CN109038871B - Switched reluctance motor with segmented rotor - Google Patents
Switched reluctance motor with segmented rotor Download PDFInfo
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- CN109038871B CN109038871B CN201811008802.1A CN201811008802A CN109038871B CN 109038871 B CN109038871 B CN 109038871B CN 201811008802 A CN201811008802 A CN 201811008802A CN 109038871 B CN109038871 B CN 109038871B
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- H—ELECTRICITY
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- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
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- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
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- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
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Abstract
The invention discloses a switched reluctance motor with a segmented rotor. The motor consists of a stator, a rotor and a coil; the number of teeth of the stator is 9n, the number of poles of the rotor is m, the number of phases is 3, n is a natural number, and m is equal to 4n, 5n or 6 n; the rotor is composed of m rotor cores and 1 non-magnetic-conduction support frame, and the rotor cores are fixed on the non-magnetic-conduction support frames; the stator teeth comprise 3n wide teeth and 6n narrow teeth, the 9n stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 40 degrees/n, the difference between the wide teeth and the wide teeth is 120 degrees/n, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; each narrow tooth is wound with 1 coil, each wide tooth is not provided with a coil, the coils on two adjacent narrow teeth belong to the same phase winding, and the magnetic field polarities generated by all the coils are the same; each phase is a short magnetic circuit, and the iron core loss is small; the interphase magnetic circuit is only interlinked on the wide teeth, and the interphase coupling is weak. The motor of the invention has various rotor pole numbers, and the stator pole number and the rotor pole number can be conveniently selected to be matched according to specific application occasions so as to achieve the optimal output performance.
Description
Technical Field
The invention relates to a switched reluctance motor with a segmented rotor, belonging to the technical field of switched reluctance motors of motors.
Background
The stator and the rotor of the switched reluctance motor are of a double-salient-pole structure, and the rotor is free of windings and permanent magnets, so that the switched reluctance motor has the characteristics of simple and firm structure, low cost, high temperature resistance, high-speed adaptability and the like, and is widely applied to military and civil fields such as aerospace, precision machining, electric automobiles and the like.
However, due to the salient pole structure of the rotor, the wind loss of the switched reluctance motor is larger, the vibration noise problem is further aggravated, and the application of the switched reluctance motor in the low noise field is weakened. For this reason, a so-called Segmented rotor Switched Reluctance Motor (Segmented Switched Reluctance Motor) has been proposed to reduce windage loss and reduce noise. The rotor of the segmented rotor switched reluctance motor is of a cylindrical structure, the outer circular surface is smooth and flat, and wind friction loss can be effectively reduced. However, the traditional segmented rotor switched reluctance motor usually adopts classical structures such as 6/4, 8/6, 12/8 and 12/10 poles, and based on the requirement of an operation mechanism, the inter-phase magnetic circuits of the structures have strong coupling, the inter-phase mutual inductance is large, and the mutual inductance torque generated by the mutual inductance is also large, so that the torque ripple is increased; in addition, inter-phase coupling also results in reduced fault tolerance and reliability of the motor.
Therefore, the application provides a segmented rotor switched reluctance motor with 9n stators and 4n, 5n and 6n rotors, which has a short magnetic circuit, small iron loss, easy processing and assembly of a centralized winding structure and low copper consumption; in order to reduce interphase coupling, the magnetic poles of the interphase common magnetic circuit adopt a wide tooth structure, the influence of the mutual inductance on the output torque is small, and the reliability and the fault tolerance are improved; in addition, the novel stator and rotor matching form enriches the topology of the switched reluctance motor structure.
