Geared motor drive control mechanism

Abstract

To provide a geared motor drive control mechanism that executes a stopping operation between a start point and an end point of a drive range, maintains the stopping operation, and can execute each operation starting from the stopped state smoothly and reliably without applying any external force other than the drive input of an electric motor.SOLUTION: In a geared motor drive control mechanism, brake means 4 includes a rotating portion 40 including a plurality of permanent magnets 43 and a fixed portion 41 including a plurality of other permanent magnets 45, and one permanent magnet 43 of the rotating portion 40 and the other permanent magnet 45 of the fixed portion 41 are arranged at equal intervals with their polarities aligned in the radial direction centering on a drive shaft 21, and in the driving state of the geared motor, the magnetic coupling between one permanent magnet 43 of the rotating portion 40 and the other permanent magnet 45 of the fixed portion 41 is released, and in the stopped state of the geared motor, the magnetic coupling is formed between one permanent magnet 43 of the rotating portion 40 and the other permanent magnet 45 of the fixed portion 41.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a drive control mechanism for a geared motor that integrates an electric motor and a speed changer and is controlled by a controlled brake means, and more particularly to a drive control mechanism for a geared motor with improved brake means. [Background technology]

[0002] Conventionally, there are many drive control mechanisms for this type of geared motor that perform braking control by magnetic means such as electromagnetic force, or by mechanical means such as a sprocket or belt. Examples of braking control by magnetic means are disclosed in Patent Documents 1 and 2, and examples of braking control by mechanical means are disclosed in Patent Documents 3 and 4.

[0003] The drive control mechanism of the geared motor disclosed in Patent Document 1 is a brake coil. When not in use, the force of the coil spring holds the brake disc in place between the armature and the side plate. When the brake coil is energized, the armature is pressed against the The tube is attracted to the field, allowing the brake disc to rotate freely and releasing the brake. This brake disk is configured such that magnetic teeth are provided on the inner circumference, and the magnetic teeth are spaced apart from each other. The permanent magnets are arranged facing each other through a can and are magnetically coupled. When electricity is applied, the armature is attracted to the field by magnetic attraction, and the brake coil It becomes free to rotate and releases the brake.

[0004] In addition, the drive control mechanism of the geared motor disclosed in Patent Document 2 is a combination of an electromagnetic coil and a compression bar. When the motor is de-energized and not energized, the spring force of the compression spring locks the armature. The rotor is pressed against the armature and clamped between the armature and the fixed plate to perform the brake operation. On the other hand, when the motor is energized, it attracts the armature and separates it from the rotor to apply the brake. This is to release the

[0005] In addition, the drive control mechanism of the geared motor disclosed in Patent Document 3 is a shutter curtain. A ratchet gear formed by a rotating member in which a winding shaft such as a sprocket wheel and a winding shaft are integrated The control is achieved by engaging with the teeth of the gear.

[0006] Furthermore, the drive control mechanism of the geared motor disclosed in Patent Document 4 is A pulley is attached to the drive shaft of the flexible curtain, which is used as a fall prevention device. The control is achieved by contacting a band brake with the rotor.

[0007] Furthermore, the drive control mechanism of the geared motor disclosed in Patent Document 5 is A drive coupling mechanism is provided between the winding shaft and the electric motor, and the winding shaft has an internal cavity. The winding shaft and the motor shaft are connected by the elastic force of the spring. The drive coupling mechanism is configured to couple the winding shaft to the winding shaft. A single shaft is provided, and the first shaft and the fixed belt are connected with the winding shaft in between, The shaft is connected to a winding shaft. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2011-144854 A [Patent Document 2] JP 2007-77719 A [Patent Document 3] JP 2010-189913 A [Patent Document 4] Special Publication No. 2013-500413 [Patent Document 5] JP 2010-24752 A Summary of the Invention [Problem to be solved by the invention]

[0009] Because the drive control mechanisms of conventional geared motors were configured as described above, they all had the problem that unless a control signal or drive force was input from outside, they would stop between the start and end points of the drive range, and it was not possible to maintain this stopped state or to start from this stopped state smoothly and reliably.

[0010] In particular, the drive control mechanism of the geared motor described in Patent Document 1 must supply current to excite the brake coil in addition to the current to drive the electric motor, which results in large current consumption and, particularly at startup, requires an amount of current to generate a magnetic attraction force that resists the force of the coil spring and the magnetic force of the permanent magnet.

[0011] Furthermore, the drive control mechanism for the geared motor described in Patent Document 2, like Patent Document 1, requires a separate current to excite the electromagnetic coil in addition to the drive current of the electric motor, which causes problems such as complicated control operations and increased current consumption.

[0012] Furthermore, the drive control mechanisms of the geared motors described in Patent Documents 3 to 5 all have a problem in that they complicate the mechanical configuration and make it impossible to reduce the manufacturing costs of the device.

