CN109873542B - Single-phase motor - Google Patents
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- CN109873542B CN109873542B CN201811203190.1A CN201811203190A CN109873542B CN 109873542 B CN109873542 B CN 109873542B CN 201811203190 A CN201811203190 A CN 201811203190A CN 109873542 B CN109873542 B CN 109873542B
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Abstract
The invention provides a single-phase motor which can improve the output of the motor during high-speed rotation, restrain torque pulsation and ensure starting performance in a mode of not generating a condition that the torque is 0 during driving. The single-phase motor is provided with: a rotor (1) having permanent magnets; and a stator (3) comprising a stator core (30) disposed on the outer periphery of the rotor (1) with a gap therebetween, the stator core having a pair of teeth (33) facing the rotor (1), and a coil (34) provided around the teeth, wherein the tooth angle, which is the mechanical angle of an angle region of the tip of the teeth (33) facing the outer periphery of the rotor, is 40 ° or more and 120 ° or less, the position of the teeth in the circumferential direction, which is set according to the rotor phase when the counter-induced voltage is 0, is used as a reference position, and the angle ratio R ([ theta ] 1/theta) between the travel-side angle [ theta ] 1 and the tooth angle [ theta ] obtained by dividing the angle region into two reference positions is 0.51 or more.
Description
Technical Field
The present invention relates to a single-phase motor using a permanent magnet rotor.
Background
In a single-phase motor using a permanent magnet rotor, a pair of tooth portions are arranged to face each other with the rotor interposed therebetween. Such a single-phase motor can be simply configured including a drive circuit and is relatively inexpensive, but there is a problem in starting performance in principle. Therefore, a technique for improving startability has been developed. For example, patent document 1 and the like disclose the following techniques: the surface of the tooth portion facing the rotor is made eccentric, or a recess is provided in the tooth portion, thereby improving the starting performance.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3462043
Disclosure of Invention
Problems to be solved by the invention
However, in the single-phase motor described above, if the angle of the tooth portion facing the outer periphery of the rotor (tooth tip angle, hereinafter referred to as tooth angle) is increased to increase the interlinkage magnetic flux with the permanent magnet rotor, the efficiency of the motor output with respect to the amount of current can be improved. However, the inductance is increased by enlarging the tooth angle, and therefore the following problems occur: the output of the motor is significantly reduced at high-speed rotation.
On the other hand, if the tooth angle is reduced, contrary to the above, the motor output is reduced when the motor is rotated at high speed, but the efficiency of the motor is reduced because the interlinkage magnetic flux with the permanent magnet rotor is reduced, and in addition, the following problems occur: the torque ripple, which is a factor of vibration of the motor during driving (during energization), increases. Further, if the torque ripple increases, the startability may be deteriorated in the case of a single-phase motor.
Although patent document 1 focuses on startability, it does not focus on reduction in motor output and torque ripple at the time of high-speed rotation.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a single-phase motor capable of improving the output of the motor at the time of high-speed rotation, suppressing torque ripple, and ensuring startability so as not to cause a situation (dead point) in which the torque is 0 at the time of driving.
Means for solving the problems
(1) The single-phase motor of the present invention comprises a rotor and a stator, wherein the rotor is provided with a permanent magnet, the stator is composed of a stator core and a coil, the stator core is disposed on the outer periphery of the rotor via a gap and has a pair of teeth portions having a tip end wall portion, the coils are provided around the teeth, and the single-phase motor is characterized in that a tooth angle θ, which is a mechanical angle of an angular region of the tip end wall portion of the teeth along the circumferential direction of the outer periphery of the rotor, is 40 ° or more and 120 ° or less, and a position of the teeth in the circumferential direction set according to the phase of the rotor when a counter-induced voltage is 0 is set as a reference position, and an angle ratio R (θ 1/θ) between a traveling-side angle θ 1, which is an angle on the side of the rotational traveling direction of the rotor obtained by dividing the angular region into two at the reference position, and the tooth angle θ is 0.51 or more.
(2) Preferably, the tooth angle is 80 ° or more, and the angle ratio R is 0.65 or less.
(3) Preferably, the stator core includes a yoke portion surrounding an outer periphery of the rotor, and a pair of tooth forming portions of the yoke portion provided across the rotor, the tooth portions protruding from the tooth forming portions toward the rotor, respectively, and the yoke portion forming an open magnetic circuit.