Disclosure of Invention
The invention provides a switched reluctance motor with a segmented rotor, aiming at overcoming the defects of the prior art. The motor consists of a stator, a rotor and a coil; the number of teeth of the stator is 9n, the number of poles of the rotor is m, the number of phases is 3, n is a natural number, and m is equal to 4n, 5n or 6 n; the rotor is composed of m rotor cores and 1 non-magnetic-conduction support frame, and the rotor cores are fixed on the non-magnetic-conduction support frames; the stator teeth comprise 3n wide teeth and 6n narrow teeth, the 9n stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 40 degrees/n, the difference between the wide teeth and the wide teeth is 120 degrees/n, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; each narrow tooth is wound with 1 coil, each wide tooth is not provided with a coil, the coils on two adjacent narrow teeth belong to the same phase winding, and the magnetic field polarities generated by all the coils are the same; each phase of magnetic circuit is of a short magnetic circuit structure, and the iron core loss is small; in addition, the interphase magnetic circuit is only interlinked on the wide teeth, and the interphase magnetic circuit coupling is weak; the motor of the invention has various rotor pole numbers, and the stator pole number and the rotor pole number can be conveniently selected to be matched according to specific application occasions so as to achieve the optimal output performance.
In order to solve the technical problems, the invention adopts the technical scheme that:
a switched reluctance motor with a segmented rotor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, the number of teeth of the stator is 9n, and n is a natural number; the stator teeth comprise 3n wide teeth and 6n narrow teeth, the 9n stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 40 degrees/n, the difference between the wide teeth and the wide teeth is 120 degrees/n, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6n narrow teeth are equal, and the tooth widths of 3n wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 6 n; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 3 n; 3n of said coil strings are spatially separated by 120 °/n;
when n =1, the motor has 3 coil strings, and each coil string is independently connected into a phase winding, so that three phases are formed;
when n is more than or equal to 2, the motor has 3n coil strings, and the n coil strings with the spatial difference of 360 DEG/n are connected in series or in parallel to form a one-phase winding and three phases;
the number of poles of the rotor is m, m is equal to 4n, 5n or 6n, namely the motor has three stator and rotor combination forms, namely 9n/4n, 9n/5n and 9n/6 n;
the rotor comprises m rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is m; m teeth of the non-magnetic conductive support frame are uniformly distributed, and the difference between the teeth is 360 degrees/m; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
the control mode of the motor is the same as that of the traditional switched reluctance motor, and the three-phase windings are alternately conducted and excited to generate torque.
The invention has the beneficial effects that: the invention provides a switched reluctance motor with a segmented rotor, and by adopting the technical scheme of the invention, the following technical effects can be achieved:
(1) the number of the stator teeth is the same, and the number of the rotor poles is specifically three, so that the number of the stator poles and the number of the rotor poles are selected to be matched according to application occasions, and the output performance of the motor is optimal;
(2) the interphase windings are mutually isolated, the reliability is high, and the interphase magnetic circuit is only interlinked through the wide teeth without the windings, so the coupling strength is small.
Drawings
Fig. 1 is a schematic two-dimensional structure diagram of an 9/4-pole segmented-rotor switched reluctance motor according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of the distribution of magnetic lines generated by the current of the a-phase winding when the rotor is in the non-aligned position according to the first embodiment of the present invention.
Fig. 3 is a schematic diagram of the distribution of magnetic lines generated by the current of the a-phase winding when the rotor is in the aligned position according to the first embodiment of the present invention.
Fig. 4 shows the phase inductance finite element calculation result according to the first embodiment of the present invention.
FIG. 5 shows the phase torque finite element calculation results of the first embodiment of the present invention.
Fig. 6 is a schematic two-dimensional structure diagram of an 9/5 pole segmented rotor switched reluctance motor according to a second embodiment of the present invention.
Fig. 7 shows the phase inductance finite element calculation results of the second embodiment of the present invention.
FIG. 8 shows the phase torque finite element calculation results of the second embodiment of the present invention.
Fig. 9 is a schematic two-dimensional structure diagram of an 9/6-pole segmented rotor switched reluctance motor according to a third embodiment of the present invention.
Fig. 10 shows the phase inductance finite element calculation result of the third embodiment of the present invention.
FIG. 11 shows the phase torque finite element calculation results of the third embodiment of the present invention.
Fig. 12 is a schematic two-dimensional structure diagram of an 18/8-pole segmented rotor switched reluctance motor according to a fourth embodiment of the present invention.
