CN110601474A - Radial magnetic field composite flux switching motor - Google Patents
Radial magnetic field composite flux switching motor Download PDFInfo
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- CN110601474A CN110601474A CN201910873644.4A CN201910873644A CN110601474A CN 110601474 A CN110601474 A CN 110601474A CN 201910873644 A CN201910873644 A CN 201910873644A CN 110601474 A CN110601474 A CN 110601474A
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- 230000004907 flux Effects 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000004804 winding Methods 0.000 claims description 48
- 101100522751 Xenorhabdus nematophila (strain ATCC 19061 / DSM 3370 / CCUG 14189 / LMG 1036 / NCIMB 9965 / AN6) pvcA gene Proteins 0.000 claims description 2
- 241001611138 Isma Species 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000033228 biological regulation Effects 0.000 abstract description 15
- 230000005347 demagnetization Effects 0.000 abstract description 5
- 230000002427 irreversible effect Effects 0.000 abstract description 5
- 230000005284 excitation Effects 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/02—Synchronous motors
- H02K19/10—Synchronous motors for multi-phase current
-
- 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
- H02K21/38—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary
- H02K21/44—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary with armature windings wound upon the magnets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention relates to the field of motor design, and discloses a radial magnetic field composite type flux switching motor which comprises a fixed shaft (6), a rotating shaft (5) coaxially and rotatably connected with the fixed shaft, an inner rotor (4) surrounding the rotating shaft, an inner stator (3) surrounding the inner rotor, a bearing (23) surrounding the inner stator, an outer stator (2) surrounding the bearing, and an outer rotor (1) surrounding the outer stator; air gaps are arranged between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner rotor and the outer rotor are fixedly connected with the rotating shaft, the inner stator is fixedly connected with the fixed shaft, and the radial inner side and the radial outer side of the bearing (23) are respectively connected with the outer diameter of the inner stator and the inner diameter of the outer stator. The invention meets the requirements of low-speed large-torque and wide speed regulation range operation of the driving motor on the premise of improving the operation reliability of the permanent magnet and avoiding irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation and high temperature.
Description
Technical Field
The invention relates to the field of motor design, in particular to a radial magnetic field composite type flux switching motor.
Background
In recent years, a flux switching permanent magnet motor (FSPM for short) is widely researched due to high torque density and high efficiency, in the motor structure, a permanent magnet and a winding are both arranged on a stator, the rotor structure is simple, and the reliability and the dynamic running performance of the motor are improved. However, due to the inherent characteristics of the permanent magnet, the air gap field of the FSPM motor is kept constant basically during the operation, and the FSPM motor is difficult to control the excitation and limited in speed regulation range during the electric operation. Therefore, how to realize the limited adjustment and control of the magnetic field and widen the speed regulation range is one of the problems to be solved by the FSPM motor. The study of the hybrid excitation FSPM motor is carried out by the students, the stator is provided with an excitation winding besides the permanent magnet, the dual excitation source hybrid excitation mode is realized, the magnetic field regulation capacity can be improved, and the rotating speed operation range is widened. However, the stator in the motor structure has the permanent magnet and two sets of windings (the excitation winding and the armature winding) at the same time, so that on one hand, the saturation degree of a magnetic circuit is high, on the other hand, the placing space of the armature winding is restricted, and the torque output capacity is limited to a certain degree; and because the heat source is all located the stator, easily lead to stator winding and permanent magnet temperature rise too high, bring winding insulation damage and permanent magnet irreversible demagnetization.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a radial magnetic field composite type magnetic flux switching motor which meets the requirements of low-speed large-torque and wide speed regulation range operation of a driving motor on the premise of improving the operation reliability of a permanent magnet and avoiding irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation and high temperature.
The technical scheme is as follows: the invention provides a radial magnetic field composite type flux switching motor which comprises a fixed shaft, a rotating shaft, an inner rotor, an inner stator, a bearing, an outer stator and an outer rotor, wherein the rotating shaft is coaxially and rotatably connected with the fixed shaft; air gaps are arranged between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner rotor and the outer rotor are fixedly connected with the rotating shaft, the inner stator is fixedly connected with the fixed shaft, and the radial inner side and the radial outer side of the bearing are respectively connected with the outer diameter of the inner stator and the inner diameter of the outer stator.
