CN111509937A - Coaxial line opposed rotor differential motor and new energy automobile - Google Patents
Coaxial line opposed rotor differential motor and new energy automobile Download PDFInfo
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- CN111509937A CN111509937A CN202010435226.XA CN202010435226A CN111509937A CN 111509937 A CN111509937 A CN 111509937A CN 202010435226 A CN202010435226 A CN 202010435226A CN 111509937 A CN111509937 A CN 111509937A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2036—Electric differentials, e.g. for supporting steering vehicles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
- H02P25/184—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
- H02P25/188—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays wherein the motor windings are switched from series to parallel or vice versa to control speed or torque
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Windings For Motors And Generators (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
A coaxial opposed rotor differential motor belongs to the technical field of electromechanics and automobiles and comprises a motor shell, a stator, a first rotor and a second rotor which are coaxially assembled and are in an opposed form; the stator, the first rotor and the second rotor are all stator and rotor structures of an asynchronous motor, the electrical parameters of the first rotor and the second rotor are the same, the stator comprises a stator magnetic core and a stator winding, the sum of the lengths of the effective magnetic cores of the first rotor and the second stator is equal to the length of the stator magnetic core, and a magnetic field generated by the stator winding is shared by the first rotor and the second rotor; the first rotor is provided with a first output shaft, the second rotor is provided with a second output shaft, flexible free running is allowed between the first rotor and the second rotor, and the two rotors are axially clamped by two end covers; when the stator winding is connected with an alternating current power supply, the three-phase rotating magnetic field vertical to the coil is axially divided according to the electromagnetic principle, so that the first output shaft and the second output shaft face different resistance moments to realize a differential effect.
Description
Technical Field
The invention belongs to the technical field of electromechanical technology and automobile control, and particularly relates to a coaxial opposed rotor differential motor and a new energy automobile.
Background
The existing automobiles adopt the differential mechanism to realize speed difference driving between wheels, the same mechanical differential mechanism is also configured on the new energy electric automobile, and the structure causes the problems of insertion loss of the differential mechanism, reduction of mechanical transmission efficiency, transmission noise, difficulty in light weight of the differential mechanism, increase of the structural cost and the operating cost of the automobile, maintenance time limit and the like. For an automobile adopting the hub motor, the differential-free driving can be realized, but the hub motor and a control system thereof have the problems of complicated structure, high cost, changed weight ratio of an automobile body and a gear train, complicated software of an inter-wheel control system, immature technology, running risk and the like, so that the driving mode of the hub motor and even a wheel-side motor is greatly limited. In addition, for a vehicle adopting the permanent magnet motor, the problems of high cost, thermal demagnetization and secondary battery loss exist, and the industrial chain of the permanent magnet motor also has the problems of rare earth resource shortage consumption and environmental protection in the process of exploitation and processing.
Disclosure of Invention
The present invention is directed to an electric drive system that eliminates the conventional mechanical differential, and at the core thereof, is a differential motor with coaxially opposed rotors to overcome some of the technical problems involved in the background art.
