JP2011256014A - Electromagnetic brake and elevator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fixed stagnation of a bearing, by detecting abrasion of the bearing arranged between an electromagnet and a movable iron piece of an electromagnetic brake, that is, detecting a position in the lateral direction to the output direction of the movable iron piece.SOLUTION: This electromagnet brake is constituted so as to add braking force by imparting pressing force directly or via a braking arm 4 as an interlocking means to a braking piece 3 by a braking spring 5, pressing a brake drum 1 as a braking object, and to release braking force by electromagnetically attracting and outputting the movable iron piece 11 by the electromagnet 8 constituted of an electromagnetic coil 9 and a yoke 10, and driving the braking piece 3 directly or via the interlocking means. In the electromagnet brake, a relative position of the electromagnet 8 and a movable body is detected by a position detecting means. The position detecting means detects the relative position of the electromagnet 8 and the movable iron piece 11 by displacement in the lateral direction to the output direction of electromagnetic attraction of the movable iron piece.

Description

  The present invention relates to an electromagnetic brake and an elevator apparatus that apply braking by pressing a braking piece with a braking spring and release braking with an electromagnet.

  Conventionally, an electromagnetic brake mainly applies a pressing force directly to a braking piece by a braking spring or via a braking arm as an interlocking unit, presses a brake drum as a braked body, adds a braking force, and uses an electromagnet. The movable iron piece is electromagnetically attracted and output, and the braking piece is driven directly or via interlocking means to release the braking force.

  Then, the wear of the bearing provided between the electromagnet of the electromagnetic brake and the movable iron piece is detected, that is, the position in the lateral direction with respect to the output direction of the movable iron piece is detected, and the bearing becomes a movable body to prevent the astringency of the bearing. A position sensor that detects the position or displacement of the movable iron piece or a detection method using a laser, a microswitch, a displacement detector, a differential transformer, a mechanical contact, etc. as a displacement sensor (for example, see Patent Documents 1 to 4) ) Is disclosed.

  Moreover, the shape (for example, refer patent document 5) of the magnetic pole surface in which electromagnetic attraction force generate | occur | produces between an electromagnet and an iron piece is disclosed.

Japanese Patent Laid-Open No. 7-330238 (FIG. 1) Japanese Utility Model Publication No. 62-98675 (FIG. 1) Japanese Examined Patent Publication No. 2-336518 (Fig. 1) JP-A-8-59147 (FIGS. 1 and 8) Japanese Unexamined Patent Publication No. 2003-68524 (FIGS. 1, 5, 6, 7, and 8)

  1 of Patent Document 1 is a laser displacement meter, FIG. 1 of Patent Document 2 is a microswitch, FIG. 1 of Patent Document 3 is a displacement detector, FIG. 1 of Patent Document 4 is a differential transformer, and FIG. The automatic switch is shown. However, both of these detections are in the output direction of the movable iron piece that is electromagnetically attracted to the electromagnet, and in the direction in which the bearing supporting the movable iron piece is worn, that is, in the direction transverse to the output direction of the movable iron piece. Absent. Therefore, there is a problem that the wear of the bearing cannot be detected, and the movable iron piece becomes hard.

  Patent Document 5 discloses a shape of a magnetic pole surface that is electromagnetically attracted between an electromagnet of an electromagnetic brake and a movable iron piece. FIG. 1 shows a planar shape, FIG. 5 shows a stepped cone shape, FIG. 6 shows a planar shape with unevenness, and FIG. 7 shows a cone shape. However, these shapes have a structure in which an electromagnetic attraction force in a lateral direction is remarkably applied to the output direction of the movable iron piece (vertical direction on the paper surface), and a resistance force is generated in the movement of the movable iron piece.

  The object of the present invention is to detect the wear of the bearing provided between the electromagnet of the electromagnetic brake and the movable iron piece, that is, to detect the position in the lateral direction with respect to the output direction of the movable iron piece, and to prevent the movable iron piece from becoming stuck. It is in providing a highly reliable electromagnetic brake and elevator.

  In order to achieve the above object, in the present invention, a braking force is applied to the braking piece directly or via a braking arm as interlocking means with a braking spring to press a brake drum as a braked body and add a braking force, The movable iron piece is electromagnetically attracted and output by an electromagnet composed of an electromagnetic coil and a yoke, and the braking force is released directly or via the interlocking means to release the braking force. The relative position of the electromagnet and the movable body In the electromagnetic brake in which the position detecting means detects the position, the position detecting means detects the relative position between the electromagnet and the movable iron piece by a lateral displacement with respect to the output direction of the electromagnetic suction of the movable iron piece. It is characterized by that.

