CN215733977U - Single Stator Single Rotor Dual System Low Pulsating Torque Permanent Magnet Brushless Motor - Google Patents
Single Stator Single Rotor Dual System Low Pulsating Torque Permanent Magnet Brushless Motor Download PDFInfo
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- CN215733977U CN215733977U CN202120044126.4U CN202120044126U CN215733977U CN 215733977 U CN215733977 U CN 215733977U CN 202120044126 U CN202120044126 U CN 202120044126U CN 215733977 U CN215733977 U CN 215733977U
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Abstract
本实用新型公开了一种单定子单转子双系统低脉动转矩永磁无刷电机。本实用新型包括机座、定子铁心、第一绕组、第二绕组、永磁磁钢、转子铁心和转轴，定子铁心固定于机座的内侧。转子铁心固定在转轴上，永磁磁钢固定在转子铁心上且位于定子铁心的内侧。第一绕组轴线与第二绕组轴线错开某一角度，在转子位置传感器及控制器的控制下，控制第一绕组组和第二绕组组按一定顺序通断电及电流方向。第一绕组组及第二绕组组电流分别与永磁转子相互作用产生二个幅值相近、频率相同且相位相差180°电角度的脉动转矩，实现抵消抑制，产生的二个平均转矩方向相同，大小相同，相互叠加对外输出，使输出的转矩中的脉动转矩分量明显降低。
The utility model discloses a single-stator, single-rotor, double-system, low-pulsation torque permanent magnet brushless motor. The utility model comprises a machine base, a stator iron core, a first winding, a second winding, a permanent magnet magnet, a rotor iron core and a rotating shaft, and the stator iron core is fixed on the inner side of the machine base. The rotor iron core is fixed on the rotating shaft, and the permanent magnet steel is fixed on the rotor iron core and is located inside the stator iron core. The axis of the first winding and the axis of the second winding are staggered by a certain angle, and under the control of the rotor position sensor and the controller, the first winding group and the second winding group are controlled to be switched on and off and the current direction in a certain order. The currents of the first winding group and the second winding group interact with the permanent magnet rotor to generate two pulsating torques with similar amplitudes, the same frequency and a phase difference of 180° electrical angle to achieve offset and suppression, resulting in two average torque directions. The same, the same size, superimposed on each other for external output, so that the pulsating torque component in the output torque is significantly reduced.
Description
Technical Field
The utility model belongs to the technical field of permanent magnet brushless motors, and particularly relates to a single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless motor.
Background
The permanent magnet brushless direct current motor is used as a novel speed regulating motor, and is characterized by simple structure, convenient manufacture, high power density, excellent speed regulating performance, reliable control and operation, high efficiency and the like, so the permanent magnet brushless direct current motor is widely applied to the fields of industry, agriculture, military, automobiles, household appliances and the like. However, since the operation of the motor depends on the electronic commutation of the winding current, as shown in fig. 9, the time taken for the off-phase winding current to drop from a stable value to zero and the time taken for the on-phase winding current to rise from zero to a stable value are different in the commutation process, so that the current of the motor fluctuates in the commutation process, thereby generating the ripple change of the motor torque, the torque ripple of the permanent magnet brushless dc motor is mainly the ripple torque component generated by the commutation of the winding current, the maximum ripple torque amplitude can reach 50% of the average torque, and the ripple torque has a waveform similar to a sine wave, as shown in fig. 1. Therefore, when the motor drives the load, the pulsating torque will act as an excitation source for the driveline, causing significant vibration and noise to the driveline. Affecting the further widespread use of the motor in areas with high performance requirements.