The technical scheme of the invention is as follows:
according to a first aspect of the present invention, there is provided a differential electric machine with coaxially opposed rotors, characterized by comprising:
a motor housing, a stator, a first rotor and a second rotor in a coaxial line assembly in an opposed form, wherein,
the stator is a stator of an asynchronous motor and comprises a stator magnetic core and a stator winding, the stator is assembled in a motor shell, the stator winding is assembled in a slot circuit of the stator magnetic core, the length of a straight conductor part of the stator winding is equal to the sum of the axial length of the effective magnetic core of the first rotor and the axial length of the effective magnetic core of the second rotor, and a magnetic field generated by the stator winding is shared by the first winding and the second winding,
the first rotor and the second rotor are both rotor structures of an asynchronous motor, the electrical parameters of the first rotor and the second rotor are the same, the sum of the axial length of the effective magnetic core of the first rotor and the axial length of the effective magnetic core of the second rotor is equal to the axial length of the effective magnetic core of the stator, a first output shaft is arranged at the left end of the first rotor shaft, a second output shaft is arranged at the right end of the second rotor shaft,
the configuration form of the axial right end of the first rotor and the axial left end of the second rotor is as follows:
① the first rotor axial stop is designed to clamp the first output shaft axially only by the motor casing axial left end housing, the second rotor axial stop is designed to clamp the second output shaft axially only by the motor casing axial right end housing, the first rotor axial right end is aligned with the second rotor axial left end axis leaving an air gap, the air gap width is no greater than 1 mm, flexible free running is allowed between the first rotor and the second rotor,
② wherein the first rotor axial stop is designed to axially clamp the first output shaft by the motor housing axial left end housing, the second rotor axial stop is designed to axially clamp the second output shaft by the motor housing axial right end housing, the first rotor axial right end and the second rotor axial left end are axially aligned and a thrust bearing mutual support is provided therebetween, or a roller bearing mutual support is provided therebetween, the thrust bearing or the roller bearing is invisibly installed, that is, a central portion of the first rotor axial right end and/or the second rotor axial left end is left with a recess for receiving the thrust bearing or the roller bearing, the periphery of the recess is the right end portion of the first rotor effective magnetic core or the left end portion of the second rotor effective magnetic core, when the first rotor and the second rotor are assembled into the motor housing, the distance between the first rotor axial right end and the second rotor axial left end is not more than 1 mm, and the first rotor and the second rotor are allowed to freely run,
when the stator winding is connected with an alternating current power supply, a rotating magnetic field generated by the stator drives the first rotor and the second rotor to rotate, when the resisting moments of the first output shaft and the second output shaft are balanced, the rotating magnetic field drives the first rotor and the second rotor to run at a constant speed, when the resisting moments of the first output shaft and the second output shaft are unbalanced, the rotating speed of the rotor with large resisting moment is reduced to reduce the inductance of the corresponding stator part, the equivalent voltage of the stator winding conductor corresponding to the stator part is reduced, the rotating speed of the rotor with small resisting moment is increased to increase the inductance of the corresponding stator part, the equivalent voltage of the stator winding conductor corresponding to the stator part is increased, and the first output shaft and the second output shaft face the resisting moment to realize a differential effect.
Further, a coaxial line contraposition rotor differential motor is provided, which is characterized in that,
the first output shaft outputs power outwards through one speed reducer, and the second output shaft outputs power outwards through the other speed reducer.
Further, the coaxial line contraposition rotor differential motor is characterized in that an electronic control module is further assembled in a motor shell and used for controlling the current of the stator winding, achieving compact integrated design and reducing electromagnetic pollution and signal and energy transmission loss.
According to a second aspect of the present invention, there is provided a voltage control method of a coaxial opposed-rotor differential motor, characterized by comprising the steps of,
① obtains a first output shaft rotating speed signal SP1 and a second output shaft rotating speed signal SP2 by detecting the rotating speeds of a first output shaft and a second output shaft of the coaxial line opposite rotor differential motor, transmits the signals SP1 and SP2 to an electronic control unit ECU,
②, the ECU compares the signals SP1 and SP2, judges whether the difference between the rotational speeds reflected by the two signals exceeds a preset set value,
③ when the difference between the two signals does not exceed the preset value, the ECU defaults the difference and does not regulate the power supply voltage, when the difference between the two signals exceeds the preset value, the ECU regulates the power supply voltage through the power converter, so that the power supply of the coaxial line opposed rotor differential motor is optimized.
According to a third aspect of the invention, a new energy automobile is provided, which is characterized by comprising the coaxial line contraposition rotor differential motor of the first aspect of the invention.
The invention has the beneficial effects that:
1. the differential control motor provided by the invention adopts an alternating current motor structure, is firm and reliable, strong in durability, strong in technical universality, simplified in structure, improved in operation reliability, beneficial to large-scale industrialization and reduced in cost.