  With this configuration, the wear of the bearing provided between the electromagnet of the electromagnetic brake and the movable iron piece is detected, that is, the relative position in the lateral direction with respect to the output direction of the movable iron piece is detected, and the moving iron piece is prevented from becoming stuck and reliable. A highly reliable electromagnetic brake can be obtained.

  Further, the present invention is characterized in that the lateral displacement is detected by position detecting means provided on the outer peripheral portion of the movable iron piece and the electromagnet.

  With this configuration, an electromagnetic brake similar to that described above can be obtained, and the position detector can be easily mounted.

  In the present invention, the position detecting means is any one of a switch means, a pressure sensitive means, a capacitance means, a magnetic means, and an optical means.

  With this configuration, an electromagnetic brake similar to that described above is obtained, and a general-purpose position detector is used.

  In the present invention, at least three position detection means are provided when the detection output is an ON-OFF signal.

  With this configuration, an electromagnetic brake similar to that described above can be obtained, and position detection can be performed with at least three position detection means.

  In the present invention, at least two position detection means are provided when the detection output is continuous, and are arranged so that the installation angle does not become 180 degrees.

  With this configuration, an electromagnetic brake similar to that described above can be obtained, and position detection can be performed with at least two position detection means.

  According to the present invention, a drive sheave around which a main rope that engages a car on one side and a counterweight on the other side is wound, an electric motor that drives the drive sheave, and an electromagnetic that brakes the drive sheave and the electric motor. A hoisting machine composed of a brake device, and applying a pressing force to the braking piece directly or via a braking arm as interlocking means with a braking spring, It is configured to press and apply braking force, electromagnetically attract and output the movable iron piece with an electromagnet composed of an electromagnetic coil and a yoke, and drive the braking piece directly or via interlocking means to release the braking force, In the elevator apparatus in which the relative position between the electromagnet and the movable body is detected by the position detection means, the position detection means determines the relative position between the electromagnet and the movable iron piece in the output direction of electromagnetic attraction of the movable iron piece. As detected by lateral displacement against, when the output of the position detecting means is determined to be abnormal, characterized in that so as to stop driving the elevator to the nearest floor.

  With this configuration, a highly reliable elevator can be obtained.

  According to the present invention, the wear of the bearing provided between the electromagnet of the electromagnetic brake and the movable iron piece is detected, that is, the position in the lateral direction with respect to the output direction of the movable iron piece is detected, and the solidity of the movable iron piece is prevented. A highly reliable electromagnetic brake and elevator can be obtained.

It is a figure which shows the whole structure of the electromagnetic brake which becomes one Embodiment of this invention, and the structure of an elevator. It is sectional drawing of the electromagnetic drive means which provided the switch means as a position detection means. FIG. 3 is a view corresponding to FIG. 2 showing when the electromagnetic driving means is energized with an electromagnet. It is an AA arrow line view which shows the magnetic pole surface of FIG. FIG. 4 is a view corresponding to FIG. 3 showing a state where the electromagnet is energized and the movable iron piece is displaced laterally. It is a BB arrow line view which shows the magnetic pole surface of FIG. FIG. 3 is a view taken along the line CC in FIG. 2 showing a case where three switch means for detecting the lateral displacement of the movable iron piece at the outer periphery of the movable iron piece are arranged in FIG. 2. FIG. 8 is a view corresponding to FIG. 7 showing a case where four switch means for detecting the lateral displacement of the movable iron piece at the outer periphery of the movable iron piece are arranged in FIG. 2. FIG. 3 shows a method for detecting the lateral displacement of the movable iron piece by the pressure-sensitive means, and is a view corresponding to FIG. 2 when the electromagnet is turned off. FIG. 10 is a view corresponding to FIG. 9 in which position detecting means using pressure sensitive means is provided on the entire outer periphery. It is a DD arrow line view of FIG. FIG. 3 is a view corresponding to FIG. 2 in which magnetic means is provided on the outer periphery as position detection means. FIG. 3 is a view corresponding to FIG. 2 in which optical means or capacitance means is provided on the outer peripheral portion as position detection means. FIG. 8 is a view corresponding to FIG. 7 showing an arrangement of at least two position detection means.