[0013] The present invention has been made to solve the above-mentioned problems, and has as its object to provide a drive control mechanism for a geared motor that can smoothly and reliably perform each operation that starts from this stopped state, by slowing down the rotational output of an electric motor in a speed change section and outputting it as a driving force for a geared motor, performing a stopping operation between the start point and the end point of the driving range caused by this driving force, maintaining this stopping operation, and without applying any external force other than the driving input of the electric motor. [Means for solving the problem]

[0014] The drive control mechanism for a geared motor according to the present invention comprises a geared motor formed by integrating an electric motor and a speed change unit whose input shaft is the drive shaft of the electric motor, and a brake means for controlling braking of the output shaft of the speed change unit in each of the driving and stopped states, in which the brake means comprises a rotating part which is rotatably supported on the drive shaft of the electric motor and includes a plurality of first permanent magnets, and a fixed part which is fixed to a case of the electric motor and includes a plurality of other permanent magnets which are arranged opposite to the plurality of first permanent magnets of the rotating part so as to have an opposite polarity in the stopped state, the first permanent magnets of the rotating part and the other permanent magnets of the fixed part are arranged at equal intervals with their polarities aligned in the radial direction around the drive shaft, and when the geared motor is in a driving state, magnetic coupling between the first permanent magnet of the rotating part and the other permanent magnet of the fixed part is released, and when the geared motor is in a stopped state, magnetic coupling is formed between the first permanent magnet of the rotating part and the other permanent magnet of the fixed part.

[0015] As described above, in the present invention, the brake means comprises a rotating part including one permanent magnet and a fixed part including another permanent magnet, and the one permanent magnet of the rotating part and the other permanent magnet of the fixed part are arranged at equal intervals with their polarities aligned in the radial direction, and when the geared motor is in a driving state, the magnetic coupling between the one permanent magnet of the rotating part and the other permanent magnet of the fixed part is released, and when the geared motor is in a stopped state, a magnetic coupling is formed between the one permanent magnet of the rotating part and the other permanent magnet of the fixed part. Therefore, by simply controlling the supply of a drive current to the electric motor, a tangential inertial force corresponding to the rotational speed of the electric motor can be applied to the rotating part, and the attraction and separation between the one permanent magnet of the rotating part and the other permanent magnet of the fixed part, i.e., the release of the magnetic coupling and the formation of the magnetic coupling between the one permanent magnet of the rotating part and the other permanent magnet of the fixed part, can be controlled. This has the effect of executing a stopping operation between the start point and the end point of the driving range by the driving force, maintaining this stopping operation, and smoothly and reliably executing each operation starting from this stopped state, without applying an external force other than the driving input of the electric motor. In addition, the stopping and starting operations of the electric motor can be performed without contact between the rotating part and the fixed part, which has the effect of providing excellent quietness. Furthermore, drive control can be achieved by the drive control force due to the attractive force generated between one permanent magnet of all the rotating parts and another permanent magnet of the fixed part, which are arranged opposite to each other during the stopping operation.

[0016] In the drive control mechanism for a geared motor according to the present invention, one end of the drive shaft of the electric motor serves as the input shaft of a speed change section, and a rotating section of a brake means is disposed on the other end of the drive shaft, as required.

[0017] As described above, in the drive control mechanism of the geared motor according to the present invention, one end of the drive shaft of the electric motor is used as the input shaft of the speed change section, and a rotating section of the brake means is disposed on the other end of the drive shaft. This means that the brake means can drive and control the drive shaft which rotates at high speed and has a small torque output from the electric motor, while controlling the large torque output by the speed change section, which is the output from the geared motor. This has the effect of enabling the smooth and reliable execution of each operation of starting, stopping, and maintaining the stopped state with an as simple mechanical configuration as possible, with the brake means separated from the speed change section.

[0018] In the drive control mechanism for the geared motor according to the present invention, one permanent magnet in the rotating portion and another permanent magnet in the fixed portion are arranged so that adjacent magnets in the circumferential direction have the same polarity, as necessary.

[0019] In this way, in the drive control mechanism of the geared motor of the present invention, one permanent magnet of the rotating part and the other permanent magnet of the fixed part are arranged with adjacent polarities matching in the circumferential direction, so that drive control can be performed by the drive control force due to the attractive force generated between the one permanent magnet of the rotating part and the other permanent magnet of the fixed part that are all arranged opposite each other during the stopping operation, thereby achieving the effect of smoothly and reliably executing and maintaining the stopping operation.

[0020] In the drive control mechanism for the geared motor according to the present invention, one permanent magnet in the rotating portion and another permanent magnet in the fixed portion are arranged with mutually adjacent polarities different in the circumferential direction, as necessary.

[0021] As described above, in the drive control mechanism of the geared motor according to the present invention, the first permanent magnet of the rotating section and the second permanent magnet of the fixed section are arranged with opposite polarities in the circumferential direction, so that drive control can be achieved not only by the drive control force due to the attractive force between the first permanent magnet of the rotating section and the second permanent magnet of the fixed section, which are arranged opposite each other during the stopping operation, but also by the drive control force due to the repulsive force between the first permanent magnet of the rotating section and the second permanent magnet adjacent to the second permanent magnet of the fixed section, thereby enabling the stopping operation to be performed and maintained smoothly and reliably, and further, during the starting operation, when the drive shaft rotates, the repulsive force between the first permanent magnet of the rotating section and the second permanent magnet of the fixed section can be utilized as the rotational force of the drive shaft, thereby providing the effect of enabling the starting operation to be performed smoothly and reliably.

