JP2005020940A - Torque motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque motor which can improve a size reduction and a weight reduction by constituting a rotor and a stator so that a necessary operating angle range may be satisfied in the torque motor having an operating angle range of less than 180°. <P>SOLUTION: The torque motor includes even number of magnets (12a-12d) disposed on a periphery to an axis of rotation in the rotor (10) so that poles of the outer periphery are different from poles of the outer periphery of the adjacent magnets. The torque motor further includes the stators (20, 40) having single or a plurality of the cores (23, 43) having communicating parts for communicating with the magnetic poles and coils (30, 50) provided in the communicating parts of the cores. Each core has magnetic poles opposed to the rotor at least at two positions. In the magnets, angles along the periphery of the rotor in the magnets of S poles on the outer periphery are set to first predetermined angles (β1, β3), and angles along the periphery of the rotor in the magnets of N poles on the outer periphery are set to second predetermined angles (β2, β4) different from the first predetermined angles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a torque motor used in an operating angle range of less than 180 degrees (for example, an operating angle range of 90 degrees).
[0002]
[Prior art]
Conventionally, for example, a torque motor having an operating angle range of less than 180 degrees has been used for a throttle valve of a vehicle.
A schematic diagram of a conventional torque motor 1 is shown in FIG. Conventionally, two magnets 12 are provided on the circumference of the rotor 10 so that the outer circumferences are N poles and S poles, and the angles of the outer circumferences of the two magnets 12 are each 180 degrees (2 The angles of the individual magnets 12 are the same). The stator 20 includes a core 23 having two magnetic pole portions 21 and 22 and a coil 30, and connects “the center P 21 of one magnetic pole portion” and “the rotation center P 10 of the rotor”. The angle formed by the straight line and the straight line connecting “the center P22 of the other magnetic pole part” and “the rotation center P10 of the rotor” is 180 degrees.
Here, for example, when this torque motor 1 is used to drive the throttle valve 80, the operating angle range of the rotor is 90 degrees. 6A shows a cross section AA of the conventional torque motor 1 shown in FIG. 5, and FIG. 6B shows the torque / rotation angle characteristics of the torque motor 1 shown in FIG. 6A. It is a graph which shows an outline.
Conventionally, there has been proposed a rotary solenoid actuator that is provided with a through hole, a detent groove or the like in the core and controls within a predetermined operating angle range (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 1-92541
[Problems to be solved by the invention]
In the torque motor in the actuator proposed in Patent Document 1, the shape of the magnetic pole part in the stator is uniform, and the magnet angle (angle along the circumference) of the rotor is uniform. The degree of freedom is small. For this reason, when the torque characteristics required in the entire operating angle range are satisfied, the physique and mass (coil, core size, etc.) tend to be relatively large. For example, the required torque characteristics may be slightly exceeded at some operating angles, and the required torque characteristics may be exceeded more than necessary at other operating angles. In this case, the physique and mass are increased due to excessive torque characteristics, which hinders downsizing and weight reduction.
The present invention was devised in view of these points, and in a torque motor having an operating angle range of less than 180 degrees, the stator and the core are configured to satisfy the required torque characteristics, thereby reducing the size. It is another object of the present invention to provide a torque motor that can further improve weight reduction.
[0005]
[Means for Solving the Problems]
As means for solving the above problems, a first invention of the present invention is a torque motor as set forth in claim 1.
The torque motor according to claim 1 is a torque motor including a rotor and a stator, and an operating angle range of the rotor is less than 180 degrees, and the rotor is provided with an even number of magnets on a circumference with respect to the rotation shaft, Each magnet is arranged so that the outer pole is different from the outer pole of an adjacent magnet. The stator includes a core having a communicating portion that communicates with each magnetic pole portion, and a coil provided in the communicating portion of the core, each of which is composed of one or more, and each core has a magnetic pole portion that faces the rotor. There are at least two places. In the magnet, an angle along the circumference of the rotor in the magnet having the outer circumference of the S pole is set as a first predetermined angle, and an angle along the circumference of the rotor in the magnet having the outer circumference is the first predetermined angle. A different second predetermined angle is set (see the first embodiment).
