DE102008028661B4 - Electric motor comprising a rotor having a shaft, a housing and an encoder - Google Patents

Abstract

Electric motor (50), which comprises a rotor (1) having a shaft (66), a housing and a transmitter (219), the shaft (66) being mounted in the housing by means of a fixed bearing (11) and a floating bearing (44). ,wherein the floating bearing (44) is arranged to be axially movable and the shaft (66) has shaft sections with different diameters, whereby the transitions of the shaft sections form shaft diameter steps, with a spring element (41) designed as a plate spring axially between the floating bearing (44) and a housing part is arranged, wherein at least one ring of the floating bearing (44) is pressed by the spring element (41) against a shaft diameter step, a pressing force generated by the spring element (41) being smaller than a maximum axial force that can be absorbed by the floating bearing (44), the housing being a A stator housing (52) surrounding a stator (16), which has cooling fins (54) projecting parallel to one another radially from the stator housing (52), free ends of the cooling fins (54) lying approximately in a flat surface, the housing, a sensor attachment element and the encoder (219) are arranged one behind the other in the axial direction of the housing, the encoder (219) being attached to the housing by means of the encoder attachment element, the encoder attachment element tapering like a bottleneck in a partial area in the axial direction from the housing to the encoder (219) and the partial area having slot-like through openings has, the encoder attachment element being slipped onto the bearing plate (42), the outer diameter of the partial area tapering from a diameter of the housing to a diameter of a encoder housing (220), with a torque support for a encoder housing (220) at a encoder-side end of the encoder attachment element ). Encoder hood (361) has a recess in which a cable bushing is arranged.

Description

The invention relates to an electric motor which comprises a rotor having a shaft, a housing and a transmitter.

From the DE 10 2005 009 601 A1 an electric motor with encoder is known.

From the DE 102 38 336 A1 A motor series is known as the closest prior art.

From the DE 198 57 950 A1 an electric motor with an integrated, backlash-free, electromagnetically actuated brake is known.

From the DE 100 29 864 A1 a drive with an electric motor is known.

From the EP 1 011 188 B1 an electric motor with an integrated, backlash-free, electromagnetically actuated brake is known.

From the DE 100 42 106 A1 a drive device is known.

From the DE 103 24 621 A1 an electrical machine is known.

From the DE 20 2007 009 954 U1 an electric motor is known.

The invention is therefore based on the object of developing an electric motor with a sensor, whereby the electric motor with a sensor can be operated safely and reliably.

According to the invention, the object is achieved in the electric motor with encoder according to the features specified in claim 1 or 2.

Important features of the invention in the electric motor with encoder are that the electric motor comprises a rotor having a shaft, a housing and an encoder, the shaft being mounted in the housing by means of a fixed bearing and a floating bearing, the floating bearing being arranged to be axially movable and the Shaft, shaft section with different diameters, whereby the transitions of the shaft sections form shaft diameter steps, with a spring element designed as a plate spring being arranged axially between the floating bearing and a housing part, in particular a bearing plate, with at least one ring of the floating bearing being pressed by the spring element against a shaft diameter step, wherein a pressing force generated by the spring element is smaller than a maximum axial force that can be absorbed by the floating bearing, the housing comprising a stator housing surrounding a stator, which has cooling fins projecting radially from the stator housing parallel to one another, with free ends of at least two cooling fins lying approximately in a flat surface, in particular in four flat surfaces arranged approximately at right angles to one another, the housing, a transmitter attachment element and the encoder being arranged one behind the other in the axial direction of the housing, the encoder being attached to the housing by means of the encoder attachment element, the encoder attachment element extending in the axial direction from the housing to the encoder tapered like a bottleneck in a partial area and the partial area has slot-like through openings, the encoder attachment element being slipped onto the end shield, the outer diameter of the partial area tapering from a diameter of the housing to a diameter of a encoder housing, with a torque support for at a encoder-side end of the encoder attachment element a transmitter housing is arranged, with a fastening means for connecting a transmitter shaft to the shaft being arranged at the transmitter-side end of the shaft, a transmitter hood at least partially surrounding the transmitter to form a housing, the transmitter hood having a recess in which a cable bushing is arranged. The advantage here is that the encoder can be connected safely and reliably to the electric motor. Through the recesses in the encoder attachment element and in the encoder cover, all parts of the electric motor are cooled by a single fan. The special shape of the encoder attachment element leads to a reduction in the vibrations that occur and thus enables a safe and reliable connection between the encoder and the electric motor.