Furthermore, salient pole teeth are arranged on the opposite sides of the outer rotor and the outer stator and the opposite sides of the inner rotor and the inner stator, no winding is arranged on the salient pole teeth of the outer rotor and the inner rotor, an outer armature winding and a permanent magnet are arranged on the salient pole teeth of the outer stator, and an inner armature winding is arranged on the salient pole teeth of the inner stator.
Preferably, the number of salient pole teeth of the outer stator isP soThe outer armature winding is formed by symmetrically distributedP soA coil sleeved on the salient pole teeth of the outer stator, and an outer armature windingmA phase concentrated winding, satisfyP so=2k 1 mWherein isk 1A positive integer; the number of the salient pole teeth of the outer rotor isP roSatisfy the following requirementsP ro=P so±2N1In which N is1Is a positive integer.
Preferably, the number of the salient pole teeth of the inner stator isP siThe inner armature winding is formed by symmetrically distributedP siA coil sleeved on the salient pole teeth of the inner stator, and the inner armature winding isnA phase concentrated winding, satisfyP si=2k 2 nWherein isk 2A positive integer; the number of the salient pole teeth of the inner rotor isP riSatisfy the following requirementsP ri=P si±2N2In which N is2Is a positive integer.
Preferably, the permanent magnets are tangentially alternately magnetized permanent magnets.
Preferably, the inner rotor yoke portion is fixed to the rotating shaft at a radially inner edge thereof.
Preferably, the outer radial edge of the outer rotor yoke core is fixedly connected to the rotating shaft through a connecting housing.
Preferably, the inner stator yoke core is fixedly coupled to the fixed shaft through an end housing.
Preferably, the outer rotor, the outer stator, the inner rotor and the inner stator have salient pole teeth oriented in a radial direction.
Preferably, the inner armature winding and the outer armature winding are both multiphase concentrated armature windings.
Has the advantages that: the invention relates to a radial magnetic field composite motor, wherein an outer stator and an outer rotor form an outer motor, and an inner stator and an inner rotor form an inner motor; the inner and outer motors are completely independent and have no electromagnetic coupling, so that the inner and outer motors can be independently controlled. The inner motor and the outer motor have various motor structure options, and if the outer motor can adopt a double salient pole permanent magnet motor and a magnetic flux reversal motor. The tooth grooves of the salient pole teeth of the stators and the rotors of the inner motor and the outer motor of the radial magnetic field composite type magnetic flux switching motor are matched, and the number of phases, the excitation mode and the like can be flexibly adjusted according to the performance requirements of the system.
Compared with the prior art, the invention has the following advantages:
1. the inner stator and the inner rotor are both provided with no permanent magnet, so that the high-temperature irreversible demagnetization of the permanent magnet caused by the difficult heat dissipation of the inner motor can be avoided; although the outer motor has permanent magnets, under the action of a bearing on the stator, the speed regulation is completed by the inner motor under a high-speed working condition, and the outer stator of the outer motor can always work near a rated point through the equidirectional rotation when the rotor rotates at a high speed, so that the irreversible demagnetization risk of the permanent magnets caused by the weak magnetic speed regulation of the outer motor is avoided while the torque output is increased; from the two points, the invention improves the working stability of the permanent magnet and the working reliability of the motor.
2. The inner stator and the inner rotor form a speed regulating motor with a wider speed regulating range, the outer stator and the outer rotor form a permanent magnet torque regulating motor with larger torque output capacity, and the two motors are respectively used for regulating the rotating speed and the torque during operation so as to realize the power requirements of loads under different working conditions and meet the requirements of a driving system on low speed, large torque and wide speed regulating range.
3. The inner motor and the outer motor can operate in different working modes such as independent driving or common driving, and the speed-regulating inner motor can operate independently when the permanent magnet of the torque-regulating outer motor fails to work, so that the motor has certain fault tolerance.
Drawings
Fig. 1 is a cross-sectional view of a radial magnetic field composite flux switching motor in which an inner motor is a 3-phase stator 12 slot/rotor 8 pole and an outer motor is a 3-phase stator 12 slot/rotor 22 pole.
Fig. 2 is a cross-sectional view of a radial magnetic field composite flux switching motor of the present invention.