  Hereinafter, a first embodiment of an electromagnetic brake and an elevator apparatus according to the present invention will be described with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a brake drum as a braked body. An electromagnetic brake device 2 is provided to brake the brake drum 1, and each of them is composed of a pair of electromagnetic brakes 2a and 2b that function independently as brakes. The structure and configuration are as follows.

  A pair of braking pieces 3 abut on the braking surface 1a of the brake drum 1 from the left and right. Reference numeral 4 denotes a pair of braking arms as interlocking means. The braking piece 3 is provided in the intermediate portion 4c, and the one end portion 4a is rotatably supported. Reference numeral 5 denotes a pair of braking springs, which are arranged at the other end 4b of the braking arm 4 so that the braking piece 3 applies a pressing force to the braking surface 1a and applies a braking force. Reference numeral 6 denotes an L-shaped lever as interlocking means, which is rotatably supported by a pin 7. One side of the L-shaped lever 6 is connected to the other end 4b of the braking arm 4, and the other side of the L-shaped lever 6 is movable as described later. It connects with the axis | shaft 12 couple | bonded with the iron piece 11. FIG.

  A pair of electromagnets 8 are fixed so as to drive the other side of the L-shaped lever 6 with a shaft 12 coupled to the movable iron piece 11 so as to release the pressing force of the braking spring 5 and release the braking force. Provided. The electromagnetic drive means 13 includes an electromagnet 8, a movable iron piece 11, and a shaft 12. Each of the electromagnets 8 includes an electromagnetic coil 9 and a yoke 10, and a movable iron piece 11 is disposed so as to face the magnetic pole surface of the electromagnet 8. The movable iron piece 11 is coupled to one end of a shaft 12 that is slidably supported at the central portion of the yoke 10, and the other end of the shaft 12 is connected to the other side of the L-shaped lever 6 and is braked via the L-shaped lever 6. The arm 4 is driven, and the brake piece 3 is integrally driven. In this embodiment, the movable iron piece 11 is operated in the vertical direction, the L-shaped lever 6 is used to change the direction of movement in a substantially right-angle direction, and is operated in the left-right direction with the one end 4a of the braking arm 4 as the center of rotation.

  That is, the electromagnetic brakes 2a and 2b are constituted by the braking piece 3, the braking arm 4, the braking spring 5, the L-shaped lever 6, and the electromagnetic driving means 13, and are installed substantially symmetrically. There is also a structure in which the braking arm 4 and the L-shaped lever 6 as interlocking means are not provided, and the braking piece 3 is directly pressed by the braking spring 5 and released directly by the movable iron piece 11. Is applicable.

  Reference numeral 14 denotes a coil excitation power supply that energizes the electromagnetic coil 9 of the pair of electromagnets 8 to control the current. Reference numeral 15 denotes a contact of an electromagnetic contactor that energizes and interrupts the electromagnetic coil 9 of the pair of electromagnets 8.

  Reference numeral 16 denotes a position detecting means for the movable iron piece 11. The movable iron piece 11 is electromagnetically attracted and detects a relative position in the lateral direction with respect to the output movable direction of the shaft 12.

  The electromagnetic brake device 2 is used, for example, in an elevator hoisting machine 17. A wire rope 19 is wound around a driving sheave 18 of the hoisting machine, a car 20 is engaged with one of the wire ropes, and a counterweight 21 is engaged with the other. Are engaged, the driving sheave 18 is driven by the electric motor 17a of the hoisting machine 17, the wire rope 19 is driven, and the car 20 is operated up and down. At this time, the electromagnetic brake device 2 brakes the hoisting machine 17 when the electromagnet 8 is deenergized and stops and holds the car 20. Further, the energization of the electromagnet 8 releases the hoisting machine 17 so that the car 20 can be operated.

  The operation of the electromagnetic brakes 2a and 2b of this embodiment will be described.

FIG. 1 shows that the electromagnet 8 is in a braking applied state when the energization is cut off. When the contact 14 is connected and the electromagnet 8 is energized, the movable iron piece 11 is electromagnetically attracted, the shaft 12 is displaced downward on the paper surface, the L-shaped lever 6 is rotationally displaced, and rotates about the one end 4 a of the braking arm 4. displaced, the other end portion 4b of the brake arm 4 of the right and left side is displaced in the arrow Y _B direction, the braking piece 3 is displaced in the arrow Y _S direction, and braking is braking members 3 apart from the brake drum 1 surface Canceled. When the electromagnet 8 is de-energized, the brake application state shown in FIG. 1 is restored.