Important features of the invention in the electric motor with encoder are that the electric motor has a housing, a encoder and a encoder attachment element, the housing, the encoder attachment element and the encoder being arranged one behind the other in the axial direction of the housing, the encoder being attached to the housing by means of the encoder attachment element is attached, the encoder attachment element tapers like a bottleneck in a partial area in the axial direction from the housing to the encoder and the partial area has slot-like through openings. The advantage here is that the encoder can be connected safely and reliably to the electric motor. The special shape of the encoder attachment element leads to a reduction in the vibrations that occur and thus enables a safe and reliable connection between the encoder and the electric motor.

In a further advantageous embodiment, the outer diameter of the partial area tapers from a diameter of the housing to a diameter of a transmitter housing. The advantage here is that the encoder housing is secure and reliably with the encoder attachment element and the encoder attachment element can be securely and reliably connected to the housing of the electric motor. This means that the encoder can be connected to the electric motor safely and reliably.

In a further advantageous embodiment, a torque support for a sensor housing is arranged at a sensor-side end of the sensor attachment element. The advantage is that no additional torque support is necessary and the encoder can be mounted safely and reliably on the electric motor.

In a further advantageous embodiment, the electric motor comprises a shaft mounted in the housing, with a fastening means for connecting a sensor shaft to the shaft being arranged at the encoder end of the shaft. The advantage here is that different encoders can be connected safely and reliably to the electric motor via the fastening means.

In a further advantageous embodiment, the fastening means connects the shaft and the encoder shaft, which have different diameters. The advantage here is that encoders with different encoder shaft diameters can be connected safely and reliably to the shaft of the electric motor.

In a further advantageous embodiment, the fastening means is designed as a coupling which is connected to the shaft. The advantage here is that different encoders can be attached to the electric motor and sensitive structures in the encoder are also protected from torque changes in the shaft that destroy the encoder.

In a further advantageous embodiment, the encoder attachment element surrounds a brake and a fan of the electric motor to form a housing. The advantage here is that the encoder can be mounted safely and reliably on the electric motor, as the structure of the electric motor differs only slightly from the standard structure. Despite the sensor attachment, the fan is installed in the same way as an electric motor without a sensor and is supplied with sufficient air. The airflow generated by the fan is guided through the different areas of the electric motor and cools all areas efficiently.

In a further advantageous embodiment, the encoder attachment element is a cast part. The advantage here is that the Gerber attachment element is particularly stable and vibration-resistant, meaning that the encoder is mounted safely and reliably on the electric motor.

In a further advantageous embodiment, a transmitter hood surrounds the transmitter at least partially to form a housing. The advantage here is that the encoder is protected from external influences and is therefore securely and reliably attached to the electric motor.

In a further advantageous embodiment, the encoder cover has a recess in which a cable bushing is arranged. The advantage here is that the cable bushing has a vibration-damping effect and a sensor cable can be safely routed to an evaluation electronics and/or supply device. This means that the encoder is mounted safely and reliably on the electric motor.

In a further advantageous embodiment, the partial area tapers strictly monotonically and smoothly, that is, a function that describes the course of the taper is continuous and continuously differentiable. The advantage is that this shape is easy to manufacture and is particularly stable. This means that the encoder is mounted safely and reliably on the electric motor.

In a further advantageous embodiment, the encoder attachment element has a rotationally symmetrical surface in the partial area, into which the slot-like through openings are made. The advantage is that this shape is particularly stable and an air stream drawn in by the fan can flow easily to the fan.

Further advantages result from the subclaims. The invention is not limited to the combination of features of the claims. For the person skilled in the art, further sensible combination options of claims and/or individual claim features and/or features of the description and/or the figures arise, in particular from the task and/or the task posed by comparison with the prior art.