(4) Preferably, the yoke portion includes: a pair of opposed side portions each having the tooth forming portion; and a connecting side portion connecting the pair of opposing side portions, wherein the yoke portion is formed in a shape of "コ" when viewed in an axial direction of the rotor.
(5) Preferably, the stator core includes: a yoke portion surrounding an outer periphery of the rotor; and a pair of tooth forming portions of the yoke portion provided across the rotor, the tooth portions protruding from the tooth forming portions toward the rotor, respectively, and the yoke portion forming a closed magnetic path.
(6) Preferably, the yoke portion is formed in a rectangular shape including a pair of long side portions and a pair of short side portions when viewed in an axial direction of the rotor, and the tooth portion is formed on each of the long side portions.
(7) Preferably, the tip end wall portion of each of the teeth is formed in an arc shape along the outer periphery of the rotor, and the amount of projection of the tip end wall portion from the tooth forming portion is set to be different between one edge side and the other edge side of the tip end wall portion.
(8) Preferably, the winding wire wound around the teeth is disposed at a position separated from a peripheral wall surface of the teeth.
(9) Preferably, the single-phase motor is connected to an ac power supply for setting the motor rotation speed to 70000rpm or more.
The effects of the invention are as follows.
According to the present invention, the output of the motor can be improved during high-speed rotation. Further, by setting the angle ratio R of the tooth angle θ to the traveling-side angle θ 1, the tooth portion can be made sufficiently asymmetric with respect to the reference position, and startability can be ensured. In addition, torque ripple can be reduced when the motor is driven, and a situation in which the torque is 0 during driving can be avoided.
Drawings
Fig. 1 is a configuration diagram showing a main part of a single-phase motor according to an embodiment when viewed from an axial direction.
Fig. 2 is a graph illustrating a reference position where the back-induced electromotive force is 0.
Fig. 3 is a graph showing characteristics of magnetic flux passing through the stator core and inductance of the stator coil when the tooth angle is changed.
Fig. 4 is a graph showing characteristics of torque of the motor with respect to the rotation speed of the motor at a tooth angle θ.
Fig. 5 is a graph showing characteristics of torque ripple of the motor with respect to the traveling-side angle θ 1 for each tooth angle θ.
Fig. 6 is a graph showing characteristics of torque ripple of the motor with respect to the angle ratio R at a tooth angle θ.
Fig. 7 is a graph showing a slip angle (a slip angle of a phase where an induced voltage of a rotor is 0 and a phase where a cogging torque is 0) with respect to an angle ratio R for each tooth angle θ.
Fig. 8 is a configuration diagram showing an example of a single-phase motor in the case where the angle ratio R is larger than 0.65.
Fig. 9 is a graph showing changes in output and slip angle when the output is the maximum angle ratio R among the tooth angles θ.
Fig. 10 is a structural view showing an example in which the present invention is applied to a closed magnetic circuit motor.
Description of the symbols
1-single phase motor, 2-rotor, 3-stator, 21-N pole of permanent magnet, 22-S pole of permanent magnet, 30-stator core, 31 ' -yoke, 31 a-opposed side, 31 b-connecting side, 31a ' -long side, 31b ' -short side, 32-tooth forming portion, 33-tooth portion, 33 a-front end wall, 33b, 33 c-side wall (viewed axially), 33d, 33 e-corner, 34 ' -coil, 34a ' -winding, 35-corner space, O1-a centre of rotation.
Detailed Description
Hereinafter, a single-phase motor according to an embodiment will be described with reference to the drawings. The embodiments described below are merely examples, and are not intended to exclude the application of various modifications and techniques not explicitly described in the embodiments below. The respective configurations of the present embodiment can be variously modified and implemented without departing from the gist thereof. Further, they may be selected as needed, or may be appropriately combined.
(Structure)
As shown in fig. 1, the single-phase motor (hereinafter, also simply referred to as a motor) 1 is an inner-rotor type two-pole two-slot brushless motor having a rotor 2 disposed inside and a stator 3 disposed outside.
The rotor 2 has a permanent magnet, and N poles 21 and S poles 22 are arranged on the outer periphery of the rotor 2 with a phase shift of 180 degrees. The rotor 2 rotates around a rotation center O1And (4) rotating.