2. The alternating current motor has high technical maturity, is easy to popularize, reduces the industrial input cost and shortens the construction period.
3. The permanent magnet is saved, the cost and the process difficulty are saved, the mining resources are saved, and the environmental protection problem caused by rare earth mining is reduced.
4. And a mechanical differential is omitted, so that the structural cost is reduced, the weight is reduced, and the light weight is facilitated.
5. The circuit structure is simpler, and the number of peripheral driving elements is less.
6. The method provides a new technical view and development space for the technical field of vehicle and related motor control, and also opens up a new technical development space for hybrid power systems and the like.
Drawings
FIG. 1 is a schematic structural view of a coaxial opposed-rotor differential motor with vacant rotors provided by the invention,
FIG. 2 is a schematic structural view of a coaxial opposed rotor differential motor with roller bearings between rotors according to the present invention,
FIG. 3 is a schematic structural view of a coaxial opposed rotor differential motor with thrust bearings between rotors according to the present invention,
figure 4 is a schematic view of the embodiment of figure 3 showing a circular thrust bearing,
figure 5 is a schematic view of a coaxial opposed rotor differential motor structure with roller bearings between rotors according to another embodiment of the present invention,
figure 6 is a schematic view of the bearing structure between rotors in the embodiment shown in figure 4,
figure 7 is a schematic view of a one turn stator winding with partial sections of coil straight conductors corresponding to first and second rotor regions,
figure 8 is a structural schematic view of a coaxial opposed rotor differential motor with a speed reducing mechanism provided by the invention,
fig. 9 is a step diagram of a voltage control method of a coaxial opposed-rotor differential motor provided by the invention.
Detailed Description
The invention provides a coaxial line contraposition rotor differential speed motor based on the relation between the inductance of a magnetic core corresponding to a straight conductor part of a motor stator and the rotating speed and the inductance of a rotor, firstly proposes and utilizes the relation between the axial corresponding relation of the inductance of a stator magnetic core turn and the voltage caused by the rotating speed of a first rotor and the differential speed of a second rotor, and is explained by combining a specific embodiment.
In a first aspect, a coaxial opposed-rotor differential electric machine is provided.
Example 1
As shown in fig. 1, a coaxial opposed rotor differential motor includes a motor housing 100 including a left end cover 101 and a right end cover 102, a stator 201, and a first rotor 301 and a second rotor 302 in a coaxial assembled opposed form.
The stator 201 is a stator of an asynchronous motor, and includes a stator magnetic core and a stator winding 202 (a part of a winding end is also shown in the figure, such as 251 and 252), the stator is assembled in a motor housing, the stator winding is assembled in a slot of the stator magnetic core, a length of a straight conductor part of the stator winding is equal to a sum of an axial length of an effective magnetic core of a first rotor and an axial length of an effective magnetic core of a second rotor, a magnetic field generated by the stator winding is shared by the first winding and the second winding, the first rotor and the second rotor are both rotor structures of the asynchronous motor, electrical parameters of the first rotor and the second rotor are the same, the sum of the axial length of the effective magnetic core of the first rotor and the axial length of the effective magnetic core of the second rotor is equal to the axial length of the effective magnetic core of the stator, a first output shaft is arranged at a left end of the first rotor shaft, and a second.
The arrangement of the right end of the first rotor in the axial direction and the left end of the second rotor in the axial direction is ① and ② described below.
① As shown in FIG. 1, the axial limit of the first rotor is designed to be clamped only by the left end housing of the motor housing axial direction to the first output shaft, the bearing 103 is assembled between the rotor shaft 303 of the first rotor and the left end cover 101, the rotor shaft is also assembled with the axial thrust plates 103 and 105. the axial limit of the second rotor is designed to be clamped only by the right end housing of the motor housing axial direction to the second output shaft, the bearing 104 is assembled between the rotor shaft 304 of the second rotor and the right end cover 102, the rotor shaft is also assembled with the axial thrust plates 108 and 106. the right end of the first rotor is aligned with the left end axis of the second rotor axial direction with an air gap left, the air gap width is not more than 1 mm, and flexible free running is allowed between the first rotor and the second rotor.
