Electric machine with electromagnetically operable brake

Abstract

The invention relates to an electric machine with an electromagnetically operable brake, wherein the brake has a manual release lever, wherein in a first rotational position of the manual release lever the brake is released or engaged depending on whether the coil of the brake is energized or not, wherein in a second rotational position of the manual release lever the brake is released, in particular independently of whether the coil of the brake is energized or not, wherein a distance sensor is arranged on the electric machine for detecting the rotational position of the manual release lever.

Description

Technical Field

[0001] This invention relates to a motor having an electromagnetically operable brake. Background Technology

[0002] As is well known, brakes can be operated electromagnetically. Summary of the Invention

[0003] Therefore, the purpose of this invention is to further improve the operational safety of motors.

[0004] According to the present invention, this objective is achieved by a motor according to the features given in claim 1.

[0005] A key feature of motors with electromagnetically operable brakes is that the brakes have a manual release lever.

[0006] In the first rotational position of the manual release lever, the brake is released / opened or engaged depending on whether the brake coil is energized or not.

[0007] Specifically, in the second rotational position of the manual release lever, the brake is released, regardless of whether the brake coil is energized or not.

[0008] A distance sensor is installed on the motor to detect the rotational position of the manual release lever.

[0009] The advantage here is that the rotational position of the manual release lever can be monitored, thereby ensuring and improving operational safety. In particular, by initiating normal operation with an energized coil and thus released brake, clearly defined reliable operation is ensured during the transition / transition from manual release operation to normal operation. Therefore, the two operating modes do not work contradictorily during the transition, but rather work together undisturbed. This, in particular, avoids the need to overcome the spring force of the brake's spring element to place the manual release lever in the first rotational position when ending manual release operation.

[0010] In an advantageous design, the distance detected by the distance sensor between the distance sensor and the manual release lever, or between the distance sensor and the plate connected to the manual release lever, is smaller in the first rotational position of the manual release lever than in the second rotational position. The advantage here is that the rotational position of the manual release lever can be detected by means of a distance sensor—especially by means of linear distance detection.

[0011] In one advantageous design, the distance detected by the distance sensor is set in the axial direction. The advantage here is that the distance can be detected simply.

[0012] In an advantageous design, the manual release lever is supported in a manner rotatable about a rotation axis, which is radially oriented, specifically radially, with reference to the rotation axis of the motor rotor shaft. This has the advantage of enabling simple axial operation of the manual release lever.

[0013] In an advantageous design, the distance sensor is connected to and held by a retainer.

[0014] The retaining member is held in place by means of pins, particularly spaced pins, spaced apart from the motor housing, and especially from the first flange of the motor. An advantage of this is that it allows for simple fixing of the distance sensor.

[0015] In an advantageous design, the pin is oriented axially and spaced apart from the distance sensor in the circumferential direction. The advantage here is that sufficient structural space is available for the distance sensor.

[0016] In an advantageous design, the plate connected to the manual release lever is a stamped part, particularly a flat plate, wherein the normal of the flat plate is oriented parallel to the axial direction. The advantage here is that the distance sensor is spaced apart from the manual release lever in the circumferential direction, thereby providing sufficient space for operating the manual release lever.

[0017] In an advantageous design, the circumferential angular region covered by the distance sensor in the circumferential direction—especially with reference to the rotation axis of the rotor shaft—is spaced apart from the circumferential angular region covered by the manual release lever. The manual release lever and the distance sensor cover the same radial distance region.

[0018] In particular, the distance sensor covers the cylindrical space volume, and the axis of the cylinder is oriented parallel to the axial direction. An advantage here is that the distance sensor is spaced apart from the manual release lever in the circumferential direction, thus providing sufficient space for operating the manual release lever.

[0019] In an advantageous design, the manual release lever is hinged to a limiting member, which is axially movable and acts as an axial restraint on the armature disc of the brake. The advantage here is that the manual release lever can be operated at a radial distance, for example, a greater radial distance, at which the limiting member restricts the armature disc.

[0020] In an advantageous design, the armature disc is configured such that it cannot rotate relative to the brake magnet and / or relative to the motor housing, but can move axially.

