CN116613951B - Segmented stator permanent magnet auxiliary cycloid reluctance motor and control method thereof - Google Patents
Segmented stator permanent magnet auxiliary cycloid reluctance motor and control method thereof Download PDFInfo
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- CN116613951B CN116613951B CN202310867947.1A CN202310867947A CN116613951B CN 116613951 B CN116613951 B CN 116613951B CN 202310867947 A CN202310867947 A CN 202310867947A CN 116613951 B CN116613951 B CN 116613951B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 71
- 230000005284 excitation Effects 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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
- H02K21/38—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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- 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
- H02K21/04—Windings on magnets for additional excitation ; Windings and magnets for additional excitation
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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
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
- H02P25/092—Converters specially adapted for controlling reluctance motors
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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
Abstract
The invention discloses a segmented stator permanent magnet auxiliary cycloid reluctance motor and a control method thereof, relating to the technical field of motors, wherein the motor comprises: the stator comprises a plurality of stator core blocks which are circumferentially arranged at intervals, two ends of the stator core blocks are provided with two magnetic poles, and the cross sections of the magnetic poles are in a pin gear structure; the rotor is arranged at the outer side of the stator and comprises a plurality of rotor core blocks which are circumferentially arranged at intervals, the inner side of the rotor is of a cycloidal gear structure, and the plurality of stator core blocks and the rotor are mutually matched to form a pin gear transmission structure; a plurality of permanent magnets, one permanent magnet is arranged between two magnetic poles of each stator core block and used for generating a permanent magnetic field; and the excitation windings are respectively wound on the stator core blocks and are used for generating an electric excitation magnetic field of the motor. The rotor has the characteristics of high output torque and low driving impedance, and the excitation mode of the stator is a mixed excitation mode of electric excitation and permanent magnet excitation, so that the air gap density is increased, the magnetic saturation degree of a stator core is reduced, and the torque density of the motor is improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a segmented stator permanent magnet auxiliary cycloid reluctance motor and a control method thereof.
Background
A conventional switched reluctance motor is a motor of a double salient structure, which has neither winding coils nor permanent magnets on a rotor, and whose switching performance is represented by operating in a continuous switching state, and whose reluctance performance is represented by motor operation following the principle of minimum reluctance. The starting torque is large, the structure is simple, the starting current is small, and the speed regulation range is wide, so that the starting torque is widely applied to the fields of aviation, aerospace, electric vehicles, household appliances and the like. Especially, the hub switch reluctance motor for the electric automobile has wide application prospect on the hub motor of the electric automobile, and the hub switch reluctance motor for the electric automobile is generally of an outer rotor structure. For switched reluctance motors, this is achieved by increasing the field power in order to obtain a greater output power and torque. Based on the traditional switch reluctance motor, permanent magnets are embedded to improve the performance of the switch reluctance motor. The torque density and the power density can be improved by embedding the permanent magnets, and the torque pulsation of the motor can be reduced.
The sectional stator switch reluctance motor is a novel switch reluctance motor, and a stator core of the motor adopts a modularized design, so that the motor has the advantages of simplicity in winding, convenience in installation and disassembly, high fault tolerance and the like. Compared with the traditional switch reluctance motor, the modularized stator switch reluctance motor has stronger fault tolerance, and when the stator core of the motor breaks down, only the stator block where the fault is located can be replaced or maintained, so that the cost of operation and maintenance of the motor is saved.
Under the condition of low rotating speed, the conventional switched reluctance motor often generates smaller torque-current ratio due to high saturation of the iron core.
Disclosure of Invention
The embodiment of the invention provides a segmented stator permanent magnet auxiliary cycloid reluctance motor and a control method thereof, which solve the problem that the torque current ratio generated by the traditional switched reluctance motor is always smaller due to the high saturation of an iron core under the condition of low rotating speed in the prior art.