Patent "a brushless motor system of low ripple torque" of patent number "CN 105449958B" has proposed a permanent magnet brushless motor based on the low ripple torque of two stator birotors utility model patent, permanent magnet brushless motor to big medium-power provides an effective solution of low ripple torque permanent magnet brushless motor, moreover, it has been proved by the experiment that has fine suppression ripple torque's effect, nevertheless owing to adopt two stator birotors structure, make motor structure complicated relatively, and the volume increase, manufacturing cost increases, the application in the miniwatt occasion has been influenced. In addition, the electromagnetic parameters of the two systems are different due to the process problem of the double-stator and double-rotor structure, so that the mutual inhibition effect of the two pulsating torques is influenced to a certain extent.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless direct current motor. The utility model discloses a single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless direct current motor which comprises a stator core, a first winding group, a second winding group, a rotor core and excitation permanent magnet steel. The permanent magnet steel is fixed on the rotor iron core in a way that the S pole N pole, the one pole and the one pole are opposite, and the rotor formed by the magnet steel and the rotor iron core is arranged on the inner side of the stator iron core; the number n of magnetic pole pairs formed by permanent magnet steel on the rotor core is the same as the number n of magnetic pole pairs formed by the stator winding, and the pole pitch O is the same. A first winding group and a second winding group are arranged on the stator core; the first winding group, the rotor core and the magnetic steel form a first permanent magnet brushless direct current motor system, and the second winding group, the rotor core and the magnetic steel form a second permanent magnet brushless direct current motor system. The first winding group and the second winding group have the same electromagnetic parameters, namely, the same pitch and arrangement rule, the same phase number, the winding phase number m > is 3, the same winding turns, the same winding wire diameter and the like, are arranged on the inner side of the stator core, the first winding current and the second winding current respectively act on the rotor magnetic field to generate two average torque directions which are the same, and the two generated pulsating torques have the phase difference of 180 degrees of electrical angle.
As one of the preferable methods: the number of tooth grooves occupied by the first winding group and the second winding group on the inner side of the stator core is 1/2 of the total number of the tooth grooves, the first winding group is uniformly arranged along the tooth grooves on the inner side of the stator core to form m symmetrical windings, the windings form n pairs of poles, the winding axis of the second winding group and the winding axis corresponding to the first winding group are mutually staggered by a space angle theta, theta is 360 degrees/4 mn, the second winding group is also uniformly arranged along the tooth grooves on the inner side of the stator core to form m symmetrical windings, and the windings form n pairs of poles. The number n > of pole pairs of the motor is 1 natural number.
As a second preferred aspect: the first winding group and the second winding group respectively occupy 1/2 sections in a tooth slot on the inner side of the stator core, the first winding group and the second winding group are uniformly arranged in respective section slots to form m symmetrical windings, and the axis of the winding of the first winding group and the axis of the corresponding winding of the second winding group are staggered by a space angle of 180 degrees + theta or 180 degrees-theta along the circumferential direction of the stator core. θ is 360 °/(4 mn). The number n of pole pairs of the motor is positive even number.
Preferably, the third step: the pair of poles (NS) of the first winding group and the pair of poles (NS) of the second winding group are adjacently arranged at intervals in sequence along the tooth space of the stator core, and the axes of the windings of the first winding group and the axes of the corresponding windings of the second winding group are staggered along the circumferential direction of the stator core
Or
The spatial angle of (a). θ is 360 °/(4 mn). The number n of pole pairs of the motor is positive even number.
Preferably, the first winding set and the second winding set are both three-phase windings. n is 2; the first winding group is a three-phase winding divided into an A-a phase, a B-B phase and a C-C phase, and the second winding group is a three-phase winding divided into an X-X phase, a Y-Y phase and a Z-Z phase. Three phases of the first winding group are arranged on six first winding tooth grooves according to the sequence of A, C, B, a, C and B; the three phases of the second winding group are arranged in the order of X, Z, Y, X, Z, Y on the six second winding tooth slots. A. B, C the winding axes of a pair of poles of the three-phase winding and the winding axes of a pair of poles of the X, Y, Z three-phase winding are offset by 180 ° + θ or 180 ° - θ, θ being 360 °/(24).
Preferably, the single-stator single-rotor dual-system low-ripple-torque permanent magnet brushless direct current motor further comprises a central shaft and a base. The central shaft is supported in the machine base. The stator core is fixed on the inner side of the base. The rotor iron core is fixed on the central shaft, and the permanent magnet steel is fixed on the rotor iron core and positioned on the inner side of the stator iron core. The first winding tooth slot and the second winding tooth slot on the stator core are arranged on the inner side of the stator core.
Preferably, the single-stator single-rotor dual-system low-ripple torque permanent magnet brushless direct current motor further comprises a position sensor. The position sensor includes a grating disk, a first set of photosensors, and a second set of photosensors. The grating disk is fixed with the rotating central shaft part. A circle of grating tracks are arranged on the grating disk. The grating track comprises 2n uniform grating lines; the 2n grating lines are respectively aligned with the 2n permanent magnet steel of the rotor core. The m first photoelectric sensors in the first photoelectric sensor group are all fixed on the non-rotating part of the machine base and correspond to the m-phase first winding positions on the first winding group in the stator core. And m second photoelectric sensors in the second photoelectric sensor group are all fixed on the non-rotating part of the machine base and correspond to m second winding positions on the second winding group in the stator core.
