater than that produced by the traditional brushless direct current motor, which means it possesses more excellent properties.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Brushless Motors (AREA)

Abstract

A brushless direct current motor comprising a stator iron core (28), a magnet exciting coil (20) winded to the stator iron core (28), a motor shaft (22) and a rotor mounted to the motor shaft (22), the rotor comprises a rotor iron core (26) and a magnet mounted to the rotor iron core (26) and wherein the rotor can rotate against the stator iron core (28) along the motor shaft (22). The magnet exciting coil (20) is separated from the stator iron core (28) by an air gap along at least one direction. The magnet exciting coil (20) protruding form the stator iron core (28) and the permanent magnet prolonging on the rotor in the brushless motor form a new radial magnet field, hence it increases the use efficiency of the permanent magnet and further reaches the purpose of improving the motor efficiency.

Description

Description
Title of Invention: Brushless Direct Current Motor
Technical Field
[0001] The present application relates to a brushless direct current motor, and more particularly, to the internal structure of a brushless direct current motor.
[0002] Background of the invention
[0003] With the increasing development and prevalence of brushless direct current motors, more and more domestic portable electric appliances start to adopt brushless direct current motors for replacement of traditional brushed motors. As the brushless motors abandon structures such as the brush and the commutator, their form factors become smaller. Meanwhile, since the brush is replaced by an external controller in the brushless motor so as to accurately control the motor rotation and the current commutation, the lifespan of brushless motor is longer and its performance is better.
[0004] However, there is still a need to further improve the properties of brushless direct current motor based on the traditional brushless direct current motor, such as the need to explore how to increase the magnetic density and improve properties of the motor within a limited space.
[0005] Summary of the invention
[0006] In order to overcome the above-mentioned technical problem, embodiments in the present application provides an improved brushless motor structure which can produce additional magnetic circuit and increase the efficiency of the permanent magnetic materials within the limited space of motor structure so as to improve the motor efficiency.
[0007] One aspect of the present application provides a brushless direct current motor
containing a stator iron core, a magnet exciting coil winded to the stator iron core, a motor shaft and a rotor mounted on the motor shaft. The rotor includes a rotor iron core and a magnet mounted to the rotor iron core and the rotor is capable of rotating along with the motor shaft relative to the stator iron core. The magnet exciting coil is separated from the stator iron core by an air gap along at least one direction.
[0008] Preferably, the magnet exciting coil is separated from the stator iron core by an air gap along an axial direction of the motor shaft.
[0009] More preferably, the ratio of length of the magnet exciting coil along the axial
direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is between 1.4 and 1.7.
[0010] In one specific embodiment, the length of the magnet exciting coil along the axial direction of the motor shaft is 33 mm, and the length of the stator iron core along the axial length of the motor shaft is 20 mm. [0011] In a modified embodiment, the magnet exciting coil is separated from the stator coil by the air gap along a circumferential direction surrounding the motor shaft.
[0012] Preferably, the ratio of length of the rotor iron core along the axial direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is between 1.05 and 1.2.
[0013] More preferably, the length of the rotor iron core along the axial direction of the motor shaft is 22 mm, and the length of the stator iron core along the axial length of the motor shaft is 20 mm.
[0014] Therefore, the design for the direct current brushless motor in the present invention provides many advantages as compared to traditional brushless motors. The brushless motor in the present invention adopts a special stator design and improves the magnetic circuit based on a motor structure with a small form factor, which allows the magnet exciting coil to protrude from the stator iron core and the permanent magnetic prolonging from the rotor to form an additional radial magnet field without increasing the size of the brushless motor (namely the motor casing is not enlarged) so as to increase the use efficiency of the permanent magnet, and it further achieves the purpose of improving the motor efficiency without modifying the remained parts of the motor (such as the size and the current).
[0015] Description of figures
[0016] The properties and advantages of the present invention can be further understood by referring to the remained parts and figures of the present specification; the same component in the figures share the same the markers. Under certain circumstances, the sub marker is placed behind the marker and hyphen to represent a component among many resembled ones. When a certain marker does not specify one sub marker that already exists, it means all the resembled components.
[0017] Figure 1 shows the radial cross-section schematic diagram for the structure of the stator and the rotor of the brushless direct current motor in the first embodiment of the present invention.
[0018] Figure 2 shows the cross-sectional diagram along the axial direction of the brushless direct current motor in Figure 1.
[0019] Figure 3 shows the schematic diagram for the property comparison between the brushless direct current motor in the embodiment in the present invention and the brushless direct current motor in the prior art.
[0020] Detailed Descriptions of Specific embodiments