The invention provides a segmented stator permanent magnet auxiliary cycloid reluctance motor, which comprises:
the stator comprises a plurality of stator core blocks which are circumferentially arranged at intervals, wherein the longitudinal section of each stator core block is of a C-shaped structure, two ends of each stator core block are provided with two magnetic poles, and the cross sections of the magnetic poles are of pin gear structures;
the rotor is arranged at the outer side of the stator and comprises a plurality of rotor core blocks arranged at intervals in the circumferential direction, the rotor is a cycloid outer rotor, the inner side of the rotor is of a cycloid wheel structure, and the plurality of stator core blocks and the rotor are mutually matched to form a pin gear transmission structure;
the permanent magnets are arranged between two magnetic poles of each stator core block and are used for generating a permanent magnetic field;
the plurality of excitation windings are respectively wound on the plurality of stator core blocks and are used for generating an electric excitation magnetic field of the motor, and the electric excitation magnetic field is in the same direction as the corresponding permanent magnetic field and is connected with the corresponding permanent magnetic field in parallel.
Preferably, the stator further comprises a stator filler, and a plurality of the stator core blocks are fixed by the stator filler; the stator filler is a non-magnetic conductive material.
Preferably, the rotor further comprises a plurality of rotor fillers, and one rotor filler is arranged between two adjacent rotor core blocks; a plurality of rotor core blocks are fixed by a plurality of rotor fillers; the rotor core block is a magnetic conduction strip, and the rotor filler is a non-magnetic conduction material.
Preferably, the magnetizing directions of the plurality of permanent magnets are all along the axial direction of the stator.
Preferably, the stator includes eight stator core blocks.
Preferably, eight excitation windings of eight stator core blocks form four-phase windings, and each phase winding is formed by connecting two excitation windings wound on diametrically opposite stator core blocks in series.
Preferably, the power converter further comprises a power converter, the power converter is a modified asymmetric half-bridge power converter; the asymmetric half-bridge power converter includes four sets of switching circuits including:
the first switch tube has its collector connected to the positive pole of the power supply and its emitter connected to one end of the winding;
the cathode of the first follow current diode is connected with the emitter of the first switch tube, and the anode of the first follow current diode is grounded;
the collector of the second switch tube is connected with the positive electrode of the power supply, and the emitter of the second switch tube is connected with the other end of the winding;
the cathode of the second follow current diode is connected with the emitter of the second switching tube, and the anode of the second follow current diode is grounded;
the third switching tube, its collector is connected with series midpoint of winding, its emitter is grounded;
the two ends of the winding of one phase are respectively connected with the collector electrode of the first switch Guan Sheji and the collector electrode of the second switch tube, and the midpoint of the series connection is connected with the collector electrode of the third switch tube.
A control method of a segmented stator permanent magnet auxiliary cycloid reluctance motor comprises the following steps:
measuring a plurality of exciting winding currents of the motor, an angle of a rotor and an actual rotation speed of the motor;
calculating a rotating speed error of the actual rotating speed and the set rotating speed of the motor through the actual rotating speed and the set rotating speed of the motor;
calculating to obtain a duty ratio through a rotating speed error;
obtaining a corresponding PWM control signal according to the duty ratio and the set control frequency;
obtaining an angle position control signal through the angle of the rotor and the set opening angle and closing angle;
obtaining a corresponding current chopping control signal through a plurality of exciting winding currents of the motor and the set maximum current;
performing AND operation on the PWM control signal, the angle position control signal and the current chopping control signal to obtain a total control signal;
the motor is controlled to rotate by the total control signal.
Preferably, the overall control signal is input to a modified asymmetric half-bridge power converter through which the motor is driven to rotate.