The stator 3 includes a stator core 30 formed by laminating a plurality of thin plates (e.g., silicon steel plates), and a coil 34 provided on the stator core 30 via an insulator (not shown), and the stator core 30 is disposed on the outer periphery of the rotor 2 with a gap therebetween.
The stator core 30 further includes: a yoke portion 31 surrounding one side of the rotor 2; and a pair of tooth portions 33, the pair of tooth portions 33 protruding toward the rotor 2 from a pair of tooth forming portions 32, 32 located on the yoke portion 31 across the rotor 2. The tip end portions of the pair of tooth portions 33 are formed with respect to the rotation center O when viewed from the axial direction1Point symmetry.
The yoke 31 is formed in a shape of "コ" (channel iron shape) when viewed from the axial direction, and includes: a pair of opposed sides 31a, 31a each having a tooth forming portion 32; and a connecting side 31b connecting the opposing ends of the opposing sides 31a, 31 a. The opposing sides 31a, 31a have their other ends facing each other open.
The tip end wall portion 33a of each tooth portion 33 formed at the tip end in the protruding direction is formed in an arc shape as viewed from the axial direction along the outer peripheral surface 2a of the rotor 2. The side wall portions 33b and 33c located on both sides of each tooth portion 33 as viewed in the axial direction may not be parallel to the connecting side portion 31b, and the side wall portions 33b and 33c may be inclined so as to be apart from each other toward the distal end.
The corner 33d on one edge side (the side in the rotational traveling direction of the rotor 2) and the corner 33e on the other edge side (the opposite side in the rotational traveling direction of the rotor 2) of the distal end wall portion 33a are set to protrude by different amounts toward the opposing teeth 33. Here, one edge side corner 33d of the leading end wall 33a protrudes more greatly than the other edge side corner 33 e. The direction of the rotational travel of the rotor 2 refers to a direction in which the outer periphery of the rotor 2 travels when the rotor 2 rotates.
Further, a side wall portion 33b of the tooth portion 33 on one edge side (the side in the rotational traveling direction of the rotor 2) forming the one edge side corner portion 33d is slightly inclined so as to be close to parallel to the short side portion 31b, whereas a side wall portion 33c on the other edge side (the side opposite to the rotational traveling direction of the rotor 2) forming the other edge side corner portion 33e is inclined more largely than the side wall portion 33 b. Therefore, the side wall portion 33c side of the tooth portion 33 is narrowed.
The pair of tooth portions 33 is formed to be opposed to the rotation center O when viewed from the axial direction1Point symmetry.
The one-edge-side corner 33d of one tooth 33 and the other-edge-side corner 33e of the other tooth 33 are separated from each other, and the tooth 33 is not disposed in the region between the one-edge-side corner 33d and the other-edge-side corner 33e in the outer circumferential surface 2a of the rotor 2, and the outer circumferential surface 2a is exposed to the yoke 31.
A coil 34 is provided around the connecting side portion 31b of the yoke portion 31, and the coil 34 is formed by winding a wire 34a having an insulating coating on the outer peripheral surface, the core wire being made of copper, for example. The coil 34 is connected to an ac power supply, and alternately generates magnetic flux from one tooth 33 toward the other tooth 33 or from the other tooth 33 toward the one tooth 33 according to an ac frequency.
When an alternating current is supplied to the coil 34, the yoke 31 forms a magnetic path (magnetic circuit), and the rotor 2 rotates as indicated by an arrow in fig. 1 due to interaction with magnetic flux of the permanent magnet of the rotor 2. The magnetic flux passing through the yoke 31 and the teeth 33 flows to the rotation center O via the rotor 21The opposite side tooth portion 33. The opposed other ends of the pair of opposed sides 31a, 31a are open, and therefore the magnetic circuit is an open-loop magnetic circuit.
However, in the present motor 1, the tooth angle θ of the leading end wall portion 33a of the tooth portion 33 is set within a predetermined range. The tooth angle θ is a mechanical angle in the circumferential direction of a portion of the outer periphery 2a of the rotor 2 facing the front end wall portion 33 a. The predetermined range of the tooth angle θ means a range of 40 ° or more and 120 ° or less (40 ° ≦ θ ≦ 120 °), and in the present embodiment, the tooth angle θ is 110 °.
