JP5096178B2 - Electric motor with electromagnetic brake - Google Patents

Description

The present invention relates to an electric motor with an electromagnetic brake and a brake releasing method thereof.
For example, the present invention relates to an electric motor with an electromagnetic brake that rotationally drives a winding shaft on which a long object such as a shutter, a blind, or a curtain is wound.

  There has been proposed an electric winding device in which a winding shaft on which a long object such as a shutter, a blind, or a curtain is wound is driven to rotate by an electric motor. An example of the electric winding device will be described. An electric motor is provided on one end side of the cylindrical winding shaft, and the winding shaft is driven to rotate via a clutch mechanism connected to the rotor shaft (output shaft). It has become.

  In the case of the electric shutter device, when the motor stops rotating, it is necessary to stop the shutter at that position. Therefore, the motor is provided with an electromagnetic brake. A sliding brake is used as the electromagnetic brake. For example, a brake coil and a movable iron plate provided concentrically with the rotor shaft of the electric motor are energized so as to be constantly pressed against a brake lining supported by a support plate fixed to the rotor shaft end side. The rotation of the rotor shaft is regulated by friction, and the motor is braked. Further, when the brake coil is energized, the mover iron plate is attracted to the brake coil side and moves away from the brake lining in the axial direction, so that the support plate can be rotated together with the rotor shaft, and the brake of the motor is It is canceled (see Patent Document 1).

An engagement type electromagnetic brake is also used as another example of the brake unit. The configuration in which the electromagnetic brake is provided at one end of the rotor shaft of the electric motor is the same as the sliding type, but the first disk provided with the first teeth at a predetermined interval in the circumferential direction is integrated with the mover. And a second disk provided with second teeth at predetermined intervals in the circumferential direction on the opposing surface of the first disk is fixed to the rotor shaft end. The first disk is always urged toward the second disk, and the rotation of the rotor shaft is regulated by engaging the first teeth with the second teeth, and the motor is braked. When starting the electric motor, if the brake coil is energized and the mover is attracted, the first disc is separated from the second disc in the axial direction and disengaged, so that the brake is released. ing.
JP 2002-51498 A

  In the electric motor with an electromagnetic brake provided in the above-described electric winding device, when a sliding brake is used, a fluctuation in rotational torque by an assist spring according to the winding position of the shutter (for example, the shutter is wound up at the upper position) Because the external force (rotational force) acting on the rotor shaft fluctuates, for example, it changes to stop at the position), the necessary holding torque for holding the shutter at the stop position cannot be obtained and it is expensive. There was a problem.

Further, when the mesh brake is used, the rotation is restricted in a state where the first teeth and the second teeth mesh with each other and the side surfaces in the circumferential direction are in contact with each other. It is necessary to overcome the contact friction force and suck the mover.
Therefore, in order to release the brake state of the electromagnetic brake, it is necessary to increase the energization amount to be applied to the brake coil to increase the attracting force of the mover. Therefore, there is a possibility that the brake size increases and the power consumption increases.
There is also a need to increase the commercial value by reducing the noise generated when starting up the motor and the noise generated when releasing the brake.

  An object of the present invention is to provide an electric motor with an electromagnetic brake that can reliably engage with a brake with a small suction force and that is small in size and can realize low power consumption and low noise.

In order to achieve the above object, the present invention comprises the following arrangement.
A motor, a rotor shaft extending from the motor body, an electromagnetic brake having a movable element and a brake coil concentrically arranged around the extended rotor axis, and a shaft end of the movable element A first brake disk having first teeth formed at predetermined intervals in the circumferential direction, and a first brake disk that is integrally assembled to the rotor shaft so as to face the first brake disk, and second at predetermined intervals in the circumferential direction. When the electric motor is stopped, the first brake disc is always pressed against the second brake disc to engage the rotation of the electric motor and the brake is applied. A control unit that controls driving of the motor after releasing the engagement brake when starting the motor, and the control unit releases the engagement brake when starting the motor. Engages the brake by parallel rotation of the second brake disc at least in the clockwise direction (CW) and counterclockwise direction (CCW), characterized in that it is released.
Here, “in parallel” means that two or more operations are performed regardless of the timing of the operation start. Specifically, the meshing brake releasing operation and the rotating operation of the second brake disk in the clockwise direction (CW) and the counterclockwise direction (CCW) may be performed simultaneously, or the second brake disc may be operated while performing the meshing brake releasing operation. The brake disk may be rotated clockwise (CW) and counterclockwise (CCW) , or the second brake disk may be rotated clockwise (CW) and counterclockwise (CCW). The meshing brake releasing operation may be performed while performing the rotating operation.