Thus, torque characteristics can be changed by changing the magnet angle (angle along the circumference) of each pole (N pole and S pole). Thereby, the required torque characteristics can be satisfied without increasing the physique and mass more than necessary, and the reduction in size and weight can be further improved.
[0006]
A second invention of the present invention is a torque motor as set forth in claim 2.
A torque motor according to a second aspect is the torque motor according to the first aspect, wherein the core includes two magnetic pole portions, and from one magnetic pole portion toward the other magnetic pole portion, A gap having a predetermined width in the same direction is provided along the core, and the core and each magnetic pole portion are divided into two, and one set of stators is composed of two cores (see the second embodiment). ).
In this case, the torque characteristic can be changed relatively easily by changing the width of the gap between the two cores in one set of stators. Thereby, the required torque characteristics can be satisfied without increasing the physique and mass more than necessary, and the reduction in size and weight can be further improved.
[0007]
A third aspect of the present invention is a torque motor as set forth in the third aspect.
A torque motor according to a third aspect is the torque motor according to the second aspect, wherein, in each core, an area of one magnetic pole portion facing the rotor and an area of the other magnetic pole portion facing the rotor are The core and each magnetic pole part are divided into two parts so as to be different (see the third embodiment).
In this case, the torque characteristics can be changed relatively easily by changing the ratio of the area of one magnetic pole part (area facing the rotor) and the area of the other magnetic pole part (area facing the rotor) of each core. be able to. Thereby, the required torque characteristics can be satisfied without increasing the physique and mass more than necessary, and the reduction in size and weight can be further improved.
[0008]
According to a fourth aspect of the present invention, there is provided a torque motor as set forth in the fourth aspect.
A torque motor according to a fourth aspect of the present invention is the torque motor according to the second or third aspect, wherein the core divided into two is coupled by a predetermined distance in the same direction as the direction of the magnetic flux in the communicating portion (second See the embodiment).
In this case, the torque characteristic can be changed relatively easily by changing the coupling distance. Thereby, the required torque characteristics can be satisfied without increasing the physique and mass more than necessary, and the reduction in size and weight can be further improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a first embodiment of a torque motor 1 of the present invention.
In the first to third embodiments described below, the rotor 10 in the torque motor 1 is provided with an even number of magnets on the circumference with respect to the rotating shaft, and each magnet is a magnet having adjacent poles on the outer circumference. Arranged differently from the outer poles. Further, the angle of the magnet having the S pole on the outer periphery (first predetermined angle: β1 or β3) and the angle of the magnet having the N pole on the outer periphery (second predetermined angle: β2 or β4) are set to different angles.
In the embodiment described below, an example is shown in which the torque motor 1 is applied to driving a throttle valve of a vehicle (the operating angle range is about 90 degrees).
[0010]
◆ [First embodiment (FIGS. 1 and 2)]
FIG. 1A shows an example of a torque motor 1 having one stator 20 composed of a coil 30 and a core 23. In the conventional torque motor, the angles of the magnets provided in the rotor are the same, and the degree of freedom in torque characteristics is small. However, in the embodiments described below (first to third embodiments), the angle of each magnet provided in the rotor is set to be different, and the torque characteristics are changed in accordance with the required characteristics.
1 (B) and 1 (C) show two pieces of the first stator 20 composed of the coil 30 and the core 23 and the second stator 40 composed of the coil 50 and the core 43. The example of the torque motor 1 which has a stator is shown. 1B and 1C show the same torque motor 1.
FIG. 2A shows an example of the torque motor 1 having one stator 20 composed of coils 31 to 34 and a core 23.
As described above, the stator includes a single core and a single coil (FIG. 1 (A)), a plurality and a plurality (FIG. 1 (B) and (C)), and a single and a plurality (FIG. 2 (A)). can do. In addition, although not shown in figure, a core and a coil can also be comprised by multiple and single.
[0011]
In the conventional torque motor, when the degree of freedom of the torque characteristics is small and the required characteristics are satisfied over the entire operating angle range, the size and mass of the torque motor may increase. However, in the torque motor 1 shown in FIG. 1A, the torque characteristics of the torque motor 1 can be changed relatively easily by adjusting the magnet angles (β1 and β2).
