JP2012010245A - Rotation driving device and radio wave lens antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation driving device and a radio wave lens antenna device capable of downsizing and improving operation accuracy at the same time.SOLUTION: The rotation driving device and a radio wave lens antenna device, comprising an external cylinder axis 5 and an internal cylinder axis 4, both of which have an output end and axially rotate independently from each other, drive a pair of Luneberg lenses 21 by a rotational driving force of the output end of the external cylinder axis 5 as a driving source and drive a pair of feeds 22 by a rotational driving force generated by a difference of rotation speeds of output ends of external cylinder axis 5 and internal cylinder axis 4.

Description

  The present invention relates to a rotary drive device that is used in, for example, a radar device and can cause a driven body to perform a biaxial operation independently, and a radio wave lens antenna device including the rotary drive device.

  For example, in meteorological observation, high-frequency radio waves such as microwaves are transmitted toward an object, and the reflected wave from the object is received to detect the size, shape, distance, moving speed, etc. of the object. It has been broken. As a means for performing such detection, a radar apparatus using a radio wave lens and a radiator has been proposed (for example, Patent Document 1).

  FIG. 8 shows an example of a conventional radar device. The radar apparatus X shown in the figure includes a pair of Luneberg lenses 92a and a pair of feeds 92b housed in a radome 91a. The pair of Luneberg lenses 92a are arranged along the elevation axis Ox. The pair of Luneberg lenses 92a and the pair of feeds 92b are rotatable together with the radome 91a around the azimuth axis Oy. The radome 91a is supported by the motor chamber 91b. The motor M1 is accommodated in the motor chamber 91b. The motor M1 is a drive source that drives the rotary shaft 94 extending from the radome 91a. On the other hand, the feed 92b is supported by the rotating shaft 93 and is rotatable around the elevation axis Ox. The rotating shaft body 93 is connected to a motor M2 as a drive source. In meteorological observation using the radar device X, the entire radome 91a is rotated around the azimuth axis Oy while the pair of feeds 92b are rotated around the elevation axis Ox with respect to the pair of Luneberg lenses 92a. Observation from an azimuth of 0 to 360 degrees and an elevation angle from a horizontal plane of 0 to 90 degrees is possible.

  However, in the radar apparatus X, it is necessary to rotate the motor M2 and the radome 91a covering these together with the pair of Luneberg lenses 92a and the pair of feeds 92b as a whole around the azimuth axis Oy. Since these rotating parts have considerable inertia, the motor M1 as a drive source is required to have a high output. In addition, it is necessary to secure a power supply path to the motor M2 via the rotating shaft body 94 that is a rotating body. Furthermore, since it is necessary to house the motor M2 and the rotating mechanism parts associated therewith in the radome 91a, there is a problem in that the radome 91a and thus the entire radar device X are increased in size. For accurate detection, it is essential to accurately grasp the rotational position of the feed 92b. For this purpose, it is compelling to arrange a sensor (not shown) for detecting the rotational position of the feed 92b in the radome 91a. Thereby, the enlargement of the radome 91a is further increased.

JP 2007-181114 A

  The present invention has been conceived under the circumstances described above, and is a rotation drive device capable of achieving both reduction in size and improvement in operation accuracy, and a radio wave lens antenna including the rotation drive device. An object is to provide an apparatus.

  The rotary drive device provided by the present invention includes first and second rotating shaft bodies each having an output end and rotating independently of each other, and the output end of the first rotating shaft body. The first driven body is driven using the rotational driving force of the first driving body as a driving source, and the second driven body is driven by the rotational driving force generated by the rotational speed difference between the output ends of the first and second rotating shaft bodies. It is a feature.

  According to such a configuration, the first rotating shaft body and the second rotating shaft body are not in a relationship in which one is rotated by the other. For this reason, it is not necessary to rotate the driving source for driving the first rotating shaft body and the second rotating shaft body around the first central axis. As a result, it is possible to reduce the size and improve the operation accuracy.

  In a preferred embodiment of the present invention, the first rotating shaft body rotates around a first central axis, and the first and second driven bodies are moved to the first central axis by the rotation of the first rotating shaft body. Around the second central axis extending in the radial direction of the cylindrical coordinate system having the first central axis as the central axis in accordance with the rotational speed difference between the first rotary shaft body and the second rotary shaft body. The second driven body is rotated.

  In a preferred embodiment of the present invention, the second central axis passes through the first driven body.