Compared with the prior art, the invention has the beneficial effects that:
the rotor is a cycloid outer rotor and has the characteristics of high output torque and low driving impedance. The stator and the rotor have cycloidal pin gear transmission relation, so that the motor is compact in structure and efficiency is improved, meanwhile, the excitation mode of the stator is a mixed excitation mode of electric excitation and permanent magnet excitation, air gap magnetic density is increased, the magnetic saturation degree of a stator core is reduced, and the torque density of the motor is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic three-dimensional structure of a segmented stator permanent magnet auxiliary cycloid reluctance motor of the present invention;
FIG. 2 is a schematic top cross-sectional view of a segmented stator permanent magnet auxiliary gerotor reluctance motor of the present invention;
FIG. 3 is a schematic diagram of the magnetic circuit of the segmented stator block of the present invention with electrical excitation and permanent magnet excitation;
FIG. 4 is a schematic diagram of the magnetic circuit of the segmented stator block of the present invention with only electrical excitation;
FIG. 5 is a schematic diagram of the magnetic circuit of a segmented stator block of the present invention when excited with only permanent magnets;
FIG. 6 is a flow chart diagram of a method of controlling a segmented stator permanent magnet assisted gerotor motor of the present invention;
FIG. 7 is a flow chart of a method of controlling a segmented stator permanent magnet assisted gerotor motor of the present invention;
FIG. 8 is a schematic diagram of a power converter according to the present invention;
FIG. 9 is a schematic diagram of the forward excitation state of the improved asymmetric half-bridge power converter of the present invention;
FIG. 10 is a schematic diagram of the forward freewheel state of the improved asymmetric half-bridge power converter of the present invention;
FIG. 11 is a schematic diagram of the reverse excitation state of the improved asymmetric half-bridge power converter of the present invention;
fig. 12 is a schematic diagram of the reverse freewheeling state of the improved asymmetric half-bridge power converter of the present invention.
In the figure: 1-stator, 11-stator core blocks, 12-stator filler, 2-rotor, 21-rotor core blocks, 22-rotor filler, 3-permanent magnet and 4-exciting winding.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the invention provides a segmented stator permanent magnet auxiliary cycloid reluctance motor, which comprises a stator 1, a rotor 2, a plurality of permanent magnets 3 and a plurality of exciting windings 4.
Fig. 2 is a schematic top cross-sectional view of a segmented stator permanent magnet auxiliary cycloidal reluctance motor according to the present invention, referring to fig. 2, a stator 1 is a segmented inner stator, which includes eight separate stator core blocks 11 and stator fillers 12 arranged circumferentially, the stator core blocks 11 are C-shaped structures, two ends in an axial direction have two radially outward magnetic poles, and a needle gear tooth structure is formed on a surface of the magnetic poles. Eight stator core blocks 11 are fixed into one stator body by a stator filler 12.
The rotor 2 is arranged at the outer side of the stator 1, the rotor 2 is a cycloid outer rotor, the inner side of the rotor 2 is of a cycloid wheel structure, the rotor 2 comprises a plurality of rotor core blocks 21 and rotor fillers 22, the rotor core blocks 21 are segmented cores, the rotor core blocks 21 are axially distributed magnetic guide strips, the sections of the rotor core blocks are closed patterns formed by circular arcs, cycloid wheel curves and parallel straight lines, the rotor core blocks are separated from the rotor fillers 22 to form the cycloid outer rotor, and the stator 1 and the rotor 2 form a pin gear transmission structure.
The rotor is a cycloid rotor, and has high output torque and low driving impedance at low speed.
The plurality of permanent magnets 3 are fixedly disposed between two poles of the plurality of stator core blocks 11, respectively, for generating permanent magnetic fields. The magnetizing directions of the plurality of permanent magnets 3 are along the axial direction, and the magnetizing directions of the permanent magnets 3 are the same.
The permanent magnet 3 of the motor is arranged between two poles of the stator block, and the saturation degree of the exciting magnetic field generated by the exciting winding is reduced by means of the permanent magnetic field generated by the permanent magnet 3, so that the equivalent air gap length of the motor is reduced, the exciting current of the winding is reduced, and the power density and the torque density of the motor are further improved.
