CN112104179A - Permanent magnet motor - Google Patents
Permanent magnet motor Download PDFInfo
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- CN112104179A CN112104179A CN201910519338.0A CN201910519338A CN112104179A CN 112104179 A CN112104179 A CN 112104179A CN 201910519338 A CN201910519338 A CN 201910519338A CN 112104179 A CN112104179 A CN 112104179A
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- circuit ring
- short circuit
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Classifications
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- 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
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
Abstract
The invention relates to a permanent magnet motor, comprising: the permanent magnet motor comprises a motor rotor mandrel, permanent magnets, a rotor core, a stator core, a working air gap formed between the rotor core and the stator core, a winding, a motor end cover, a motor bearing, a motor shell and a groove which is arranged on the rotor core and used for installing the permanent magnets, wherein a pair of static conductive short circuit rings are installed at the end part of the permanent magnet motor close to the rotor core. The inner wall of the motor shell is provided with a fixed rod, and the conductive short-circuit ring is installed on the fixed rod through a mounting hole by utilizing a bolt. By using the conductive short circuit ring 7, the end magnetic leakage effect of the permanent magnet motor can be obviously reduced, so that the effective magnetic field in the working air gap of the motor is improved, the electric efficiency of the permanent magnet motor is improved, and the electromagnetic radiation of the permanent magnet motor to the environment is greatly reduced.
Description
Technical Field
The invention relates to a permanent magnet motor, in particular to a permanent magnet motor capable of inhibiting the damage of magnetic flux leakage of a rotor.
Background
An electric machine based on the principle of electromagnetic induction comprises an electric motor, which is a device for converting electrical energy into mechanical energy, and a generator, which is a device for converting mechanical energy into electrical energy. In the motor, in order to realize the conversion between the electric energy and the mechanical energy, the dynamic magnetic interaction is formed between a stator and a rotor of the motor. For example: three-phase alternating current is input into the stator, so that a rotary dynamic magnetic field can be formed in the stator. The rotating magnetic field interacts with an alternating magnetic field formed in the rotor at the same time, so that the rotor can be driven to rotate. In order to realize the alternating magnetic field formed in the rotor, a so-called excitation current must be simultaneously supplied to the rotor windings. For a permanent magnet machine, the alternating magnetic field of the rotor may be provided directly by permanent magnets arranged in an N-S-N. In this way, the consumption of field current in the rotor is saved. Therefore, the permanent magnet motor has the remarkable energy-saving characteristic. Also, since the permanent magnet has a constant magnetic potential, the permanent magnet motor has a greater advantage than the electrically excited motor in terms of conversion efficiency between electrical energy and mechanical energy. On the other hand, because the modern sintered Nd-Fe-B magnet has very high magnetic energy density, under the same power, compared with the conventional motor which forms an excitation magnetic field by a current-carrying winding, the permanent magnet motor also has the advantages of small volume and light weight. As is well known, the motor is the "heart" of modern electrical society. Nowadays, permanent magnet motors are widely applied to various industrial and civil mechanical equipment, wind power generation, solar power generation, automobiles, industrial automation equipment, various household appliances such as air conditioners, refrigerators, washing machines and the like, and become an indispensable part of national economy and people's lives.
The types of permanent magnet motors suitable for various different purposes are various, and the permanent magnet motors are generally divided into a rotary type permanent magnet motor and a linear type permanent magnet motor. Among them, the rotary permanent magnet motor is most widely used. The permanent magnets are classified into surface-mount type, inner-mount type and disc type according to their arrangement in the rotary electric machine. Fig. 1 is a cross-sectional view of a general surface-mounted permanent magnet motor, and fig. 2 is a longitudinal-sectional view of a general surface-mounted permanent magnet motor, in which two pairs of permanent magnets 2 are mounted on an outer surface of a rotor core 3 in an N-S pole staggered symmetrical manner, form a magnetic circuit with a coaxially disposed stator core 4, and generate an excitation magnetic field in an air gap 5 between a stator and a rotor. In fig. 1, N denotes the north pole of the permanent magnet, and S denotes the south pole of the permanent magnet. When the permanent magnet 2 rotates along with the rotor, the winding 6 embedded in the stator core 4 generates induced electromotive force due to cutting of magnetic lines of force, and current can be output outwards. The mechanical energy applied to the rotor is thus converted into electrical energy that can be output by the windings 6, which is the operating principle of a permanent magnet generator. Conversely, if a three-phase alternating current is input to the winding 6, the current will generate a rotating magnetic field, which interacts with the permanent magnet 2 to drive the rotor to rotate, and output a mechanical torque to the outside. In other words, the electrical energy applied in the windings 6 is converted into mechanical energy that can be output by the rotor, which is the operating principle of a permanent magnet motor. Therefore, in the following description of the present invention, the working principle of the permanent magnet motor is described, and the working principle of the permanent magnet generator is also described. Unless otherwise specified, the permanent magnet electric machine according to the present invention includes both a permanent magnet electric motor and a permanent magnet generator.