  In a preferred embodiment of the present invention, the apparatus further includes a third rotating shaft body supported by the first rotating shaft body and disposed in parallel to the second central axis, and the second rotating shaft body. The rotating shaft body and the second driven body are connected via the third rotating shaft body.

  In a preferred embodiment of the present invention, the first rotating shaft body and the second rotating shaft body have a concentric cross section in which one is inserted into the other.

  In a preferred embodiment of the present invention, the second rotating shaft body is connected to the third rotating shaft body via a bevel gear.

  In a preferred embodiment of the present invention, the rotary connection is inserted through the first rotary shaft body and the second rotary shaft body and rotates about the first central axis together with the first rotary shaft body. A power supply shaft having a child is further provided.

  In a preferred embodiment of the present invention, a first motor coupled to one of the first rotating shaft body and the second rotating shaft body, an input shaft coupled to the first motor, and the first A differential speed reducer having an output shaft connected to one of the rotating shaft body and the second rotating shaft body, and a differential shaft that causes a difference between the rotational speed of the output shaft and the rotational speed of the input shaft And a second motor coupled to the differential shaft of the differential reducer.

  In a preferred embodiment of the present invention, a rotation amount detecting means for detecting the rotation amount of the second motor is further provided.

  In a preferred embodiment of the present invention, a first motor coupled to one of the first rotating shaft body and the second rotating shaft body, and the first rotating shaft body and the second rotating shaft body. And a second motor coupled to the other.

  According to another aspect of the present invention, a radio wave lens antenna device including the above-described rotation driving device is provided. This radio wave lens antenna apparatus includes a radio wave lens formed using a dielectric so that a relative permittivity changes at a predetermined rate in a radial direction, and a primary radiator disposed in accordance with a focal point of the radio wave lens. The radio wave lens that is the first driven body and the primary radiator that is the second driven body are the first rotating shaft body having the first central axis that is the azimuth axis as the rotation center, The primary radiator is supported so as to be rotatable about an azimuth axis, and is further supported to be rotatable about a second central axis that is an elevation axis and passes through the center of the radio wave lens.

  According to such a configuration, since it is not necessary to include the radome in the rotating portion while independently controlling the rotation around the azimuth axis and the elevation axis, the radio wave lens and the primary radiator are arranged around the azimuth axis. The total weight of the rotating parts to be rotated can be reduced, and as a result, the scanning speed can be increased.

  In a preferred embodiment of the present invention, the radio wave lens antenna device further includes a radome that covers the radio wave lens and the primary radiator, the radome being fixedly supported on the motor chamber, and the first rotating shaft body. Is inserted through an opening provided in a partition wall between the radome and the motor chamber.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

1 is an overall schematic diagram showing a radar device using a rotary drive device according to an embodiment of the present invention. It is principal part sectional drawing which shows the outer cylinder axis | shaft of the rotation drive device shown in FIG. 1, an inner cylinder axis | shaft, and a feed shaft. It is a principal part top view which shows the rotational drive apparatus shown in FIG. It is a principal part side view which shows the rotational drive apparatus shown in FIG. It is a principal part front view which shows the rotational drive apparatus shown in FIG. It is a principal part front view which shows the rotational drive apparatus shown in FIG. It is a whole schematic diagram which shows the radar apparatus using the rotational drive apparatus based on other embodiment of this invention. It is the whole schematic figure which shows an example of the radar apparatus using the conventional rotational drive apparatus.

  FIG. 1 shows a radar device using a rotary drive device according to an embodiment of the present invention. The rotational drive device A1 of this embodiment includes an elevation rod 25, a power feeding shaft 3, an inner cylinder shaft 4, an outer cylinder shaft 5, a differential speed reducer 7, and motors M1 and M2. This rotational drive device A1 constitutes a radar device B1 together with a radome 11, a motor chamber 12, a pair of Luneberg lenses 21, and a pair of feeds 22. The radar device B1 is a bistatic small-scale weather radar used for weather observation such as the size of precipitation areas and precipitation. Small weather radars have a shorter observation range than large weather radars, but can easily increase the scanning speed.