The plurality of exciting windings 4 are respectively wound on the middle sections of the plurality of stator core blocks 11 and are used for generating an electric exciting magnetic field of the motor. The electric excitation magnetic field has the same direction as the corresponding permanent magnetic field and is connected in parallel with the corresponding permanent magnetic field.
The permanent magnetic field generated by the permanent magnet 3 of the motor can generate a closed magnetic circuit with the rotor only when the exciting winding is electrified, and the power current and the control strategy are consistent with those of the traditional switched reluctance motor.
In this embodiment, the stator filler 12 and the rotor filler 22 are both non-magnetically conductive materials.
The schematic diagram of the magnetic circuit of the stator block is shown in fig. 3 when the stator block is electrically excited and the permanent magnet is excited, at the moment, the magnetic conductive rotor block is close to the stator block where the conducting phase is located, the magnetic field is connected in parallel with the middle part of the stator block by the permanent magnet, and the magnetic field is closed along the stator block, the rotor block and the air gap.
In the segmented stator permanent magnet auxiliary cycloid reluctance motor, eight exciting windings form four-phase windings, and each phase winding is formed by connecting exciting windings wound on two radially opposite stator blocks in series. The schematic diagram of the magnetic circuit of the stator block is shown in fig. 4 when only electric excitation exists, at this time, the magnetic conductive rotor block is close to the stator block where the conducting phase exists, and the magnetic field is closed along the stator block, the rotor block and the air gap.
The schematic diagram of the magnetic circuit of the stator block of the invention is shown in fig. 5 when only the permanent magnet 3 is excited, the magnetic field generated by the permanent magnet 3 does not pass through an air gap, and the two poles of the stator block are closed with the middle part of the stator.
The motor adopts the modularized stator, and the exciting windings on each independent rotor block can be independently wound, so that the automatic winding operation is convenient to realize.
The motor interphase magnetic circuit and the circuit are independent, and have strong isolation capability and fault tolerance.
When the motor works, according to the minimum magnetic resistance principle, the magnetic field generated by the exciting phase winding is connected in parallel with the magnetic field generated by the permanent magnet on the stator block, and the rotor core block is pulled to the stator block where the exciting phase is positioned by closing the magnetic conduction rotor core block on the rotor, so that exciting torque is generated. Because the air gap of the motor is an average air gap different from the non-uniform air gap of the switch reluctance motor, the saturation degree of the iron core is reduced, the torque-current ratio under the condition of low rotating speed can be improved, and the motor has higher low-speed efficiency.
Meanwhile, referring to fig. 6 and 7, the invention provides a control scheme matched with the segmented stator permanent magnet auxiliary cycloid reluctance motor, which comprises the following specific steps:
step 1: measuring winding current of an electric machinei a ，i b ，i c ，i d Rotor angleθAnd rotation speedn；
Step 2: the measured motor speed is compared with a desired motor speedn * Comparing, wherein the obtained rotating speed difference value is used as the input of the PI controller;
step 3: taking the output of the PI controller as the duty ratio of the PWM controller, and outputting a corresponding PWM control signal by the PWM controller according to a given control frequency;
step 4: according to the rotor angle measured in step 1θGiven opening angleθ on Angle of turn offθ off Calculating by an angle position controller to obtain an angle position control signal;
step 5: the four-phase winding current measured in the step 1 is respectively matched with a given maximum current in a current chopping controlleri max Hysteresis comparison is carried out, and a corresponding current chopping control signal is output;
step 6: performing AND operation on the PWM control signal, the angle position control signal and the current chopping control signal, and taking the obtained total control signal as a driving signal of the power converter;
step 7: according to the obtained driving signal, the power converter is powered by a vehicle-mounted direct-current power supply to drive the segmented stator permanent magnet auxiliary cycloid reluctance motor to rotate.