In the motor 1, the traveling-side angle θ 1 is an angle on the side of the reference position of the tooth 33 on the side of the rotational traveling direction of the rotor 2 from the reference position when the tooth angle θ bisects the reference position (mechanical angular position), and an angular ratio R (θ 1/θ) between the traveling-side angle θ 1 and the tooth angle θ is set within a predetermined range.
The reference position of the tooth 33 is a circumferential position of the tip wall portion 33a of the tooth 33 corresponding to the rotational phase of the rotor 2 when the counter electromotive force of the rotor 2 is 0.
When the rotor 2 in a stopped state is rotated, a counter electromotive force is generated according to a positional relationship between the magnetic poles of the permanent magnets of the rotor 2 and the respective teeth 33, that is, a mechanical angle of the motor 1. As shown in fig. 2, a voltage (counter-induced voltage) generated by the counter electromotive force at this time changes in a sin wave shape according to the mechanical angle of the motor 1, and there is a mechanical angle (zero crossing) at which the counter-induced electromotive force is 0. The circumferential position of the tip wall portion 33a of the tooth portion 33 corresponding to the inter-magnetic-pole position (intermediate position between the S pole and the N pole) 2S of the rotor 2 when the counter induction voltage is 0 is set as the reference position of the tooth portion 33.
The predetermined range of the travel-side angle θ 1 is 48 ° or more and 63 ° or less, and in the present embodiment, as shown in fig. 1, the tooth angle θ is 110 °, and the travel-side angle θ 1 on the rotational travel direction side of the rotor 2, which is obtained by dividing the tooth angle θ (110 °) at the reference position, is 58 °. Therefore, the angle ratio R (═ θ 1/θ) is 58/110 ≈ 0.53.
In this way, the tooth angle θ and the traveling-side angle θ 1 are set within the predetermined ranges for the following respective purposes: the object of suppressing the increase of the inductance of the stator 3 and suppressing the output reduction of the motor 1 at the time of high-speed rotation; and a phase of the driving torque generated by the energization is made different from a phase of the cogging torque, and the torque ripple is suppressed to ensure good startability.
Fig. 3 to 5 are graphs showing characteristics of the motor 1 with respect to the tooth angle θ.
As shown in fig. 3, the motor 1 has a characteristic that the larger the tooth angle θ, the more the magnetic flux passes through the stator core 30. Generally, the output of the motor is increased by increasing the magnetic flux.
On the other hand, the larger the tooth angle θ, the larger the inductance of the motor 1.
When the motor 1 rotates at a high speed, the tooth angle θ is large, and is affected by a high inductance, and the input of current is greatly reduced, so that as shown in fig. 4, the tooth angle θ is small at the time of high-speed rotation, and sometimes becomes high torque.
Further, since the output of the motor has a proportional relationship with the torque, the output of the motor becomes smaller when the tooth angle θ is large when the motor rotates at a high speed. For example, at 60000rpm, the torque of the tooth angle of 135 ° or more is lower than the torque of the tooth angle of 120 ° or less, and therefore, when the motor 1 is a high-speed rotary motor, the tooth angle of 120 ° or less is preferable.
Further, although the torque of the motor 1 increases as the tooth angle θ increases when the rotation speed of the motor 1 is low, the torque of the motor 1 decreases as the tooth angle θ increases in a region where the rotation speed of the motor 1 is higher than 70000 rpm. In particular, this characteristic is remarkably exhibited at 80000rpm or more.
Fig. 5 is a graph showing characteristics of torque fluctuation (torque ripple) of the motor 1 with respect to the traveling-side angle θ 1, which is generated when the motor 1 is operated (driven). As shown in fig. 5, the motor 1 has a characteristic that the torque ripple is reduced as the tooth angle θ is increased at the time of high-speed rotation.
On the other hand, when the tooth angle θ is small, the torque variation becomes large because the magnetic flux density change of the gap between the tooth portion 33 and the rotor 2 at the time of high-speed rotation becomes rapid, but the torque variation tends to decrease by increasing the traveling-side angle θ 1. When the traveling-side angle θ 1 is set to 55 ° or more, the torque variation of the motor 1 can be stably reduced. Therefore, it is also preferable to set the value of the traveling-side angle θ 1 to such a magnitude.