  The radome 11 is generally molded by FRP (Fiber Reinforced Plastics). The radome 11 may adopt a sandwich structure in which a core material such as a high foam material or a honeycomb is sandwiched between FRPs. The radome 11 is used to protect or waterproof the antenna of the radar device B1 arranged outdoors from strong winds such as typhoons, and has a certain weight for securing strength. The upper portion of the radome 11 has a dome shape so that radio waves are incident as vertically as possible to improve transmission characteristics, and raindrops and snow can easily fall, and the lower portion is a cylindrical shape. The radome 11 houses a pair of Luneberg lenses 21, a pair of feeds 22, and an elevation rod 25. The central axis of the cylindrical portion is the azimuth axis Oy, and the radial axis is the elevation axis Ox. The motor chamber 12 has a cylindrical shape connected to the lower end of the radome 11 and houses the differential speed reducer 7 and the motors M1 and M2. The radome 11 and the motor chamber 12 are integrally connected to each other via a partition wall 13. By housing the motors M1 and M2 in the motor chamber 12 and fixing the radome 11 to the non-rotating part, the total weight of the rotating part can be reduced, and high-speed rotation is possible even as a small weather radar.

  The pair of Luneberg lenses 21 is a kind of dielectric lens and corresponds to an example of a radio wave lens referred to in the present invention. The Luneberg lens 21 has a spherical shape and is formed such that the relative permittivity changes according to the distance from the center thereof, and is made of a foamed material such as polyethylene resin, polypropylene resin, or polystyrene resin. With such a configuration, the Luneberg lens 21 is a radio wave lens having a clear focus in almost all directions. The pair of Luneberg lenses 21 are arranged side by side in the elevation axis Ox direction, and are supported by the outer cylinder shaft 5.

  The pair of feeds 22 corresponds to an example of a radiator used for transmission / reception of high-frequency radio waves such as microwaves, and constitutes a pair of antennas together with the pair of Luneberg lenses 21. For example, one antenna is used for transmission and the other is used for reception. The feed 22 is arranged at the focal point of the Luneberg lens 21. High-frequency radio waves are radiated from the feed-side feed 22 toward the center of the Luneberg lens 21 and radiated as plane waves from the Luneberg lens 21. The high-frequency radio wave (plane wave) reflected by the object is collected by the Luneberg lens 21 on the receiving-side feed 22 arranged at the focal position and picked up by the feed 22. The feed 22 may be any antenna having a wavelength order such as a horn antenna, a microstrip antenna, a spiral antenna, or a slot antenna, and can be reduced in size.

  The pair of feeds 22 are supported by a gear 24 via a bracket 23. The gear 24 rotates around the elevation axis Ox. The gear 24 meshes with gears 26 attached to both ends of the elevation rod 25. The elevation rod 25 is supported so as to be rotatable around an axis parallel to the elevation axis Ox. When the elevation rod 25 rotates, the pair of feeds 22 rotates around the elevation axis Ox around the pair of Luneberg lenses 21 accordingly.

  The partition wall 13 is provided with an opening through which the outer cylinder shaft 5, the inner cylinder shaft 4, and the feed shaft 3 pass. As shown in FIGS. 1 and 2, the outer cylinder shaft 5, the inner cylinder shaft 4, and the power feeding shaft 3 are arranged concentrically with each other with the azimuth axis Oy as a central axis. The outer cylinder shaft 5 is supported so as to be rotatable around the azimuth axis Oy with respect to the radome 11, and supports the elevation rod 25 via a support 51. Accordingly, when the outer cylinder shaft 5 rotates around the azimuth axis Oy, the pair of Luneberg lenses 21 and the pair of feeds 22 rotate together around the azimuth axis Oy regardless of the state of the inner cylinder shaft 4.

  The inner cylinder shaft 4 is inserted into the outer cylinder shaft 5 and is rotatable around the azimuth axis Oy independently of the outer cylinder shaft 5. A bevel gear 41 is provided at the upper end of the inner cylinder shaft 4. The bevel gear 41 meshes with a bevel gear 27 provided on the elevation rod 25.

  If the outer cylinder shaft 5 and the inner cylinder shaft 4 have exactly the same rotational speed, the bevel gear 41 and the bevel gear 27 do not rotate relative to each other. In this case, the elevation rod 25 does not rotate around an axis parallel to the elevation axis Ox. For this reason, the pair of feeds 22 are stationary with respect to the pair of Luneberg lenses 21. On the other hand, when there is a difference in the rotational speed between the outer cylinder shaft 5 and the inner cylinder shaft 4, relative rotation occurs between the bevel gear 41 and the bevel gear 27. In this case, the elevation lot 25 rotates around an axis parallel to the elevation axis Ox. For this reason, the pair of feeds 22 rotate relative to the pair of Luneberg lenses 21 around the elevation axis Ox.