Preferably, the rear end of the base is provided with a fan module or an exhaust system. The fan module comprises a fan and a fan cover. The fan cover is fixed with the rear end of the base. The cooling fan is arranged in the fan cover and is fixed with the central shaft. The air exhaust system is arranged on the machine base, and the air exhaust mechanism is used for carrying out air exhaust cooling on the interior of the machine base.
The driving method of the three-phase single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless direct current motor comprises the following specific steps:
TABLE A conducting state sequence table for first winding group permanent magnet brushless DC motor
| Conducting phase | 0-60° | 60-120° | 120-180° | 180-240° | 240-300° | 300-360° |
| Phase A | + | + | - | - | ||
| Phase B | - | + | + | - | ||
| Phase C | - | - | + | + |
In the table, "+" indicates forward conduction and "-" indicates reverse conduction.
TABLE B PERMANENT-MAGNET BRUSHLESS DC MOTOR CONDUCTION STATE SEQUENCE TABLE FOR SECOND WINDING GROUP
| Conducting phase | 0-60° | 60-120° | 120-180° | 180-240° | 240-300° | 300-360° |
| X phase | + | + | - | - | ||
| Phase Y | - | + | + | - | ||
| Phase Z | - | - | + | + |
In the table, "+" indicates forward conduction and "-" indicates reverse conduction.
And under the control of the first rotor position sensor and the first path controller, controlling the first winding group to be switched on and off and the current direction according to the sequence of the table A. And under the control of a second rotor position sensor and a second path of controller, controlling the second winding group to be switched on and off and the current direction according to the sequence of the table B. The three phases of the first winding set and the three phases of the second winding set are switched on and off in the sequence of A-X-B-Y-C-Z (forward rotation) or X-A-Z-C-Y-B (reverse rotation).
The utility model has the beneficial effects that:
1. the utility model provides a single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless direct current motor structure, which changes an original group of m symmetrical windings into two groups of m symmetrical windings with the same parameters and the same power on the basis of the structure of the existing common switched reluctance motor. For the original permanent magnet brushless direct current motor with the same power of the single group of windings, the electric power born by each group of windings after improvement is half of the original electric power, the output power of the motor is unchanged, and the overall structural form and the size of the motor are unchanged.
2. According to the utility model, under the control of the first rotor position sensor and the first path controller, the first winding current and the rotor permanent magnetic field interact to generate a first electromagnetic torque, and the electromagnetic torque contains an average torque and a ripple torque; under the control of a second rotor position sensor and a second path controller, a second winding current interacts with a rotor permanent magnetic field to generate a second electromagnetic torque, and the electromagnetic torque also comprises an average torque and a ripple torque; if the first winding group and the second winding group have the same load factor, the phase difference of two pulsating torques generated by the first winding current and the second winding current respectively acting on the rotor magnetic field is 180 degrees of electrical angle, the amplitudes are close, the cancellation and the inhibition can be effectively realized, and the aim of effectively reducing the pulsating torque is fulfilled.
3. According to the utility model, if the load rates of the first winding group and the second winding group are the same, the average electromagnetic torque component amplitudes of the generated first electromagnetic torque and the second electromagnetic torque are the same, the rotation directions are the same, the first electromagnetic torque and the second electromagnetic torque are mutually overlapped to output the driving load, and the pulsating torque is suppressed by mutual offset of two pulsating torques staggered by 180 degrees of electrical angle, so that the pulsating torque component in the output torque is obviously reduced compared with the existing permanent magnet brushless direct current motor.
4. The utility model adopts two groups of windings to control respectively, the number of unit controllers required to be controlled by the main circuit of the controller is increased, but the capacity requirement on the unit control device is reduced, so that the actually adopted power devices cannot be increased in the situation of adopting small power devices to replace high-power devices in parallel, the capacity requirement on the unit control device is reduced particularly for the control of a high-power switch reluctance motor, the control is convenient, and the cost is reduced.