Fig. 13 is a schematic two-dimensional structure diagram of an 18/10-pole segmented rotor switched reluctance motor according to a fifth embodiment of the present invention.
Fig. 14 is a schematic two-dimensional structure diagram of an 18/12-pole segmented rotor switched reluctance motor according to a sixth embodiment of the present invention.
Description of reference numerals: in fig. 1 to 14, 1 is a stator, 2 is a rotor core, 3 is a coil, 4 is a non-magnetic-conductive support frame, 5 is a schematic diagram of magnetic lines generated by a phase winding current when a rotor of an 9/4-pole segmented rotor switched reluctance motor is in an unaligned position, 6 is a schematic diagram of magnetic lines generated by a phase winding current when a rotor of a 9/4-pole segmented rotor switched reluctance motor is in an aligned position, 7 is a phase inductance characteristic curve of a 9/4-pole segmented rotor switched reluctance motor, 8 is a phase torque characteristic curve of a 9/4-pole segmented rotor switched reluctance motor, 9 is a phase inductance characteristic curve of a 9/5-pole segmented rotor switched reluctance motor, 10 is a phase torque characteristic curve of a 9/5-pole segmented rotor switched reluctance motor, 11 is a phase inductance characteristic curve of a 9/6-pole segmented rotor switched reluctance motor, and 12 is a phase torque characteristic curve of a 9/6-pole segmented rotor switched reluctance motor.
Detailed Description
The technical scheme of the switched reluctance motor with the segmented rotor is described in detail below with reference to the attached drawings:
fig. 1 is a schematic two-dimensional structure diagram of an 9/4-pole segmented rotor switched reluctance motor according to a first embodiment of the present invention, where 1 is a stator, 2 is a rotor core, 3 is a coil, and 4 is a non-magnetic support frame.
The 9/4-pole segmented rotor switched reluctance motor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, n =1, and the number of stator teeth is 9; the stator teeth comprise 3 wide teeth and 6 narrow teeth, 9 stator teeth are uniformly arranged, the difference between adjacent stator teeth is 40 degrees, the difference between the wide teeth and the wide teeth is 120 degrees, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6 narrow teeth are equal, and the tooth widths of 3 wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 6; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 3; 3 of said coil strings are spatially separated by 120 °;
the rotor comprises 4 rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is 4; 4 teeth of the non-magnetic conductive support frame are uniformly distributed, and the difference between the teeth is 90 degrees; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
each coil string is independently connected into a phase winding, and the three phases are A, B, C phases respectively; the magnetic field polarities generated by all the coils are the same, namely the magnetic field polarities generated by the 6 coils of the three-phase winding are arranged in an NNNN or SSSSSSSS mode;
the A, B, C phase winding is driven by a three-phase asymmetric half-bridge power converter, and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
Fig. 2 and fig. 3 are schematic diagrams of distribution of magnetic lines generated by a-phase winding current when the rotor of the 9/4-pole segmented rotor switched reluctance motor is in the misaligned position and the aligned position, respectively. Wherein, 5 is the magnetic line of force that A phase winding current produced when the rotor is in the position of misalignment, 6 is the magnetic line of force that A phase winding current produced when the rotor is in the position of alignment.
Defining the rotor teeth and the teeth as non-aligned positions when the center lines of the rotor teeth and the teeth coincide with the center of the armature stator teeth, namely the rotor position is zero degree; the rotor tooth center line is aligned when coinciding with the armature stator tooth center line, i.e. the mechanical angle of the rotor position is 45 °.
In the non-aligned position, the magnetic force line generated by the phase A has two magnetic circuits which are closed through a narrow tooth, a wide tooth adjacent to the narrow tooth, two rotor cores and an air gap; because the magnetic resistance of the magnetic circuit between the two rotor cores is large, the magnetic resistance of the magnetic circuit is maximum at the moment, and the phase inductance is minimum;
in the alignment position, the magnetic force line generated by the phase A also has two magnetic circuits which are closed through the narrow teeth, the wide teeth adjacent to the narrow teeth, 1 rotor core and the air gap, and at the moment, the magnetic resistance of the magnetic circuit is minimum, and the phase inductance is maximum;
B. when the phase C winding is conducted, the generated magnetic lines are distributed the same as the phase A, the phase difference is 120 degrees in space, and the magnetic circuits between the phase and the phase are only interlinked on the wide teeth, so that the coupling is weak.