  The power feeding shaft 3 is used for feeding power to the feed 22 and is inserted into the inner cylindrical shaft 4. In the present embodiment, the power feeding shaft 3 rotates around the azimuth axis Oy together with the outer cylinder shaft 5. A slip ring 31 serving as an electron supply is provided at the lower end of the power supply shaft 3. The slip ring 31 is a conductive component for supplying power to the rotatable feed 22 from a fixed-side power supply section provided in the motor chamber 12.

  As shown in FIG. 1, two motors M <b> 1 and M <b> 2 are arranged in the motor chamber 12. As shown in FIGS. 3 to 5, a worm gear 61 is connected to the output shaft 60 of the motor M <b> 1. The worm gear 61 has output shafts 62 and 63. The output shaft 62 extends from the worm gear 61 in the upward direction, and a pulley 64 is provided at the upper end thereof. A belt 711 is hung on the pulley 64 and the pulley 52 provided on the outer cylinder shaft 5. Thereby, the outer cylinder shaft 5 is rotated by the rotation of the output shaft 62. A pulley 65 is provided on the output shaft 63.

  The differential speed reducer 7 has an input shaft 71, an output shaft 73, and a differential shaft 72. The differential speed reducer 7 causes a difference between the rotational speed of the input shaft 71 and the rotational speed of the output shaft 73 according to the rotational speed of the differential shaft 72. For example, if the rotational speed of the input shaft 71 is N1, the rotational speed of the output shaft 73 is N3, and the rotational speed of the differential shaft 72 is N2, N3 = N1 / C1 ± N2 / C2 (C1 and C2 are both constants) Have the relationship. When the differential shaft 72 rotates in the forward direction, the rotational speed N3 of the output shaft 73 becomes larger than the rotational speed N1 of the input shaft 71, and when the differential shaft 72 reverses, the rotational speed N3 of the output shaft 73 becomes the rotational speed of the input shaft 71. It becomes smaller than the number N1. When the differential shaft 72 is stationary, the rotational speed N3 of the output shaft 73 and the rotational speed N1 of the input shaft 71 are the same.

  A belt 712 is hung on a pulley 74 and a pulley 65 provided on the input shaft 71. Thereby, the input shaft 71 is rotated by the motor M1. As shown in FIGS. 3 and 6, the differential shaft 72 is provided with a pulley 75, and the output shaft 70 of the motor M2 is provided with a pulley 76. A belt 713 is hung on the pulley 75 and the pulley 76. Thereby, the differential shaft 72 is rotated by the motor M2. The output shaft 73 is connected to the worm gear 77. The worm gear 77 has an output shaft 78 extending in the upward direction. A pulley 79 is provided on the output shaft 78. A belt 715 is hung on the pulley 79 and the pulley 42 provided on the inner cylinder shaft 4. Thereby, when the output shaft 73 of the differential speed reducer 7 rotates, the inner cylinder shaft 4 rotates.

  As shown in FIGS. 1, 3, and 4, an elevation sensor unit 8 is disposed in the vicinity of the motor M2. The elevation sensor unit 8 includes an input shaft 80, a moving body 81, and a sensor 82. The input shaft 80 and the differential shaft 72 rotate in conjunction with each other via a pulley and a belt 714 provided on the input shaft 80 and the differential shaft 72, respectively. The moving body 81 is a nut portion of a ball screw connected to the input shaft 80, for example. When the input shaft 80 rotates, the moving body 81 linearly moves according to the rotation direction and amount. The sensor 82 detects the position of the moving body 81 in the linear movement trajectory. By detecting the position of the moving body 81, the rotation direction and the rotation amount of the differential shaft 72 can be detected.

  Next, the operation of the rotation drive device A1 and the radar device B1 will be described.

  When performing weather observation using the radar device B1, in the rotational drive device A1, first, the pair of Luneberg lenses 21 and the pair of feeds 22 are integrally rotated around the azimuth axis Oy. This is performed by rotating the outer cylinder 5 by the motor M1. At this time, if the motor M2 is kept stationary, the inner cylinder shaft 4 rotates at the same rotational speed as the outer cylinder shaft 5. In this case, the pair of feeds 22 do not rotate relative to the pair of Luneberg lenses 21. Observation around all azimuths of 0 to 360 degrees in the horizontal direction is possible by rotation around the azimuth axis Oy. Next, in addition to the rotation around the azimuth axis Oy, the pair of feeds 22 are rotated around the elevation axis Ox around the Luneberg lens 21. As a result, it is possible to observe an elevation angle of 0 to 90 degrees in each horizontal direction. At this time, the motor M2 is rotated to cause a difference between the rotation speed of the outer cylinder shaft 5 and the rotation speed of the inner cylinder shaft 4. The pair of feeds 22 rotate around the elevation axis Ox around the pair of Luneberg lenses 21 in accordance with the rotational speed difference. By appropriately rotating the motor M2 forward and backward, the radar apparatus B1 can perform weather observation for the entire sky region desired from the observation point.