Further, the control unit when starting the motor, characterized in that the engagement brake by rotating a predetermined amount the motor to C W-CCW-CW direction or CCW-CW-CCW direction is released.

  In addition, a stepping motor is used as the electric motor, and when the electric motor is started, the control unit rotates the second brake disk in a predetermined direction by a predetermined amount by a microstep driving method.

  As another means, an electric motor, an electromagnetic brake in which a rotor shaft is extended from the electric motor body, and a mover and a brake coil are arranged concentrically around the extended rotor shaft, and the movable A first brake disk provided at a shaft end portion of the child and having first teeth formed at predetermined intervals in the circumferential direction; and a first brake disk opposed to the first brake disk and integrally assembled with the rotor shaft; A second brake disk having second teeth formed in the direction at predetermined intervals, a rotation detection unit for detecting the rotation direction of the rotor shaft, and the first brake disk is always in the first state when the motor is stopped. A brake that is pressed against the brake disc of No. 2 and engaged with the rotation of the electric motor, and includes a control unit that releases the engagement brake when the electric motor is started to drive and control the electric motor, When the motor is started, the control unit engages with the engagement brake by releasing the engagement brake release operation and the rotation operation of the second brake disk in the opposite direction to the rotation direction detected immediately before the rotation is detected by the rotation detection unit. Is released.

  The control unit may release the mesh brake while rotating the second brake disk by a predetermined amount in a direction opposite to the rotation direction detected immediately before the stop by the rotation detection unit when starting the electric motor. To do.

  In addition, a stepping motor is used for the electric motor, and when the electric motor is started, the control unit rotates the second brake disk by a predetermined amount by a microstep driving method.

If the above-described electric motor with an electromagnetic brake is used, the first brake disc is always pressed against the second brake disc while the electric motor is stopped, and the first and second teeth are engaged with each other, so that the rotation of the electric motor is performed. Since the meshing brake is applied, a sufficient holding torque can be obtained even if the external force acting on the rotor shaft fluctuates.
Further, when starting the electric motor, the control unit releases the meshing brake by performing the meshing brake releasing operation and the rotation operation of the second brake disk in a predetermined direction in parallel. Thus, when the motor is started, the second brake disk is rotated to a position where the contact frictional force between the side surfaces in the rotational direction of the first and second teeth is not affected by the external force acting on the rotor shaft. The mesh brake can be released. Therefore, the brake can be released with a small attractive force of the mover, and the electromagnetic brake can be reduced in size and reduced in power consumption.

  In particular, when the control unit starts the motor, the control unit moves the motor in a predetermined amount in at least the clockwise direction (CW) and the counterclockwise direction (CCW), more preferably in the CW-CCW-CW direction or the CCW-CW-CCW direction. The meshing brake is released by rotating. Due to the rotating operation of the electric motor, even if the first and second teeth of the first and second brake discs are in any meshing state, the rotational side surfaces of the first and second teeth are not in contact with each other. The second brake disc can be rotated to the position.

  In addition, since a stepping motor is used as the electric motor, the initial torque is high, and the controllability in the low-speed rotation range at the start is good. Further, when starting the motor, the control unit rotates the second brake disk by a predetermined amount in a predetermined direction by microstep driving instead of the normal driving method by 1-2 phase excitation. Compared with the drive system, high-definition rotation control with high resolution can be performed, and operation noise when starting the motor can be suppressed.