② As shown in FIG. 2, the axial limit of the first rotor is designed to clamp the first output shaft axially by the left end housing of the motor housing, the bearing 103 is assembled between the rotor shaft 303 and the left end cap 101 of the first rotor, which is also assembled with axial thrust plates 103 and 105. the axial limit of the second rotor shaft is designed to clamp the second output shaft axially by the right end housing 201 of the motor housing, the bearing 104 is assembled between the rotor shaft 304 and the right end cap 102 of the second rotor, which is also assembled with axial thrust plates 108 and 106. the axial right and left ends of the first rotor are aligned with the axial left end axis of the second rotor and are supported by the thrust bearing therebetween, as shown in FIG. 3 and FIG. 4, or by the ball bearing therebetween, as shown in FIG. 2 400. the thrust bearing or roller bearing is mounted invisibly with respect to the outer circumference of the rotor core, i.e. the central portion of the axial right end of the first rotor and/or left end of the second rotor shaft is left end recess (as shown in FIG. 2. the central portion of the left rotor core and right end recess of the first rotor shaft), and the axial right end of the first rotor is not more than 1 mm in the effective gap between the first rotor housing, and the outer circumference of the first rotor housing, as shown in FIG. 1 mm, the effective gap between the first rotor core 311 and the second rotor is not more effective gap between the second rotor core when the second rotor is not more than the right end of the first rotor housing, and the second rotor housing.
When the stator winding is connected with an alternating current power supply, a rotating magnetic field generated by the stator drives the first rotor and the second rotor to rotate, when the resisting moments of the first output shaft and the second output shaft are balanced, the rotating magnetic field drives the first rotor and the second rotor to run at a constant speed, when the resisting moments of the first output shaft and the second output shaft are unbalanced, the rotating speed of the rotor with large resisting moment is reduced to reduce the inductance of the corresponding stator part, the equivalent voltage of the stator winding conductor corresponding to the stator part is reduced, the rotating speed of the rotor with small resisting moment is increased to increase the inductance of the corresponding stator part, the equivalent voltage of the stator winding conductor corresponding to the stator part is increased, and the first output shaft and the second output shaft face the resisting moment to realize a differential effect.
As shown in fig. 7, taking a turn of a winding of a stator winding of a certain phase as an example, two straight conductor portions are embedded in the stator core slot, bounded by a middle dividing line 220 radially aligned with a midpoint position between the two rotors, a magnetic field generated by the left straight conductor portions 301 and 303 of the boundary 220 and an area of a city surrounding a left end of the turn of the winding drives the first rotor, and a magnetic field generated by the right straight conductor portions 302 and 304 of the boundary 220 and an area of a city surrounding a right end of the turn of the winding drives the second rotor. According to the ampere rule and the biot savart law, the direction of the magnetic field generated by each coil is determined to be generally vertical to the coil plane or the coil curved surface, and the current in the conductor penetrates through the stator magnetic core along with the straight conductor in the slot circuit, so that the conductor cannot be cut off. However, the vertical magnetic field generated by the coil plane or curved surface where the conductor is located is directed to the radial direction of the rotor, and these electromagnetic principles also indicate the fact that the magnetic field is the vector sum of the fields generated by each infinitesimal part of the electric wire alone, so that the vertical magnetic field (countless magnetic lines of force in imagination) of each coil in the whole motor can be divided, so that the rotating magnetic field of the whole motor stator circumference is divided into two parts along the axial direction, one part corresponds to the first rotor and the other part corresponds to the second rotor, and although the current of the stator winding cannot be divided, the magnetic field can be divided vertically. The invention also provides and applies the method for dividing the rotating magnetic field of the integral stator of the alternating current motor along the coil vertical direction for differential design for the first time. Based on the principle, for a turn of coil, when the loads of the two rotor output shafts are balanced, the rotating speeds of the two rotors are