  As described above, although the pair of Luneberg lenses 21 and the pair of feeds 22 are rotated about the azimuth axis Oy, the two motors can be further rotated about the elevation axis Ox. M1 and M2 are both fixed in the motor chamber 12 and do not rotate. In other words, only the minimum necessary components such as the pair of Luneberg lenses 21, the pair of feeds 22, and the elevation rod 25 rotate around the azimuth axis Oy. Further, the radome 11 may be fixed integrally with the motor chamber 12 without rotating around the azimuth axis Oy. For this reason, it is possible to reduce the inertia of the rotating part of the radar apparatus B1, and the output of the motor M1 as a drive source can be reduced. Further, there is no need to arrange the motors M1, M2, etc. in the radome 11. Thereby, size reduction of radome 11 and by extension, radar apparatus B1 can be achieved. Moreover, it is easy to improve the scanning speed of the radar apparatus B1.

  In order to rotate the pair of feeds 22 around the elevation axis Ox, it is only necessary to rotate the motor M2 by the amount that the pair of feeds 22 is to be rotated. That is, the rotation direction of the motor M2 and the rotation direction of the pair of feeds 22 coincide with each other, and the rotation amount of the motor M2 and the rotation amount of the pair of feeds 22 are in a proportional relationship. For this reason, as long as the rotation of the motor M2 is accurately controlled, the pair of feeds 22 can be accurately arranged at a desired position with respect to the pair of Luneberg lenses 21. This is suitable for increasing the observation accuracy of the radar device B1.

  Further, by detecting the rotation of the motor M2 by the elevation sensor unit 8, it is possible to accurately grasp the rotation direction and the rotation amount of the pair of feeds 22. As described above, the elevation sensor unit 8 detects the position of the pair of feeds 22 and is disposed in the motor chamber 12 isolated from the pair of feeds 22. This is advantageous for accurately detecting the position of the pair of feeds 22 and reducing the size of the radome 11.

  FIG. 7 shows a radar device using a rotary drive device according to another embodiment of the present invention. In this figure, the same or similar elements as those in the above embodiment are given the same reference numerals as those in the above embodiment. The rotational drive device A2 of the present embodiment is used as a drive unit of the radar device B2, and a mechanism for driving the outer cylinder shaft 5 and the inner cylinder shaft 4 is different from the above-described rotation drive device A1.

  In this embodiment, the pulley 64 provided on the output shaft 60 of the motor M1 and the pulley 52 of the outer cylinder shaft 5 are connected by a belt (not shown). On the other hand, the pulley 79 provided on the output shaft 70 of the motor M2 and the pulley 42 of the inner cylinder shaft 4 are connected by a belt (not shown).

  In the present embodiment, in order to integrally rotate the pair of Luneberg lenses 21 and the pair of feeds 22 around the azimuth axis Oy, the motors M1 and M2 are synchronously rotated, and the rotational speeds of both are the same. Accordingly, there is no difference between the rotational speed of the outer cylindrical shaft 5 and the rotational speed of the inner cylindrical shaft 4, so that the pair of feeds 22 do not rotate with respect to the pair of Luneberg lenses 21. Next, in addition to rotation around the azimuth axis Oy, in order to rotate the pair of feeds 22 around the elevation axis Ox around the Luneberg lens 21, the rotation speed of the motor M2 is set to the rotation speed of the motor M1. Increase or decrease. That is, when the rotational speed of the motor M2 is relatively increased, the pair of feeds 22 rotates forward around the elevation axis Ox, and when the rotational speed of the motor M2 is relatively decreased, the pair of feeds 22 is moved to the elevation axis Ox. Reverse around. Thus, by controlling the rotation speed of the motor M2 with respect to the rotation speed of the motor M1, the rotation of the pair of feeds 22 around the elevation axis Ox can be controlled.

  Also according to the present embodiment, it is possible to reduce the number of components to be accommodated in the radome 11, and it is possible to achieve both downsizing of the radar device B2 and improvement of observation accuracy. Furthermore, it is easy to improve the scanning speed of the radar device B2. Further, it is possible to suppress a complicated mechanism for driving the outer cylinder shaft 5 and the inner cylinder shaft 4.