In fig. 1, permanent magnets 2 are mounted on the outer surface of a rotor core 3, which is commonly referred to as a surface-mount permanent magnet motor. Since the rotor is located within the cavity of the stator, it is also referred to as an inner rotor type permanent magnet machine. Obviously, if the rotor core is made into a ring shape, the stator embedded with the winding is coaxially arranged in the rotor cavity, and the permanent magnet can also be arranged on the inner surface of the rotor; a motor using such a structure is called an outer rotor type permanent magnet motor. At present, such an outer rotor motor has been widely used for wind power generation. It is apparent that the outer rotor type permanent magnet motor operates on the same principle as the inner rotor type permanent magnet motor. Therefore, in the following description of the present invention, the operation principle of the inner rotor type permanent magnet motor is described, and the operation principle of the outer rotor type permanent magnet motor is also described, and the permanent magnet motor according to the present invention includes both the inner rotor type permanent magnet motor and the outer rotor type permanent magnet motor, unless otherwise specified.
Fig. 3 is a cross-sectional view of a general interior permanent magnet motor, in which a rotor core 3 has slots 12 formed therein parallel to the axial direction, and permanent magnets 2 are mounted in the slots 12. The lateral dimension of the slot 12 needs to be slightly larger than the width of the permanent magnet 2, so that a certain gap exists between two non-polar surfaces of the permanent magnet 2 and two side surfaces of the slot 12, and the utilization efficiency of the magnetic flux of the permanent magnet 2 is improved. The operating magnetic field in the air gap 5 is likewise generated by the magnetic circuit formed by the permanent magnets 2 with the rotor core 3 and the stator core 4. Obviously, the working principle of the interpolation type permanent magnet motor is the same as that of the surface-mounted type permanent magnet motor. Therefore, in the following description of the present invention, the operation principle of the surface-mounted permanent magnet motor is described, and the operation principle of the interior-mounted permanent magnet motor is also described. Unless otherwise specified, the permanent magnet motor of the present invention includes both surface-mount permanent magnet motors and interior-mount permanent magnet motors.
End leakage flux is common in general permanent magnet motor technology. The magnetic leakage rate is related to the diameter height ratio of the permanent magnet motor rotor: the larger the diameter of the rotor is, the shorter the shaft length is, and the larger the magnetic leakage rate is; conversely, the smaller the diameter of the rotor, the longer the axial length, and the smaller the magnetic leakage rate. According to the difference of the diameter-height ratio of the permanent magnet motor, the magnetic leakage rate can generally reach 5% -30%. Obviously, the end leakage of the permanent magnet motor firstly causes the reduction of the motor efficiency; secondly, because the end leakage flux of the rotor of the permanent magnet motor rotates along with the rotor, the electromagnetic induction law shows that the end leakage magnetic field doing rotary motion can be cut by an end cover, a flange and the like of the motor to form induced current, obvious loss and heat are generated, the motor is heated and fails, and the maintenance cost is increased; especially, when the permanent magnet motor is applied to environment-sensitive high-power permanent magnet motors in the fields of mines, foods, pharmacy, chemical industry and the like, the end leakage magnetic field which rotates can form strong electromagnetic radiation to the surrounding environment, and safety accidents such as fire, even explosion and the like are easily caused.
According to faraday's law of electromagnetic induction:
＝-dΦ/dt (1)
the formula represents induced electromotive force, Φ represents magnetic flux, and t is time. It can be seen that the greater the rate of change of the magnetic flux, the greater the induced electromotive force. Therefore, the larger the rotation speed of the motor, the larger the end leakage loss, and the stronger the electromagnetic radiation to the outside by the end leakage.
