Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
  • H02K11/21—Devices for sensing speed or position, or actuated thereby
  • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
  • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
  • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields

Definitions

• the invention relates to a brushless electric machine, in particular a brushless DC motor, with a housing, with at least one rotor, which is arranged on a rotatably mounted in the housing shaft, and with a housing fixed stator and a
• Rotor bearing detection device associated with the rotor.
• Rotor position detection devices are preferably used for this purpose
• a magnetic field transmitter is arranged on the front side of the shaft of the rotor and a magnetic field-sensitive sensor arranged axially or in further seduction of the shaft facing its front side.
• the detected magnetic field changes, whereby the rotational angle position or the rotor position of the rotor can be determined by means of a corresponding evaluation of the sensor output signal.
• the machine according to the invention with the features of claim 1 has the advantage that a particularly accurate and rapid detection of the rotor position is possible, and that space advantages arise.
• the invention provides that the rotor detection device has a rotatably arranged on the shaft or can be arranged multi-pole magnetic ring and at least one radially to the outer periphery of the magnetic ring associated magnetic field-sensitive sensor.
• the invention thus provides that the magnetic field-sensitive sensor is not assigned to the end face or axially of the shaft and the magnetic field transmitter, but radially to the magnetic ring, so that the sensor is ultimately arranged axially at the level of the shaft. This results in that the machine can be built axially shorter overall.
• the rotor position detection device can in principle be arranged on any desired axial section of the shaft, and thus for example also between a shaft bearing and the rotor arranged on the shaft. This results in a design freedom that allows optimal use and optimal design of the electrical machine depending on the existing conditions.
• the senor is designed as a TMR sensor.
• TMR sensors use the principle of magnetic tunnel resistance (TMR). Such a sensor is manufactured in thin-film technologies and allows a highly accurate magnetic field sensing in a small space.
• the senor is oriented such that it has a measuring direction for detecting magnetic fields at an angle other than a perpendicular orientation to the axis of rotation of the
• Main axis of the main measuring direction of the sensor understood.
• the oblique alignment of the main axis or the measuring direction of the sensor ensures that a homogeneous signal is produced at the signal output of the sensor.
• the TMR sensor has a plurality of measuring elements which are interconnected in a TMR bridge on a measuring plate. The perpendicular to the measuring plate thereby represents the main measuring direction In this case, then, the measuring plate is arranged such that its vertical deviates from an exactly radial orientation.
• the magnetic ring has a plurality of magnetic poles with alternating magnetic field orientation distributed over the circumference, which are in particular distributed uniformly over the circumference.
• magnetic poles are hereby
• the magnetic ring is arranged on a pushed onto the shaft magnetic carrier.
• the magnetic ring is not attached directly to the shaft, but held by the magnetic ring carrier at this. This ensures that the magnetic ring is easy and can be mounted on the shaft in a short time.
• a highly accurate arrangement of the magnet ring on the shaft is possible, wherein the same magnetic ring can be arranged on differently configured waves or shaft sections of a shaft by the magnetic ring carrier.
• the magnetic ring carrier has a bursting protection comprising the magnetic ring on its outer circumference.
• the magnetic ring carrier in particular has a jacket wall which surrounds or surrounds the magnetic ring on its outer circumference.
• the burst protection ensures that in the event that the magnetic ring should break, no parts of the magnetic ring are thrown into the environment at high speed. This protects the electrical machine against further damage.
• the magnetic ring is protected by the burst protection itself from external influences, so that the risk of damage to the magnetic ring itself is also reduced.
• the magnetic ring carrier is formed cup-shaped. As a result, the burst protection automatically by the Mantle wall formed. According to a preferred embodiment of the invention it is provided that the magnetic ring carrier also has an internal
• Mantle wall of the cup-shaped magnetic carrier has, which is associated with the inner circumference of the magnetic ring, so that the magnetic ring is protected or worn on the inside by the inner jacket wall of the magnetic ring carrier.
• the magnetic ring carrier at least one positive
• Anti-rotation lock forms with the shaft.
• the rotation is formed, for example, by an axially or longitudinally extending groove on the outer circumference of the shaft and engaging in the groove driving projection which is fixedly connected to the magnetic ring or in particular integrally formed therewith.
• a plurality of such groove-driving projection pairs or anti-rotation are formed distributed over the circumference of the magnetic ring carrier and the shaft to ensure a rotational drive and a variable orientation of the magnetic ring carrier on the shaft.
• FIG. 1 shows a brushless electric machine in a simplified