[0022] The drive control mechanism of the geared motor of the present invention is such that, as necessary, the area of ​​each of the magnetic pole faces of one opposing permanent magnet of the rotating part and the other permanent magnet of the fixed part is formed smaller than the area of ​​the magnetic pole face opposite the said magnetic pole face.

[0023] In this way, in the drive control mechanism of the geared motor, the area of ​​each of the magnetic pole faces of one opposing permanent magnet of the rotating part and the other permanent magnet of the fixed part is smaller than the area of ​​the magnetic pole face on the opposite side to the corresponding magnetic pole face. Therefore, the magnetic flux density in the magnetic field on the fixed part side of the one permanent magnet of the rotating part is greater than the magnetic flux density in the magnetic field on the rotating part side of the other permanent magnet of the fixed part. This increases the attractive force acting between the rotating part and the fixed part, thereby achieving the effect of smoothly and reliably performing and maintaining the stopping operation.

[0024] In the drive control mechanism of the geared motor according to the present invention, if necessary, the rotating portion of the brake means is formed by offsetting the central axis of the storage portion that stores one permanent magnet with respect to the radial axis of the drive shaft of the electric motor.

[0025] Thus, in the present invention, in the drive control mechanism of the geared motor, the rotating part of the brake means is formed by offsetting the central axis of the storage section that stores the one permanent magnet with respect to the radial axis of the drive shaft of the electric motor, so that in the stopped state, the one permanent magnet of the rotating part stops in an inclined state with respect to the other permanent magnet of the fixed part, and the magnetic flux distribution between the front and rear ends of the one permanent magnet and the other permanent magnet can be biased toward the front end side of the one permanent magnet, which is the tip side in the rotational direction, resulting in the effect of enabling a smooth and reliable transition from the stopped state to the starting state.

[0026] The drive control mechanism of the geared motor of the present invention is configured, as necessary, so that the rotating part of the brake means has a storage section for storing a permanent magnet in a freely slidable manner, and a gap is formed between the storage section and the left and right radial faces of the permanent magnet.

[0027] Thus, in the present invention, in the drive control mechanism of the geared motor, the rotating part of the brake means is formed so that the storage section that stores the one permanent magnet in a slidable manner has a gap between it and the left and right radial faces of the one permanent magnet. As a result, in accordance with the rotation direction of the drive shaft caused by the driving of the electric motor, the one permanent magnet tilts (falls) in the falling direction within each storage section, and a tapered gap is formed on the front end side of the one permanent magnet. This makes it possible to bias the magnetic flux distribution between the front and rear ends of the one permanent magnet and the other permanent magnet toward the front end side of the one permanent magnet, which is the tip side in the rotation direction, thereby enabling a smooth and reliable transition from a stopped state to a starting state. [Brief description of the drawings]

[0028] [Figure 1] 1 is an overall perspective view of a case in which a drive control mechanism for a geared motor according to a first embodiment is applied to an automatic lifting curtain. FIG. [Diagram 2] 2 is a partial cross-sectional view of a geared motor in the drive control mechanism for the geared motor shown in FIG. 1. [Diagram 3]3 is a partial cross-sectional view of a brake means in the drive control mechanism of the geared motor shown in FIG. 2, and an end view taken along line CC in the partial cross-sectional view. [Figure 4] FIG. 11 is an end view of a brake means in a geared motor according to a second embodiment. [Diagram 5] FIG. 11 is an end view of a brake means in a geared motor according to a third embodiment. [Figure 6] FIG. 11 is a partial cross-sectional view of a geared motor in a drive control mechanism for a geared motor according to a fourth embodiment. [Figure 7] 13A and 13B are end views of a brake means in a geared motor according to a fifth embodiment, and diagrams showing its operation mode. [Figure 8] 13A to 13C are end views of a brake means in a geared motor according to a sixth embodiment, and diagrams showing its operation mode. [Figure 9] FIG. 13 is an end view of a brake means in a geared motor according to a seventh embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an embodiment of the present invention will be described. In addition, the same elements are denoted by the same reference numerals throughout the embodiment.

[0030] (First embodiment) The drive control mechanism for a geared motor according to this embodiment will be described with reference to Figures 1 to 3. Figure 1 is an overall perspective view of the drive control mechanism for a geared motor according to the first embodiment when applied to an automatic lift-up curtain, Figure 2 is a partial cross-sectional view of a geared motor in the drive control mechanism for a geared motor, and Figure 3 is a partial cross-sectional view of a brake means in the drive control mechanism for a geared motor and an end view taken along line CC in the partial cross-sectional view.

[0031] As shown in Figures 1 to 3, the drive control mechanism of the geared motor 1 comprises an electric motor 2 that generates the rotational force required to drive the raising and lowering operation of the rise-and-lower curtain 100, a speed change unit 3 that uses one end 21a of the drive shaft 21 of the electric motor 2 as an input shaft 31 to reduce the speed of the rotational force and generates a torque corresponding to the raising and lowering operation of the rise-and-lower curtain 100 from the output shaft 32 based on this reduced rotational force, and a brake means 4 that is disposed on the other end 21b of the drive shaft 21 of the electric motor 2 and controls braking of the output shaft 32 of the speed change unit 3 in each of the driving and stopped states by opposing one permanent magnet 43 that is journalled on the drive shaft 21 of the electric motor 2 and rotates to another permanent magnet 45 that is fixed to the case 20 of the electric motor 2 so that they have opposite polarities when the electric motor is stopped. The brake means 4 may be provided between the electric motor 2 and the transmission unit 3.