The torque motor 1 shown in FIG. 1 (A) is an example of a torque motor capable of setting the operating angle range to 180 degrees, and the torque motor 1 shown in FIGS. 1 (B), 1 (C), and 2 (A). Is an example of a torque motor having an operating angle range of 90 degrees (in FIG. 1C, the angle φ is the operating angle range). Hereinafter, the torque motor 1 shown in FIGS. 1B and 1C will be described.
[0012]
In the torque motor 1 shown in FIG. 1B, the torque characteristics can be changed relatively easily by adjusting the magnet angles (β3 and β4).
The magnets 12a to 12d provided in the rotor 10 are arranged so that the outer peripheral poles of adjacent magnets are different (arranged so that the outer peripheral poles alternate with N and S poles). Each of the cores 23 and 43 includes two magnetic pole portions 21 and 22 and magnetic pole portions 41 and 42, respectively.
[0013]
Next, FIG. 2B shows a graph of torque / rotation angle characteristics (in this case, the torque motor 1 has the structure shown in FIGS. 1B and 1C).
In the graph shown in FIG. 2B, the graph Sg11 shows the case where (angle β3, angle β4) is (90 degrees, 90 degrees), and the graph Sg12 shows the case (80 degrees, 100 degrees). The graph Sg13 shows the case of (70 degrees, 110 degrees).
In this way, the magnets are arranged so that the outer peripheral poles are alternated, and the south pole angle β3 (first predetermined angle) and the north pole angle β4 (second predetermined angle) are set according to the required characteristics. If necessary, sufficient torque characteristics can be satisfied without increasing the physique and mass more than necessary.
Thereby, since the size of a core etc. beyond a required characteristic is not required and it can fit in an appropriate size, size reduction and weight reduction of the torque motor 1 can be improved more.
[0014]
◆ [Second Embodiment (FIG. 3)]
The torque motor 1 shown in the second embodiment shown in FIGS. 3 (A) and 3 (B) is different from the first embodiment (torque motor 1 shown in FIG. 1 (B)) in the core 23 and the core. The structure of 43 is different. Hereinafter, differences from the first embodiment will be described.
In the example shown in FIG. 3A, the stator 20 includes two cores 23a and 23b, and the rotor 10 moves from one magnetic pole part 21a and 21b toward the other magnetic pole part 22a and 22b. A gap having a predetermined width Wd in the same direction as the rotation axis is provided along the core. As a result, the core is divided into two parts (divided into a core 23a and a core 23b). The stator 40 also has the same structure, and a description thereof is omitted.
In the example shown in FIG. 3 (B), with respect to the torque motor 1 shown in FIG. 3 (A), in each of the stators 20 and 40, the core divided into two is used as a communication part that connects the magnetic pole part and the magnetic pole part. Thus, they are coupled by a predetermined distance Lc in the same direction as the direction of the magnetic flux.
[0015]
Next, FIGS. 3C and 3D show graphs of torque / rotational angle characteristics.
The graph shown in FIG. 3C is a graph for the torque motor 1 shown in FIG. 3A. The graph Sg21 shows the case where (predetermined width Wd) is (0 mm), and the graph Sg22 shows (predetermined width). The case where (Wd) is (1 mm) is shown, and the graph Sg23 shows the case where (predetermined width Wd) is (2 mm).
From the torque / rotation angle characteristic graph shown in FIG. 3C, when the predetermined width Wd is increased, the torque less than 50 degrees of rotation slightly decreases and the torque of more than 50 degrees increases slightly. I understand that.
In this way, if the interval of the predetermined width Wd in the core divided into two is set according to the required characteristics, the necessary torque characteristics can be satisfied without increasing the physique and mass more than necessary. Can do.
Thereby, since the size of a core etc. beyond a required characteristic is not required and it can fit in an appropriate size, size reduction and weight reduction of the torque motor 1 can be improved more.
[0016]
The graph shown in FIG. 3D is a graph for the torque motor 1 shown in FIG. 3B, the graph Sg31 shows the case where (predetermined distance Lc) is (0 mm), and the graph Sg32 shows (predetermined distance). Lc) shows a case of (3 mm), and graph Sg33 shows a case where (predetermined distance Lc) is (6 mm).
From the torque / rotation angle characteristic graph shown in FIG. 3 (D), it can be seen that when the predetermined distance Lc increases, the torque less than 45 degrees increases slightly and the torque greater than 45 degrees decreases slightly. .