[0021] The brake pad bracket is connected to the rotor shaft in a manner that prevents relative rotation but allows axial movement.

[0022] The armature disk is arranged axially between the magnet and the brake pad bracket.

[0023] The coil is housed within the magnet, particularly in the recesses of the magnet.

[0024] In particular, the brake pad support is axially positioned between the brake surface formed on the flange, especially the finely ground brake surface, and the armature disc. The advantage here is that the brake can be operated by energizing the coil as long as the manual release lever is in the first rotational position.

[0025] In an advantageous design, when the manual release lever is in the first rotational position...

[0026] When the coil is energized, the armature disk is attracted toward the magnet against the spring force generated by the spring element.

[0027] -When the coil is not energized, the armature disc is pressed against the brake pad bracket by the spring element.

[0028] And among them,

[0029] When the manual release lever is in the second rotation position

[0030] The armature disc—especially regardless of whether the coil is energized or not—remains pressed toward the magnet by the restraint.

[0031] The advantage here is that manual release can end normal operation and can force the brake to release.

[0032] In an advantageous design, the magnet and the flange are connected in a manner that prevents relative rotation. The advantage here is that the brake can transfer the braking torque generated between the brake pad support and the armature disc, which are connected to the rotor shaft in a manner that prevents relative rotation, to the flange via the magnet.

[0033] An important feature of drive devices with the aforementioned motors is that...

[0034] The distance sensor is connected to the electronic control unit that controls the brake.

[0035] In particular, the inverter, which includes an electronic control unit, supplies power to the motor.

[0036] The advantage here is that reliable operation of the drive unit can be achieved. This is because it ensures that the coil is energized during the transition from manual release operation to normal operation, and therefore it is not necessary to overcome the spring force generated by the spring element to initiate manual release operation.

[0037] An important feature of the method for operating the aforementioned drive device with an electric motor is that...

[0038] After detecting the transition of the manual release lever from the second rotation position to the first rotation position, especially the transition of the brake from manual release operation to normal operation,

[0039] Especially when the second rotation position has been left, i.e., when below the second threshold, but especially in any case from below the first threshold,

[0040] Both energize the coils, thus releasing the brakes through the energization of the coils.

[0041] The advantage here is that the operation of the drive unit can be achieved as reliably as possible. This is because when transitioning from manual release operation to normal operation, the coil is energized and therefore the manual release lever is not operated by overcoming the spring force generated by the spring element of the brake.

[0042] Other advantages arise from the dependent claims. The invention is not limited to the combination of features of the claims. For those skilled in the art, particularly from the perspective of the intended purpose and / or by comparison with the prior art, other meaningful combinations of claims and / or individual claim features and / or specification features and / or drawing features are possible. Attached Figure Description

[0043] The invention will now be explained in detail with the aid of schematic diagrams:

[0044] exist Figure 1 The image shows a perspective view of a portion of a motor with a sensor device according to the present invention.

[0045] List of reference numerals in the attached diagram:

[0046] 1. Manual release lever

[0047] 2 panels

[0048] 3. Distance sensor

[0049] 4. Retaining components

[0050] 5. Pins, especially fixed-spacing pins

[0051] 6 Magnets

[0052] 7. Housing components Detailed Implementation

[0053] like Figure 1 As shown, the motor has a rotor shaft that is rotatably supported by bearings housed in the motor housing.

[0054] Here, the housing has a housing component 7, which serves as the stator housing of the motor. Along the axial direction, i.e., along the rotation axis of the rotor shaft, two flanges are mounted on the housing component 7 on both sides, each of which accommodates one of the two bearings.

[0055] An electromagnetically operable brake is arranged on the side of the first flange that is away from the housing 7. The brake has a magnet 6, which is connected to the first flange in a manner that prevents relative rotation.

[0056] In magnet 6, particularly in the can-shaped or annular recess of magnet 6, a brake coil is provided, which can be supplied with current. The winding axis of the coil is arranged coaxially with the rotation axis of the rotor shaft.