equivalent, the voltage shared by the left half-part coil (the straight conductor 301+ the left end part + the straight conductor 302) and the right half-part coil (the straight conductor 303+ the right end part + the straight conductor 304) is half of the voltage of the turn of coil, when the loads of the two rotors are unbalanced, the rotating speed of the rotor with heavy load is reduced to reduce the inductance of the corresponding stator magnetic core, the voltage of the corresponding left half-part or right half-part coil is reduced to reduce the power and rotating speed of the rotor with heavy load, the rotating speed of the rotor with light load is increased to increase the inductance, the shared voltage is increased, and the power and rotating speed are increased, at this time, for a single turn, when a plurality of turns are connected in series to form a winding and form a rotating magnetic field with three phases or more than three phases, the voltage distribution rule, at this time, a differential function of automatic reverse load sensing voltage distribution is realized between the output shafts of the two rotors, namely, the voltage shared by the stator winding straight conductors of the corresponding parts of the different rotors is in positive correlation with the inductance of the winding and in reverse correlation with the load of the rotors, namely: and the axial corresponding relation of the turn inductance of the stator magnetic core caused by the differential speed of the first rotor and the second rotor is in corresponding relation with the voltage.
Fig. 5 shows another type of bearing (610) to butt-joint the contact parts of two rotors, fig. 6 is a schematic structural diagram of the bearing 610, both ends of the bearing 610 are cylindrical structures, round outer sleeves 611 and 612 are tightly matched with the concave parts of the two rotors, and an inner core (613) of a middle cylindrical part of the bearing can freely rotate along with the bearing, and the bearing has the advantages that the weight consistency of both sides is good after the bearing is matched with the two rotors, and dynamic balance is facilitated.
Example 2
A differential motor with coaxial opposed rotors comprises the differential motor with coaxial opposed rotors, wherein a first output shaft of the differential motor outputs power to the outside through a speed reducer, and a second output shaft of the differential motor outputs power to the outside through another speed reducer, as shown in figure 8.
The invention also provides a coaxial opposed rotor differential motor, and an electronic control module is also assembled in a motor shell, so that the coaxial opposed rotor differential motor is beneficial to detecting and controlling the current of a stator winding, realizing compact integrated design and reducing electromagnetic pollution and signal and energy transmission loss.
In a second aspect, a method of voltage control for a coaxial opposed-rotor differential electric machine is provided.
Example 3
The voltage control method includes the following steps, as shown in fig. 9:
① obtains a first output shaft speed signal SP1 and a second output shaft speed signal SP2 by detecting the speed of the first output shaft and the second output shaft of the coaxial opposed rotor differential motor, transmits signals SP1 and SP2 to an electronic control unit ECU,
② the ECU compares the signals SP1 and SP2, judges whether the difference between the rotational speeds reflected by the two signals exceeds a preset set value,
③ when the difference between the two signals does not exceed the preset value, the ECU defaults to the difference, and continues to monitor the two signals SP1 and SP2 without regulating the supply voltage, when the difference between the two signals exceeds the preset value, the ECU regulates the supply voltage through the power converter, such as properly reducing the supply voltage of the power supply, to optimize the power supply of the differential motor with coaxial opposed rotors.
In a third aspect, a new energy automobile is provided.
Example 4
The new energy automobile adopts the coaxial line contraposition rotor differential motor of the first aspect of the invention, and achieves the following beneficial effects.
1. The differential control motor provided by the invention adopts an alternating current motor structure, is firm and reliable, strong in durability, strong in technical universality, simplified in structure, improved in operation reliability, beneficial to large-scale industrialization and reduced in cost.
2. The alternating current motor has high technical maturity, is easy to popularize, reduces the industrial input cost and shortens the construction period.
3. The permanent magnet is saved, the cost and the process difficulty are saved, the mining resources are saved, and the environmental protection problem caused by rare earth mining is reduced.