As shown in fig. 4 and 5, the finite element calculation results of the phase inductance and the phase torque of the 9/4 pole segmented rotor switched reluctance motor are shown, respectively. Where 7 is a phase inductance characteristic curve of the 9/4-pole segmented rotor switched reluctance motor, and 8 is a phase torque characteristic curve of the 9/4-pole segmented rotor switched reluctance motor.
The parameters of the 9/4 pole segmented rotor switched reluctance motor are as follows: the outer diameter of the stator is 130mm, the inner diameter of the stator is 76.6mm, the outer diameter of the rotor is 76mm, the rotating shaft is 32mm, the axial length is 120mm, and the number of turns of each tooth coil is 50; the pole arc angle of the wide teeth is 30 degrees, the pole arc angle of the narrow teeth is 20 degrees, and the pole arc coefficient of the rotor teeth is 0.833. When the phase a winding current is 5A, the phase inductance and phase torque are as shown.
The characteristic curves of the phase inductance and the phase torque of the motor are similar to those of a switched reluctance motor with a traditional structure, the change rate of the inductance along with the position angle of a rotor is improved, the output torque is favorably improved, and the torque dead zone is reduced; in addition, the torque characteristic curve shows that the output torque has a concave phenomenon in the interval of [12 degrees and 30 degrees ], but the output torque can be improved through the optimized design of the motor.
Fig. 6 is a schematic two-dimensional structure diagram of an 9/5-pole segmented rotor switched reluctance motor according to a second embodiment of the present invention, where 1 is a stator, 2 is a rotor core, 3 is a coil, and 4 is a non-magnetic support frame.
The 9/5-pole segmented rotor switched reluctance motor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, n =1, and the number of stator teeth is 9; the stator teeth comprise 3 wide teeth and 6 narrow teeth, 9 stator teeth are uniformly arranged, the difference between adjacent stator teeth is 40 degrees, the difference between the wide teeth and the wide teeth is 120 degrees, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6 narrow teeth are equal, and the tooth widths of 3 wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 6; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 3; 3 of said coil strings are spatially separated by 120 °;
the rotor comprises 5 rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is 5; 5 teeth of the non-magnetic conductive support frame are uniformly distributed, and the difference between the teeth is 72 degrees; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
each coil string is independently connected into a phase winding, and the three phases are A, B, C phases respectively; the magnetic field polarities generated by all the coils are the same, namely the magnetic field polarities generated by the 6 coils of the three-phase winding are arranged in an NNNN or SSSSSSSS mode;
the A, B, C phase winding is driven by a three-phase asymmetric half-bridge power converter, and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
Defining the rotor teeth and the teeth as non-aligned positions when the center lines of the rotor teeth and the teeth coincide with the center of the armature stator teeth, namely the rotor position is zero degree; the rotor tooth center line is aligned when coinciding with the armature stator tooth center line, i.e. the mechanical angle of the rotor position is 36 °.
In the misalignment position, the magnetic force line generated by each phase has two magnetic circuits which are closed by narrow teeth, wide teeth adjacent to the narrow teeth, two rotor cores and air gaps; because the magnetic resistance of the magnetic circuit between the two rotor cores is large, the magnetic resistance of the magnetic circuit is maximum at the moment, and the phase inductance is minimum;
in the alignment position, the magnetic force line generated by each phase also has two magnetic circuits which are closed through the narrow teeth, the adjacent wide teeth, 1 rotor core and the air gap, and at the moment, the magnetic resistance of the magnetic circuit is minimum, and the phase inductance is maximum;
the magnetic lines of force generated by the three phases are distributed the same, have a phase difference of 120 degrees in space, and are only interlinked on the wide teeth, so that the coupling is weak.