The power converter is an improved asymmetric half-bridge power converter, the topological structure of the power converter is shown in fig. 8, the power converter comprises four groups of switch circuits, each group adopts three switch tubes and two freewheel diodes, and the power converter comprises:
the first switching tube S1, the collector of which is connected with the positive electrode of the power supply, and the emitter of which is connected with one end of the winding;
the cathode of the first follow current diode D1 is connected with the emitter of the first switching tube, and the anode of the first follow current diode D is grounded;
the collector of the second switch tube S5 is connected with the positive electrode of the power supply, and the emitter of the second switch tube S is connected with the other end of the winding;
a second freewheeling diode D5, the cathode of which is connected with the emitter of the second switching tube and the anode of which is grounded;
a third switching tube S9, the collector of which is connected with the series midpoint of the winding, and the emitter of which is grounded;
two ends of a phase winding are respectively connected with the collector electrodes of the first switch Guan Sheji and the second switch tube, and the midpoint of the series connection is connected with the collector electrodes of the third switch tube.
In this embodiment, phase a, phase B, phase C and Phase D are excitation windings, wherein two series-connected Phase a are one-Phase windings, two series-connected Phase B are one-Phase windings, two series-connected Phase C are one-Phase windings, and two series-connected Phase D are one-Phase windings, thereby forming a four-Phase winding.
When the rotor cycloid gear is in operation, the stator pole embedded in the rotor cycloid gear recess is called a main excitation pole, the excitation winding wound on the corresponding stator block is called a main excitation winding, and the stator pole and the excitation winding opposite to the main excitation winding are respectively called an auxiliary excitation pole and an auxiliary excitation winding. As the motor rotates, the windings referred to by the primary and auxiliary excitation windings change.
The improved asymmetric half-bridge power converter has four operating states, as shown in fig. 9-12, when the front part of the windings are used as the primary excitation windings, the following two operating states are adopted:
referring to fig. 9, the forward excitation state: at the moment, the first switching tube and the third switching tube are conducted, exciting current passes through the first switching tube, the main exciting winding and the third switching tube, and at the moment, exciting current does not exist in the auxiliary exciting winding;
referring to fig. 10, the forward freewheel state: at this time, the switching tube is completely turned off, and the winding current flows through the first freewheeling diode, the main exciting winding, the auxiliary exciting winding and the freewheeling diode of the second switching tube.
When the latter part of windings is used as the main exciting windings, the following two working states are adopted:
referring to fig. 11, the reverse excitation state: at the moment, the second switching tube and the third switching tube are conducted, exciting current passes through the second switching tube, the main exciting winding and the third switching tube, and at the moment, exciting current does not exist in the auxiliary exciting winding;
referring to fig. 12, the reverse freewheel state: at this time, the switching tube is completely turned off, and the winding current passes through the second freewheeling diode, the main exciting winding, the auxiliary exciting winding and the freewheeling diode of the first switching tube.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A segmented stator permanent magnet auxiliary cycloid reluctance motor comprising:
the stator (1) comprises a plurality of stator core blocks (11) which are circumferentially arranged at intervals, wherein the longitudinal section of each stator core block (11) is of a C-shaped structure, two ends of each stator core block are provided with two magnetic poles, and the cross sections of the magnetic poles are of a pin gear structure;
the rotor (2) is arranged at the outer side of the stator (1) and comprises a plurality of rotor core blocks (21) which are arranged at intervals in the circumferential direction, the rotor (2) is a cycloid outer rotor, the inner side of the rotor is of a cycloid wheel structure, and a plurality of stator core blocks (11) and the rotor (2) are mutually matched to form a pin gear transmission structure;
the permanent magnets (3) are arranged between two magnetic poles of each stator core block (11), and the permanent magnets (3) are used for generating permanent magnetic fields;
and the excitation windings (4) are respectively wound on the stator core blocks (11) and are used for generating an electric excitation magnetic field of the motor, and the electric excitation magnetic field is in the same direction as the corresponding permanent magnetic field and is connected with the corresponding permanent magnetic field in parallel.