4. And a mechanical differential is omitted, so that the structural cost is reduced, the weight is reduced, and the light weight is facilitated.
5. The circuit structure is simpler, and the number of peripheral driving elements is less.
The technical scheme of the invention provides a new technical view angle and development space for the technical field of vehicle and related motor control, and also opens up a new technical development space for hybrid power systems and the like. The embodiments of the present invention are only used for illustrating the technical solutions of the present invention, and are not limited to the present invention, and other embodiments or other combinations obtained by equivalent substitution and non-inventive work fall within the scope of the present invention, which is defined by the claims.
Claims (5)
1. A coaxial opposed rotor differential motor is characterized by comprising;
a motor housing, a stator, a first rotor and a second rotor in a coaxial line assembly in an opposed form, wherein,
the stator is a stator of an asynchronous motor and comprises a stator magnetic core and a stator winding, the stator is assembled in a motor shell, the stator winding is assembled in a slot circuit of the stator magnetic core, the length of a straight conductor part of the stator winding is equal to the sum of the axial length of the effective magnetic core of the first rotor and the axial length of the effective magnetic core of the second rotor, and a magnetic field generated by the stator winding is shared by the first winding and the second winding,
the first rotor and the second rotor are both rotor structures of an asynchronous motor, the electrical parameters of the first rotor and the second rotor are the same, the sum of the axial length of the effective magnetic core of the first rotor and the axial length of the effective magnetic core of the second rotor is equal to the axial length of the effective magnetic core of the stator, a first output shaft is arranged at the left end of the first rotor shaft, a second output shaft is arranged at the right end of the second rotor shaft,
the configuration form of the axial right end of the first rotor and the axial left end of the second rotor is as follows:
① the first rotor axial stop is designed to clamp the first output shaft axially only by the motor casing axial left end housing, the second rotor axial stop is designed to clamp the second output shaft axially only by the motor casing axial right end housing, the first rotor axial right end is axially aligned with the second rotor axial left end leaving an air gap, the air gap width is no greater than 1 mm, flexible free running is permitted between the first rotor and the second rotor,
② wherein the first rotor axial limit is designed to clamp the first output shaft axially by the left end housing of the motor housing, the second rotor axial limit is designed to clamp the second output shaft axially by the right end housing of the motor housing, the right end of the first rotor axial limit is axially aligned with the left end of the second rotor axial limit and the bearings are supported by each other, the bearings are mounted invisibly, that is, a concave part for bearing the bearings is left at the center part of the right end of the first rotor axial limit and/or the left end of the second rotor axial limit, the periphery of the concave part is the right end part of the effective magnetic core of the first rotor or the left end part of the effective magnetic core of the second rotor, when the first rotor and the second rotor are assembled into the motor housing, the distance between the right end of the first rotor axial limit and the left end of the second rotor axial limit is not more than 1 mm, and the first rotor and the second rotor allow free running,
when the stator winding is connected with an alternating current power supply, a rotating magnetic field generated by the stator drives the first rotor and the second rotor to rotate, when the resisting moments of the first output shaft and the second output shaft are balanced, the rotating magnetic field drives the first rotor and the second rotor to run at a constant speed, when the resisting moments of the first output shaft and the second output shaft are unbalanced, the rotating speed of the rotor with large resisting moment is reduced to reduce the inductance of the corresponding stator part, the equivalent voltage of the stator winding conductor corresponding to the stator part is reduced, the rotating speed of the rotor with small resisting moment is increased to increase the inductance of the corresponding stator part, the equivalent voltage of the stator winding conductor corresponding to the stator part is increased, and the first output shaft and the second output shaft face the resisting moment to realize a differential effect.
2. The coaxial opposed-rotor differential electric machine of claim 1 further comprising,
the first output shaft outputs power outwards through one speed reducer, and the second output shaft outputs power outwards through the other speed reducer.
3. The coaxial opposed-rotor differential electric machine according to claim 1 or 2, further equipped with an electronic control module inside the machine housing for controlling the current of the stator windings, achieving a compact integrated design, reducing electromagnetic pollution and signal and energy transmission losses.