In addition, a rotation detection unit for detecting the rotation direction of the rotor shaft is provided, and the control unit releases the meshing brake release operation and the rotation of the second brake disk in the direction opposite to the rotation direction detected immediately before stopping by the rotation detection unit. The meshing brake is released by operating in parallel. Thereby, the drive sequence of the electric motor for releasing the electromagnetic brake can be simplified.
Further, when starting the electric motor, the control unit releases the meshing brake by releasing the meshing brake while rotating the second brake disk by a predetermined amount in the direction opposite to the rotational direction detected immediately before the stop by the rotation detection unit. Energy saving can be achieved by shortening the energization time for release.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best embodiment of an electric motor with electromagnetic brake according to the present invention will be described with reference to the attached drawings. Below, the electric motor with an electromagnetic brake provided in the electric winding device for shutters will be described as an example. As an example of the electric winding device, a tubular type device is used. That is, in FIG. 1, an electric motor with an electromagnetic brake is used in which an electromagnetic brake 2 is integrally assembled on a side surface of an electric motor (for example, a stepping motor) 1 as a drive source in a housing portion provided coaxially with a winding shaft (not shown). The driving force of the electric motor 1 is transmitted to the take-up shaft through the clutch mechanism 3, and the electric motor 1 with an electromagnetic brake is rotated by the control unit (control circuit tower) 4. And the brake operation of the electromagnetic brake 2 is controlled. When the electromagnetic brake 2 of the electric motor with electromagnetic brake is released and the electric motor 1 is started, the winding shaft is driven to rotate through the clutch mechanism 3. Although it is an option, a rotation detector (encoder) 21 for detecting the rotation direction of the rotor shaft is provided between the electric motor 1 and the clutch mechanism 3. The control unit 4 stores the rotation direction of the rotor shaft detected immediately before the electric motor 1 is stopped by the encoder 21.
The electric motor is not particularly limited, but a position control motor (stepping motor, hybrid stepping motor, etc.) having a high initial torque (torque in the low speed rotation range) is preferable.

  First, with reference to FIG. 2, a schematic configuration of an electric motor with an electromagnetic brake will be described. A rotor shaft 6 extends from an axial side surface (bracket side surface) 5 a of the electric motor body 5, and the electromagnetic brake 2 is assembled integrally with the extended rotor shaft 6. A mover 7 made of a metal magnetic material is fitted around the rotor shaft 6 so as to be movable in the axial direction, and a stator 8 is disposed concentrically around the mover 7.

  In FIG. 2, the configuration of the stator 8 will be described. A back yoke 9 is assembled on the axial side surface 5 a of the electric motor body 5. The back yoke 9 is integrally assembled with a cup-shaped yoke 10 having a through hole 10a at the bottom. A resin coil bobbin 11 is assembled to the back yoke 9 concentrically with the rotor shaft 6. A brake coil 12 is wound around the recessed groove portion of the coil bobbin 11. The coil bobbin 11 is assembled integrally with the back yoke 9 and stored in the yoke 10.

  In FIG. 2, a first brake disk 13 is provided on the outer end of the mover 7 in the axial direction. In FIG. 3A, first teeth 14 are radially formed at predetermined intervals in the circumferential direction on the brake acting surface of the first brake disc 13. In the present embodiment, the first brake disk 13 having the number of teeth N = 12 teeth, the tooth gap width (tooth gap) P = 20 °, and the tooth thickness angle A = 10 ° is used.

  3 (b) and 3 (c), the mover 7 is provided with a first brake disk 13 and a small-diameter cylindrical mover main body 15 continuous thereto. A concave portion 13 a to which the return spring 20 is pressed is provided on the opposite surface of the first brake disc 13 from the brake acting surface. Further, a protrusion 15 a is provided on the outer peripheral surface of the mover main body 15 in the longitudinal direction. The protrusion 15a is prevented from rotating in a state where the protrusion 15a is fitted in a concave groove (not shown) provided in the shaft hole 11a of the coil bobbin 11 of FIG. Therefore, even when the brake coil 12 is energized, the mover 7 is assembled so as to move only in the axial direction without rotating around the rotor shaft 6.

  In FIG. 2, a second brake disk 16 is integrally assembled with a screw 17 at the shaft end of the rotor shaft 6. The second brake disc 16 is disposed opposite to the first brake disc 13. In FIG. 4C, the second teeth 18 are radially formed at predetermined intervals in the circumferential direction on the brake acting surface (opposing surface) of the second brake disc 16. In the present embodiment, the second brake disk 16 having the number of teeth N = 12 teeth, the tooth gap width P = 20 °, and the tooth thickness angle B = 10 ° is used.

  In FIG. 4C, a chamfered portion 16 b is formed in the shaft hole 16 a of the second brake disc 16. In FIG. 2, a chamfered portion 6 a is also formed at the shaft end portion of the rotor shaft 6. By fitting the chamfered portion 6a of the rotor shaft 6 into the shaft hole 16a of the second brake disc 16 so as to overlap the chamfered portion 16b, the second brake disc 16 is prevented from rotating with respect to the rotor shaft 6 and assembled. (See FIG. 2).