[0032] The brake means 4 comprises a rotating part 40 which is rotatably supported on the drive shaft 21 of the electric motor 2 and which includes one permanent magnet 43 having a rectangular parallelepiped shape, and a fixed part 41 which is disposed on the outside of the rotating part 40 towards the electric motor 2 so as to face the circumferential surface of the rotating part 40 and which includes another permanent magnet 45 having a rectangular parallelepiped shape and which is fixed to the case 20 of the electric motor 2.

[0033] The rotating part 40 is made of a disk-shaped body made of a non-magnetic material, and is provided with a storage part 42 consisting of a plurality of cylindrical recesses arranged radially from the center (drive shaft 21) of the disk-shaped body at equal intervals (90° each), and a rectangular parallelepiped permanent magnet 43 (43a to 43d) built into and fixed to the storage part 42. The polarities of the permanent magnets 43a to 43d are aligned in the radial direction centered on the drive shaft 21, and the polarities adjacent to each other in the circumferential direction on the fixed part 41 side are all the same polarity (for example, N pole). The rotating portion 40 is supported at the center of a disk-shaped body by the drive shaft 21 of the electric motor 2 and is fixed so as to rotate in conjunction with the rotation of the drive shaft 21.

[0034] The fixed part 41 has a doughnut shape made of a non-magnetic material concentric with the rotating part 40 centered on the drive shaft 21, and includes a storage part 44 consisting of a plurality of cylindrical recesses arranged at equal intervals (90° each) radially from the center, and other permanent magnets 45 (45a to 45d) of a rectangular parallelepiped shape built into and fixed to the storage part 44. The other permanent magnets 45a to 45d are arranged such that the polarities are aligned in the radial direction centered on the drive shaft 21, and adjacent polarities in the circumferential direction on the rotating part 40 side are all the same polarity and are opposite polarity (for example, S pole) to one of the permanent magnets 43a to 43d of the opposing rotating part 40. The fixed portion 41 is fixed to one end surface 20a of the case of the electric motor 2.

[0035] The rotating part 40 and the fixed part 41 are always in a non-contact state with a gap therebetween, regardless of whether the electric motor 2 is in operation (driven or stopped).

[0036] 3 shows an example in which four permanent magnets 43a-43d, 45a-45d are arranged in each of the rotating part 40 and the fixed part 41, but an odd number of permanent magnets such as three or an even number of permanent magnets such as eight may be arranged in each of the rotating part 40 and the fixed part 41, and the number of permanent magnets is not particularly limited. However, from the viewpoint of suppressing noise caused by vibration of the permanent magnets 43a-43d, 45a-45d due to attraction between the permanent magnets 43a-43d, 45a-45d in the rotating part 40 and the fixed part 41, the magnetic force of each permanent magnet 43a-43d, 45a-45d may be weakened and the number of permanent magnets may be increased. Therefore, as the permanent magnets 43a-43d, 45a-45d in this embodiment, not only sintered magnets such as neodymium magnets but also plastic magnets with weaker magnetic force may be used.

[0037] The number of permanent magnets installed may also be different between the rotating part 40 and the fixed part 41. For example, it is possible to install four permanent magnets in the rotating part 40 and eight permanent magnets in the fixed part 41.

[0038] Furthermore, although the permanent magnets 43a to 43d and 45a to 45d are shown as having a rectangular parallelepiped shape, the shape is not particularly limited as long as opposite polarities are opposed between the rotating part 40 and the fixed part 41 during stopping operation, and the shape may be a rectangular prism with a trapezoidal base, a sphere, or the like.

[0039] Next, a control operation for automatically operating the lift-and-lower curtain 100 using the drive control mechanism of the geared motor 1 according to this embodiment will be described. First, a control operation for automatically operating the lift-up curtain 100 will be described.

[0040] First, when the lift-up curtain 100 is in an open state, the lower end 103 of the curtain is located at the top 100H of the driving range W, no current is supplied to the electric motor 2 and it is in a stopped state, and one of the permanent magnets 43a-43d in the rotating part 40 of the brake means 4 is attracted by the magnetic field of the other permanent magnets 45a-45d in the fixed part 41, preventing the electric motor 2 from rotating and maintaining the lift-up curtain 100 in an open state.

[0041] When the lower end 103 of the lift-up curtain 100 in the open state is located at the top 100H of the driving range W, and the driving control unit 200 issues a command to perform a shielding operation, a driving current is supplied from a power supply unit (not shown) to the electric motor 2. This supply of driving current causes the electric motor 2 to start rotating, generating a tangential inertial force in the rotating unit 40 which rotates together with the driving shaft 21 of the electric motor 2, thereby releasing the other permanent magnets 45a-45d of the fixed unit 41 from their tensioned state, and releasing the brake state provided by the brake means 4.