• Figure 2 is a detail view of the machine in a perspective
• FIG. 3 shows a second detail view of the machine in a perspective view
• FIG. 1 shows in a simplified longitudinal sectional illustration a brushless DC motor 1 which has a housing 2 in which a shaft 3 is rotatably mounted.
• the bearing of the shaft 3 is presently realized by a plurality WälzShava 4, of which only one example is shown here.
• a rotor 5 is arranged and rotatably connected to the shaft 3.
• the rotor 5 is coaxially associated with a stator 6, which is fixed to the housing or disposed on the housing 2.
• the stator 6 and a coil of the stator 6 can be energized to enable the rotor 5 in a rotational movement with the predetermined torque.
• a rotor position detection device 7 is provided, by means of which the current angular position of the rotor 5 with respect to the stator 6 is monitored.
• the rotor bearing detection device 7 has a magnetic ring 8, which is a plurality of uniform over its circumference and with alternating
• Magnetic field orientation distributed magnetic poles N and S has.
• the magnetic ring 8 is held on a magnetic ring carrier 9.
• the magnetic ring 9 is also annular and thus has a central
• the inner diameter of the opening 10 and the outer diameter 3 are formed in the Aufschiebe Scheme such that a virtually backlash fit or a press fit is formed when pushed to ensure a secure holding the magnetic ring carrier 9 on the shaft 3.
• At least one anti-rotation 11 is formed between the magnetic ring carrier 9 and the shaft 3. This is according to the present embodiment by a formed in the outer periphery of the shaft 3 and a groove 2 formed by the magnetic ring carrier 9 driving projection 13 which engages in the groove 12
• the driving projection 13, in particular in the circumferential direction, is free of play in the groove 12.
• a plurality of such anti-rotation 11 are distributed over the circumference of magnetic ring carrier 9 and shaft 3 or arranged.
• the shaft 3 has a plurality of the grooves 12, so that the magnetic ring carrier 9 can be pushed onto the shaft 3 in a plurality of rotational angle positions.
• the respective groove 12 is axially open
• the magnetic ring carrier 9 has an outer casing wall 14, which comprises the magnetic ring 8 on its outer circumference. Should this be damaged in operation and break, so items of magnetic ring are collected by the burst protection 15 and are not thrown into the interior of the housing 2, where they could cause further damage.
• the magnet ring carrier 9 has an inner casing wall 16 which at least axially surrounds the inner circumference of the magnet ring 8 so that the magnet ring 8 is held on the magnet ring carrier 9 between the casing outer wall 14 and the casing wall 16.
• the magnetic ring carrier 9 as a whole acquires a cup-shaped form into which the magnetic ring 8 can be easily inserted axially.
• a magnetic field-sensitive sensor 17 is further arranged and radially associated with the outer circumference of the magnetic ring 8.
• the sensor 17 thus lies axially at the level of the magnetic ring 8 in the housing 2.
• the sensor 17 is designed as a TMR sensor with a plurality of measuring elements, which are arranged side by side on a measuring plate 18 and an electrical
• the measuring plate 18 is aligned at an angle deviating from 90 ° to the axis of rotation of the magnetic ring 8, so that the main measuring direction or detection direction of the sensor 17 is aligned obliquely to the axis of rotation of the magnetic ring 8.
• FIG. 2 shows in a perspective detail view the shaft 3 with the magnetic ring carrier 9 arranged thereon.
• the cup shape of the magnetic ring carrier 9 can be seen well.
• the shaft 3 more of the grooves 12, which extend over a wide axial region of the shaft 3, so that the magnetic ring carrier 9 freely on many different axial positions on the shaft 3 can be arranged.
• the magnetic ring carrier 9 can be arranged between the rotor 5 and a further roller bearing or on the side of the rolling element bearing facing away from the rotor 5.
• FIG. 3 shows, in a further perspective partial view, the shaft 3 with the magnetic ring carrier 9 of FIG. 2 arranged thereon, the magnetic ring 8 now being inserted in the magnetic ring carrier 9.
• FIG. 3 shows, in a further perspective partial view, the shaft 3 with the magnetic ring carrier 9 of FIG. 2 arranged thereon, the magnetic ring 8 now being inserted in the magnetic ring carrier 9.
• the magnetic ring 8 can be designed in different number of poles.
• magnetic material all magnetic materials can be used, such as rare earth magnets, in particular sintered or plastic bonded, hard ferrites or the like.
• the sensor 17 detects the strength of the magnetic field generated by the magnetic ring 8 and a computing unit coupled to the sensor 17
• the coil of the stator 6 is then energized and in particular electrically commutated.

Landscapes

• Engineering & Computer Science (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Brushless Motors (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60569888

Family Applications (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (19)

• 2016
  • 2016-12-29 DE DE102016226293.9A patent/DE102016226293A1/de active Pending
• 2017
  • 2017-11-16 EP EP17808372.1A patent/EP3563472A1/de not_active Withdrawn
  • 2017-11-16 JP JP2019535955A patent/JP2020515214A/ja active Pending
  • 2017-11-16 CN CN201780080838.8A patent/CN110140283A/zh active Pending
  • 2017-11-16 US US16/473,766 patent/US20210135546A1/en not_active Abandoned
  • 2017-11-16 WO PCT/EP2017/079390 patent/WO2018121912A1/de unknown

Also Published As

Similar Documents

Legal Events