  In FIG. 4B, a small-diameter cylindrical shaft fixing portion 19 is continuously formed on the opposite side of the second brake disc 16 from the braking action surface. In FIG. 4A, a screw hole 19 a that communicates with the shaft hole 16 a is provided in a part of the outer peripheral surface of the shaft fixing portion 19. In FIG. 2, screw holes 6 b are also formed in the chamfered portion 6 a of the rotor shaft 6. The second brake disk 16 is screwed and fixed to the rotor shaft 6 by fitting the screw 17 into the screw hole 19a and screwing it into the screw hole 6b of the rotor shaft 6. The shaft fixing portion 19 is disposed in the through hole 10 a of the yoke 10, and the second brake disk 16 is integrally assembled with the rotor shaft 6 so as to be rotatable.

  As described above, since the first brake disc 13 and the second brake disc 16 are assembled while being prevented from rotating in the rotation direction, the peak portions and valley portions of the first teeth 14 and the second teeth 18 are engaged with each other. Thus, the first brake disk 13 can be slid only in the axial direction together with the movable element 7 while being opposed to each other.

  The amount of rotation of the second brake disk 16 depends on the number of teeth N and the tooth thickness of the first teeth 14 and the second teeth 18, but in order to smoothly realize the brake releasing method, the following is generally performed as follows. Set to In FIG. 10, the tooth thickness angle of the first brake disk 13 is A, the tooth thickness angle of the second brake disk 16 is B, the pitch angle of the first brake disk 13 is C (360 / N), the second The maximum movement amount (rotation angle) of the second tooth 18 of the brake disk 16 is D.

  The rotation angle when the second brake disk 16 is started is controlled so that D = C− (A + B) = (C−A) −B. That is, the value (P−B) obtained by subtracting the tooth thickness B of the second brake disk 16 from the tooth gap width P = (C−A) of the first brake disk 13 is set as the upper limit value of the brake release rotation angle. In consideration of the case where the encoder 21 is omitted (when the meshing position of the teeth is unknown), the actual set value is from 1/2 of the upper limit value of the brake release rotation angle to the upper limit value (P− B).

Next, the brake releasing operation of the electromagnetic brake motor will be described with reference to the state diagrams of FIGS. 5 and 6 and the flowcharts of FIGS.
In FIG. 5, when the electric motor 1 is stopped, the first brake disc 13 is pressed against the second brake disc 16 so that the first and second teeth 14, 18 are engaged with each other. Engagement brakes are applied.
When starting the electric motor 1, the second brake disk 16 connected to the rotor shaft 6 is rotated in a predetermined direction so as to be opposed to the first and second brake disks 13 and 16 which are opposed to each other. After the meshing of the circumferential side surfaces of the teeth 14 and 18 is released, the brake coil 12 is energized to attract the mover 7 and the brake of the electric motor 1 is released.

Hereinafter, the brake releasing operation will be described in detail with reference to FIGS. 6A to 6D in which the engaging portion between the first and second brake disks 13 and 16 in FIG. 5 is enlarged.
In FIG. 6A, it is desirable that the first brake disk 13 and the second brake disk 16 mesh with the first teeth 14 and the second teeth 18 in contact with each other in the rotational direction.

  However, in reality, an external force that is always unstable in the rotational direction, such as the weight of the shutter or the load torque of the assist spring, acts on the rotor shaft 6. Therefore, the first brake disk 13 and the second brake disk 16 are relatively rotated at the rotation stop position in the clockwise direction (CW direction) in FIG. 6B, and the first teeth 14 and the second teeth are rotated. 18 facing side surfaces 14a and 18a are in contact with each other or rotating in the counterclockwise direction (CCW direction) in FIG. 6C, and the side surfaces 14b and 18b facing the first tooth 14 and the second tooth 18 are opposed to each other. Stopped in contact with each other.

  In this state, even if the brake coil 12 is energized, the contact frictional force between the side surfaces 14a, 18a facing each other or the side surfaces 14b, 18b of the first tooth 14 and the second tooth 18 due to the suction force of the mover 7 is increased. Since it is large, the mover 7 does not move, and the engagement brake cannot be released by moving the first brake disk 13 in the direction of the arrow (axial direction) in FIG. In order to solve the above problems, the brake releasing operation described below is performed.