[0042] Releasing the brake state of this braking means 4 frees the drive shaft 21 of the electric motor 2, and the driving rotation of the electric motor 2 is input from the input shaft 31 via the drive shaft 21, and this input rotational force is decelerated by the speed change unit 3 and converted into the torque required for the raising and lowering operation of the rise-and-lower curtain 100. This converted rotational force rotates the lift-and-lower shaft 102 of the rise-and-lower curtain 100, and unrolls the curtain 101 to provide shading.

[0043] If, during this shielding operation, the drive control unit 200 issues an instruction to stop the curtain 101 at the middle portion 100M and maintain the semi-shielding state of the curtain 101, the current supply from the power supply unit (not shown) to the electric motor 2 is cut off, the rotational speed of the electric motor 2 is attenuated, and the tangential inertial force generated in the brake means 4 is also rapidly reduced, so that the brake of the brake means 4 functions due to the attractive force between the permanent magnets 43a to 43d, 45a to 45d.

[0044] When the brake of this braking means 4 functions, the lower end portion 103 of the curtain remains stopped at the middle portion 100M, so that the rise-and-fall curtain 100 can be in a semi-shielding state.

[0045] Furthermore, when the drive control unit 200 issues an instruction to transition from this semi-shielded state to a fully shielded state, the power supply unit (not shown) starts to supply current to the electric motor 2, and the drive is controlled to the bottom 100L in the same manner as the starting operation from the top 100H of the driving range W.

[0046] The above has described the shielding operation of the lift-up curtain 100 from the top 100H of the driving range W to the middle section 100M, and from this middle section 100M to the bottom section 100L. However, the opening operation from the bottom section 100L of the driving range W to the middle section 100M, and from this middle section 100M to the top section 100H can also be executed and controlled in a similar manner.

[0047] The relationship between the driving torque F1 of the electric motor 2, the driving torque F2 for winding (or unwinding) the lift-and-fall curtain 100, and the attractive force F3 between the rotating part 40 and the fixed part 41 of the brake means 4 can be expressed by the following equation.

[0048] F1>F3>F2

[0049] As long as the relationship between drive torque F1, drive torque F2, and attractive force F3 is maintained, the drive control mechanism of the geared motor 1 in this embodiment can control any opening and closing operations within the drive range W of the lift-up curtain 100 simply by ON / OFF control of the supply current to the electric motor 2 from the drive control unit 200.

[0050] Second Embodiment The drive control mechanism of the geared motor according to this embodiment will be described with reference to Fig. 4. Fig. 4 is an end view of the brake means in the geared motor according to the second embodiment. In this embodiment, explanations that overlap with those in the first embodiment will be omitted.

[0051] In the rotating portion 40 of the braking means 5, each permanent magnet 53a-53d is arranged in the storage portion 42 such that the polarities are aligned radially around the drive shaft 21 and adjacent polarities in the circumferential direction on the radially outer side of the fixed portion 41 are alternately different. Similarly, in the fixed portion 41, the other permanent magnets 55a to 55d are arranged in the storage portion 44 with their polarities aligned radially around the drive shaft 21, and with adjacent polarities alternating in the circumferential direction on the radially inner side of the rotating portion 40.

[0052] With the above configuration, the stopping operation can be smoothly and reliably performed and maintained not only by the drive control force due to the attractive force between the polarity (e.g., N pole) of one permanent magnet 53a of the rotating part 40 and the polarity (e.g., S pole) of the other permanent magnet 55a of the fixed part 41, which are arranged opposite each other during the stopping operation, but also by the drive control force due to the repulsive force between the N pole of one permanent magnet 53a of the rotating part 40 and the N pole of the other permanent magnet 55b on the rotating part 40 side adjacent to the other permanent magnet 55a of the fixed part 41 (here, the rotation direction of the drive shaft 21 is clockwise (rotation direction X)). In addition, during the starting operation, for example, the repulsive force between the N pole of one permanent magnet 53a of the rotating part 40 and the N pole of another permanent magnet 55a of the fixed part 41 can be used as the rotational force of the drive shaft, thereby enabling the starting operation to be carried out smoothly and reliably.

[0053] In this embodiment, from the viewpoint of the stopping position accuracy during the stopping operation, it is preferable to arrange an even number of permanent magnets so that the polarity of one permanent magnet 53a-53d on the rotating part 40 on the fixed part 41 side and the polarity of the other permanent magnets 55a-55d on the fixed part 41 on the rotating part 40 side are alternated, but it is also acceptable to arrange the number of permanent magnets arranged in the rotating part 40 and the fixed part 41 to be an odd number, so that there are some parts where adjacent polarities are the same.

[0054] (Third embodiment) The drive control mechanism of the geared motor according to this embodiment will be described with reference to Fig. 5. Fig. 5 is an end view of a brake means in a geared motor according to a third embodiment. In this embodiment, explanations that overlap with the above-described embodiments will be omitted.