[0057] The disc-shaped brake pad support is connected to the rotor shaft in a manner that prevents relative rotation. For this purpose, the brake pad support has internal teeth that mesh with external teeth on the rotor shaft or with the external teeth of a component connected to the rotor shaft in a manner that prevents relative rotation. The teeth of both the external and internal supports extend axially. Therefore, the brake pad support is arranged such that, although connected to the rotor shaft in a manner that prevents relative rotation, it is capable of axial movement.

[0058] The brake pad bracket has brake pads on both sides of the axial direction.

[0059] A ferromagnetic armature disk is provided axially between the brake pad bracket and the magnet 6. The armature disk is connected to the magnet 6 in a manner that prevents relative rotation but allows axial movement.

[0060] The brake pad support is axially positioned between the brake surface, which is particularly finely machined and formed on the first flange, and the armature disc.

[0061] When the coil is energized, the armature disk is attracted toward the magnet 6 against the spring force generated by the spring element supported on the magnet. Therefore, the brake pad support is spaced apart from the armature disk and the brake is released.

[0062] When no power is applied, the armature disc is pressed against the brake pad support by the spring element, causing the brake pads of the brake pad support to come into frictional contact with the armature disc or the brake surface. Thus, the brake is engaged.

[0063] To enable manual release, especially when no power is applied, a manual release lever is provided. This manual release lever 1 is arranged to be rotatable relative to the magnet 6 via a rotating support, wherein the axis of rotation of the rotating support is perpendicular to the axis of rotation of the rotor shaft.

[0064] One end region of the manual release lever 1 is connected to a limiting member, in particular a bolt, via a hinge, which can move linearly in the axial direction depending on the rotational position of the manual release lever 1.

[0065] The limiting member extends through the magnet 6 and through the armature disk, and widens at its end away from the magnet, particularly in the radial direction. Therefore, in the first rotational position of the manual release lever and thus in the first axial position of the limiting member, the working stroke of the armature disk is not limited by the limiting member, while in the second rotational position of the manual release lever and thus in the second axial position of the limiting member, the armature disk is axially limited.

[0066] In this way, the brake can be engaged or disengaged depending on energization in the first rotational position, and manual release can be caused in the second rotational position, in particular regardless of whether the brake coil is energized or not.

[0067] The retaining member 4 is held spaced apart from the housing member 7 by means of pins 5, particularly spacer pins. Here, pins 5 are either fixed in the housing member 7 or fixed to the first flange. A distance sensor 3 is fixed to the retaining member 4, which determines the distance between the plate member 2 fixed to the manual release lever 1 and the distance sensor 3. The distance determined in the first rotational position of the manual release lever 1 differs from the distance determined in the second rotational position.

[0068] If the distance detected by distance sensor 3 is lower than the first threshold, the manual release lever 1 is in the first rotation position and the brake is in normal operation, that is, the brake is released or engaged according to the energization of the coil.

[0069] If the distance detected by distance sensor 3 exceeds a second threshold greater than the first threshold, then manual release lever 1 is in the second rotation position and manual release operation is performed, that is, the brake is manually released.

[0070] Therefore, the operating status is monitored by monitoring the distance between the distance sensor and the manual release lever. The distance sensor 3 is connected to the electronic circuitry, particularly the converter that powers the motor. The energization of the brake coil is controlled by the electronic circuitry. Therefore, the electronic circuitry is configured to allow the coil to be driven, i.e., energized, only when the manual release lever 1 is in a first rotational position, i.e., when the distance value detected by the distance sensor 3 is below a first threshold. However, if the detected distance value exceeds a second threshold, energizing the brake coil is not permitted.

[0071] Furthermore, it can also identify whether the manual release lever 1 is operated during the corresponding operating state. For example, a warning is issued when the brake coil is energized but the manual release lever is in the second rotation position, i.e., the detected distance value exceeds the second threshold.

[0072] Furthermore, during the transition from the second rotation position to the first rotation position—that is, from manual release operation to normal operation of the brake—detecting this transition ensures that, especially when the brake has left the second rotation position (i.e., below the second threshold), but particularly in any case, from below the first threshold, the coil is energized, and thus the brake is released by the energization of the coil. This prevents the brake from engaging directly when the manual release lever moves from the second rotation position to the first rotation position.