  The brake release operation will be described with reference to the flowcharts of FIGS. A case where a hybrid stepping motor is used as the electric motor 1 will be described. The hybrid type stepping motor has a basic step angle of 1.8 ° (200 steps per round), for example, in a 1-2 phase excitation drive system, and has 15 steps (rotation angle; 1 rotation angle) with microstep drive (4 times resolution) at startup. .8 × (1/4) × 15 = 6.75 °).

First, the control operation when the encoder 21 is provided in the electric motor 1 and the controller 4 stores the rotation direction of the rotor shaft 6 detected by the encoder 21 immediately before the electric motor 1 stops will be described.
In FIG. 7, the control unit 4 first energizes the electromagnetic brake 2 (see FIG. 2) and starts a brake releasing operation (step S1).

  The control unit 4 inputs a predetermined number of pulses (K1) to the hybrid stepping motor 1 by microstep driving, and moves the motor in a CW (or CCW) direction (a direction opposite to the rotation direction stored by the control unit 4) by a predetermined amount. Rotate (for example, 15 steps on one side) (step S2), and hold the driving state of the motor 1 for a certain time (step S3).

  Thereby, even if the rotation direction side surface of the 2nd tooth | gear 18 and the 1st tooth | gear 14 is contacting, it can be rotated from a contact position to a non-contact position. Therefore, since the influence of the external force acting on the first brake disk 13 through the second brake disk 16 is eliminated, the mover 7 is sucked, and the first brake disk 13 is separated from the second brake disk 16 in the axial direction. The meshing brake is released. When the brake is released, the control unit 4 (see FIG. 1) switches to the normal 1-2 phase excitation drive system and rotates the motor 1 in a predetermined direction to perform a normal shutter winding or pulling-out operation (step S4). ).

  In addition, when the control part 4 has memorize | stored the rotation direction of the rotor shaft 6 detected by the encoder 21 just before the electric motor 1 stops, in step S1, when starting the electric motor 1 first, the control part 4 While rotating the second brake disk 16 by a predetermined amount in the direction opposite to the rotation direction detected immediately before the stop by the encoder 21, the brake coil 12 is energized at a predetermined timing in step S2 to release the meshing brake. May be. In this case, it is possible to save energy by shortening the energization time for releasing the meshing brake.

  When the first brake disc 13 is constantly pressed against the second brake disc 16 by energizing the brake coil 12 instead of the preload of the return spring 20, the control unit 4 is electromagnetic in step S1. The brake release operation is started by cutting off the power to the brake 2. Next, in step S2, the control unit 4 inputs a predetermined number of pulses (K1) to the hybrid stepping motor 1 by microstep driving, and moves the motor in the CW (or CCW) direction (opposite to the rotation direction stored by the control unit 4). The meshing brake is released by rotating it in a predetermined direction (for example, 15 steps on one side) (step S2).

  Alternatively, in step S1, when starting the electric motor 1, the control unit 4 rotates the second brake disk 16 by a predetermined amount in the direction opposite to the rotation direction detected immediately before the stop by the encoder 21 in step S2. The brake may be released by energizing (or de-energizing) the brake coil 12 at a predetermined timing. When the first brake disc 13 is constantly pressed against the second brake disc 16 by energizing the brake coil 12, the energization time to the brake coil 12 for engaging the mesh brake becomes longer, but the disaster The brake can be released even during power outages.

  Next, in FIG. 8, a brake release method when the electric motor 1 does not include the encoder 21 (when the meshing position of the teeth is unknown) will be described. The control unit 4 energizes the electromagnetic brake 2 (see FIG. 2) and starts a brake releasing operation (step S11).

  Next, the control unit 4 inputs a predetermined number of pulses (K1) to the hybrid stepping motor 1 by microstep driving and rotates it by a predetermined amount (for example, 15 steps on one side) in the CW (or CCW) direction (step S12). The driving state of the motor 1 is held for a certain time (step S13).

  Similarly, the control unit 4 inputs a predetermined number of pulses (K2) by microstep driving to the hybrid stepping motor 1 and rotates it by a predetermined amount (for example, 15 steps on one side) in the opposite direction, that is, CCW (or CW) direction (step 15). S14) The driving state of the motor 1 is held for a predetermined time (step S15).