Disclosure of Invention
The inventor of the present invention finds, through research, that if a stationary conductive short-circuit ring 7 is disposed at a position close to a rotor at a stator end cover, according to formula (1), a leakage magnetic field at an end of the rotor in a rotating motion sweeps over the stationary conductive short-circuit ring 7, so that a reverse induced current is generated in the conductive short-circuit ring 7, and the reverse induced current, that is, an eddy current, has an effect of inhibiting the leakage magnetic field from crossing over the conductive short-circuit ring 7, that is, an induced magnetic field having a direction opposite to that of the leakage magnetic field of the rotor is generated in the conductive short-circuit ring 7; as the rotation speed of the motor rotor increases, the rate of change of the leakage magnetic field increases, and the reverse induction magnetic field generated in the conductive short ring 7 increases, so that the leakage magnetic flux is pushed back into the working air gap. Fig. 5a is a schematic diagram of the end leakage flux state of the permanent magnet motor calculated by using a finite element method, wherein a strong leakage flux line 13 exists at the end of the permanent magnet motor. Fig. 5b is a schematic view of the end leakage flux state of the permanent magnet machine after the stationary electrically conductive short circuit ring 7 has been provided, wherein the leakage flux 13 at the end of the permanent magnet machine is significantly suppressed. It is clear from this that the end leakage effect is greatly reduced by mounting the conductive short ring 7 of the present invention. The effective magnetic field in the working air gap 5 of the permanent magnet motor is obviously improved, the motor obtains higher electric efficiency, and a plurality of adverse effects caused by end magnetic flux leakage are greatly reduced.
Therefore, on the premise that the rated power of the permanent magnet motor is the same, the conductive short-circuit ring 7 can obtain higher output efficiency, which means that the purpose of saving electric energy can be achieved by using the conductive short-circuit ring 7; especially for a high-power permanent magnet motor, the conductive short-circuit ring 7 can obviously save the electricity cost, greatly improve the operation safety, reduce the end heating fault caused by magnetic leakage loss and reduce the maintenance cost.
The technical scheme of the invention is as follows: a permanent magnet electric machine comprising: the permanent magnet motor comprises a motor rotor mandrel 1, a permanent magnet 2, a rotor core 3, a stator core 4, a working air gap 5 formed between the rotor core and the stator core, a winding 6, a motor end cover 8, a motor bearing 9, a motor shell 10 and a slot 12 which is arranged on the rotor core and used for mounting the permanent magnet, and is characterized in that a pair of static conductive short circuit rings 7 is mounted at the end part of the permanent magnet motor close to the rotor core. The inner wall of the motor housing is provided with a fixing rod 16, and the conductive short circuit ring 7 is mounted on the fixing rod 16 through the mounting hole 15 by means of the bolt 11.
Preferably, the outer diameter of the conductive short circuit ring 7 is larger than the outer diameter of the motor working air gap 5 and smaller than the outer diameter of the stator core 4, and the inner diameter of the conductive short circuit ring 7 is larger than the outer diameter of the rotor spindle 1 and smaller than the inner diameter of the motor working air gap 5.
Preferably, a plurality of circulation holes 14 are axially arranged on the annular wall of the conductive short-circuit ring 7, and the skin effect of the eddy current is utilized to make the reverse magnetic field on the conductive ring concentrate near the circulation holes 14, so that the effect of inhibiting the leakage flux of the rotor can be further improved, and the ventilation and heat dissipation effects are achieved.
Preferably, the annular flow holes 14 are circular, scalloped, rectangular, or other easily machined shapes.
Preferably, the conductive short ring 7 is made of a material having high conductivity, such as copper, aluminum, silver, graphite, or a composite of these materials.
Preferably, the conductive short circuit ring 7 is formed by stacking a plurality of layers of sheet-like conductive materials, which has a better effect of suppressing leakage flux of the rotor.
The conductive short-circuit ring 7 of the invention is a static short-circuit ring which is arranged at the position close to the end part of the rotor and plays an effective inhibiting role on the end part leakage magnetic flux of the dynamic rotor; the traditional squirrel-cage rotor end ring rotates along with the rotor and does not play any role in restraining end leakage magnetic flux. The technique of the present invention is thus completely different from conventional squirrel cage rotor end rings.