• In der 1 ist ein erfindungsgemäßer Elektromotor 50 in perspektivischer Aufsicht schematisch gezeigt. Der Elektromotor 50 weist ein annähernd zylinderförmiges Statorgehäuse 52 mit parallel zueinander stehenden, annähernd in radialer Richtung vom Statorgehäuse abstehende Kühlrippen 54 auf. Freie Enden der Kühlrippen 54 liegen annähernd in einer ebenen Fläche oder in einer gekrümmten Fläche, deren Krümmung kleiner ist, als die Krümmung des Statorgehäuses. Insbesondere liegen die freien Enden der Kühlrippen in vier annähernd rechtwinklig zueinander angeordneten Flächen. Trapezförmige Wulste 49 an den stirnseitigen Endbereichen an den Außenflächen des Statorgehäuses 52 bilden Eckelemente zwischen den ebenen Flächen. Die Außenflächen der jeweils äußersten Kühlrippen 54 der Flächen sind über eine einen gleichschenkligen rechten Winkel bildende Verdickung im Statorgehäuse 52 miteinander verbunden. In mindestens einer der ebenen Flächen ist in einer mehrere Kühlrippen 54 verbindenden Verdickung eine sacklochartige Befestigungsbohrung mit einem Innengewinde ausgeführt. Diese Befestigungsbohrung dient als Befestigungsmöglichkeit für verschiedene Anbauelemente, wie zum Beispiel eine Ringschraube 24, welche wiederum die Befestigung des Elektromotors 50 an einen Kranhaken erlaubt.

The invention will now be explained in more detail using illustrations:

• In the 1 an electric motor 50 according to the invention is shown schematically in a perspective view. The electric motor 50 has an approximately cylindrical stator housing 52 with cooling fins 54 which are parallel to one another and protrude approximately in the radial direction from the stator housing. Free ends of the cooling fins 54 lie approximately in a flat surface or in a curved surface whose curvature is smaller than the curvature of the stator housing. In particular, the free ends of the cooling fins lie in four surfaces arranged approximately at right angles to one another. Trapezoidal beads 49 at the front end Areas on the outer surfaces of the stator housing 52 form corner elements between the flat surfaces. The outer surfaces of the outermost cooling fins 54 of the surfaces are connected to one another via a thickening in the stator housing 52 that forms an isosceles right angle. In at least one of the flat surfaces, a blind hole-like fastening hole with an internal thread is made in a thickening connecting several cooling fins 54. This fastening hole serves as a fastening option for various attachment elements, such as an eyebolt 24, which in turn allows the electric motor 50 to be fastened to a crane hook.

A cuboid-shaped connection box 110 is screwed to a connection box base 67 provided for this purpose. The connection box base 67 is formed in one piece with the stator housing 52 and protrudes along the cooling fins 54 in an approximately radial direction beyond the free ends of the cooling fins 54. The connection box 110 has a connection box lower part 112 and a connection box cover 132, which is screwed to the connection box lower part 112 using a connection box hexagon screw 123.

A housing of the electric motor 50 includes a flange shield 64, a bearing shield 42 and the stator housing 52. The end faces of the stator housing 52 are separated from the bearing shield 42 and the flange shield 64 - except for a feedthrough for a shaft 66 in the flange shield 64 and a shaft feedthrough in the bearing shield 42 - locked. A flange 7 for flanging devices to be driven is formed on the flange shield 64. For this purpose, the flange 7 has a flange bore 8.

A cylinder screw 19 is guided through holes in trapezoidal beads on the edge of the end shield 42 and holes in the trapezoidal beads 49 on the stator housing 52 and screwed into a hexagon nut 17, so that the end shield 42 is attached to the stator housing 52. A hexagonal screw, which is guided through a through hole of a trapezoidal bead 49 on the flange shield side of the stator housing 52 and has a washer underneath, is screwed into an internal thread of a hole in a trapezoidal bead on the flange shield 64. The flange shield 64 and the end shield 42 are pressed against the end faces of the stator housing 52 in a rotationally fixed manner and, together with the stator housing 52, enclose a cylindrical interior of the housing of the electric motor 50.

The cylindrical interior of the housing is protected from contamination, such as dust, water and/or gear oil, in the passage for the shaft 66 in the flange shield 64 by a splash disk 107 and a shaft sealing ring 106. A device to be driven, such as a gearbox, can be flange-mounted on the flange 7. A rotating part of these devices to be driven can be fastened to the shaft 66 in a rotationally fixed manner, in particular can be fastened in a form-fitting manner by means of a feather key.

A fan cover 35 is attached to the circumference of the end shield 42 or is partially slipped over the end shield 42 in an axial direction. A circumferential wall of the fan cover 35 has a first section formed parallel to the axial direction of the shaft 66 and a second section which tapers in a bottleneck shape with respect to the axial direction of the shaft 66 and has an approximately circular cross section.