[0055] Each of the permanent magnets 63a to 63d of the rotating part 40 in the brake means 6 has a rectangular prism shape with the bottom surface facing the drive shaft 21 direction being an isosceles trapezoid, and a surface 66 including the upper base and a surface 67 including the lower base are each a magnetic pole surface, and these magnetic pole surfaces 66, 67 are arranged in the storage section 62 so as to be aligned radially around the drive shaft 21. The area of ​​pole surface 66 including the upper base on the side of fixed portion 41 facing the other permanent magnets 65a to 65d is smaller than the area of ​​pole surface 67 including the lower base on the opposite side (radially inner side).

[0056] Similarly, the other permanent magnets 65a to 65d of the fixed portion 41 have a rectangular prism shape with the bottom surface facing the drive shaft 21 direction being an isosceles trapezoid, and a surface 68 including the upper base and a surface 69 including the lower base are magnetic pole surfaces, and these magnetic pole surfaces 68, 69 are arranged in the storage portion 64 so as to be aligned radially around the drive shaft 21. The area of ​​a magnetic pole surface 69 including the lower base of the rotating part 40 facing one of the permanent magnets 63a to 63d is smaller than the area of ​​a magnetic pole surface 68 including the upper base on the opposite side (radially outer side).

[0057] As a result, in one of the permanent magnets 63a to 63d of the rotating part 40, the magnetic field becomes stronger due to the increased magnetic flux density of the magnetic pole face 66 including the upper base on the fixed part 41 side, and in the other permanent magnets 65a to 65d of the fixed part 41, the magnetic field becomes stronger due to the increased magnetic flux density of the magnetic pole face 69 including the lower base on the rotating part 40 side.This makes it possible to increase the attractive force acting between the rotating part 40 and the fixed part 41, and to smoothly and reliably perform and maintain the stopping operation.

[0058] In the above description, the permanent magnets 63a-63d, 65a-65d of the rotating part 40 and the fixed part 41 are both rectangular prisms with an isosceles trapezoidal bottom, but only one of the permanent magnets may be rectangular prism-shaped. The shapes of the permanent magnets 63a-63d, 65a-65d of the rotating part 40 and the fixed part 41 are not limited to rectangular prisms with an isosceles trapezoidal bottom, and may be any shape as long as the area of ​​the magnetic pole faces on the opposing sides of the permanent magnets 63a-63d, 65a-65d of the rotating part 40 and the fixed part 41 is smaller than the area of ​​the magnetic pole faces on the opposite sides, and the magnetic field of the opposing magnetic pole faces is stronger. Furthermore, for example, in the case of a rectangular parallelepiped permanent magnet, when magnetizing an unmagnetized magnetic material formed as a compact in the manufacturing stage of the permanent magnet, the magnetic flux density in the magnetic field of the pole faces on the sides where the permanent magnets of the rotating part 40 and the fixed part 41 face each other may be increased by controlling the arrangement, strength, etc. of the pulse magnetic field.

[0059] (Fourth embodiment) The drive control mechanism for the geared motor according to this embodiment will be described with reference to Fig. 6. Fig. 6 is a partial cross-sectional view of a geared motor in a drive control mechanism for a geared motor according to a fourth embodiment. In this embodiment, explanations that overlap with the above-described embodiments will be omitted.

[0060] The brake means 7 comprises a rotating part 70 which is rotatably supported on the drive shaft 21 of the electric motor 2 and includes one permanent magnet 74 having a rectangular parallelepiped shape, and a fixed part 71 which is disposed on the inside of the rotating part 70 toward the electric motor 2 so as to face the circumferential surface of the rotating part 70 and is fixed to the case 20 of the electric motor 2 and includes another permanent magnet 76 having a rectangular parallelepiped shape.

[0061] The rotating part 70 is made of a substantially disk-shaped body made of a non-magnetic material, and is provided with a storage section 73 consisting of a plurality of cylindrical recesses disposed radially at equal intervals (90° each) from the center (drive shaft 21) of this disk-shaped body and disposed on the outside closer to the electric motor 2 side than the disk part 72, and a single permanent magnet 74 having a rectangular parallelepiped shape that is built into and fixed to the storage section 73. The single permanent magnet 74 is arranged such that the polarities are aligned in the radial direction around the drive shaft 21, and that adjacent polarities in the circumferential direction on the fixed part 71 side are all the same polarity (for example, N pole).

[0062] The fixed portion 71 is made of a doughnut shape made of a non-magnetic material and fixed to the protruding portion 20b of the electric motor 2, and is provided with a storage portion 75 consisting of a plurality of cylindrical recesses arranged radially at equal intervals (90° each) from the center of this doughnut shape (the drive shaft 21), and another permanent magnet 76 having a rectangular parallelepiped shape that is built into and fixed to the storage portion 75. The other permanent magnets 76 are arranged such that their polarities are aligned in the radial direction centered on the drive shaft 21, and that adjacent polarities in the circumferential direction on the rotating portion 70 side are all the same polarity and are opposite polarity (for example, S pole) to one permanent magnet 74 of the opposing rotating portion 70.