It should be noted that, the permanent magnet motors in various forms in the prior art have different degrees of end leakage, and the existing technology for reducing end leakage is to form holes with different shapes in the axial direction at specific parts of the rotor core or the stator core, and guide magnetic lines of force by using the principle that the magnetic resistance of air in the holes is far greater than that of silicon steel sheets, so as to reduce leakage, which is the so-called "magnetic isolation bridge" and "magnetic isolation hole" method in the prior art, as described in CN 104917350A, CN 104868624A, CN 107070154A, CN 104821700a and the like. The methods not only need to increase the manufacturing cost of the die for punching the silicon steel sheet, but also have weak effect on inhibiting the end leakage of the permanent magnet motor, particularly the end leakage of the permanent magnet motor in a high-speed running state, and further cannot inhibit the electromagnetic radiation to the external environment generated by the dynamic end leakage.
By using the conductive short circuit ring 7, the end magnetic leakage effect of the permanent magnet motor can be obviously reduced, and the effective magnetic field in the working air gap of the motor is further improved. The motor achieves the purposes of higher electric efficiency and electric energy saving; meanwhile, a plurality of adverse effects caused by end magnetic leakage, such as end heating, low electric efficiency and the like, are greatly reduced. Especially for high-power permanent magnet motors applied to the industries such as mines, foods, pharmacy, chemical engineering and the like, the conductive short circuit ring 7 of the invention can not only obviously save the electricity cost, but also greatly improve the operation safety: the safety accidents such as fire, explosion and the like which are possibly caused by strong electromagnetic radiation generated by the magnetic leakage of the end part of the motor are eliminated, and meanwhile, the heating faults of the motor generated by the magnetic leakage loss are reduced, and the maintenance cost is reduced. The higher the rotation speed of the motor is, the more remarkable the effect of the present invention on suppression of leakage magnetic flux.
Drawings
FIG. 1 is a schematic vertical-axis cross-sectional view of a typical surface-mount permanent magnet machine;
fig. 2 is a schematic axial sectional view of a typical surface-mount permanent magnet motor;
FIG. 3 is a schematic vertical axis cross-sectional view of a typical internal permanent magnet machine;
fig. 4a is a schematic axial cross-sectional view and a schematic vertical axial cross-sectional view of a conductive shorting ring according to a first embodiment of the present invention;
fig. 4b is a schematic axial cross-sectional view and a schematic vertical axial cross-sectional view of a conductive shorting ring according to a second embodiment of the present invention;
fig. 4c is a schematic axial cross-sectional view and a schematic vertical axial cross-sectional view of a conductive shorting ring according to a third embodiment of the present invention;
fig. 4d is a schematic axial cross-sectional view of a conductive shorting ring according to a fourth embodiment of the present invention;
FIG. 5a is a schematic diagram of the leakage flux at the end of the permanent magnet motor;
FIG. 5b is a schematic diagram of the leakage flux at the end of the permanent magnet motor after being affected by the conductive short-circuit ring;
fig. 6 is a general schematic axial sectional view of the permanent magnet motor and the conductive short circuit ring according to the first, second, third and fourth embodiments.
In the figure, 1 denotes a motor rotor core, 2 denotes a permanent magnet, 3 denotes a rotor core, 4 denotes a stator core, 5 denotes an operating air gap between a stator and a rotor, 6 denotes a winding, 7 denotes a conductive short-circuiting ring of the present invention, 8 denotes a motor end cover, 9 denotes a motor bearing, 10 denotes a motor housing, 11 denotes a bolt for fixing the conductive short-circuiting ring, 12 denotes a slot for mounting the permanent magnet, 13 denotes a leakage flux line at an end of the permanent magnet motor, 14 denotes an annular flow hole on the conductive short-circuiting ring 7, 15 denotes a mounting hole on the conductive short-circuiting ring 7, and 16 denotes a fixing rod coupled to the motor housing.