The first section has a corresponding circumference suitable for partially overlapping the end shield 42. A cross section of the first section is approximately square with rounded corners. On the inside of the fan cover, thickenings corresponding to the trapezoidal ridges of the end shield are formed. These thickenings have axially extending blind holes with internal threads that are open towards the end shield. These blind holes correspond to through holes in the trapezoidal beads of the end shield, which are exposed when the end shield 42 is mounted on the stator housing 52. Fan cover fastening screws are guided through these exposed through holes and screwed into the internal threads in the thickenings in the fan cover 35. An elongated hole is arranged in a wall section of the rounded corners of the first section. Inside the fan cover 35, a release lever part is provided below the elongated hole, into which a hand lever can be screwed in order to release a brake 550 of the electric motor 50 by hand. The first section also has recesses which can be closed by corresponding parts. These recesses serve to ensure accessibility for maintenance or adjustment of components of the electric motor 50 arranged underneath.

A projection is formed on a subsection of the second section, which adjoins the first section, onto which a sensor cover 361 is pushed. A screw for the encoder hood 361 is guided through a suitable recess in the encoder hood 361 and screwed into a radially extending internal thread of the projection.

The encoder hood 361 has the shape of a square shell with rounded corners. The encoder cover 361 is similar to the fan cover 35 and is divided into a first and a second section. The second section also converges in a funnel shape, but retains the square cross section with rounded corners. The encoder hood 361 is closed by a base with a recess, in particular several recesses, which are formed by a lattice structure.

The first section of the encoder hood 361 has a slot-like recess in a side wall into which a grommet 269 is inserted. The grommet is designed as a tubular, elastic, accordion-like cable gland.

The second section of the encoder hood 361 has approximately wave-shaped elevations and depressions.

2 shows the in 1 shown electric motor 50 according to the invention in a schematic longitudinal section.

The stator 16 with the stator windings 20 with winding head 21 and the stator laminated core 18 is fixed in the stator housing 52 with fastening means 80, in particular pressed into the stator housing 52.

The rotor 1 has a shaft 66 and a rotor package 72. The shaft 66 has several shaft sections with different diameters in the axial direction. The transitions between the shaft sections form several shaft diameter levels due to the different diameters. The rotor package 72 is arranged in a rotationally fixed manner approximately centrally on the shaft 66 in the shaft section with the largest shaft diameter, in particular pressed onto this shaft section. The rotor package 72 pressed onto the shaft 66 has a rotor laminated core 74. Sheets of the rotor laminated core 74 are connected to one another, for example by stamping and/or by a rotor casting 76 forming a short-circuit cage of the rotor 1. The rotor casting 76, forming an annular bead, stands on both sides in the axial direction of the shaft 66 over the rotor laminated core 74 before.

The shaft 66 is mounted relative to the housing with a fixed bearing 11 and a floating bearing 44, which are designed as deep groove ball bearings. The fixed bearing 11 is pushed onto the shaft 66 on the flange shield side and an inner ring of the fixed bearing 11 is axially fixed on the shaft side by a locking ring 10 with a support disk 104 and a shaft diameter step. The locking ring 10 is snapped into an annular groove in the shaft 66. On the housing side, the fixed bearing 11 is held by a ring-shaped corner of a fixed bearing holder formed in the flange shield 64 and by the locking ring 12 for a bore. The locking ring 12 for a hole is snapped into a groove in the fixed bearing holder in the flange shield 64.

On the end shield side, the floating bearing 44 is pushed onto the shaft 66 up to a further shaft diameter level. Because the inner ring of the floating bearing 44 rests with its end face on the stator housing side against a radial surface of a further shaft diameter step, the floating bearing 44 is supported on the shaft side towards the rotor packet 72. The end shield 42 forms a thickening in the area of the shaft bushing. The thickening is shaped towards the stator housing 52. A hollow cylinder in the thickening of the end shield 42, which is completely open towards the stator housing, is shaped more concentrically for the shaft bushing with a larger diameter than the shaft bushing and forms a cylindrical bearing holder for the floating bearing 44.