[0063] In the drive control mechanism for the geared motor 1 of this embodiment, as in the drive control mechanism for the geared motor 1 of the first embodiment described above, the rotational output of the electric motor 2 is decelerated by the transmission section 3 and output as the drive force of the geared motor 1, a stopping operation is performed between the start point and the end point of the drive range by this drive force, this stopping operation is maintained, and each operation starting from this stopped state can be performed smoothly and reliably without applying any external force other than the drive input of the electric motor 2.

[0064] Fifth embodiment The drive control mechanism of the geared motor of this embodiment will be described with reference to Fig. 7. Fig. 7 is an end view of a brake means in a geared motor according to a fifth embodiment, and a diagram showing its operation. In this embodiment, explanations that overlap with the above-described embodiments will be omitted.

[0065] The brake means 8 all have a common configuration in which one permanent magnet 43 is built into each storage section 81 of the rotating section 40, and the fixed section 41 including the other permanent magnets 45 is arranged concentrically with the rotating section 40, and the central axis (planar arrangement) of the one permanent magnet 43 and each of its storage sections 81 is arranged with a slight deviation α from the radial axis centered on the drive shaft 21 of the electric motor 2.

[0066] Due to this unique configuration in which the one permanent magnet 43 of the rotating part 40 and each of the storage parts 81 are offset from the radial axis, as shown in FIG. 7(B), in the stopped state, the one permanent magnet 43 stops in an inclined state relative to the other permanent magnets 45 of the fixed part 41, and the magnetic flux distribution between the front end part 43e and the rear end part 43f of the one permanent magnet 43 and the other permanent magnets 45 can be biased toward the front end part 43e of the one permanent magnet 43, which is on the tip side in the rotation direction X, thereby enabling a smooth and reliable transition from the stopped state to the starting state.

[0067] Sixth embodiment The drive control mechanism of the geared motor of this embodiment will be described with reference to Fig. 8. Fig. 8 is an end view of a brake means in a geared motor according to a sixth embodiment, and a diagram showing its operation. In this embodiment, explanations that overlap with the above-described embodiments will be omitted.

[0068] The brake means 9 have in common a configuration in which one permanent magnet 43 is built into each storage section 91 of the rotating part 40 so that it can slide freely, and a fixed part 41 including another permanent magnet 45 is arranged concentrically with the rotating part 40, and gaps 91a, 91b are formed between each storage section 91 of the rotating part 40 and the left and right surfaces of the one permanent magnet 43 on the radial direction side.

[0069] Since the one permanent magnet 43 is stored in the storage portions 91 by forming gaps 91a, 91b between the one permanent magnet 43 and each storage portion 91 in this manner, as shown in FIG. 8(B), in accordance with the rotation direction X of the drive shaft 21 driven by the electric motor 2, the one permanent magnet 43 tilts (falls) in the falling direction Y within each storage portion 91, and the magnetic flux distribution between the front end portion 43e and the rear end portion 43f of the one permanent magnet 43 and the other permanent magnets 45 can be biased toward the front end portion 43e of the one permanent magnet 43, which is on the tip side in the rotation direction X, thereby enabling a smooth and reliable transition from a stopped state to a starting state.

[0070] Alternatively, a protrusion may be provided on the surface of the storage portion 91 opposite to the fixed portion 45 with which the one permanent magnet 43 abuts, and the one permanent magnet 43 may be inclined with the protrusion as a starting point. Furthermore, although each storage section 91 is roughly rectangular in shape, if at least a portion of the surface opposite the fixed section 45 is tapered or curved, the inclination of one permanent magnet 43 can be more effectively promoted.

[0071] Seventh embodiment The drive control mechanism of the geared motor of this embodiment will be described with reference to Fig. 9. Fig. 9 is an end view of a brake means in a geared motor according to a seventh embodiment. In this embodiment, explanations that overlap with the above-described embodiments will be omitted.

[0072] In the rotating portion 40 of the braking means 10, each permanent magnet 203a to 203f is arranged in the storage portion 42 such that the polarities are aligned radially around the drive shaft 21 and adjacent polarities in the circumferential direction on the fixed portion 41 side all have the same polarity (e.g., N pole). In the fixed portion 41, the other permanent magnets 205a-205f are arranged in the storage portion 44 such that their polarities are aligned radially around the drive shaft 21, their magnetic poles on the rotating portion 40 side have the same polarity as one of the permanent magnets 203a-203f of the opposing rotating portion 40, and adjacent polarities in the circumferential direction on the radially inner side of the rotating portion 40 side all have the same polarity (e.g., N pole).

[0073] In the drive control mechanism of the geared motor 1 according to this embodiment, the one permanent magnet 203a-203f of the rotating part 40 stops at a position where the repulsive forces it receives from the magnetic fields generated by the other permanent magnets 205a-205f of the opposing fixed part 41 are balanced. For example, in the example shown in Fig. 9, the one permanent magnet 203a of the rotating part 40 stops at a circumferential intermediate position between the other permanent magnets 205a and 205b of the fixed part 41.

[0074] In this way, the driving of the geared motor 1 can be stopped by utilizing the repulsive force acting between one of the permanent magnets 203a-203f of the rotating part 40 and the other permanent magnets 205a-205f of the fixed part 41, so that the stopping operation can be performed and maintained smoothly and reliably. In particular, since one of the permanent magnets 203a-203f of the rotating part 40 is stopped at a position where the repulsive forces it receives from the magnetic fields created by the other permanent magnets 205a-205f of the fixed part 41 are balanced, i.e., at a position where it is less affected by the magnetic fields of the other permanent magnets 205a-205f, the starting operation of the geared motor 1 can be performed smoothly.