Thus, if the predetermined distance Lc of the coupling in the core divided into two is set according to the required characteristics, the necessary torque characteristics can be satisfied without increasing the physique and mass more than necessary. Can do.
Thereby, since the size of a core etc. beyond a required characteristic is not required and it can fit in an appropriate size, size reduction and weight reduction of the torque motor 1 can be improved more.
[0017]
◆ [Third Embodiment (FIG. 4)]
The torque motor 1 shown in the third embodiment shown in FIGS. 4A and 4B is different from the second embodiment (FIG. 3A) in the position of the gap having a predetermined width Wd. The ratio of the area of each magnetic pole part (area of the magnetic pole part facing the rotor) is different. Hereinafter, differences from the second embodiment will be described.
In the example shown in FIG. 4A, in each of the cores 23a, 23b, 43a, and 43b, the core and the core are arranged so that the area of one magnetic pole portion facing the rotor is different from the area of the other magnetic pole portion facing the rotor. Each magnetic pole is divided into two.
For example, in the core 23a of the stator 20 shown in FIG. 4A, “the area of one magnetic pole part 21a facing the rotor (area corresponding to W21a)” <“the area of the other magnetic pole part 22a facing the rotor ( The core 23a and the core 23b are divided so as to have an area corresponding to W22a). In this case, in the core 23b of the stator 20, "the area of one magnetic pole part 21b facing the rotor (area corresponding to W21b)">"the area of the other magnetic pole part 22b facing the rotor (corresponding to W22b). Area) ”.
Further, since the core 43a and the core 43b of the stator 40 are the same, description thereof is omitted.
[0018]
When the torque motor 1 shown in FIG. 4B has a structure in which each of the stators 20 and 40 is divided into two with respect to the torque motor 1 shown in FIG. The cross section perpendicular to the direction of (1) increases or decreases gradually from one magnetic pole portion toward the other magnetic pole portion. For example, in FIG. 4B, Wa <Wb in the Wa portion and Wb portion in the path from one magnetic pole portion to the other magnetic pole portion, and the width gradually increases from the Wa portion toward the Wb portion. The cross section perpendicular | vertical with respect to the direction of magnetic flux is comprised so that it may increase gradually.
In the first and second embodiments, the cores are arranged in a line-symmetric shape (symmetric in the figure), and in this case, the forward direction (counterclockwise direction) and the reverse direction (clockwise direction) ), The torque characteristics in the forward direction and the reverse direction can be made different in this embodiment.
[0019]
For example, when the torque motor 1 is applied to an on-off valve of a vehicle, it is rare that the required torque characteristics are the same in both the opening and closing directions, and usually the required torque characteristics are different in the opening direction and the closing direction. For example, when used as an intake throttle valve, since the pressure by the intake air is applied, the required torque characteristic in the opening direction has a larger value. Further, when the driving method is such that energization of the coil is limited to one direction, for example, the driving in the closing direction is performed by the elastic force of an elastic body such as a spring. In this case, the driving force in the opening direction is generated by the torque motor 1, but the driving force in the closing direction is not necessary at all. In contrast to such required torque characteristics, the torque motor of the prior art has a large margin in the torque characteristics of either opening and closing, and has an unnecessarily high performance, and is large in size.
[0020]
For example, when the torque motor 1 according to the present embodiment is used for a throttle valve of a vehicle, a torque / rotation angle characteristic graph as shown in FIG. 4C can be obtained. The graph shown in FIG. 4C is a graph for the torque motor 1 shown in FIG. 4A, and the graphs Sg41 (forward direction) and Sg43 (reverse direction) are (W21a = W22a = W21b = W22b = W41a =). The case of W42a = W41b = W42b) is shown. Graphs Sg42 (forward rotation direction) and Sg44 (reverse rotation direction) indicate the case of (W21a <W22a, W21b> W22b, W41a <W42a, W41b> W42b).