The floating bearing 44 is arranged in the cylindrical bearing holder. An annular spring element 41, preferably designed as a plate spring, is arranged between the floating bearing 44 and the end shield 42 in the bearing receptacle in the end shield 42. An outer ring of the floating bearing 44 is supported via the spring element 41 on a support surface in the end shield. This support surface must absorb a spring force of the spring element in the axial direction. An outer ring diameter of the spring element 41 is larger than a diameter of the shaft bushing and smaller than or equal to a diameter of the cylindrical bearing holder. An inner opening diameter of the annular spring element 41 is at least as large as the shaft diameter of the shaft 66 in the area of the cylindrical bearing holder.

In this way, the floating bearing 44 is fixed to be movable in the axial direction. Movable in the sense that the floating bearing 44 can follow axial displacements of the further shaft diameter level due to a change in the length of the shaft 66. The compensating disk 41 springs accordingly without deforming the floating bearing 44 or adversely changing the bearing properties. When there is an axial change in length of the shaft 66 between the fixed bearing 11 and the floating bearing 44, the floating bearing 44 follows the movement of the shaft diameter step and the inner ring of the floating bearing 44 remains pressed against a radial surface of the shaft diameter step due to the spring force of the spring element 41. In this way, for example, thermally caused changes in length of the shaft 66 or manufacturing tolerances of the shaft 66 and the bearing holder are recorded.

Since an outer ring and an inner ring of the fixed bearing 11 are axially fixed, the floating bearing 44 does not have to absorb any axial forces acting on the shaft 66 from the outside. The floating bearing can therefore be dimensioned as a smaller bearing and the electric motor is more compact.

A thickened outer edge of the end shield 42 is also shaped towards the stator housing 52.

A driver 70 is connected in a rotationally fixed manner to the shaft 66 by a driver feather key 71, which can be inserted into a corresponding feather key groove in the shaft 66, for example in a non-positive and/or in particular form-fitting manner. Axially, the driver 70 lies between the floating bearing 42 and a locking ring 62 for the driver 70. The inner ring of the floating bearing 44 is axially fixed by the further shaft diameter step and the driver 70. Therefore, the spring element 41 can also be omitted. The driver 70 in turn is axially fixed by the locking ring 62 for the driver, which is locked in a circumferential annular groove of the shaft 66.

The driver 70 is designed as a cylindrical gear, with an outer ring gear being formed only on a brake-side section of the driver 70. On the end shield side, the driver has a circumferential ring on which is spaced from the ring gear by a circumferential groove. The end shield-side ring of the driver 70 lies within the shaft bushing of the end shield 42 and almost completely closes the annular opening between the shaft 66 and the end shield 42.

In an end shield-side end section of the shaft 66, a fan wheel 36 is attached to the shaft 66 in a rotationally fixed manner, in particular in a form-fitting manner, such as with a flattening in the shaft cross section or a fan wheel key 31. In the axial direction, the fan wheel 36 is provided with an additional shaft diameter step and another Circlip 32 fixed positively and/or non-positively.

A stator 16 has a stator laminated core 18 and a stator winding 20 with a winding head 21 and is fastened in the stator housing 52.

A terminal plate 115 is attached to the connection box base 67 by means of another screw 113. The terminal plate 115 has at least one threaded rod designed as a connecting bolt with a screw nut and a washer that can be screwed onto the threaded rod. In the stator housing 52, in the area of the connection box base 67, there are cable bushings for intended connection lines, such as connection lines for the stator winding 20. An inner corner of the connection box base 67 is reinforced in an approximately cylindrical shape. A blind hole with an internal thread is incorporated into this reinforcement. Fastening screws 119 screwed into these reinforcements fix the lower connection box part 112 to the connection box base 67. A seal 111 for the lower connection box part 112 is clamped between the lower connection box part 112 and the connection box base 67. There are cable bushings of different sizes in a wall of the terminal box base 112.

The terminal box lower part 112 protrudes on the end shield side in a terminal box area beyond the terminal box base 67 and the end shield 42 and forms a base plate in this terminal box area. Various clamping devices are located on this base plate, protruding into the interior of the terminal box base 112.

Furthermore, a cuboid-shaped elevation projects from the base plate into the interior of the connection box 110. A clamping threaded rod 117 is screwed into this increase. A clamping nut 319 is screwed onto the clamping threaded rod 117, whereby a spring ring 118 and a clamping washer 116 can be pressed onto the elevation.