  2 to 6, the shaft 12 coupled to the movable iron piece 11 is supported by a bearing 22. When the electromagnet 8 is energized, the movable iron piece 11 is electromagnetically attracted and the shaft 12 slides downward in the drawing. The magnetic pole surface between the movable iron piece 11 and the electromagnet 8 is fitted in an uneven shape, for example. That is, a circular concave groove 11a is provided on the movable iron piece side, and a circular convex protrusion 10a is provided on the yoke 10 side of the electromagnet 8 so as not to contact the concave groove 11a.

Reference numeral 23 denotes a gap holding piece, which maintains a constant gap between the magnetic pole surfaces of the electromagnet 8 when the movable iron piece 11 is electromagnetically attracted. A spring 24 prevents rattling between the movable iron piece 11 and the electromagnet 8. 25 is a switching means for outputting the ON-OFF signal, such as a micro switch as a position detection means 16, provided from the yoke 10 side of the electromagnet 8 via a support member 26, the transverse direction of the movable iron member 11 indicated by an arrow Y _A Are disposed at a predetermined detection distance G that is determined to be abnormal. When the movable iron piece 11 is displaced in a predetermined lateral direction due to the wear of the bearing 12, the switch means 25 operates to output an ON or OFF signal and determine that it is abnormal.

  When the electromagnet 8 is energized, as shown in FIG. 3, the movable iron piece 11 is attracted and held in a fixed gap by the gap holding piece 23. In a normal normal state, as shown in FIG. 4, the concave grooves 11a and the convex protrusions 10a are fitted at equal intervals, and the transverse electromagnetic attractive force generated between the concave grooves 11a and the convex protrusions 10a is balanced. is doing. However, as shown in FIG. 5, when the movable iron piece 11 is displaced laterally together with the shaft 12 due to wear of the bearing 22, the balance of the lateral electromagnetic attractive force between the convex protrusion 10a and the concave groove 11a is lost as shown in FIG. A lateral force acts in the direction of arrow E on the side where the distance between the concave groove 11a and the convex protrusion 10a is narrow.

  With this force, the wear of the bearing 22 is further advanced. As the wear of the bearing 22 progresses, the shaft 12 comes into contact with the yoke 10 and becomes astringent, and does not function as the electromagnetic brakes 2a and 2b.

  The magnetic pole surface shape in which a lateral electromagnetic attractive force is generated between the electromagnet 8 and the magnetic pole surface of the movable iron piece 11 is, in particular, a stepped cone shape and a cone shape as shown in Patent Document 5 in addition to FIG. Yes, the magnetic flux passes in the transverse direction with respect to the output direction of the movable iron piece 11 (vertical direction on the paper surface), and the electromagnetic attracting force in the lateral direction acts to become the frictional resistance force of the movement of the axis of the movable iron piece.

  7 to 8, at least three switch means 25 are provided. That is, in FIG. 7, the displacement of the direction F toward the switch means 25a can be detected with a single switch means 25a, but the displacement in the direction I perpendicular to the directions H and F away from the switch means 25a cannot be detected.

  Further, in the two arrangements of the switch means 25a and 25b, the displacement in the direction F toward the switch means 25a and 25b can be detected in the same manner as the one arrangement, but the displacement in the direction J away from the two switch means 25a and 25b is There is a problem that it cannot be detected.

  Therefore, as shown in FIG. 7, detection can be performed by arranging three switch means 25a, 25b, and 25c at intervals of α = 120 degrees in the circumferential direction. For example, with respect to the displacement D in the intermediate direction of the switch means 25a, 25b, the displacement toward the switch means 25a, 25b is D × cos (α / 2) = 0.5, and the detection sensitivity is halved. The detection distance G of the switch means 25a and 25b is set in consideration of a decrease in detection sensitivity. The same applies to detection between the switch means 25b and 25c and detection between the switch means 25c and 25a. In the above description, the switch means 25a, 25b, and 25c are installed in the circumferential direction at equal intervals of α = 120 degrees. However, it is obvious that lateral displacement can be detected even if they are installed at unequal intervals. In this case, since the detection sensitivity differs depending on the installation interval angle of the switch means 25a, 25b, 25c, the detection distances Ga, Gb, Gc are set, respectively.