Detailed Description
The invention is further illustrated below with reference to examples:
example one
Fig. 5a shows the leakage flux at the end of a permanent magnet machine. It can be seen that the leakage flux 13 is mainly concentrated at the end of the working air gap 5 between the stator core 4 and the rotor permanent magnet pole 2. As a first embodiment, the conductive short circuit ring 7 of the present invention made of pure copper is provided with a plurality of circular circulation holes 14, the conductive short circuit ring 7 is fixed at the end close to the rotor by a fixing rod 16 and a mounting bolt 11 connected with the motor housing, as shown in fig. 6, and the specific structure of the conductive short circuit ring 7 is shown in fig. 4 a. It can be clearly seen that the outer diameter of the conductive short circuit ring 7 is larger than the outer diameter of the motor working air gap 5 and smaller than the outer diameter of the stator core 4, and the inner diameter of the conductive short circuit ring 7 is larger than the outer diameter of the rotor spindle 1 and smaller than the inner diameter of the motor working air gap 5.
During operation of the electric machine, the leakage flux 13 is a dynamic magnetic field which moves in rotation relative to the stationary conductive short-circuit ring 7. The eddy currents induced in the conductive short-circuit ring 7 will generate a magnetic field in the opposite direction to said leakage magnetic field according to the law of electromagnetic induction and thereby create a tendency to suppress the outward expansion of the leakage flux 13, in other words, part of the leakage flux 13 is squeezed back into the working air gap, as shown in fig. 5 b. Therefore, on one hand, the air gap magnetic field at the end part of the motor is enhanced, and the electric efficiency of the motor is improved; on the other hand, the leakage magnetic flux 13 is confined in a small space between the conductive short ring 7 and the rotor end, and hence adverse effects such as the heating effect of the dynamic leakage magnetic flux on the end cover, the flange, and the like having magnetic permeability and external electromagnetic radiation are completely suppressed.
Example two
Similarly to the embodiment, the conductive short circuit ring 7 is also fixed at the end close to the rotor by a fixing rod 16 and a mounting bolt 11 which are connected with the motor shell, as shown in fig. 6; the specific structure of the conductive short circuit ring 7 is shown in fig. 4b, and is formed by stacking a plurality of pure aluminum foils. It will be appreciated that the conductive short-circuit ring 7, which is made by stacking a plurality of thin sheet-like conductive materials, has a higher inductance than a single conductive short-circuit ring of the same shape and size, and thus has a better effect of suppressing the leakage flux of the rotor.
It can be seen that, a plurality of circular circulation holes 14 are formed on the conductive short circuit ring 7 of the present embodiment; the outer diameter of the conductive short circuit ring 7 is larger than the outer diameter of the motor working air gap 5 and smaller than the outer diameter of the stator core 4, and the inner diameter of the conductive short circuit ring 7 is larger than the outer diameter of the rotor mandrel 1 and smaller than the inner diameter of the motor working air gap 5.
EXAMPLE III
Similarly to the third embodiment, the conductive short circuit ring 7 of the present invention made of pure copper is formed with a plurality of fan-shaped circulation holes 14, and the conductive short circuit ring 7 is fixed at the end near the rotor by the fixing rod 16 and the mounting bolt 11 connected with the motor housing, as shown in fig. 6, and the specific structure of the conductive short circuit ring 7 is shown in fig. 4 c.
It can be seen that, the conductive short-circuit ring 7 of the present embodiment is formed with a plurality of fan-shaped circulation holes 14; the outer diameter of the conductive short circuit ring 7 is larger than the outer diameter of the motor working air gap 5 and smaller than the outer diameter of the stator core 4, and the inner diameter of the conductive short circuit ring 7 is larger than the outer diameter of the rotor mandrel 1 and smaller than the inner diameter of the motor working air gap 5.
Example four
Similar to the first embodiment, as the fourth embodiment, a plurality of pure copper foils are used to make the stacked conductive short circuit ring 7 of the present invention, a plurality of rectangular circulation holes 14 are made, the conductive short circuit ring 7 is fixed at the end close to the rotor by a fixing rod 16 and a mounting bolt 11 connected with the motor housing, as shown in fig. 6, and the specific structure of the conductive short circuit ring 7 is shown in fig. 4 d.