Fig. 6 is a graph showing output characteristics at high-speed rotation of the motor 1 at a travel-side angle θ 1 (here, the first rotation speed N1, N1 is 100000rpm) in relation to an angle ratio R of the travel-side angle θ 1 to the tooth angle θ.
As shown in fig. 6, when the angular ratio R is 0.50 (the tooth shape symmetrical with respect to the reference position) at the time of high-speed rotation, the output is rapidly increased by increasing the angular ratio R from 0.50 to 0.55. Each tooth angle saturates the rise in output between 0.55 and 0.80 of the angle ratio R and then slowly decreases. That is, in order to obtain a high output, it is preferable to set the angle ratio R between 0.55 and 0.80.
Fig. 7 is a graph showing characteristics of a torque slip angle of the motor with respect to an angle ratio R for each tooth angle. The torque slip angle of the motor is a deviation of a phase of the rotor 2 where the induced electromotive force is 0 from a phase of the cogging torque where 0 is present, and the larger the torque slip angle is, the better the starting performance is. When the angle ratio R is 0.5, the tooth portion 33 is symmetrical in the left-right direction (symmetrical in the upstream and downstream directions in the rotational direction), and the tip wall portion 33a is asymmetrical in the left-right direction (asymmetrical in the upstream and downstream directions in the rotational direction). In fig. 7, the case where the phase of the cogging torque 0 is shifted to the rotation direction side from the phase of the induced voltage 0 is shown as positive.
As shown in fig. 7, when the angle ratio R is obtained to be large, that is, the traveling-side angle θ 1 is obtained to be large, the torque deviation angle becomes large, and the startability is improved. As a result of intensive studies, it is found that the torque deviation angle is preferably 1.5 ° or more in order to obtain good startability, and the angle ratio R in this case may be 0.51 or more. More preferably, the torque slip angle is 2.0 ° or more, and the angle ratio R in this case is 0.51 or more and the tooth angle θ is 60 ° or more.
In order to make the angle ratio R more than 0.65 and to make the stator 3 small, for example, it is conceivable to shorten the teeth 33 as shown in fig. 8, but in this configuration, portions other than the teeth 33 may come close to the rotor 2. In the case of the configuration shown in fig. 8, the gap between the rotor 2 and the tooth 33 at the B position outside the tooth 33 is narrower than the a position serving as the tooth 33, and unexpected short-circuiting of magnetic flux may occur, which may degrade the characteristics of the motor. Therefore, when the motor is downsized, the angle ratio R is more preferably 0.65 or less.
Fig. 9 shows a change in the output of the motor 1 and a change in the torque slip angle when the output of the motor 1 has the largest angle ratio R among the respective tooth angles θ. In the range of the tooth angle θ of 40 ° to 120 °, good output can be obtained. In addition, particularly good output can be obtained in the range of 80 ° or more and 100 ° or less.
(action and Effect)
The single-phase motor 1 of the present embodiment is configured as described above, and by setting the tooth angle θ to 40 ° or more and 120 ° or less, the output of the motor during high-speed rotation can be improved. Further, if the tooth angle θ is large, it is difficult to ensure the angle ratio R, but if the tooth angle θ is 120 ° or less, it is easy to ensure the angle ratio R.
Further, since the angle ratio R is 0.51 or more, the teeth 33 can be made sufficiently asymmetric in the left-right direction, and the torque deviation angle can be increased, thereby ensuring startability.
Further, by setting the tooth angle θ to 80 ° or more and setting the angle ratio R to 0.65 or less, the machining of the tooth portion 33 becomes easy.
Since the yoke portion 31 forms an open magnetic circuit, the motor 1 can be compactly configured, and it is also suitable for centering the rotation center O of the motor 11And a corner portion disposed in the housing.
Since the yoke 31 is formed in the shape of "コ", there is an advantage that the space inside the housing can be efficiently used even if the housing, not shown, of the motor 1 is formed in a rectangular parallelepiped shape having good assemblability with respect to the respective devices.