In the figure: the rotor comprises an outer rotor 1, an outer stator 2, an inner stator 3, an inner rotor 4, an outer armature winding 21, a permanent magnet 22, a bearing 23, an inner armature winding 31, a rotating shaft 5, a fixed shaft 6, a connecting shell 7 and an end shell 8.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The embodiment provides a radial magnetic field composite flux switching motor which mainly comprises a fixed shaft 6, a rotating shaft 5 coaxially and rotatably connected with the fixed shaft 6, an inner rotor 4 surrounding the rotating shaft 5, an inner stator 3 surrounding the inner rotor 4, a bearing 23 surrounding the inner stator 3, an outer stator 2 surrounding the bearing 23 and an outer rotor 1 surrounding the outer stator 2. An air gap is arranged between the outer stator 2 and the outer rotor 1, an air gap is arranged between the inner stator 3 and the inner rotor 4, salient pole teeth without windings are arranged on one side of the outer rotor 1 facing the outer stator 2 and one side of the inner rotor 4 facing the inner stator 3, salient pole teeth and outer armature windings 21 wound on the salient pole teeth are arranged on the outer side of the outer stator 2, and salient pole teeth and inner armature windings 31 wound on the salient pole teeth are arranged on the inner side of the inner stator 3. The inner rotor 4 is fixed on the rotating shaft 5 at the radial inner edge of the yoke part, the outer rotor 1 is fixed with the rotating shaft 5 at the radial outer edge of the yoke part iron core through the connecting shell 7, the inner stator 3 is fixed with the other side fixed shaft 6 through the end shell 8, a bearing 23 is arranged between the inner diameter of the outer stator 2 and the outer diameter of the inner stator 3, the radial inner side and the radial outer side of the bearing 23 are respectively connected with the outer diameter of the inner stator 3 and the inner diameter of the outer stator 2, and the salient pole teeth of the outer stator 2 are internally provided with permanent. It should be noted that the salient pole orientations of the stator and the rotor in the present invention are both directed in the radial direction.
Fig. 1 shows a radial magnetic field composite flux switching motor in which an inner motor is a 3-phase stator 12 slot/rotor 8 pole and an outer motor is a 3-phase stator 12 slot/rotor 22 pole, and the technical solution of the present embodiment will be specifically described below by taking this motor as an example.
12 permanent magnets 22 are distributed on the outer stator 2 along the circumference, an iron core groove unit is arranged between every two adjacent permanent magnets 22, the notch of the iron core groove unit faces the outer rotor 1, the 12 iron core groove units and the 12 permanent magnets are alternately arranged along the circumference, each permanent magnet 22 and two adjacent stator teeth on two tangential sides of the permanent magnet form a salient pole tooth of the outer stator 2, 12 winding coils are wound on the 12 salient pole teeth of the outer stator 2, and 4 winding coils at intervals of 90 degrees are connected in series in the same direction to form a phase concentrated winding, so that a three-phase concentrated armature winding, namely an outer armature winding 21, is formed. The number of salient pole teeth of the outer rotor 1 is 22, and the salient pole teeth thereof face the outer stator 2. The outer rotor 1, the outer stator 2, the permanent magnets 22 on the outer stator and the outer armature winding 21 form a three-phase 12/22-pole permanent magnet flux switching outer motor. The inner stator 3 is an inner salient pole tooth structure, no permanent magnet is arranged on the inner stator, 12 armature winding coils are sleeved on 12 salient pole teeth, and every 4 salient pole teeth are connected in series to form a phase concentrated winding, so that a three-phase inner armature winding, namely an inner armature winding 31 is formed, the number of the salient pole teeth of the inner rotor 4 is 8, and the inner rotor 4, the inner stator 3 and the inner armature winding 31 thereon form a three-phase 12/8-pole switched reluctance inner motor.
The inner motor adopts a switched reluctance motor, has a simple structure, is suitable for high-speed operation, is easy to cool, and can allow higher temperature rise because the inner stator 3 and the inner rotor 4 are both provided with no permanent magnet. The outer motor adopts a permanent magnet flux switching motor structure, and the outer rotor is simple in structure, high in torque density and high in efficiency. Because the outer rotor 1 and the inner rotor 4 are fixedly connected with the rotating shaft 5, the inner motor and the outer motor have the same rotor rotating speed, the inner stator 3 is fixed on the fixed shaft 6 and has no rotating speed, and the outer stator 2 can rotate at a certain rotating speed according to the working condition due to the existence of the bearing 23.