Towards the connection box base 67, the connection box lower part 112 forms a frame corresponding to an end face of the connection box base 67. A seal 111 for the lower terminal box part 112 is clamped between the frame and the end face. In the four corners of the frame there are through holes for fastening screws 119 for attaching the terminal box lower part 112 to the terminal box base 67.

The terminal plate 115 and the various clamping devices can be used for the electrical connection of external lines supplied from the outside with the lines supplied from the electric motor 50 into the connection box 110, such as the lines led from the stator winding 20. The connection box 110 is closed with a connection box cover 132 and a seal 131 for the connection box cover 132 clamped between the connection box cover 132 and the connection box lower part 112. For this purpose, the connection box cover 132 is screwed to the connection box lower part 112 with the connection box hexagon screws 123.

The terminal plate 115 and the various clamping devices are for electrical distribution Binding of external lines supplied from the outside with the lines supplied from the electric motor 50 into the connection box 110, such as the lines led from the stator winding 20, is provided.

A brake 550 is arranged around the shaft on the end shield 42. The brake 550 includes a brake shield 702, a pad carrier 168 and a magnet body 154, which are assembled by means of a brake mounting screw 160 and a brake mounting nut 161. This assembly takes place independently of the remaining electric motor 50 and before the brake 550 is installed. It is therefore a pre-completed brake 550. The pre-completed brake 550 is completely plugged onto the driver 70 or onto the shaft 66, with slight back and forth Turning the shaft 66 or the pre-completed brake 550, the brake 550 is first joined and then screwed.

The brake shield 702 is screwed to the end shield 42 using brake fastening screws. The plate-shaped brake shield 702, which is provided with radial, radial reinforcements, has a smaller outer diameter than the end shield 42. The peripheral region shaped towards the end shield 42 radially overlaps an annular circumferential protuberance on the outer end face of the end shield 42 lying outside the housing, as a result of which the brake shield 702 is approximately centered around the shaft 66. This makes it easier to assemble the brake shield 702 and thus the pre-completed brake 550.

Trapezoidal protrusions with axial through holes are formed on the peripheral area of the brake shield 702, which is shaped towards the end shield 42, through which the brake fastening screws are guided. A brake seal is approximately the same shape as an end face of an outer circumference of the brake shield 702 and is clamped between the end face of the brake shield 702 and the end shield 42.

A disk-like portion of the outer end face of the brake shield 702 serves as a friction pad for an annular brake lining 169 of the lining carrier 168. The lining carrier has internal teeth which engage in an axially movable manner in a toothing of the toothed ring of the driver 70. The lining carrier is arranged between the brake shield and the magnet body 154 and lies in a lining area that is delimited by the brake shield 702 and the magnet body 154.

The lining carrier 168 comprises two metal disks, preferably made of aluminum, which are connected to one another, separated by a damping material. The damping material reduces an intensity of noise generated when the brake 550 is applied. The annular brake pad 169 is arranged concentrically around the shaft 66 on the metal disk directed towards the brake shield 702. Another brake pad is arranged on the opposite metal disc directed towards the magnet body 154. The internal teeth of the lining carrier 168 engage in the ring gear of the driver 70.

In the magnet body 154 blind holes are arranged in the axial direction which are open towards the lining carrier. In these blind holes in the magnet body 154, helical compression springs are inserted, which press the armature disk 149 against the lining carrier 168 or the other brake lining when the brake 550 is engaged, as a result of which the brake lining 169 presses against the disk-like portion of the end face of the brake shield 702 due to the axial mobility of the lining carrier 168.

In a further embodiment, the lining carrier 168 is made in one piece with the brake lining 169. The lining carrier 168 and the brake lining 169 are then made from the same material, preferably from a homogeneous or heterogeneous composite material such as fiber-reinforced hard plastic.

A coil 155 is arranged in the magnet body 154, which magnetizes the magnet body 154 when current flows through the coil 155, whereby the armature disk 149 is attracted to the magnet body 154 against the force of the helical compression springs. The brake 550 is released when current flows through the coil 155 and the shaft 66 can be driven or moved without a brake. In order to dampen the noise generated when the armature disk 149 striking the magnet body 154 is ventilated, a disk-shaped damping plate 718 is arranged between the magnet body 154 and the armature disk 149. An annular opening between the shaft 66 and the magnet body 154 is sealed by a shaft seal 30.

The shaft seal 30 is followed in the axial direction away from the housing by a release lever 53, which rests on the end face of the magnet body facing away from the housing, since the release lever 53 is attached to the armature disk 149 by means of the release pin screw 56 and the adjusting nut 58.