[0021] Embodiments in the present invention improve the property of the motor by axially increasing the length of the magnet exciting coil so as to produce additional radial magnetic field. Other merits and advantages provided by each embodiments of the present invention can be easily known from the following descriptions. [0022] Now referring to Figure 1, the brushless direct current motor according to one embodiment of the present invention contains a substantially cylindrical motor casing 24 (only part of the structure is shown). Inside of the motor casing 24, there are contained multiple stator iron cores 28, a magnet exciting coil 20 winded to the stator iron cores 28, a motor shaft 22 and a rotor mounted to the motor shaft. As known by those skilled in the art, the stator iron core 28 is an iron core formed by laminating the silicon steel sheet. The rotor contains a rotor iron core 28 and a magnet (not shown) mounted to the rotor iron core. As known by those skilled in the art, the rotor magnet is a permanent magnet which can be contained within the groove formed inside the rotor iron core 26 or mounted to the periphery of the rotor iron core 26. The rotor iron core 26 and the magnet can rotate together along with the motor shaft 22 and this kind of rotation is relative to the stator iron core 28 and the magnet exciting coil 20.
[0023] In the present invention, the magnet exciting coil winded to the stator iron core is separated from the stator iron core by an air gap along at least one direction. In Figure 1, it can be seen that the magnet exciting coil 20 does not closely surround or wrap the stator iron core 28. On the contrary, the magnet exciting coil 20 protrudes from the stator iron core 28 along the longitudinal direction of the motor shaft 22. In other words, at least one part of the magnet exciting coil 20 is separated from the lateral surface of the corresponding stator iron core 28, and air is present between the two. The structure allows the part of the magnet exciting coil 20 protruding from the stator iron core 28 to produce a small amount of radial magnetic field. The additional radial magnet field functions with the stator magnet so as to increase additional magnet circuit and further produce better properties under the same conditions (such as motor sizes, current and so forth). The ratio of the length of the magnet exciting coil 20 along the axial direction of the motor shaft 22 to the length of the stator iron core 28 along the axial direction of the motor shaft 22 is preferably between 1.4 and 1.7. Among them, in Figure 1, the length of the magnet exciting coil 20 along the axial direction is shown as length 21. The length of the stator iron core 28 along the axial direction of the motor shaft is shown as length 23. In one specific embodiment, the length 21 of the magnet exciting coil 20 along the axial direction is 33 mm while the length of the stator iron core 28 along the axial direction is 20 mm.
[0024] In order to better function the efficiency of the additional radial magnetic field
produced by the protruded magnet exciting coil 20, as shown in Figure 1, the axial lengths of the rotor iron core 26 and the magnet (not shown) are also designed as being different from the axial length of the stator iron core 28. As shown by Figure 1, the axial lengths of the rotor iron core 26 and the magnet are slightly larger than the axial length of the stator iron core 28. In Figure 1, the axial lengths of the rotor iron core 26 and the magnet are shown as length 25. The ratio of the lengths of the rotor iron core 26 and the magnet along the axial direction of the motor shaft 22 to the axial length of the stator iron core 28 is between 1.05 and 1.2. In one specific embodiment, the ratio of the lengths of the rotor iron core 26 and the magnet along the axial direction of the motor shaft 22 to the axial length of the stator iron core 28 is 1.1. In another specific embodiment, the lengths of the rotor iron core 26 and the magnet along the axial direction of the motor shaft 22 are 22 mm while the axial length of the stator iron core 28 is 20 mm. Since the part of the magnet exciting coil that is higher than the stator iron core still produces a small amount of radial magnetic field, under this condition, the axial length of the rotor iron core is slightly longer than the stator iron core, such that they can form a magnet circuit with the radial magnet field of the protruded part in the coil, and it further improves the motor efficiency.
[0025] Figure 2 shows the structure of the brushless motor in another embodiment of the present invention. Figure 2 demonstrates the cross- sectional situation of the motor observed along the direction of the motor shaft 122. It can be seen that the magnet exciting coil 120 does not wrap and surround the stator iron core 128 closely along the circumferential direction surrounding the motor shaft 122, namely the circumferential direction inside the motor casing (not shown) as well. On the contrary, the magnet exciting coil 120 also protrudes from the stator iron core 128 along the circumferential direction and an air gap exists between the two. This kind of design further increases the radial magnet field produced by the magnet exciting coil and cooperate with the magnet on the rotor iron core 126 so as to increase the use efficiency of the permanent magnet materials and further increase the motor efficiency.
[0026] Figure 3 shows the energy consumption comparison diagram of the brushless motor according to the present invention and the traditional brushless motor under the same rotation speed (represented as rpm) when the ratios of the length of the rotor iron core and the magnet along the axial direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is 1.1. It can be seen that the energy consumption of the brushless motor in the present invention represented by curve 30 is lower than that of the brushless motor in the prior art represented by curve 32 in each intervals of the revolutions. In other words, the revolutions produced by the brushless direction current motor in the present invention is greater than that produced by the traditional brushless direct current motor, which means it possesses more excellent properties.
[0027] Therefore, after introducing several embodiments, those skilled in the art can know that different modifications, other structures and equivalents can all be used without departing from the essence of the present invention. Correspondingly, the above- mentioned descriptions should not be regarded as the limitations to the scope of the present invention ascertained by the following claims. Technical Problem
Solution to Problem
Advantageous Effects of Invention