In the embodiment, the internal motor mainly completes the speed regulation of the motor according to the operation requirement, so that the rotating shaft 5 rotates at a target rotating speed and simultaneously outputs a certain torque; the outer motor can enable the outer stator 2 and the outer rotor 1 to rotate in the same direction at a different speed, so that the outer motor works near a rated point with higher efficiency, and the deficiency of the output torque of the inner motor is made up. Therefore, the inner motor and the outer motor are respectively responsible for speed regulation and torque regulation, the inner motor has small volume and is suitable for high-speed operation, and a permanent magnet is not needed, so that the permanent magnet is not needed to participate in weak magnetic speed regulation in the speed regulation process; meanwhile, the outer motor has high torque density and high torque output capacity, and due to the action of the bearing 23, the outer motor can always work near a rated point under different working conditions, so that the shortage of the output torque of the inner motor can be provided by the outer motor no matter the motor operates at low speed or high speed, and the requirements of the motor on low-speed large torque and wide speed regulation range operation are met.
The inner motor system and the outer motor system of the composite motor are not electromagnetically coupled, independent control can be performed according to two common motors, controllable parameters are greatly more than those of a common magnetic flux switching motor, and the composite motor is very flexible. The inner motor and the outer motor can run in different working modes such as single-machine driving, double-machine common driving, double-machine power generation and the like according to different working condition requirements, and when the inner motor and the outer motor both do power generation, two groups of electric energy with different power, frequency, amplitude and voltage grade can be output; the internal and external motor systems can also be operated by one for power generation and the other for electric operation, so as to meet different application occasions and performance requirements.
The motor provided by the invention integrates the permanent magnetic flux switching outer motor and the switched reluctance inner motor in a radial magnetic field motor space, and two power flow paths are provided. The inner motor and the outer motor can adopt other motor structures, so that the flexibility of the system is greatly improved, and the application range is expanded.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A radial magnetic field composite type flux switching motor is characterized by comprising a fixed shaft (6), a rotating shaft (5) coaxially and rotatably connected with the fixed shaft (6), an inner rotor (4) surrounding the rotating shaft (5), an inner stator (3) surrounding the inner rotor (4), a bearing (23) surrounding the inner stator (3), an outer stator (2) surrounding the bearing (23), and an outer rotor (1) surrounding the outer stator (2); air gaps are arranged between the outer stator (2) and the outer rotor (1) and between the inner stator (3) and the inner rotor (4); the inner rotor (4) and the outer rotor (1) are fixedly connected with the rotating shaft (5), the inner stator (3) is fixedly connected with the fixed shaft (6), and the radial inner side and the radial outer side of the bearing (23) are respectively connected with the outer diameter of the inner stator (3) and the inner diameter of the outer stator (2).
2. The radial magnetic field composite flux switching motor according to claim 1, wherein salient pole teeth are provided on the opposite sides of the outer rotor (1) and the outer stator (2) and the opposite sides of the inner rotor (4) and the inner stator (3), and no winding is provided on the salient pole teeth of the outer rotor (1) and the inner rotor (4), an outer armature winding (21) and a permanent magnet (22) are provided on the salient pole teeth of the outer stator (2), and an inner armature winding (31) is provided on the salient pole teeth of the inner stator (3).
3. A radial-field hybrid flux-switching electric machine according to claim 1, characterized in that the number of salient pole teeth of the outer stator (2) isP soThe outer armature winding (21) is formed by symmetrically distributedP soOne cover is arranged outsideThe coil on the salient pole teeth of the stator (2) is formed, and the outer armature winding (21) ismA phase concentrated winding, satisfyP so=2k 1 mWherein isk 1A positive integer;
the number of salient pole teeth of the outer rotor (1) isP roSatisfy the following requirementsP ro=P so±2N1In which N is1Is a positive integer.
4. A radial magnetic field composite flux switching electric machine according to claim 3, characterized in that the number of salient pole teeth of the inner stator (3) isP siThe inner armature winding (31) is formed by symmetrically distributedP siA coil sleeved on the salient pole teeth of the inner stator (3), and the inner armature winding (31) isnA phase concentrated winding, satisfyP si=2k 2 nWherein isk 2A positive integer;
the number of the salient pole teeth of the inner rotor (4) isP riSatisfy the following requirementsP ri=P si±2N2In which N is2Is a positive integer.