2. A segmented stator permanent magnet assisted cycloidal reluctance machine according to claim 1, characterized in that the stator (1) further comprises a stator filling (12), a plurality of the stator core blocks (11) being fixed by the stator filling (12); the stator filler (12) is a non-magnetically permeable material.
3. A segmented stator permanent magnet assisted cycloidal reluctance machine according to claim 1, characterized in that the rotor (2) further comprises a plurality of rotor fillers (22), one of the rotor fillers (22) being arranged between two adjacent rotor core blocks (21); a plurality of the rotor core blocks (21) are fixed by a plurality of rotor fillers (22); the rotor core block (21) is a magnetic conduction strip, and the rotor filler (22) is a non-magnetic conduction material.
4. A segmented stator permanent magnet assisted cycloid reluctance machine according to claim 1, characterized in that the magnetizing direction of a plurality of said permanent magnets (3) is along the axial direction of the stator (1).
5. A segmented stator permanent magnet assisted cycloid reluctance machine according to claim 1, characterized in that the stator (1) comprises eight stator core blocks (11).
6. A segmented stator permanent magnet assisted cycloid reluctance machine according to claim 5, characterized in that eight field windings (4) of eight of said stator core blocks (11) constitute four phase windings, each phase winding being formed by a series connection of two field windings (4) wound on diametrically opposite stator core blocks (11).
7. The segmented stator permanent magnet assisted cycloidal reluctance machine of claim 6 further comprising a power converter which is a modified asymmetric half bridge power converter; the improved asymmetric half-bridge power converter includes four sets of switching circuits, the switching circuits including:
the first switch tube has its collector connected to the positive pole of the power supply and its emitter connected to one end of the winding;
the cathode of the first follow current diode is connected with the emitter of the first switch tube, and the anode of the first follow current diode is grounded;
the collector of the second switch tube is connected with the positive electrode of the power supply, and the emitter of the second switch tube is connected with the other end of the winding;
the cathode of the second follow current diode is connected with the emitter of the second switching tube, and the anode of the second follow current diode is grounded;
the third switching tube, its collector is connected with series midpoint of winding, its emitter is grounded;
the two ends of the winding of one phase are respectively connected with the collector electrode of the first switch Guan Sheji and the collector electrode of the second switch tube, and the midpoint of the series connection is connected with the collector electrode of the third switch tube.
8. A method of controlling a segmented stator permanent magnet assisted cycloid reluctance machine according to claim 7 comprising the steps of:
measuring currents of a plurality of exciting windings (4) of the motor, an angle of a rotor (2) and an actual rotational speed of the motor;
calculating a rotating speed error of the actual rotating speed and the set rotating speed of the motor through the actual rotating speed and the set rotating speed of the motor;
calculating to obtain a duty ratio through a rotating speed error;
obtaining a corresponding PWM control signal according to the duty ratio and the set control frequency;
obtaining an angle position control signal through the angle of the rotor (2) and the set opening angle and closing angle;
obtaining a corresponding current chopping control signal through the currents of a plurality of exciting windings (4) of the motor and the set maximum current;
performing AND operation on the PWM control signal, the angle position control signal and the current chopping control signal to obtain a total control signal;
the motor is controlled to rotate by the total control signal.
9. A method of controlling a segmented stator permanent magnet assisted cycloidal reluctance motor according to claim 8 wherein the overall control signal is input to a modified asymmetric half-bridge power converter through which the motor is driven to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310867947.1A CN116613951B (en) | 2023-07-17 | 2023-07-17 | Segmented stator permanent magnet auxiliary cycloid reluctance motor and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310867947.1A CN116613951B (en) | 2023-07-17 | 2023-07-17 | Segmented stator permanent magnet auxiliary cycloid reluctance motor and control method thereof |
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| CN116613951B true CN116613951B (en) | 2024-01-16 |
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| CN116613951A (en) | 2023-08-18 |
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