Drawings
FIG. 1 is a waveform diagram of a ripple torque measured in a conventional permanent magnet brushless DC motor;
FIG. 2 is a schematic structural diagram of a single-stator single-rotor dual-system low-ripple torque permanent magnet brushless DC motor according to the present invention;
FIG. 3 is a schematic view of a combination of a stator core, a first winding set, a second winding set, and a rotor according to the present invention;
FIG. 4 is a schematic diagram of a stator core, a first winding set, a second winding set, and a rotor according to a specific embodiment of the present invention
FIG. 5 is a schematic diagram of a stator core, a first winding set, a second winding set, and a rotor according to a specific embodiment of the present invention
FIG. 6 is a schematic view of a stator core, a first winding set, a second winding set, and a rotor according to the present invention;
FIG. 7 is a schematic diagram of a stator core, a first winding set, a second winding set, and a rotor according to the present invention;
FIG. 8 is a schematic diagram of the present invention for suppressing ripple torque
FIG. 9 is a phase-change current waveform diagram of a three-phase permanent magnet brushless DC motor
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
As shown in fig. 2 and 3, a single-stator single-rotor dual-system low-ripple torque permanent magnet brushless dc motor includes a stator core 1, a first winding group 4, a second winding group 6, a rotor core 2, a permanent magnet steel 5, a central shaft 3, a front end cover 14, a front end cover bearing 7, a base 8, a rear end cover bearing 9, a rear end cover 10, a position sensor 11, a cooling fan 12, a fan cover 13, and a speed regulation control system. The permanent magnet steel 5 is fixed on the rotor core 2, and the front end cover 14 and the rear end cover 10 are respectively fixed with two ends of the machine base 8. The outer rings of the front end cover bearing 7 and the rear end cover bearing 9 are respectively embedded in the middle of the inner side surfaces of the front end cover 14 and the rear end cover 10. The two ends of the central shaft 3 are respectively embedded into the inner rings of a front end cover bearing 7 and a rear end cover bearing 9. The stator core 1 is fixed to the inside of the housing 8. The rotor core 2 is fixed to the center shaft 3 and is positioned inside the stator core 1. The rotor consisting of the rotor iron core and the permanent magnet steel can rotate relative to the stator iron core.
As a specific example, the stator core has four poles of three phases, the stator winding tooth slots have 12 slots, the first winding is a three-phase winding of a phase, B phase, and C phase, and the second winding is a three-phase winding of X phase, Y phase, and Z phase. The first winding group and the second winding group respectively occupy six slots, and three phases of the first winding group are arranged on six first tooth slots according to the sequence of A, C, B, a, C and B; three phases of the second winding group are arranged on six second tooth grooves according to the sequence of X, Z, Y, X, Z and Y; the A-a, B-B and C-C three-phase windings form a pair of poles, and the X-X, Y-Y and Z-Z three-phase windings form a pair of poles. The rotor and the stator have the same pole pair number, and the pole pair number n is 2, so that the three-phase four-pole permanent magnet brushless direct current motor is formed. The winding axes of the first winding group are staggered from the winding axes of the second winding group by an angle of 180 DEG +15 DEG or a spatial angle of 180 DEG-15 deg.
The position sensor 11 is disposed outside the rear cover 10. The position sensor 11 includes a grating disk, a first photosensor group, and a second photosensor group. The grating disk is fixed to the central shaft 3. A circle of grating tracks are arranged on the grating disk. The circle of grating track comprises four grating lines; the four grating lines are respectively aligned with the four-pole magnetic steel of the rotor core. Three first photoelectric sensors in the first photoelectric sensor group are respectively aligned with the three-phase winding corresponding positions of the first winding group in the stator core 1. Three second photoelectric sensors in the second photoelectric sensor group are respectively aligned with the three-phase winding corresponding positions of the second winding group in the stator core 1. Each photosensor is fixed to the rear end cap 10 and faces the grating track on the grating disk. Each photoelectric sensor of the position sensor 11 outputs a position signal between the rotor magnetic steel and the first winding and between the rotor magnetic steel and the second winding, respectively.
The two paths of position output signals are connected with two paths of motor drivers in the speed regulation control system. The speed regulation control system respectively controls the power on and power off and the current direction of the first winding group and the second winding group according to signals output by the first photoelectric sensor group and the second photoelectric sensor group, so that the speed regulation control and the suppression of the pulsating torque of the permanent magnet brushless direct current motor are realized. The fan cover 13 is fixed to the rear end of the base 8. The cooling fan 12 is disposed in the fan cover 13 and fixed to the center shaft. The three-phase winding interface of the first winding group 4 is connected with a motor control interface of a first path of motor driver in the speed regulation control system; and the three-phase winding interface of the second winding group 6 is connected with the motor control interface of a second path of motor driver in the speed regulation control system.