In the present embodiment, the rotation center is set to be opposite to the rotation center O1Since the tip end wall portions 33a of the pair of teeth 33 that are point-symmetrical have different projection amounts on one edge side and the other edge side, the magnetic paths in the teeth 33 are formed so as to be asymmetrical on the left and right sides on the one edge side and the other edge side. Therefore, the direction of the magnetic path is deviated from the reference line direction (the direction along the direction in which the short side portion 31b extends) of the pair of tooth forming portions 32 and 32 of the coupling yoke 31, and the phase at which the torque of the motor is 0 and the phase at which the counter-induced voltage is 0 are easily shifted, so that there is also an advantage that the startability of the motor 1 from the stop can be easily ensured.
If the tooth angle θ is made small, the magnetic flux of the motor 1 passing through the stator core 30 is reduced, and the output of the motor 1 is reduced in this regard, but if the motor 1 is configured to be connected to an ac power supply having a motor rotation speed of 70000rpm or more, more preferably 80000rpm or more, and the motor 1 is rotated at a high speed, the output of the motor 1 can be ensured even if the tooth angle θ is set to be small, such as 120 ° or less, and further 100 ° or less.
[ other means ]
In the above-described embodiment, an open-magnetic-circuit motor is exemplified, but the present invention can be applied to a closed-magnetic-circuit motor shown in fig. 10, for example.
In fig. 10, the same reference numerals as in fig. 1 denote the same components, and the description thereof will be omitted. As shown in fig. 10, the stator core 30 is formed to be opposed to the rotation center O when viewed from the axial direction1Point symmetry. The yoke portion 31 ' surrounding the outer periphery of the rotor 2 is formed in a rectangular ring shape when viewed from the axial direction, and includes long side portions 31a ', 31a ' corresponding to the respective long sides of the rectangle and extending with a constant width, and short side portions 31b ', 31b ' corresponding to the respective short sides of the rectangle and extending with a constant width, and tooth forming portions 32, 32 are provided on the respective long side portions 31a ', 31a '.
A coil 34 'formed by winding a copper wire 34 a' is provided around each tooth 33. Each coil 34' is connected to an ac power supply, and alternately generates magnetic flux from one tooth 33 toward the other tooth 33 or from the other tooth 33 toward the one tooth 33 according to an ac frequency. In this configuration, the winding 34 a' is disposed at a position separated from the base portions of the peripheral wall portions (particularly, the side wall portions) 33b and 33c of the tooth portion 33.
In this case, the yoke 31 forms a closed magnetic path, and thus can be configured compactly. Therefore, the following advantages are provided: the motor 1 can be easily rotated at high speed, and the output power and efficiency can be increased, and the generation of vibration during the rotation of the motor 1 can be suppressed.
Since the yoke 31 is formed in a rectangular shape, even if a casing, not shown, of the motor 1 is formed in a rectangular parallelepiped shape having good assemblability with respect to each device, there is an advantage that a space in the casing can be efficiently used.
Even if the magnetic flux flows through the corner space 35 of the narrowed portion of the base portion (side wall portion 33c) of the side wall portions 33b, 33c located inside the winding 34a ', the magnetic flux is output to be interlinked with the winding 34a ', contributing to a reduction in the amount of the winding 34a ' (reduction in the weight increase of the motor 1) and an improvement in the output of the motor 1.
The yoke 31 shown in fig. 1 has a shape of "コ" when viewed from the axial direction, but when the magnetic circuit is formed by an open-loop magnetic circuit, the shape of the yoke 31 when viewed from the axial direction is not limited to this, and various shapes such as a U-shape and a C-shape having a curved portion can be formed.
In the case where the magnetic circuit is constituted by a closed magnetic circuit, the yoke portion 31 'shown in fig. 10 has a rectangular or substantially quadrangular shape when viewed from the axial direction, but the shape of the yoke portion 31' when viewed from the axial direction is not limited thereto, and various shapes such as a circular or substantially circular shape, an N-sided shape (N is an even number), and the like can be formed.
The shape of the teeth 33 and the arrangement of the windings 34a and 34 a' are not limited to those in the embodiment, and can be changed as appropriate.