5. Radial field compound flux switching electrical machine according to any of claims 1 to 4, characterized in that the permanent magnets (22) are tangentially alternately magnetized permanent magnets.
6. A radial magnetic field composite flux switching electric machine according to any of claims 1 to 4, characterized in that the radially inner edge of the yoke part of the inner rotor (4) is fixed to the rotating shaft (5).
7. The radial magnetic field composite flux switching motor according to any one of claims 1 to 4, wherein a radially outer edge of a yoke core of the outer rotor (1) is fixedly connected to the rotating shaft (5) through a connection housing (7).
8. A radial magnetic field composite flux switching electric machine according to any of claims 1 to 4, characterized in that the inner stator (3) yoke core is fixedly connected with the fixed shaft (6) by means of an end housing (8).
9. A radial-magnetic-field-combined-type flux-switching electric machine according to any of claims 1 to 4, characterized in that the salient-pole teeth on the outer rotor (1), the outer stator (2), the inner rotor (4) and the inner stator (3) are oriented in the radial direction.
10. A radial-field composite flux-switching electric machine according to any of claims 1 to 4, characterized in that the inner armature winding (31) and the outer armature winding (21) are both multiphase concentrated armature windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873644.4A CN110601474A (en) | 2019-09-17 | 2019-09-17 | Radial magnetic field composite flux switching motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873644.4A CN110601474A (en) | 2019-09-17 | 2019-09-17 | Radial magnetic field composite flux switching motor |
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| Publication Number | Publication Date |
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| CN110601474A true CN110601474A (en) | 2019-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910873644.4A Pending CN110601474A (en) | 2019-09-17 | 2019-09-17 | Radial magnetic field composite flux switching motor |
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| Country | Link |
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| CN (1) | CN110601474A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082622A (en) * | 2020-01-10 | 2020-04-28 | 南京航空航天大学 | Decoupling type birotor alternating pole permanent magnet motor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2066636U (en) * | 1990-05-16 | 1990-11-28 | 张恩侗 | Magnetogenerator |
| CN1645719A (en) * | 2004-12-30 | 2005-07-27 | 山东大学 | Permanent magnet electric motor with double rotor |
| CN101951091A (en) * | 2010-09-09 | 2011-01-19 | 中国科学院长春光学精密机械与物理研究所 | Double-rotor multi-pole motor of micro unmanned aerial vehicle |
| CN102832771A (en) * | 2012-08-03 | 2012-12-19 | 东南大学 | Combined-type flux switching permanent magnet motor |
| CN104362822A (en) * | 2014-10-24 | 2015-02-18 | 东南大学 | Self-flux-weakening composite flux-switching permanent-magnet motor |
| CN108512380A (en) * | 2018-05-10 | 2018-09-07 | 哈尔滨理工大学 | A kind of Circular Winding birotor permanent magnetic synchronous motor with electromagnetism linkage |
| CN210608875U (en) * | 2019-09-17 | 2020-05-22 | 淮阴工学院 | Radial magnetic field composite magnetic flux switching motor |
-
2019
- 2019-09-17 CN CN201910873644.4A patent/CN110601474A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2066636U (en) * | 1990-05-16 | 1990-11-28 | 张恩侗 | Magnetogenerator |
| CN1645719A (en) * | 2004-12-30 | 2005-07-27 | 山东大学 | Permanent magnet electric motor with double rotor |
| CN101951091A (en) * | 2010-09-09 | 2011-01-19 | 中国科学院长春光学精密机械与物理研究所 | Double-rotor multi-pole motor of micro unmanned aerial vehicle |
| CN102832771A (en) * | 2012-08-03 | 2012-12-19 | 东南大学 | Combined-type flux switching permanent magnet motor |
| CN104362822A (en) * | 2014-10-24 | 2015-02-18 | 东南大学 | Self-flux-weakening composite flux-switching permanent-magnet motor |
| CN108512380A (en) * | 2018-05-10 | 2018-09-07 | 哈尔滨理工大学 | A kind of Circular Winding birotor permanent magnetic synchronous motor with electromagnetism linkage |
| CN210608875U (en) * | 2019-09-17 | 2020-05-22 | 淮阴工学院 | Radial magnetic field composite magnetic flux switching motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082622A (en) * | 2020-01-10 | 2020-04-28 | 南京航空航天大学 | Decoupling type birotor alternating pole permanent magnet motor |
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