The release lever 53 for releasing the brake 550 is supported on the magnet body via a cylindrical pin and is arranged on the end face of the magnet body 154 facing away from the brake shield. In an axial plan view, the release lever has the shape of a riding spur, the legs of which surround the Grab shaft 66. There are two through openings arranged symmetrically in the legs of the riding spur. An air pin screw 56 is guided through a through opening and is further guided through an opening in the magnet body. The air pin screw 56 is screwed with one end region to the armature disk 149 of the brake 550, which is arranged between the magnet body 154 and the lining carrier 168. The release lever is held on the magnet body with the help of a conical spring and an adjusting nut 58 at the other end region of the release pin screw 56.

Between the bottleneck-like portion of the fan cover 35 and the release lever 53, the fan wheel 36 is fastened to the shaft 66 in a rotationally fixed manner at a distance from the release lever 53. The fan wheel 36 has a radially projecting fan disk which forms a truncated cone jacket with its base surface open towards the end shield 42. A radially extending fan blade 38 projects axially towards the bottom of the fan cover 35 on the side of the fan disk facing away from the housing, approximately perpendicular to the fan disk. The fan disk merges radially towards the shaft 66 into a U-shaped fastening area 37 of the fan wheel 36. An innermost edge of the fastening area 37 forms the inner casing of a fan wheel cylinder, which is in contact with the shaft 66. The shaft-side leg of the U of the fastening area is clamped by the further shaft diameter step of the shaft 66 and the further locking ring 32. The fan wheel 36 is thus fastened in the axial direction.

The fan wheel 36 is preferably formed in one piece from a lightweight material such as plastic or aluminum. If an increased moment of inertia is required, a heavier fan wheel made of die-cast or steel can be installed.

The fan cover 35 surrounds the fan wheel 35, the brake 550 and the end shield 42, forming a housing. The bottleneck-like tapering portion has slot-like through openings which run in the axial direction. The taper of the partial area is preferably strictly monotonous and smooth, i.e. continuous and continuously differentiable. In particular, the partial area has a rotationally symmetrical surface into which the slot-like through openings are introduced. The lateral surface of the tapering portion is preferably designed approximately as a hyperboloid.

The section, which tapers like a bottleneck, merges into the end region of the fan cover 35 facing away from the housing. The end region is designed as a receptacle for an encoder 219 that can be connected to the shaft 66. A transmitter housing 220 is at least partially inserted into the end region of the fan cover 35. The encoder housing 220 is connected to the fan cover in a rotationally fixed manner, for example via a positive or non-positive connection. The fan cover 35 therefore also serves as a sensor attachment element.

A encoder shaft is connected to the shaft 66 via a clutch 233. The clutch 233 is rotatably connected to the shaft 66 by means of an expansion shaft in a recess in the shaft 66. The coupling serves to protect the angle measuring system of the encoder 219 from torque changes of the shaft 66 that destroy the angle measuring system.

The end face of the encoder housing 220 facing away from the coupling is covered by an end cover 619 with a cable feedthrough. This cable gland protrudes radially.

The encoder 219 is surrounded by the encoder hood 361 to form a housing. The grommet 269 in the encoder cover 361 sits in the radial extension of the cable gland of the end cover 619.

Reference symbol list

1

rotor

7

flange

8th

flange hole

10

Circlip

11

fixed camp

12

Circlip for hole

16

stator

17

Hex nut

18

Stator lamination package

19

cylinder head screw

20

Stator winding

21

winding head

22

another hexagon screw

24

Eyebolt

31

Fan key

30

Shaft seal

32

another locking ring

35

Fan cover

36

Fan wheel

38

Fan blade

41

Spring element

42

Bearing shield

44

Floating bearing

49

trapezoidal bead

50

Electric motor

52

Stator housing

53

Air lever

54

cooling fins

56

Air pin screw

58

Release hexagon nut

59

Air cylinder pin

62

Circlip

64

flange shield

66

Wave

67

Junction box base

70

taker

71

Driver key

72

Rotor pack

74

Rotor lamination package

76

Rotor casting

80

Fasteners

104

Support disk

106

shaft seal

107

Splash disk

110

Junction box

111

Seal for the lower part of the connection box

112

Connection box base

113

another screw

115

Terminal plate

116

Clamping disc

117

Clamping threaded rod

118

spring ring

119

Fastening screw

123

Junction box hexagon screw

131

Seal for the connection box cover

132

Terminal box cover

149

Armature disc

154

Magnetic body

155

Kitchen sink

161

Brake mounting screw

168

Pad carrier

169

brake pad

219

giver

220

Encoder housing

233

coupling

269

grommet

361

donor cover

319

clamping nut

550

brake

619

Connection cover

718

Damping plate

Claims (13)