As shown in fig. 7 and 8, the finite element calculation results of the phase inductance and the phase torque of the 9/5 pole segmented rotor switched reluctance motor are shown, respectively. Where 7 is a phase inductance characteristic curve of the 9/5-pole segmented rotor switched reluctance motor, and 8 is a phase torque characteristic curve of the 9/5-pole segmented rotor switched reluctance motor.
The parameters of the 9/5 pole segmented rotor switched reluctance motor are as follows: the outer diameter of the stator is 130mm, the inner diameter of the stator is 76.6mm, the outer diameter of the rotor is 76mm, the rotating shaft is 32mm, the axial length is 120mm, and the number of turns of each tooth coil is 50; the pole arc angle of the wide teeth is 30 degrees, the pole arc angle of the narrow teeth is 20 degrees, and the pole arc coefficient of the rotor teeth is 0.833. When the phase a winding current is 5A, the phase inductance and phase torque are as shown.
The characteristic curves of phase inductance and phase torque of the motor are similar to those of a switched reluctance motor with a traditional structure; the change rate of the inductance along with the position angle of the rotor is improved, so that the output torque is improved, and the torque dead zone is reduced; in addition, the torque characteristic curve shows that the output torque characteristic of the motor is better than that of an 9/4 pole structure.
Fig. 9 is a schematic two-dimensional structure diagram of an 9/6-pole segmented rotor switched reluctance motor according to a third embodiment of the present invention, where 1 is a stator, 2 is a rotor core, 3 is a coil, and 4 is a non-magnetic-conductive support frame.
The 9/6-pole segmented rotor switched reluctance motor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, n =1, and the number of stator teeth is 9; the stator teeth comprise 3 wide teeth and 6 narrow teeth, 9 stator teeth are uniformly arranged, the difference between adjacent stator teeth is 40 degrees, the difference between the wide teeth and the wide teeth is 120 degrees, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6 narrow teeth are equal, and the tooth widths of 3 wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 6; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 3; 3 of said coil strings are spatially separated by 120 °;
the rotor comprises 6 rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is 6; 6 teeth of the non-magnetic support frame are uniformly distributed, and the difference between the teeth is 60 degrees; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
each coil string is independently connected into a phase winding, and the three phases are A, B, C phases respectively; the magnetic field polarities generated by all the coils are the same, namely the magnetic field polarities generated by the 6 coils of the three-phase winding are arranged in an NNNN or SSSSSSSS mode;
the A, B, C phase winding is driven by a three-phase asymmetric half-bridge power converter, and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
Defining the rotor teeth and the teeth as non-aligned positions when the center lines of the rotor teeth and the teeth coincide with the center of the armature stator teeth, namely the rotor position is zero degree; the rotor tooth center line is aligned when coinciding with the armature stator tooth center line, i.e. the mechanical angle of the rotor position is 30 °.
In the misalignment position, the magnetic force line generated by each phase has two magnetic circuits which are closed by narrow teeth, wide teeth adjacent to the narrow teeth, two rotor cores and air gaps; because the magnetic resistance of the magnetic circuit between the two rotor cores is large, the magnetic resistance of the magnetic circuit is maximum at the moment, and the phase inductance is minimum;
in the alignment position, the magnetic force line generated by each phase also has two magnetic circuits which are closed through the narrow teeth, the adjacent wide teeth, 1 rotor core and the air gap, and at the moment, the magnetic resistance of the magnetic circuit is minimum, and the phase inductance is maximum;
the magnetic lines of force generated by the three phases are distributed the same, have a phase difference of 120 degrees in space, and are only interlinked on the wide teeth, so that the coupling is weak.
As shown in fig. 10 and 11, the finite element calculation results of the phase inductance and the phase torque of the 9/6 pole segmented rotor switched reluctance motor are shown, respectively. Where 7 is a phase inductance characteristic curve of the 9/6-pole segmented rotor switched reluctance motor, and 8 is a phase torque characteristic curve of the 9/6-pole segmented rotor switched reluctance motor.