  The radar apparatus according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the radar device according to the present invention can be changed in various ways. In the above-described embodiment, the present invention has been described as a weather radar device, but the present invention is not limited to this. For example, the present invention can be applied to an antenna device for communication.

  The present invention can achieve both reduction in size and improvement in operation accuracy, and can be used in various applications such as weather radar.

A1, A2 Rotation drive devices B1, B2 Radar device M1 (first) motor M2 (second) motor Ox Elevation shaft (second central shaft)
Oy azimuth axis (first central axis)
3 Feeding shaft 4 Inner cylinder shaft (second rotating shaft)
5 Outer cylinder shaft (first rotating shaft)
7 Differential Reducer 8 Elevation Sensor Unit 11 Radome 12 Motor Chamber 21 Luneberg Lens (First Driven Body)
22 Feed (second driven body)
23 Bracket 24 Gear 25 Elevation rod (third rotating shaft)
26 Gear 27 Bevel gear 31 Slip ring (Electric power supply)
41 Bevel gear 42 Pulley 51 Support 52 Pulley 60 Output shaft 61 Worm gear 62, 63 Output shaft 64, 65 Pulley 70 Output shaft 71 Input shaft 72 Differential shaft 73 Output shaft 74, 75, 76 Pulley 77 Worm gear 78 Output shaft 79 Pulley 711 715 belt 81 moving body 82 sensor

Claims (12)

Each having an output end and comprising first and second rotating shafts rotating independently of each other;
While driving the first driven body using the rotational driving force of the output end of the first rotating shaft body as a driving source,
A rotary drive device, wherein the second driven body is driven by a rotational driving force generated by a rotational speed difference between output ends of the first and second rotary shaft bodies. The first rotating shaft rotates around a first central axis, and the first and second driven bodies rotate around the first central axis by rotation of the first rotating shaft;
The second driven around a second central axis extending in a radial direction of a cylindrical coordinate system having the first central axis as a central axis according to a rotational speed difference between the first rotary shaft and the second rotary shaft. The rotational drive apparatus of Claim 1 which rotates a body.   The rotary drive device according to claim 2, wherein the second central axis passes through the first driven body. A third rotating shaft supported by the first rotating shaft and disposed in parallel to the second central axis;
The rotary drive device according to claim 3, wherein the second rotary shaft body and the second driven body are connected via the third rotary shaft body.   5. The rotary drive device according to claim 4, wherein one of the first rotating shaft body and the second rotating shaft body has a concentric cross section in which one is inserted into the other.   The rotary drive device according to claim 5, wherein the second rotary shaft body is coupled to the third rotary shaft body via a bevel gear.   The power supply shaft further comprising a rotary connector that is inserted into the first rotary shaft body and the second rotary shaft body and rotates around the first central axis together with the first rotary shaft body. Item 7. The rotational drive device according to Item 5 or 6. A first motor coupled to one of the first rotating shaft body and the second rotating shaft body;
An input shaft coupled to the first motor, an output shaft coupled to one of the first rotating shaft body and the second rotating shaft body, and the rotational speed of the output shaft and the rotational speed of the input shaft; A differential reducer having a differential shaft that causes a difference in
A second motor coupled to the differential shaft of the differential reducer;
The rotation drive device according to claim 1, further comprising:   The rotation drive device according to claim 8, further comprising a rotation amount detection unit that detects a rotation amount of the second motor. A first motor coupled to one of the first rotating shaft body and the second rotating shaft body;
A second motor coupled to the other of the first rotating shaft and the second rotating shaft;
The rotation drive device according to claim 1, further comprising: A rotary drive device according to any one of claims 1 to 10,
A radio wave lens formed using a dielectric so that the relative permittivity changes at a predetermined rate in the radial direction;
A primary radiator arranged in accordance with the focal point of the radio wave lens,
The radio wave lens as the first driven body and the primary radiator as the second driven body are arranged around the azimuth axis by the first rotary shaft body having the first central axis as the azimuth axis as the rotation center. Supported rotatably,
The primary radiator is a radio wave lens antenna apparatus further supported by a rotation axis about a second central axis that is an elevation axis and passes through the center of the radio wave lens. A radome that covers the radio wave lens and the primary radiator;
The radome is fixed and supported on the motor chamber,
The radio wave lens antenna device according to claim 11, wherein the first rotating shaft body is inserted through an opening provided in a partition wall between the radome and the motor chamber.

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