The preparation process of the low-pulsation-torque permanent magnet brushless direct current motor is as follows:
firstly, a stator iron core 1, a first winding group 4, a second winding group 6, a rotor iron core 2, permanent magnet steel 5, a central shaft 3, a front end cover 14, a front end cover bearing 7, a machine base 8, a rear end cover bearing 9, a rear end cover 10, a position sensor 11, a cooling fan 12 and a fan cover 13 are respectively processed.
Then, mounting and assembling are carried out, specifically as follows: respectively installing a first winding group 4 and a second winding group 6 in winding slots of a stator core 1, fixedly installing a stator provided with windings in a machine base 8, and leading out lead-out wires of the two groups of windings out of the machine base; the rotor core 2 is fixedly arranged on a central shaft 3; fixing the permanent magnet steel 5 on the rotor core 2; the front end cover bearing 7 and the rear end cover bearing 9 are respectively embedded into the front end cover 14 and the rear end cover 10. Inserting the central shaft 3 into the front end cover bearing 7 and the rear end cover bearing 9; a rotor consisting of a rotor iron core and permanent magnet steel is placed in the stator iron core. Fixing the front end cover 14 and the rear end cover 10 with the base, wherein the rotor can rotate relative to the stator after the fixing; fixing a sensing part (a grating disc) of a position sensor 11 with a central shaft, fixing a signal receiving part (a photoelectric sensor) of the position sensor with a rear end cover 10, and leading out a position signal wire; the cooling fan 12 is fixed to the center shaft. Finally, a fan cover 13 covers the cooling fan 12 and is fixed to the rear end of the base 8. At this point, the motor installation is completed. And then the motor is connected with a control system for power supply, and the permanent magnet brushless direct current motor with low pulse torque can operate.
The driving method of the low-pulsation-torque permanent magnet brushless direct current motor comprises the following specific steps:
under the control of the first rotor position sensor and the first path controller, the first winding 4 is controlled to control the on-off and current direction of the A-B-C three-phase winding according to the sequence of the table A. And under the control of a second rotor position sensor and a second path of controller, the second winding 6 is controlled to control the on-off of the X-Y-Z three-phase winding to have the current direction according to the sequence of the table B.
In the control process, the winding current corresponding to the first winding group 4 interacts with the magnetic field of the permanent magnet steel to generate a first electromagnetic torque, and the winding current corresponding to the second winding group 6 interacts with the magnetic field of the permanent magnet steel to generate a second electromagnetic torque. If two motor systems formed by two groups of winding groups controlled by the control system have the same load rate, the pulsating torque components in the two generated electromagnetic torques have the same frequency, the same amplitude and 180-degree electrical angle difference of phases, so that mutual cancellation and inhibition are realized; two average torque directions of the two generated electromagnetic torques are the same, the two average torque directions are overlapped to form an output torque driving load, and the pulsating torque is restrained, so that the pulsating torque component in the output torque is obviously reduced.
The specific principle of the utility model for inhibiting the pulsating torque is as follows:
for the three-phase four-pole double-system permanent magnet brushless DC motor shown in the special example. The tooth grooves of the first winding group, the tooth grooves of the second winding group and the rotor magnetic steel respectively form two three-phase four-pole motor systems; one of the poles is invisible, the distance of rotating one pair of poles for each motor system rotor needs to be phase-changed for six times, the phase-change is performed for 12 times in one rotation, and the axes of the two winding systems are staggered by 180 degrees +15 degrees space angles, so that 12 × 15 degrees-180 degrees electrical angle staggering is performed for two pulsating torques. Therefore, the two ripple torques generated by the first winding group 4 and the second winding group 6 are mutually suppressed after being superposed according to the peak-valley complementary principle shown in fig. 8, and the effect of effectively reducing the ripple torque is achieved.