The parameters of the 9/6 pole segmented rotor switched reluctance motor are as follows: the outer diameter of the stator is 130mm, the inner diameter of the stator is 76.6mm, the outer diameter of the rotor is 76mm, the rotating shaft is 32mm, the axial length is 120mm, and the number of turns of each tooth coil is 50; the pole arc angle of the wide teeth is 30 degrees, the pole arc angle of the narrow teeth is 20 degrees, and the pole arc coefficient of the rotor teeth is 0.833. When the phase a winding current is 5A, the phase inductance and phase torque are as shown.
The characteristic curves of phase inductance and phase torque of the motor are similar to those of a switched reluctance motor with a traditional structure; the change rate of the inductance along with the position angle of the rotor is improved, so that the output torque is improved, and the torque dead zone is reduced; in addition, the torque characteristic curve shows that the output torque has a concave phenomenon in the interval of [9 degrees and 18 degrees ], but the output performance is not as good as that of the 9/5 structure because the motor is improved by the optimized design.
Fig. 12 is a schematic two-dimensional structure diagram of an 18/8-pole segmented rotor switched reluctance motor according to a fourth embodiment of the present invention, where 1 is a stator, 2 is a rotor core, 3 is a coil, and 4 is a non-magnetic-conductive support frame.
The 18/8-pole segmented rotor switched reluctance motor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, n =2, and the number of stator teeth is 18; the stator teeth comprise 6 wide teeth and 12 narrow teeth, the 18 stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 20 degrees, the difference between the wide teeth and the wide teeth is 60 degrees, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6 narrow teeth are equal, and the tooth widths of 3 wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 12; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 6; 6 of said coil strings are spatially 60 °;
the rotor comprises 8 rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is 8; 8 teeth of the non-magnetic support frame are uniformly distributed, and the difference between the teeth is 45 degrees; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
at the moment, the motor comprises 6 coil strings in total, 2 coil strings with a spatial difference of 180 degrees are connected in series or in parallel to form a one-phase winding, and comprise three phases of A, B, C phases respectively; the magnetic field polarities generated by all the coils are the same, namely the magnetic field polarities generated by 12 coils of the three-phase winding are arranged in a full N or full S mode;
the A, B, C phase winding is driven by a three-phase asymmetric half-bridge power converter, and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
In the misalignment position, the magnetic force line generated by each phase has two magnetic circuits which are closed by narrow teeth, wide teeth adjacent to the narrow teeth, two rotor cores and air gaps; because the magnetic resistance of the magnetic circuit between the two rotor cores is large, the magnetic resistance of the magnetic circuit is maximum at the moment, and the phase inductance is minimum;
in the alignment position, the magnetic force line generated by each phase also has two magnetic circuits which are closed through the narrow teeth, the adjacent wide teeth, 1 rotor core and the air gap, and at the moment, the magnetic resistance of the magnetic circuit is minimum, and the phase inductance is maximum;
the magnetic lines of force generated by the three phases are distributed the same, the phase difference is 60 degrees in space, and the magnetic circuits between the phases are only interlinked on the wide teeth, so the coupling is weaker.
Fig. 13 is a schematic two-dimensional structure diagram of an 18/10-pole segmented rotor switched reluctance motor according to a fourth embodiment of the present invention, where 1 is a stator, 2 is a rotor core, 3 is a coil, and 4 is a non-magnetic support frame.