  The motor pulse number K may be K1 = K2, or the pulse number K1 ≠ K2. The brake release operation described above is performed every time the control unit 4 starts up the electric motor 1 again after the electric motor 1 stops driving. The rotation direction when starting up the electric motor 1 is arbitrary. For example, when the shutter is opened (rolled up), it is rotated in the CCW → CW direction, and when the shutter is closed (pulled out), the direction is CW → CCW. It is good to make it rotate.

  Thereby, even if any of the rotation direction side surfaces 18a and 18b of the second tooth 18 is in contact with either of the rotation direction side surfaces 14a and 14b of the first tooth 14 (FIGS. 6B and 6C). See), and can be rotated to a non-contact position. Therefore, since the influence of the external force acting on the first brake disk 13 through the second brake disk 16 is eliminated, the mover 7 is sucked, and the first brake disk 13 is separated from the second brake disk 16 in the axial direction. The meshing brake is released. When the brake is released, the control unit 4 (see FIG. 1) switches to the normal 1-2 phase excitation drive method and rotates the motor 1 in a predetermined direction to perform a normal shutter winding or pulling operation (step S16). ).

  Next, in FIG. 9, a brake release method when the electric motor 1 does not include the encoder 21 (when the meshing position of the teeth is unknown) will be described. First, the control unit 4 energizes the electromagnetic brake 2 (see FIG. 2) to start a brake release operation (step S21).

  Next, the control unit 4 inputs a predetermined number of pulses (K1) to the hybrid stepping motor 1 by microstep driving and rotates it by a predetermined amount (for example, 15 steps on one side) in the CW direction (step S22). The driving state is held for a certain time (step S23).

  Similarly, a predetermined number of pulses (K2) is input to the hybrid stepping motor 1 by microstep driving, and is rotated by a predetermined amount (for example, 15 steps on one side) in the opposite direction, that is, CCW direction (step S24). The state is held for a certain time (step S25).

Next, a predetermined number of pulses (K3) is input to the hybrid stepping motor 1 by microstep driving, and the motor 1 is rotated again by a predetermined amount (for example, 15 steps on one side) in the CW direction (step S26). The motor pulse number K1 = K2 = K3 may be satisfied, or the pulse number K1 ≠ K2 ≠ K3 may be satisfied.
The brake release operation described above is performed every time the control unit 4 starts the motor 1 again after the motor 1 is stopped.

  Thereby, even if any of the rotation direction side surfaces 18a and 18b of the second tooth 18 is in contact with either of the rotation direction side surfaces 14a and 14b of the first tooth 14, it is reliably rotated to the non-contact position. be able to. Therefore, since the influence of the external force acting on the first brake disk 13 through the second brake disk 16 is eliminated, the mover 7 is sucked, and the first brake disk 13 is axially moved from the second brake disk 16 in the axial direction. And the brake is released.

  When the brake is released, the control unit 4 (see FIG. 1) switches to the normal 1-2 phase excitation drive method and rotates the electric motor 1 in a predetermined direction to perform a normal shutter winding or pulling operation (step S27). ). Therefore, since the brake releasing operation of the electric motor 1 can be reliably performed regardless of the fluctuation of the external force acting on the rotor shaft 6, the shutter can be pulled out and rolled up smoothly.

When the first brake disc 13 is constantly pressed against the second brake disc 16 by energizing the brake coil 12 instead of the preload of the return spring 20, the control unit in step S11 and step S21. 4 cuts off the energization of the electromagnetic brake 2 and starts the brake release operation. Next, in step S12 and step S22, the control unit 4 inputs a predetermined number of pulses (K1) to the hybrid stepping motor 1 by microstep driving, and moves the motor in the CW (or CCW) direction (the rotation stored by the control unit 4). The motor 1 is rotated in a predetermined amount (for example, 15 steps on one side) in a direction opposite to the direction, and the driving state of the motor 1 is held for a certain time in steps S13 and S23. The meshing brake is released by repeating the above operation in the CCW (or CW) direction in the same manner.
Alternatively, in step S11 and step 21, when starting the electric motor 1, the control unit 4 rotates the second brake disk 16 in a predetermined direction by a predetermined amount (steps S12 to S15, steps S22 to S26) and starts a rotating operation. Then, the brake may be released by energizing (or de-energizing) the brake coil 12 at a predetermined timing.

Although the above embodiment has been described with respect to the electric winding device for the shutter, it may be applied to a winding device for other long objects such as curtains, blinds, and awnings.
The electric winding device may have a device configuration other than the tubular type. That is, the electric motor with an electromagnetic brake may be housed in a drive unit provided outside the winding shaft together with a clutch mechanism or the like.