Claims (9)
1. A single-phase motor includes a rotor having a permanent magnet, and a stator including a stator core and a coil, the stator core being disposed on an outer periphery of the rotor via a gap and including a pair of teeth having a tip wall portion, the coil being provided around the teeth,
the above-mentioned single-phase motor is characterized in that,
a tooth angle theta that is a mechanical angle of an angular region of the tip end wall portion of the tooth portion along the circumferential direction of the outer periphery of the rotor is 40 DEG to 120 DEG,
the circumferential position of the tooth portion set according to the phase of the rotor when the counter-induced voltage is 0 is set as a reference position, and the angle ratio R of the travel-side angle θ 1, which is the angle on the rotational travel direction side of the rotor obtained by dividing the angular region into two at the reference position, to the tooth angle θ, i.e., θ 1/θ, is 0.51 or more.
2. The single-phase electric motor of claim 1,
the tooth angle is more than 80 degrees,
the angle ratio R is 0.65 or less.
3. The single-phase electric motor of claim 1,
the stator core includes a yoke portion surrounding an outer periphery of the rotor, and a pair of tooth forming portions of the yoke portion provided across the rotor,
the tooth portions are provided to protrude from the tooth forming portions toward the rotor,
the yoke forms an open-loop magnetic circuit.
4. The single-phase electric motor of claim 3,
the yoke portion includes: a pair of opposed side portions each having the tooth forming portion; and a connecting side portion connecting the pair of opposing side portions, wherein the yoke portion is formed in a shape of "コ" when viewed in an axial direction of the rotor.
5. The single-phase electric motor of claim 1,
the stator core includes: a yoke portion surrounding an outer periphery of the rotor; and a pair of tooth forming portions of the yoke portion provided across the rotor,
the tooth portions are provided to protrude from the tooth forming portions toward the rotor,
the yoke forms a closed magnetic circuit.
6. The single-phase electric motor of claim 5,
the yoke is formed in a rectangular shape including a pair of long side portions and a pair of short side portions when viewed in an axial direction of the rotor,
the tooth portions are formed on the respective long side portions.
7. The single-phase electric motor of claim 5,
the winding wire wound around the teeth is disposed at a position separated from the peripheral wall surface of the teeth.
8. The single-phase motor according to any one of claims 3 to 7,
the front end wall portion of each tooth portion is formed in an arc shape along the outer periphery of the rotor,
the protrusion amount of the tip end wall portion from the tooth forming portion is set to be different between one edge side and the other edge side of the tip end wall portion.
9. The single-phase motor according to any one of claims 1 to 7,
the single-phase motor is connected to an AC power supply for setting the motor rotation speed to 70000rpm or more.
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| JP2017233246A JP2019103294A (en) | 2017-12-05 | 2017-12-05 | Single-phase motor |
| JP2017-233246 | 2017-12-05 |
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| CN112821701B (en) * | 2019-11-18 | 2022-07-08 | 珠海格力电器股份有限公司 | Single-phase motor |
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| JPH1023690A (en) * | 1996-06-28 | 1998-01-23 | Sankyo Seiki Mfg Co Ltd | Motor |
| JP3462043B2 (en) * | 1997-06-25 | 2003-11-05 | 株式会社イワキ | Synchronous motor |
| MX2016006404A (en) * | 2015-05-21 | 2017-03-30 | Johnson Electric Sa | Single phase brushless motor and electric apparatus having the same. |
| CN106169852A (en) * | 2015-05-21 | 2016-11-30 | 德昌电机(深圳)有限公司 | Brushless single phase motor and electric tool |
-
2017
- 2017-12-05 JP JP2017233246A patent/JP2019103294A/en active Pending
-
2018
- 2018-10-16 CN CN201811203190.1A patent/CN109873542B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0898487A (en) * | 1994-09-28 | 1996-04-12 | Victor Co Of Japan Ltd | Brushless motor |
| CN1579043A (en) * | 2002-03-29 | 2005-02-09 | 松下电器产业株式会社 | Motor |
| JP2005269852A (en) * | 2004-03-22 | 2005-09-29 | Matsushita Electric Ind Co Ltd | Brushless motor |
| JP2012029515A (en) * | 2010-07-27 | 2012-02-09 | Minebea Co Ltd | Single-phase brushless motor |
| JP2012029540A (en) * | 2010-07-28 | 2012-02-09 | Minebea Co Ltd | Single-phase brushless motor |
| CN105356708A (en) * | 2015-12-24 | 2016-02-24 | 浙江科技学院 | Electro-magnetic flux switching two-phase square-wave motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109873542A (en) | 2019-06-11 |
| JP2019103294A (en) | 2019-06-24 |
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