[0073] Preferably, the pin 5 is axially oriented, and the plate 2 extends in the circumferential direction and covers only one position in the axial direction.

Claims

1. A motor having an electromagnetically operable brake, The brake has a manual release lever. In the first rotational position of the manual release lever, the brake is released or engaged depending on whether the brake coil is energized or not. In the second rotational position of the manual release lever, the brake is released regardless of whether the brake coil is energized or not. Its features are, A distance sensor is arranged on the motor to detect the rotational position of the manual release lever. The distance detected by the distance sensor, either between the distance sensor and the manual release lever or between the distance sensor and a plate connected to the manual release lever, is smaller in the first rotational position of the manual release lever than in the second rotational position. The distance detected by the distance sensor is set in the axial direction. A distance sensor is connected to an electronic circuit that is configured to allow energization of the coil only when the manual release lever is in a first rotational position, i.e., when the distance value detected by the distance sensor is below a first threshold. If the detected distance value exceeds a second threshold, energization of the brake coil is not allowed. A warning is issued when the brake coil is energized but the manual release lever is in the second rotation position, i.e., when the detected distance exceeds the second threshold. When transitioning from the second rotation position to the first rotation position, that is, from manual release operation of the brake to normal operation, the coil is energized when the second rotation position has been left, and the brake is released by the energization of the coil.

2. The motor according to claim 1, characterized in that, The manual release lever is supported in a manner that allows it to rotate about a rotation axis, which is radially oriented with reference to the rotation axis of the motor's rotor shaft.

3. The motor according to claim 1, characterized in that, The distance sensor is connected to and held by the retaining element. The retainer is held apart from the first flange of the motor by means of a pin.

4. The motor according to claim 3, characterized in that, The pin is oriented axially and spaced apart from the distance sensor in the circumferential direction.

5. The motor according to any one of claims 1-4, characterized in that, The plate connected to the manual release lever is a flat plate, and the normal of the flat plate is parallel to the axial direction.

6. The motor according to any one of claims 1-4, characterized in that, The circumferential angle region covered by the distance sensor in the circumferential direction with reference to the rotation axis of the rotor shaft is spaced apart from the circumferential angle region covered by the manual release lever in the circumferential direction. The manual release lever and the distance sensor cover the same radial distance region. The distance sensor covers the cylindrical spatial volume and the axis of the cylinder is oriented parallel to the axial direction.

7. The motor according to any one of claims 1-4, characterized in that, The manual release lever is connected to a limiting member via a hinge. This limiting member is configured to move in the axial direction and serves as an axial limiting part of the armature disc of the brake.

8. The motor according to any one of claims 1-4, characterized in that, The armature disc is arranged such that it cannot rotate relative to the brake magnet and / or relative to the motor housing, but can move axially. The brake pad support is connected to the rotor shaft in a manner that prevents relative rotation but allows axial movement. The armature disk is arranged axially between the magnet and the brake pad support. A coil is housed in the recess of the magnet. The brake pad support is arranged axially between the brake surface formed on the flange and the armature disc.

9. The motor according to claim 7, characterized in that, When the manual release lever is in the first rotation position When the coil is energized, the armature disk is pulled toward the magnet against the spring force generated by the spring element. When the coil is not energized, the armature disc is pressed against the brake pad bracket by the spring element; When the manual release lever is in the second rotation position The armature disk and the coil remain pressed toward the magnet by the restraint regardless of whether they are energized or not.

10. The motor according to any one of claims 1-4, characterized in that, The magnet and the flange are connected in a manner that prevents them from rotating relative to each other.

11. A drive device having a motor according to any one of claims 1-10, characterized in that, An inverter, including the aforementioned electronic circuitry, supplies power to the motor.

12. A method for operating a drive device having a motor according to any one of claims 1-10, characterized in that, After detecting the transition of the manual release lever from the second rotation position to the first rotation position, that is, the transition of the brake from manual release operation to normal operation, the coil is energized when the lever has left the second rotation position, thereby releasing the brake through the energization of the coil.

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