It is a block block diagram of the drive part of an electric winding apparatus. It is a fragmentary sectional view of the electric motor with an electromagnetic brake. It is the left view of an 1st brake disc, an axial direction fragmentary sectional view, and a right view. It is the left view of an 2nd brake disc, an axial sectional view, and a right view. It is an axial direction fragmentary sectional view of the 1st, 2nd brake disc. It is a schematic diagram which shows the meshing state of the 1st, 2nd teeth of a 1st, 2nd brake disc. It is a flowchart which shows release operation | movement of an electromagnetic brake. It is a flowchart which shows the releasing operation | movement of the electromagnetic brake which concerns on another example. It is a flowchart which shows the releasing operation | movement of the electromagnetic brake which concerns on another example. It is a schematic diagram explaining the maximum moving amount (rotation angle) of the 2nd tooth | gear of a 2nd brake disc.

Explanation of symbols

1 Electric motor (stepping motor)
2 Electromagnetic brake 3 Clutch mechanism
4 Control unit
5 Motor body
5a Axial side
6 Rotor shaft
6a, 16b Chamfer
6b, 19a Screw hole
7 Mover
8 Stator 9 Back yoke
10 York
10a Through hole
11 Coil bobbin
11a, 16a Shaft hole
12 Brake coil
13 First brake disc
13a recess
14 First tooth
15 Movable body
15a ridge
16 Second brake disc
17 Screw
18 second tooth
19 Shaft fixing part
20 Return spring 21 Rotation detector (encoder)

Claims (6)

An electric motor,
An electromagnetic brake in which a rotor shaft is extended from the electric motor body, and a mover and a brake coil are arranged concentrically around the extended rotor shaft;
A first brake disc provided at a shaft end of the mover and having first teeth formed at predetermined intervals in the circumferential direction;
A second brake disk, which is integrally assembled with the rotor shaft so as to face the first brake disk, and second teeth are formed at predetermined intervals in the circumferential direction;
When the electric motor is stopped, the first brake disc is constantly pressed against the second brake disc to engage the rotation of the electric motor, and the engagement brake is applied when starting the electric motor. A controller that controls the drive of the motor after releasing
When the motor starts the motor, the meshing brake release operation and the second brake disk are rotated at least in the clockwise direction (CW) and counterclockwise direction (CCW) in parallel to release the meshing brake. Electric motor with electromagnetic brake. When the control unit to start the motor, the electric motor C W-CCW-CW direction or CCW-CW-CCW direction to a predetermined amount mesh brake by rotating is released according to claim 1, wherein the motor-driven electromagnetic brake .   The electric motor with an electromagnetic brake according to claim 1 or 2, wherein a stepping motor is used as the electric motor, and when the electric motor is started, the control unit rotates the second brake disk by a predetermined amount in a predetermined direction by a microstep driving method. . An electric motor,
An electromagnetic brake in which a rotor shaft is extended from the electric motor body, and a mover and a brake coil are arranged concentrically around the extended rotor shaft;
A first brake disc provided at a shaft end of the mover and having first teeth formed at predetermined intervals in the circumferential direction;
A second brake disk, which is integrally assembled with the rotor shaft so as to face the first brake disk, and second teeth are formed at predetermined intervals in the circumferential direction;
A rotation detector for detecting a rotation direction of the rotor shaft;
When the motor is in a stopped state, the first brake disc is always pressed against the second brake disc to engage with the rotation of the motor, and the engagement brake is released when starting the motor. A control unit for driving and controlling the motor,
When starting up the electric motor, the control unit engages with the engagement brake by releasing the engagement brake release operation and the rotation operation of the second brake disk in the direction opposite to the rotation direction detected by the rotation detection unit immediately before stopping. Motor with electromagnetic brake that is released.   5. The electromagnetic brake according to claim 4, wherein when the electric motor is started, the meshing brake is released while rotating the second brake disk by a predetermined amount in a direction opposite to the rotation direction detected immediately before the stop by the rotation detection unit. Electric motor with brake.   6. The electric motor with an electromagnetic brake according to claim 4, wherein a stepping motor is used as the electric motor, and when the electric motor is started, the control unit rotates the second brake disk by a predetermined amount by a microstep driving method.

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