4. A voltage control method of a coaxial line opposed rotor differential motor is characterized by comprising the steps of,
① obtains a first output shaft rotating speed signal SP1 and a second output shaft rotating speed signal SP2 by detecting the rotating speeds of a first output shaft and a second output shaft of the coaxial line opposite rotor differential motor, transmits the signals SP1 and SP2 to an electronic control unit ECU,
②, the ECU compares the signals SP1 and SP2, judges whether the difference between the rotational speeds reflected by the two signals exceeds a preset set value,
③ when the difference between the two signals does not exceed the preset value, the ECU defaults the difference and does not regulate the power supply voltage, when the difference between the two signals exceeds the preset value, the ECU regulates the power supply voltage through the power converter, so that the power supply of the coaxial line opposed rotor differential motor is optimized.
5. A new energy automobile, characterized by comprising the coaxial opposed-rotor differential motor according to claim 1, 2 or 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020103266587 | 2020-04-23 | ||
| CN202010326658 | 2020-04-23 |
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| CN111509937A true CN111509937A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010418573.1A Withdrawn CN111546884A (en) | 2020-04-23 | 2020-05-21 | Hybrid four-wheel drive configuration method for electrically powering internal combustion power vehicle |
| CN202010419160.5A Withdrawn CN111546905A (en) | 2020-04-23 | 2020-05-21 | Differential lock control module and control method thereof |
| CN202010435226.XA Withdrawn CN111509937A (en) | 2020-04-23 | 2020-05-21 | Coaxial line opposed rotor differential motor and new energy automobile |
| CN202010415519.1A Active CN111509936B (en) | 2020-04-23 | 2020-05-21 | Quasi-differential lock sum-difference rate control system, control method and automobile |
| CN202010499417.2A Withdrawn CN111884563A (en) | 2020-04-23 | 2020-06-04 | Quasi-differential lock sum-difference rate control system and control method |
| CN202010956796.3A Withdrawn CN112072819A (en) | 2020-04-23 | 2020-09-12 | Multi-torque motor and control and starting method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010418573.1A Withdrawn CN111546884A (en) | 2020-04-23 | 2020-05-21 | Hybrid four-wheel drive configuration method for electrically powering internal combustion power vehicle |
| CN202010419160.5A Withdrawn CN111546905A (en) | 2020-04-23 | 2020-05-21 | Differential lock control module and control method thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010415519.1A Active CN111509936B (en) | 2020-04-23 | 2020-05-21 | Quasi-differential lock sum-difference rate control system, control method and automobile |
| CN202010499417.2A Withdrawn CN111884563A (en) | 2020-04-23 | 2020-06-04 | Quasi-differential lock sum-difference rate control system and control method |
| CN202010956796.3A Withdrawn CN112072819A (en) | 2020-04-23 | 2020-09-12 | Multi-torque motor and control and starting method |
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| Country | Link |
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| WO (1) | WO2021213499A1 (en) |
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| CN112564445A (en) * | 2020-12-07 | 2021-03-26 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Permanent magnet synchronous motor, electric automobile and power upgrading method of permanent magnet synchronous motor |
| CN115514180A (en) * | 2022-08-22 | 2022-12-23 | 戴启迪 | A differential speed double output motor |
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| CN111546884A (en) * | 2020-04-23 | 2020-08-18 | 佛山中锦微电科技有限公司 | Hybrid four-wheel drive configuration method for electrically powering internal combustion power vehicle |
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Also Published As
| Publication number | Publication date |
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| CN111509936A (en) | 2020-08-07 |
| WO2021213499A1 (en) | 2021-10-28 |
| CN111546905A (en) | 2020-08-18 |
| CN111546884A (en) | 2020-08-18 |
| CN112072819A (en) | 2020-12-11 |
| CN111509936B (en) | 2022-02-18 |
| CN111884563A (en) | 2020-11-03 |
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