It can be seen that, a plurality of rectangular circulation holes 14 are formed on the conductive short circuit ring 7 of the present embodiment; the outer diameter of the conductive short circuit ring 7 is larger than the outer diameter of the motor working air gap 5 and smaller than the outer diameter of the stator core 4, and the inner diameter of the conductive short circuit ring 7 is larger than the outer diameter of the rotor mandrel 1 and smaller than the inner diameter of the motor working air gap 5.
It will be understood by those skilled in the art that the present embodiments do not constitute any limitation on the principles of the invention. It is apparent that the electrically conductive shorting ring 7 of the present invention can be applied to any of the rotary permanent magnet motors of the prior art and thus is economically efficient.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the above embodiments are merely illustrative of the present invention and do not limit the present invention. In addition, although the embodiments are described above in a separate, separated form, it will be appreciated by those skilled in the art that a plurality of the embodiments described above may also be applied in combination. And that various modifications and changes may be made by those skilled in the art after reading the above description in conjunction with existing conventional techniques for manufacturing permanent magnet machines, and such modifications and changes are intended to be within the scope of the present invention.
Claims (6)
1. A permanent magnet electric machine comprising: working air gap (5), winding (6), motor end cover (8), motor bearing (9), motor housing (10) and setting that form between motor rotor dabber (1), permanent magnet (2), rotor core (3), stator core (4), rotor core and the stator core are in be used for the installation on rotor core (3) groove (12) of permanent magnet (2), its characterized in that permanent magnet motor is being close to rotor core's (3) tip department installs a pair of static electric conductivity short circuit ring (7), dead lever (16) that the inner wall of motor housing (10) was provided with, electric conductivity short circuit ring (7) utilize bolt (11) to install through mounting hole (15) on dead lever (16).
2. The permanent magnet electric machine of claim 1, wherein: the outer diameter of the conductive short circuit ring (7) is larger than that of the motor and is smaller than that of the working air gap (5) and that of the stator core (4), and the inner diameter of the conductive short circuit ring (7) is larger than that of the rotor mandrel (1) and is smaller than that of the motor and that of the working air gap (5).
3. The permanent magnet electric machine of claim 1, wherein: a plurality of circulation holes (14) are arranged on the annular wall of the conductive short circuit ring (7) along the axial direction.
4. The permanent magnet electric machine of claim 3, wherein: the shape of the annular flow holes (14) is circular, fan-shaped, rectangular or other easily machined shape.
5. The permanent magnet electric machine of claim 1, wherein: the conductive short circuit ring (7) is made of a highly conductive material such as copper, aluminum, silver, graphite, or a composite of these materials.
6. The permanent magnet electric machine of claim 5, wherein: the conductive short circuit ring (7) is formed by stacking a plurality of layers of flaky conductive materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910519338.0A CN112104179A (en) | 2019-06-17 | 2019-06-17 | Permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910519338.0A CN112104179A (en) | 2019-06-17 | 2019-06-17 | Permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112104179A true CN112104179A (en) | 2020-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910519338.0A Pending CN112104179A (en) | 2019-06-17 | 2019-06-17 | Permanent magnet motor |
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| Country | Link |
|---|---|
| CN (1) | CN112104179A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06189516A (en) * | 1992-12-11 | 1994-07-08 | Chiba Seimitsu:Kk | Brushless dc motor |
| JPH08251895A (en) * | 1995-03-03 | 1996-09-27 | Sayama Precision Ind Co | Brushless motor |
| JP2004254356A (en) * | 2003-02-18 | 2004-09-09 | Toyota Motor Corp | Electric motor and electric motor system |
| CN102761220A (en) * | 2011-04-25 | 2012-10-31 | 株式会社安川电机 | Magnet-embedded rotary motor |
-
2019
- 2019-06-17 CN CN201910519338.0A patent/CN112104179A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06189516A (en) * | 1992-12-11 | 1994-07-08 | Chiba Seimitsu:Kk | Brushless dc motor |
| JPH08251895A (en) * | 1995-03-03 | 1996-09-27 | Sayama Precision Ind Co | Brushless motor |
| JP2004254356A (en) * | 2003-02-18 | 2004-09-09 | Toyota Motor Corp | Electric motor and electric motor system |
| CN102761220A (en) * | 2011-04-25 | 2012-10-31 | 株式会社安川电机 | Magnet-embedded rotary motor |
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Application publication date: 20201218 |