The 18/10-pole segmented rotor switched reluctance motor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, n =2, and the number of stator teeth is 18; the stator teeth comprise 6 wide teeth and 12 narrow teeth, the 18 stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 20 degrees, the difference between the wide teeth and the wide teeth is 60 degrees, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6 narrow teeth are equal, and the tooth widths of 3 wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 12; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 6; 6 of said coil strings are spatially 60 °;
the rotor comprises 10 rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is 10; 10 teeth of the non-magnetic support frame are uniformly distributed, and the difference between the teeth is 36 degrees; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
at the moment, the motor comprises 6 coil strings in total, 2 coil strings with a spatial difference of 180 degrees are connected in series or in parallel to form a one-phase winding, and comprise three phases of A, B, C phases respectively; the magnetic field polarities generated by all the coils are the same, namely the magnetic field polarities generated by 12 coils of the three-phase winding are arranged in a full N or full S mode;
the A, B, C phase winding is driven by a three-phase asymmetric half-bridge power converter, and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
In the misalignment position, the magnetic force line generated by each phase has two magnetic circuits which are closed by narrow teeth, wide teeth adjacent to the narrow teeth, two rotor cores and air gaps; because the magnetic resistance of the magnetic circuit between the two rotor cores is large, the magnetic resistance of the magnetic circuit is maximum at the moment, and the phase inductance is minimum;
in the alignment position, the magnetic force line generated by each phase also has two magnetic circuits which are closed through the narrow teeth, the adjacent wide teeth, 1 rotor core and the air gap, and at the moment, the magnetic resistance of the magnetic circuit is minimum, and the phase inductance is maximum;
the magnetic lines of force generated by the three phases are distributed the same, the phase difference is 60 degrees in space, and the magnetic circuits between the phases are only interlinked on the wide teeth, so the coupling is weaker.
Fig. 14 is a schematic two-dimensional structure diagram of an 18/12-pole segmented rotor switched reluctance motor according to a fourth embodiment of the present invention, where 1 is a stator, 2 is a rotor core, 3 is a coil, and 4 is a non-magnetic-conductive support frame.
The 18/12-pole segmented rotor switched reluctance motor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame;
the stator is in a salient pole structure, n =2, and the number of stator teeth is 18; the stator teeth comprise 6 wide teeth and 12 narrow teeth, the 18 stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 20 degrees, the difference between the wide teeth and the wide teeth is 60 degrees, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6 narrow teeth are equal, and the tooth widths of 3 wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 12; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 6; 6 of said coil strings are spatially 60 °;
the rotor comprises 12 rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is 12; 12 teeth of the non-magnetic conductive support frame are uniformly distributed, and the difference between the teeth is 30 degrees; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
at the moment, the motor comprises 6 coil strings in total, 2 coil strings with a spatial difference of 180 degrees are connected in series or in parallel to form a one-phase winding, and comprise three phases of A, B, C phases respectively; the magnetic field polarities generated by all the coils are the same, namely the magnetic field polarities generated by 12 coils of the three-phase winding are arranged in a full N or full S mode;
the A, B, C phase winding is driven by a three-phase asymmetric half-bridge power converter, and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
In the misalignment position, the magnetic force line generated by each phase has two magnetic circuits which are closed by narrow teeth, wide teeth adjacent to the narrow teeth, two rotor cores and air gaps; because the magnetic resistance of the magnetic circuit between the two rotor cores is large, the magnetic resistance of the magnetic circuit is maximum at the moment, and the phase inductance is minimum;
in the alignment position, the magnetic force line generated by each phase also has two magnetic circuits which are closed through the narrow teeth, the adjacent wide teeth, 1 rotor core and the air gap, and at the moment, the magnetic resistance of the magnetic circuit is minimum, and the phase inductance is maximum;
the magnetic lines of force generated by the three phases are distributed the same, the phase difference is 60 degrees in space, and the magnetic circuits between the phases are only interlinked on the wide teeth, so the coupling is weaker.
When n is more than or equal to 3, the coil still has the characteristics, 3n coil strings are provided, and n coil strings with the spatial difference of 360 DEG/n are connected in series or in parallel to form a one-phase winding, so that three phases are provided; the magnetic lines of force generated by the three phases are distributed in the same way, the spatial difference is 120 degrees/n, and the magnetic circuits between the phases are only interlinked on the wide teeth.
In summary, when the number of the stator teeth is the same, the pole numbers of the three rotors are specifically selected to be matched according to application occasions, so that the output performance of the motor is optimal;
in addition, the inter-phase windings are mutually isolated, the reliability is high, the inter-phase magnetic circuit is only interlinked through the wide teeth without the windings, the coupling strength is small, and the reliability and the fault tolerance are high.