[0075] In the above, the number of magnetic poles of the permanent magnets in the rotating part 40 and the fixed part 41 is six, but this is not limiting. For example, more permanent magnets may be installed to make the stopping operation of the geared motor 1 smoother and more reliable, and the number of permanent magnets installed is appropriately set taking into consideration the strength of the magnetic field of the permanent magnets, smooth start and stop, etc.

[0076] In the above embodiments, the rotating part is described as being supported at a fixed position on the drive shaft, but the rotating part may have a sliding function so that the rotating part can slide along the drive shaft in a direction away from the other permanent magnet of the fixed part when the geared motor is in a starting state. In this way, the rotating part moves away from the fixed part as the drive shaft rotates, and the area of ​​the opposing (overlapping) magnetic pole faces of one permanent magnet of the rotating part and the other permanent magnet of the fixed part gradually decreases, i.e., the attractive force acting between the rotating part and the fixed part becomes smaller, allowing the drive shaft to rotate smoothly at an earlier stage.

[0077] In addition, when a magnetic encoder is provided in the geared motor, one of the permanent magnets in the rotating part may be used as a permanent magnet for the magnetic encoder. In this case, the magnetic pole face of the one permanent magnet in the rotating part in the first embodiment is extended in the drive shaft direction beyond the magnetic pole face of the other permanent magnet in the fixed part, and this extended magnetic pole face portion faces the Hall element.

[0078] Furthermore, in each of the above embodiments, the drive control mechanism for the geared motor according to the present invention has been described as being applied to an automatic raising and lowering curtain, but it may also be applied to other opening and closing devices for openings, such as automatic shutters and automatic screens.

[0079] Furthermore, the configurations shown in the above-described embodiments can be applied in appropriate combinations. [Explanation of symbols]

[0080] 1 Geared motor 2 Electric motor 3. Gear shifting section 4~10 Braking means 20 cases 20a One end face 20b Protrusion 21 Drive shaft 21a One end side 21b Other end side 31 Input shaft 32 Output shaft 40, 70 Rotating section 41, 71 Fixed part 42, 44, 62, 64, 73, 75, 81, 91 Storage area 43, 43a-43d, 53a-53d, 63a-63d, 74, 203a-203f One permanent magnet 43e Front end 43f Rear end 45, 45a~45d, 55a~55d, 65a~65d, 76, 205a~205f Other permanent magnets 66~69 Magnetic pole face 91a, 91b gap 100 Lifting Curtain 100H Top 100L bottom 100M middle part 101 Curtains 102 Elevation shaft 103 Bottom of curtain W Driving range X Rotation Direction Y Fall direction α deviation

Claims

1. A drive control mechanism for a geared motor includes a geared motor formed by integrating an electric motor and a speed change unit whose input shaft is a drive shaft of the electric motor, and a brake means for controlling braking of an output shaft of the speed change unit in each of a drive state and a stop state, the brake means comprises: a rotating section rotatably supported on a drive shaft of the electric motor and including a plurality of one permanent magnet; and a fixed section fixed to a case of the electric motor and including a plurality of other permanent magnets disposed to face the plurality of one permanent magnets of the rotating section so as to have an opposite polarity in the stopped state, The one permanent magnet of the rotating section and the other permanent magnet of the fixed section are arranged at equal intervals with two different polarities aligned in a radial direction around the drive shaft, and are arranged with adjacent polarities aligned in a circumferential direction, A drive control mechanism for a geared motor, characterized in that when the geared motor is in a driving state, magnetic coupling between one permanent magnet of the rotating section and another permanent magnet of the fixed section is released, and when the geared motor is in a stopped state, magnetic coupling is formed between the one permanent magnet of the rotating section and the other permanent magnet of the fixed section.

2. 2. The drive control mechanism for a geared motor according to claim 1, A drive control mechanism for a geared motor, characterized in that one end of a drive shaft of the electric motor serves as an input shaft of the speed change section, and a rotating section of the brake means is disposed on the other end of the drive shaft.

3. 3. The drive control mechanism for a geared motor according to claim 1, A drive control mechanism for a geared motor, characterized in that the area of ​​each magnetic pole face of one opposing permanent magnet of the rotating part and another permanent magnet of the fixed part is smaller than the area of ​​the magnetic pole face opposite the said magnetic pole face.

4. The drive control mechanism for a geared motor according to any one of claims 1 to 3, A drive control mechanism for a geared motor, characterized in that the rotating portion of the brake means is formed by offsetting the central axis of a storage portion that stores the one permanent magnet with respect to the radial axis of the drive shaft of the electric motor.

5. The drive control mechanism for a geared motor according to any one of claims 1 to 4, A drive control mechanism for a geared motor, characterized in that the rotating part of the brake means has a storage section for slidably storing the one permanent magnet, the storage section being formed so as to have a gap between the left and right radial surfaces of the one permanent magnet.

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