Electric motor (50), which comprises a rotor (1) having a shaft (66), a housing and a transmitter (219), the shaft (66) being mounted in the housing by means of a fixed bearing (11) and a floating bearing (44). , wherein the floating bearing (44) is arranged to be axially movable and the shaft (66) has shaft sections with different diameters, whereby the transitions of the shaft sections form shaft diameter steps, with a spring element (41) designed as a plate spring axially between the floating bearing (44) and a housing part is arranged, wherein at least one ring of the floating bearing (44) is pressed by the spring element (41) against a shaft diameter step, wherein a pressing force generated by the spring element (41) is smaller than a maximum axial force that can be absorbed by the floating bearing (44), the housing being a A stator housing (52) surrounding a stator (16) which has cooling fins (54) projecting parallel to one another radially from the stator housing (52), free ends of the cooling fins (54) lying approximately in a flat surface, the housing, a sensor attachment element and the encoder (219) are arranged one behind the other in the axial direction of the housing, the encoder (219) being attached to the housing by means of the encoder attachment element, the encoder attachment element tapering like a bottleneck in a partial area in the axial direction from the housing to the encoder (219) and the partial area has slot-like through openings, the encoder attachment element being slipped onto the bearing plate (42), the outer diameter of the partial area tapering from a diameter of the housing to a diameter of a encoder housing (220), with a torque support for a encoder attachment at an encoder-side end of the encoder attachment element Encoder housing (220) is arranged, with a fastening means (80) for connecting a encoder shaft to the shaft (66) being arranged at the encoder-side end of the shaft (66), with an encoder hood (361) at least partially surrounding the encoder (219) forming a housing , wherein the encoder cover (361) has a recess in which a cable bushing is arranged. Electric motor (50), which has a housing, a transmitter (219) and a transmitter attachment element, the housing, the encoder attachment element and the encoder (219) being arranged one behind the other in the axial direction of the housing, characterized in that the encoder (219) by means of Encoder attachment element is attached to the housing, the encoder attachment element tapers like a bottleneck in a partial area in the axial direction from the housing to the encoder (219) and the partial area has slot-like through openings. Electric motor (50). Claim 2 , characterized in that the outer diameter of the partial area tapers from a diameter of the housing to a diameter of a transmitter housing (220). Electric motor (50). Claim 2 or 3 , characterized in that a torque support for a sensor housing (220) is arranged at a sensor-side end of the sensor attachment element. Electric motor (50) according to one of the Claims 2 until 4 , characterized in that the electric motor (50) comprises a shaft (66) mounted in the housing, at the encoder end of the shaft (66) a fastening means (80) for connecting a encoder shaft to the shaft (66) is arranged. Electric motor (50). Claim 5 , characterized in that the fastening means (80) connects the shaft (66) and the encoder shaft, which have different diameters. Electric motor (50). Claim 5 or 6 , characterized in that the fastening means (80) is designed as a coupling (233) which is connected to the shaft (66). Electric motor (50) according to one of the Claims 2 until 7 , characterized in that the encoder attachment element surrounds a brake (550) and a fan of the electric motor (50) to form a housing. Electric motor (50) according to one of the Claims 2 until 8th , characterized in that the encoder attachment element is a cast part. Electric motor (50) according to one of the Claims 2 until 9 , characterized in that a transmitter hood (361) at least partially surrounds the transmitter (219) to form a housing. Electric motor (50). Claim 10 , characterized in that the encoder cover (361) has a recess in which a cable bushing is arranged. Electric motor (50) according to one of the Claims 2 until 11 , characterized in that the subarea tapers in a strictly monotonous and smooth manner, i.e., continuously and continuously differentiable. Electric motor (50) according to one of the Claims 2 until 12 , characterized in that the encoder attachment element has a rotationally symmetrical surface in the partial area, into which the slot-like through openings are introduced.

Images