  FIG. 8 shows a case where four switch means 25a, 25b, 25c, and 25d are arranged at intervals of approximately β = 90 degrees in the circumferential direction. The detection sensitivity is improved as compared with the case of three in FIG. 7. For example, the displacement toward the switch means 25a, 25b with respect to the displacement D in the middle direction of the switch means 25a, 25b is D × cos (β / 2) = It becomes 0.707, and the sensitivity improves compared with the case of three. That is, the detection sensitivity improves as the number of the switch means 25 arranged increases.

  As described above, the effect of this embodiment is that the lateral displacement of the movable iron piece of the electromagnetic brake is detected by three or more switch means that output an ON-OFF signal such as a micro switch as a position detection means. Therefore, it is possible to obtain a highly reliable electromagnetic brake by detecting the wear of the bearing and preventing the shaft from becoming stuck.

  Next, a second embodiment will be described based on FIG.

  This embodiment differs from the first embodiment in that three or more pressure-sensitive means such as a piezoelectric sensor and a conductive sensor as the position detection means 16 are provided on the outer peripheral portion of the movable iron piece as a lateral displacement of the movable iron piece 11. It is. The same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 9, reference numeral 31 denotes a pressure sensing means, which is provided from the yoke 10 side of the electromagnet 8 via the support member 26, and is a predetermined detection that is determined to be abnormal so as to detect the relative position in the lateral direction of the movable iron piece 11. Arranged at intervals G. When the movable iron piece 11 is displaced in a predetermined lateral direction due to wear of the bearing 22 and comes into contact with the pressure-sensitive means 31, the pressure-sensitive means 31 outputs an ON-OFF detection signal and determines that it is abnormal. The detection distance G from the movable iron piece 11 is the same as that in the first embodiment. At this time, as in the first embodiment, at least three pressure-sensitive means 31 are provided.

  The effect of this embodiment is the same as that of the second embodiment.

  Next, a third embodiment will be described with reference to FIGS.

This embodiment is different from the second embodiment in that pressure sensing means as the position detection means 16 is provided on the entire outer periphery of the movable iron piece. The same parts as those of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  10 and 11, reference numeral 32 denotes an annular pressure-sensitive means, which is disposed on the inner peripheral portion of the support member 26 provided from the outer peripheral portion side of the yoke 10. It arrange | positions with the predetermined | prescribed detection distance G judged to be abnormal so that the horizontal relative position of the movable iron piece 11 may be detected. When the movable iron piece 11 is displaced in a predetermined lateral direction due to wear of the bearing 22 and comes into contact with the pressure-sensitive means 32, the pressure-sensitive means 32 outputs a detection signal and determines that it is abnormal.

  The effect of this embodiment is the same as that of the second embodiment, and the detection sensitivity is equal regardless of the position on the periphery for detecting the entire circumference.

  Next, a fourth embodiment will be described with reference to FIGS.

  This embodiment differs from the first to third embodiments in that the position detecting means 16 is a magnetic means such as a differential transformer capable of continuously detecting the position, an optical means such as a laser sensor, or an electrostatic such as a capacitance sensor. The capacity means is provided on the outer peripheral portion of the movable iron piece 11. The same parts as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 12, 41 is a magnetic means and is installed on the support member 26 provided from the outer peripheral side of the yoke 10. The detector 42 is disposed in contact with the movable iron piece 11 so as to detect the relative position of the movable iron piece 11 in the lateral direction. The magnetic means 41 is for continuously detecting and outputting the lateral displacement of the movable iron piece 11. When the movable iron piece 11 is displaced in a predetermined lateral direction due to the wear of the bearing 22 and the magnetic means 41 has a predetermined output, it is determined as abnormal.

  In FIG. 13, the optical means 43 or the capacitance means 44 is installed on the support member 26 provided from the outer peripheral side of the yoke 10. The optical means 43 or the electrostatic capacity means 44 is arranged in contact with the movable iron piece 11 in a non-contact manner so as to detect the relative position of the movable iron piece 11 in the lateral direction, and is continuous with respect to the lateral displacement of the movable iron piece 11. It detects and outputs. When the movable iron piece 11 is displaced in a predetermined lateral direction due to wear of the bearing 22 and the optical means 43 or the electrostatic capacity means 44 has a predetermined output, it is determined that there is an abnormality.