Example 2
As shown in fig. 3, the present embodiment is different from embodiment 1 in that: the first winding groups are uniformly distributed and arranged along the inner side of the stator and account for 1/2 stator tooth slots, the number of pole pairs formed by the windings is the same as that of the rotor, the second winding groups are also uniformly distributed and arranged along the inner side of the stator, the electromagnetic parameters of the first winding groups and the second winding groups are the same, the two winding groups respectively account for 1/2 stator tooth slots, the winding slots corresponding to the first winding groups and the second winding groups and the winding axes of the second winding groups are staggered from the corresponding winding axes of the first winding groups by a certain angle theta, and the theta is 360 degrees/4 mn.
Example 3
As shown in fig. 7, the present embodiment is different from embodiment 1 in that: the NS pair of poles of the first winding group and the NS pair of poles of the second winding group are arranged along the winding tooth slot of the stator core at intervals,the corresponding winding axes in the first winding group and the corresponding winding axes in the second winding group are staggered along the circumferential direction of the stator core
Or
The spatial angle of (a). θ is 360 °/(4 mn).
As shown in fig. 4 and 6, the first winding group and the second winding group occupy 1/2 sections in each tooth slot on the inner side of the stator core, are uniformly arranged in each section slot to form m symmetrical windings, and the axes of the windings of the first winding group and the axes of the corresponding windings of the second winding group are staggered by a space angle of 180 ° + θ or 180 ° - θ along the circumferential direction of the stator core. θ is 360 °/(4 mn). The number n of pole pairs of the motor is positive even number.
As shown in fig. 5, the first winding group and the second winding group are both three-phase windings. n is 2; the first winding group is a three-phase winding divided into an A-a phase, a B-B phase and a C-C phase, and the second winding group is a three-phase winding divided into an X-X phase, a Y-Y phase and a Z-Z phase. Three phases of the first winding group are arranged on six first winding tooth grooves according to the sequence of A, C, B, a, C and B; the three phases of the second winding group are arranged in the order of X, Z, Y, X, Z, Y on the six second winding tooth slots. A. B, C the winding axes of a pair of poles of the three-phase winding and the winding axes of a pair of poles of the X, Y, Z three-phase winding are offset by 180 ° + θ or 180 ° - θ, where θ is 360 °/(12 n).
In the figure, T is the polar distance of a pair of poles.
Claims (6)
1. Single stator list rotor dual system hangs down ripple torque permanent-magnet brushless motor, its characterized in that: the permanent magnet motor comprises a stator iron core (1), a rotor iron core (2), a central shaft (3), a first winding group (4), permanent magnet steel (5), a second winding group (6), a front end cover bearing (7), a machine base (8), a rear end cover bearing (9), a rear end cover (10) and a front end cover (14); the permanent magnet steel (5) is fixed on the rotor core (2), and the front end cover (14) and the rear end cover (10) are respectively fixed with the two ends of the base (8); the outer rings of the front end cover bearing (7) and the rear end cover bearing (9) are respectively embedded in the middle of the inner side surfaces of the front end cover (14) and the rear end cover (10); the two ends of the central shaft (3) are respectively embedded into the inner rings of the front end cover bearing (7) and the rear end cover bearing (9); the stator iron core (1) is fixed on the inner side of the base (8); the rotor iron core (2) is fixed on the central shaft (3), and a rotor consisting of the permanent magnetic steel and the rotor iron core is positioned on the inner side of the stator iron core (1); can rotate relative to the stator core; the rear end of the base is provided with a fan module or an exhaust system; the fan module comprises a fan (12) and a fan cover (13); the fan cover is fixed with the rear end of the base; the cooling fan is arranged in the fan cover and is fixed with the central shaft; the air exhaust system is arranged on the base, and the air exhaust mechanism is used for carrying out air exhaust cooling on the inside of the base;
the number n of magnetic pole pairs formed by permanent magnetic steel on the rotor iron core (2) is the same as the number n of magnetic pole pairs formed by the stator winding, and the pole pitch O is the same; the first winding group and the second winding group have the same electromagnetic parameters, namely, the first winding group and the second winding group have the same pitch, the same arrangement rule, the same phase number, the same winding turns and the same winding wire diameter, the winding phase number m > is 3, the first winding group (4) and the second winding group (6) are arranged on the inner side of a stator core, a first winding current and a second winding current respectively act on a rotor magnetic field to generate two electromagnetic torques, the phase of pulsating torque components in the two electromagnetic torques is different by 180 degrees of electric angle, mutual suppression is realized, the average torque components in the two electromagnetic torques have the same direction, and a driving load is superposed and output.