[0021]
From the torque / rotation angle characteristic graph shown in FIG. 4C, when the ratio of the area of the magnetic pole portion provided at both ends of the core is changed, the torque in the forward rotation direction slightly increases and the torque in the reverse rotation direction slightly decreases. You can see that
In this way, the area of one magnetic pole part (the area of the surface facing the rotor) and the area of the other magnetic pole part (the area of the surface facing the rotor) of each core are set according to the required characteristics. As a result, the necessary torque characteristics can be satisfied without increasing the physique and mass more than necessary.
Thereby, since the size of a core etc. beyond a required characteristic is not required and it can fit in an appropriate size, size reduction and weight reduction of the torque motor 1 can be improved more.
[0022]
In the torque motor 1 shown in FIGS. 4 (A) and 4 (B), as shown in FIG. 3 (B), a predetermined distance Lc in the same direction as the direction of the magnetic flux at the communicating portion of the core divided into two. The torque characteristics may be changed by combining them only.
[0023]
The torque motor 1 of the present invention is not limited to the configuration, shape, structure, etc. described in the present embodiment, and various modifications, additions, and deletions can be made without changing the gist of the present invention. Moreover, the material of the magnet 12, the core 23, etc. is not specifically limited.
In the description of the present embodiment, the throttle valve in which the operating angle range of the rotor 10 is 90 degrees has been described as an example. However, the torque motor 1 of the present invention can be applied to various control systems having an operating angle range of less than 180 degrees in addition to the throttle valve of the vehicle.
The torque / rotation angle characteristics described in the present embodiment are not limited to the graphs used in the description of each embodiment.
The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.
[0024]
【The invention's effect】
As described above, when the torque motor according to any one of claims 1 to 4 is used, the stator and the core are configured to satisfy the required torque characteristics in the torque motor having an operating angle range of less than 180 degrees. Thereby, the torque motor which can improve size reduction and weight reduction more can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic structure of a first embodiment in a torque motor 1 of the present invention.
FIG. 2 is a diagram for explaining an example of another structure of the first embodiment and torque / rotation angle characteristics in the torque motor 1 of the present invention.
FIG. 3 is a diagram illustrating a schematic structure and torque / rotation angle characteristics of a second embodiment in a torque motor 1 of the present invention.
FIG. 4 is a diagram illustrating a schematic structure and torque / rotation angle characteristics of a third embodiment in a torque motor 1 of the present invention.
FIG. 5 is a diagram illustrating the structure of a conventional torque motor.
FIG. 6 is a diagram illustrating the structure and torque / rotation angle characteristics of a conventional torque motor.
[Explanation of symbols]
1 Torque motor 10 Rotor 12 Magnet 20 Stator (the other stator)
21, 21a, 21b, 22, 22a, 22b Magnetic pole portions 23, 23a, 23b Core 30 Coil 40 Stator (one stator)
41a, 41b, 42a, 42b Magnetic pole portions 43a, 43b Core (first core, second core)
50 coils

Claims (4)

A torque motor comprising a rotor and a stator, the working angle range of the rotor being less than 180 degrees,
The rotor is provided with an even number of magnets on the circumference with respect to the rotation axis, and each magnet is arranged such that the outer pole is different from the outer pole of the adjacent magnet,
The stator has a core having a communication part that communicates each magnetic pole part, and a coil provided in the communication part of the core is configured by one or more,
Each core has at least two magnetic pole portions facing the rotor,
In the magnet, an angle along the circumference of the rotor in the magnet having the outer circumference of the S pole is set to a first predetermined angle, and an angle along the circumference of the rotor in the magnet having the outer circumference of the N pole is different from the first predetermined angle. 2 Set to a predetermined angle,
Torque motor characterized by that. The torque motor according to claim 1,
The core includes two magnetic pole portions, and a gap having a predetermined width in the same direction as the rotation axis of the rotor is provided along the core from one magnetic pole portion to the other magnetic pole portion, and the core and two magnetic pole portions are provided. Having a structure divided into two, and a set of stators composed of two cores,
Torque motor characterized by that. The torque motor according to claim 2,
In each core, the core and each magnetic pole part are divided into two so that the area of one magnetic pole part facing the rotor and the area of the other magnetic pole part facing the rotor are different,
Torque motor characterized by that. The torque motor according to claim 2 or 3,
The core divided into two is coupled by a predetermined distance in the same direction as the direction of the magnetic flux in the communication part.
Torque motor characterized by that.

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