Claims

Claims
A brushless direct current motor, comprising a stator iron core, a magnet exciting coil winded to the stator iron core, a motor shaft and a rotor mounted on the motor shaft, the rotor comprising a rotor iron core and a magnet mounted to the rotor iron core, wherein the rotor is capable of rotating along with the motor shaft relative to the stator iron core, characterized in that:
the magnet exciting coil is separated from the stator iron core by an air gap along at least one direction.
The brushless direct current motor according to claim 1, wherein the magnet exciting coil is separated from the stator iron core by the air gap along an axial direction of the motor shaft.
The brushless direct current motor according to claim 2, wherein the ratio of the length of the magnet exciting coil along the axial direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is between 1.4 and 1.7.
The brushless direct current motor according to claim 3, wherein the length of the magnet exciting coil along the axial direction of the motor shaft is 33 mm, and the length of the stator iron core along the axial direction of the motor shaft is 20 mm.
The brushless direct current motor according to claim 1, wherein the magnet exciting coil is separated from the stator iron core by the air gap along a circumferential direction surrounding the motor shaft.
The brushless direct current motor according to any one of the preceding claims, wherein the ratio of the length of the rotor iron core along the axial direction of the motor shaft to the length of the stator iron core along the axial direction of the motor shaft is between 1.05 and 1.2.
The brushless direct current motor according to claim 6, wherein the length of the rotor iron core along the axial direction of the motor shaft is 22 mm, and the length of the stator iron core along the axial direction of the motor shaft is 20 mm.
PCT/CN2016/089426 2015-07-10 2016-07-08 Brushless direct current motor WO2017008704A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510405037.7 2015-07-10
CN201510405037.7A CN106329787A (en) 2015-07-10 2015-07-10 Brushless direct current motor

Publications (1)

Publication Number Publication Date
WO2017008704A1 true WO2017008704A1 (en) 2017-01-19

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Application Number Title Priority Date Filing Date
PCT/CN2016/089426 WO2017008704A1 (en) 2015-07-10 2016-07-08 Brushless direct current motor

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WO (1) WO2017008704A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518840A (en) * 2019-08-29 2019-11-29 沈阳工业大学 A kind of control system without position sensor and method of CAR-BLDCM
CN110601400A (en) * 2019-09-18 2019-12-20 深圳市泉胜精密科技有限公司 Oil immersion type integrated permanent magnet brushless direct current motor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350464A (en) * 2019-08-06 2021-02-09 江苏美的清洁电器股份有限公司 Stator core, stator and motor

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JPS54150612A (en) * 1978-05-19 1979-11-27 Hitachi Ltd Protective device of winding end of yard linear motor
JPH10304641A (en) * 1997-04-22 1998-11-13 Hitachi Ltd Elevator device
JP2004236376A (en) * 2003-01-28 2004-08-19 Nissan Motor Co Ltd Internal cooling type motor
CN1933300A (en) * 2006-08-14 2007-03-21 南京航空航天大学 Electric exciting brushless synchronous machine
CN201994799U (en) * 2011-03-10 2011-09-28 高林发 Two-in-one coaxial direct-current (DC) brushless motor
US20120326555A1 (en) * 2011-06-24 2012-12-27 Fanuc Corporation Electric motor having sleeve mounted to rotary shaft with high precision
CN204928407U (en) * 2015-07-10 2015-12-30 胡永健 Brushless dc motor

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EP2166645B1 (en) * 2008-09-18 2012-12-12 Siemens Aktiengesellschaft Group of three stator windings for a stator of an electric machine, a stator arrangement, a generator, and wind turbine

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Publication number Priority date Publication date Assignee Title
JPS54150612A (en) * 1978-05-19 1979-11-27 Hitachi Ltd Protective device of winding end of yard linear motor
JPH10304641A (en) * 1997-04-22 1998-11-13 Hitachi Ltd Elevator device
JP2004236376A (en) * 2003-01-28 2004-08-19 Nissan Motor Co Ltd Internal cooling type motor
CN1933300A (en) * 2006-08-14 2007-03-21 南京航空航天大学 Electric exciting brushless synchronous machine
CN201994799U (en) * 2011-03-10 2011-09-28 高林发 Two-in-one coaxial direct-current (DC) brushless motor
US20120326555A1 (en) * 2011-06-24 2012-12-27 Fanuc Corporation Electric motor having sleeve mounted to rotary shaft with high precision
CN204928407U (en) * 2015-07-10 2015-12-30 胡永健 Brushless dc motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518840A (en) * 2019-08-29 2019-11-29 沈阳工业大学 A kind of control system without position sensor and method of CAR-BLDCM
CN110518840B (en) * 2019-08-29 2021-06-11 沈阳工业大学 Position-sensor-free control system and method of CAR-BLDCM
CN110601400A (en) * 2019-09-18 2019-12-20 深圳市泉胜精密科技有限公司 Oil immersion type integrated permanent magnet brushless direct current motor

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