2. The single stator single rotor dual system low ripple torque permanent magnet brushless motor of claim 1, wherein: the first winding group and the second winding group occupy the same number of tooth gaps on the inner side of the stator core, the first winding group is uniformly arranged along the tooth gaps of the windings on the inner side of the stator core to form m symmetrical windings, the windings form n pairs of poles, the second winding group is also uniformly arranged along the tooth gaps of the windings on the inner side of the stator core to form m symmetrical windings, and the windings form n pairs of poles; the winding axis of the second winding group and the winding axis corresponding to the first winding group are mutually staggered by a space angle theta, theta is 360 DEG/4 mn, and the pole pair number of the motor is n > which is a natural number of 1.
3. The single stator single rotor dual system low ripple torque permanent magnet brushless motor of claim 1, wherein: the first winding group and the second winding group respectively occupy 1/2 sections in winding tooth grooves on the inner side of the stator core, and are uniformly arranged in respective section winding tooth grooves to form m symmetrical windings, and the axis of the winding of the first winding group and the axis of the corresponding winding of the second winding group are staggered by a space angle of 180 degrees + theta or 180 degrees-theta along the circumferential direction of the stator core; and theta is 360 DEG/4 mn, and the number n of pole pairs of the motor is positive and even.
4. The single stator single rotor dual system low ripple torque permanent magnet brushless motor of claim 1, wherein: the pair of poles of the first winding group and the pair of poles of the second winding group are adjacently arranged at intervals in sequence along the winding tooth space of the stator core, and the axes of the windings of the first winding group and the axes of the corresponding windings of the second winding group are staggered along the circumferential direction of the stator core
Or
The spatial angle of (a); and theta is 360 DEG/4 mn, and the number n of pole pairs of the motor is positive and even.
5. The single stator single rotor dual system low ripple torque permanent magnet brushless motor of claim 1, wherein: further comprising a rotor position sensor (11); the rotor position sensor comprises a grating disk, a first photoelectric sensor group and a second photoelectric sensor group; the grating disc is fixed with the rotating central shaft part; a circle of grating tracks are arranged on the grating disk; the grating track comprises 2n uniform grating lines; the 2n grating lines are respectively aligned with the 2n permanent magnet steel of the rotor core; m first photoelectric sensors in the first photoelectric sensor group are all fixed on the non-rotating part of the machine base and correspond to m-phase first winding positions on the first winding group in the stator core; m second photoelectric sensors in the second photoelectric sensor group are all fixed on the non-rotating part of the machine base and correspond to m second winding positions on the second winding group in the stator core; and the output rotor position signals of the first photoelectric sensor group and the second photoelectric sensor group are sent to a control system so as to control the on-off and current direction of each phase winding of the first winding group and the second winding group.
6. The single stator single rotor dual system low ripple torque permanent magnet brushless motor of claim 3, wherein: the first winding group and the second winding group are three-phase windings; the number of pole pairs n is 2; the first winding component is a three-phase winding of an A-a phase, a B-B phase and a C-C phase, and the second winding component is a three-phase winding of an X-X phase, a Y-Y phase and a Z-Z phase; three-phase windings of the first winding group are arranged on six first winding tooth grooves according to the sequence of A, C, B, a, C and B; three-phase windings of the second winding group are arranged on six second winding tooth grooves according to the sequence of X, Z, Y, X, Z and Y; A. b, C the winding axes of a pair of poles of the three-phase winding and the winding axes of a pair of poles of the X, Y, Z three-phase winding are offset from each other by 180 ° + θ or 180 ° - θ, where θ is 360 °/(12 n).
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| CN202120044126.4U CN215733977U (en) | 2021-01-08 | 2021-01-08 | Single Stator Single Rotor Dual System Low Pulsating Torque Permanent Magnet Brushless Motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787477A (en) * | 2021-01-08 | 2021-05-11 | 杭州电子科技大学 | Single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless motor and driving method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787477A (en) * | 2021-01-08 | 2021-05-11 | 杭州电子科技大学 | Single-stator single-rotor dual-system low-pulsation-torque permanent magnet brushless motor and driving method |
| CN112787477B (en) * | 2021-01-08 | 2024-06-04 | 杭州电子科技大学 | Single-stator single-rotor double-system low-pulsation torque permanent magnet brushless motor and driving method |
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