  Note that at least two position detecting means 16 of the magnetic means 41, the optical means 43, and the electrostatic capacity means 44 are provided. In FIG. 14, the displacement in the detection direction of one arrangement of the position detection means 16a can be detected both in the direction toward and away from the position detection means 16a, but the displacement in the direction perpendicular to the detection direction of the position detection means 16a cannot be detected. There is a problem. Therefore, the two position detection means 16a and 16b are arranged at intervals of the installation angle γ = 90 degrees in the circumferential direction. That is, similar to the description in FIGS. 7 and 8, for example, the displacement in the direction toward and away from the position detection means 16a and 16b is D × with respect to the displacement D in the intermediate direction of the position detection means 16a and 16b. cos (γ / 2) = 0.707, which can be detected although the sensitivity decreases. And the position detection means 16 is arrange | positioned in consideration of the fall of this sensitivity. In addition, the detection sensitivity is improved as the number of the position detection means 16 is increased. However, when the two position detection means are arranged so that the installation angle γ = 180 degrees, the right angle direction connecting the two position detection means cannot be detected, so that the installation angle γ is not set to 180 degrees. It is clear that the detection sensitivity improves as the number of the position detection means 16 is increased.

  The abnormality detection signal by the position detection means 16 described in the first to fourth embodiments is used in, for example, the elevator described with reference to FIG. 1, and when the abnormality is detected, the elevator is driven to the nearest floor. Stop. As a result, a highly reliable elevator is obtained.

  The effect of this embodiment is the same as that of the first and second embodiments, and the output for the displacement is continuous, so that the position can be detected by at least two position detectors.

DESCRIPTION OF SYMBOLS 1 Brake drum 2 Electromagnetic brake device 3 Brake piece 4 Brake arm 5 Brake spring 8 Electromagnet 9 Electromagnetic coil 10 Relay 11 Movable piece 16 Position detection means 17 Hoisting machine 17a Electric motor 18 Drive sheave 19 Wire rope 20 Carriage 21 Balance weight 25 Switch means 31, 32 Pressure sensitive means 41 Magnetic means 43 Optical means 44 Capacitance means

Claims (6)

Apply a pressing force to the braking piece directly or via a braking arm as interlocking means with a braking spring, press the brake drum as a braked body, apply braking force, and electromagnetically attract and output the movable iron piece with an electromagnet In the electromagnetic brake configured to release the braking force by driving the braking piece directly or via interlocking means, and detecting the relative position of the electromagnet and the movable iron piece by the position detection means,
The electromagnetic brake according to claim 1, wherein the position detecting means detects a relative position between the electromagnet and the movable iron piece by a lateral displacement with respect to an output direction of electromagnetic attraction of the movable iron piece.   2. The electromagnetic brake according to claim 1, wherein the displacement in the lateral direction is detected by position detection means provided on an outer peripheral portion of the movable iron piece and the electromagnet.   2. The electromagnetic brake according to claim 1, wherein the position detecting means is one of a switch means, a pressure sensitive means, a capacitance means, a magnetic means, and an optical means.   2. The electromagnetic brake according to claim 1, wherein three or more position detection means are provided when the detection output is an ON-OFF signal.   2. The electromagnetic brake according to claim 1, wherein two or more of the position detection means are provided when the detection output is continuous, and are arranged so that the installation angle does not become 180 degrees. A drive sheave around which a main rope that engages a car on one side and a counterweight on the other side is wound, an electric motor that drives the drive sheave, and an electromagnetic brake device that brakes the drive sheave and the electric motor. The electromagnetic brake device applies a pressing force to the braking piece directly or via a braking arm as an interlocking means with a braking spring to press a brake drum as a braked body and add a braking force. The movable iron piece is electromagnetically attracted and output by an electromagnet composed of an electromagnetic coil and a yoke, and the braking piece is driven directly or via interlocking means to release the braking force. In the elevator apparatus that detects the relative position by the position detection means,
The position detecting means detects the relative position between the electromagnet and the movable iron piece by a lateral displacement with respect to the output direction of electromagnetic attraction of the movable iron piece, and the output result of the position detecting means is determined to be abnormal. An elevator device characterized in that the elevator is driven to the nearest floor and stopped.

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