Other advantages and modifications will readily occur to those skilled in the art, based upon the above description. Therefore, the present invention is not limited to the above specific examples, and a detailed and exemplary description of one aspect of the present invention will be given by way of example only. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (1)
1. A switched reluctance motor with a segmented rotor is a three-phase working motor and comprises a stator, a rotor and a coil; the rotor consists of a rotor iron core and a non-magnetic-conduction support frame; it is characterized in that the preparation method is characterized in that,
the stator is in a salient pole structure, the number of teeth of the stator is 9n, and n is a natural number; the stator teeth comprise 3n wide teeth and 6n narrow teeth, the 9n stator teeth are uniformly arranged, the difference between the adjacent stator teeth is 40 degrees/n, the difference between the wide teeth and the wide teeth is 120 degrees/n, and 2 narrow teeth are arranged between the wide teeth and the wide teeth; the tooth widths of 6n narrow teeth are equal, and the tooth widths of 3n wide teeth are equal;
each narrow tooth is wound with 1 coil, and the number of the coils is 6 n; 2 coils on two adjacent narrow teeth are connected in series or in parallel into 1 coil string, and the number of the coils is 3 n; 3n of said coil strings are spatially separated by 120 °/n;
when n =1, the motor has 3 coil strings, and each coil string is independently connected into a phase winding, so that three phases are formed;
when n is more than or equal to 2, the motor is provided with 3n coil strings, the n coil strings with the spatial difference of 360 DEG/n are connected in series or in parallel to form a one-phase winding, and three phases are formed;
the number of poles of the rotor is m, and m is equal to 4n, 5n or 6 n; namely, the motor has three combined forms of stators and rotors, namely 9n/4n, 9n/5n and 9n/6 n;
the rotor comprises m rotor cores and 1 non-magnetic-conduction support frame; the rotor core is of a fan-shaped structure, the non-magnetic-conductive support frame is of a salient pole structure, and the number of teeth is m; m teeth of the non-magnetic conductive support frame are uniformly distributed, and the difference between the teeth is 360 degrees/m; 1 rotor core is fixed between two adjacent teeth of the non-magnetic-conductive support frame; the rotor core and the non-magnetic conductive support frame form 1 smooth and continuous cylindrical surface;
and the three-phase windings are sequentially conducted in turn to generate torque so as to realize the operation of the motor.
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| CN110299770B (en) * | 2019-07-31 | 2024-10-01 | 上海电力大学 | Four-phase 4N/3N pole winding isolated fault-tolerant electro-magnetic doubly salient motor |
| CN111030327B (en) * | 2019-11-26 | 2022-03-15 | 北京动力机械研究所 | Switched reluctance motor capable of running at high speed |
| CN114825838A (en) * | 2021-01-19 | 2022-07-29 | 青岛中加特电气股份有限公司 | Sectional type switch reluctance motor |
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| CN101702562A (en) * | 2009-11-09 | 2010-05-05 | 南京航空航天大学 | Non-overlapped winding segmented rotor switched reluctance motor |
| CN103001433A (en) * | 2012-12-14 | 2013-03-27 | 江苏大学 | A Stator Hybrid Short Magnetic Circuit Magnetic Levitation Switched Reluctance Generator |
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| CN206349896U (en) * | 2016-11-22 | 2017-07-21 | 华晨汽车集团控股有限公司 | A kind of structure switch magnetic resistance motor of stator piecemeal two-phase 6/5 |
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| CN101702562A (en) * | 2009-11-09 | 2010-05-05 | 南京航空航天大学 | Non-overlapped winding segmented rotor switched reluctance motor |
| CN103001433A (en) * | 2012-12-14 | 2013-03-27 | 江苏大学 | A Stator Hybrid Short Magnetic Circuit Magnetic Levitation Switched Reluctance Generator |
| CN204615602U (en) * | 2015-04-29 | 2015-09-02 | 江苏大学 | Fault-tolerant four-phase switched reluctance motor for electric vehicle drive |
| CN206349896U (en) * | 2016-11-22 | 2017-07-21 | 华晨汽车集团控股有限公司 | A kind of structure switch magnetic resistance motor of stator piecemeal two-phase 6/5 |
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