EP3794719A1 - Schutzschaltung zum schutz eines elektromotors - Google Patents
Schutzschaltung zum schutz eines elektromotorsInfo
- Publication number
- EP3794719A1 EP3794719A1 EP19765714.1A EP19765714A EP3794719A1 EP 3794719 A1 EP3794719 A1 EP 3794719A1 EP 19765714 A EP19765714 A EP 19765714A EP 3794719 A1 EP3794719 A1 EP 3794719A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- motor
- tooth
- protection circuit
- monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- H02K11/25—Devices for sensing temperature, or actuated thereby
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
Definitions
- the invention relates to a protective circuit for protecting a device, in particular an electric motor, against thermal overload.
- B. thermistor protection circuits can be used to detect and evaluate the temperature of a motor winding.
- To record the temperature of the engine Wind come different temperature detector elements or sensors, such as. B. temperature sensors, in particular PTC thermistors (PTC: positive temperature coefficient), PTIOO sensors and KTY sensors (with PTC characteristics), whose electrical resistance changes depending on the detected temperature for use.
- PTC positive temperature coefficient
- PTIOO sensors PTIOO sensors
- KTY sensors with PTC characteristics
- the resistance of such a temperature detector element lies in a first resistance range, as long as the motor winding is in a temperature range that is not problematic.
- the second resistance range the resistance values of which are, for example, greater than that of the first resistance range, then corresponds to a temperature above a system-specific threshold value.
- thermo-click element in its usual field of application separates the circuit through a motor winding when the temperature threshold is reached.
- Temperature sensors are evaluated by means of a protective circuit which essentially determines the electrical resistance of the temperature detector elements concerned and outputs a message signal to a switch, to an evaluation circuit or the like.
- a shutdown of the device is triggered or another predetermined function is started if a thermal overload is detected depending on the measured temperature.
- the sensor element or the temperature monitor does not directly switch the winding current, but acts on the power supply or the control of the power output stage.
- Stator windings of the motor for the purpose of generating a magnetic rotating field for a rotor is controlled depending on the rotor rotational position.
- Such EC motors must be protected against overheating in the event of abnormal operating situations in accordance with the applicable national and international standards.
- the present invention is therefore based on the object to provide a temperature monitoring and protection circuit of the type described, generic type that ensures increased operational safety to avoid engine overheating and reliably detects a temperature rise especially above an allowable limit temperature.
- a basic idea of the invention is that the effect is used for temperature monitoring that certain metals and their alloys each have a different property with regard to the loss of their magnetic properties. When the so-called Curie temperature is reached, which is different for each substance, such substances lose their magnetic properties almost completely to completely.
- Another basic idea of the invention is to use a very specific combination of substances in a tooth of an engine, the Curie temperature of which deviates from one another and to assemble that material or an alloy material in its alloy such that its Curie temperature is significantly below that Curie temperature of the material of the tooth lies.
- a temperature monitoring and protection circuit for monitoring a defined motor limit temperature T G formed from at least one tooth, in particular a tooth of a laminated core of a motor, comprising a detection device for detecting a magnetic flux in the tooth, the tooth has at least one cavity (or a plurality of cavities) in which a ferromagnetic material is introduced, the Curie Temperature Tc is below or close to the engine limit temperature.
- the ferromagnetic material is a specifically composed alloy material, in which the alloy elements in their mass% proportion are selected in such a way that the following condition for the Curie temperature of the alloy results:
- the Curie temperature is between 0.95 and 0.96 of the temperature to be monitored. This has the advantage that a significant change in the magnetic flux is detected in good time before, but not too soon, as soon as the temperature of the motor approaches the temperature to be monitored or the limit temperature.
- the engine can be up to a relatively high temperature range near z.
- B. a limit temperature can be used, which is not the case due to the inertia of classic temperature sensors.
- a component of the alloy of the ferromagnetic material is one or more metals which belong to the group of rare earths, preferably the lanthanoids.
- a likewise advantageous embodiment provides that one component of the alloy of the ferromagnetic material is one or more metals which belong to the group of rare earths.
- the detection device is part of the commutation electronics for an EC motor.
- the motor elec- electronics can be used to detect the magnetic flux and asymmetries due to the influence of the magnetic flux in the tooth.
- the detection device is further preferably designed such that it can increasingly detect a change in the magnetic flux when the temperature of the motor increases, so that continuous temperature monitoring can also take place.
- Flierzu could e.g. Reference values for each temperature can be stored in a data memory, so that data can be evaluated by comparing the measured actual values of the magnetic flux and the reference values.
- a measurement curve for a specific engine type can be recorded beforehand, in which the relationship between the temperature increase and the change was recorded on the basis of the alloy material introduced into the cavity or cavities of this engine. This curve can e.g. B. can be used as a reference curve when using the motor in the field.
- the detection device is designed to detect a phase transition into the non-ferromagnetic state when the Curie temperature is reached. It can further be provided that a switch-off device is also provided which interrupts the energization of the motor coils or the motor when a specific change in the measured magnetic flux through the tooth is reached.
- a material should be selected which either has no or only a slight change in the magnetic flux in the area of the motor temperature to be monitored.
- a material with a comparatively much higher Curie temperature can be provided. It is therefore impossible for the effects to partially overlap or the influence on the change in the magnetic flux cannot be clearly assigned.
- Another aspect of the present invention relates to a method for monitoring the motor temperature of a motor, in particular an EC motor, wherein at least one cavity is provided in at least one tooth of a tooth coil of the motor, in which a ferromagnetic material is introduced, the Curie temperature of which T c is below the motor limit temperature or a motor temperature to be monitored, the change in the magnetic flux due to the change in the properties of the ferromagnetic material being detected by means of a detection device and a temperature determination of the motor being carried out from this by means of an evaluation device.
- 1 is a schematic view of components of a temperature monitoring and protection circuit according to an exemplary embodiment of the invention. 1 shows a temperature monitoring and protection circuit 1 for monitoring a defined engine limit temperature T G or an engine temperature to be monitored, merely by way of example.
- the device according to the invention has at least one tooth 2, as is shown schematically.
- the tooth 2 has a cavity 3 in which a ferromagnetic material 4 is introduced, the Curie temperature Tc of which is below or close to the engine limit temperature or a motor temperature to be monitored. Also shown is a detection device 5 for detecting a magnetic flux in the tooth, the change in the current due to the change in the magnetic flux being detected for this purpose.
- the detection device 5 is part of the commutation electronics for an EC motor.
- An asymmetry in the current can also be detected here by measuring the change in flow by means of a current measurement in the winding.
- the ferromagnetic material 4 is an alloy material in which the alloying elements are selected in their percentage by mass in such a way that a low Curie temperature results. So you can z. B. use a neodymium-iron-boron alloy, the Curie temperature of which is between 120 ° C and 150 ° C depending on the alloy components. Anisotropically sintered neodymium-iron-boron alloys such as Nd2Fe14B are less suitable because their Curie temperature is comparatively high. In order to implement the invention, the person skilled in the art must therefore put together a suitable alloy that is specifically designed for the engine type. In general, homogeneous mixed alloys as well as heterogeneous alloys of several metals are suitable, in which one or more of the metals come from the group of rare earths, preferably the lanthanoids.
- a switch-off device 6 which can interrupt the energization of the motor coils when a specific change in the measured magnetic flux is reached.
- conventional power interruption devices which are well known in the prior art can be used, which consequently are not described in detail and, for. B. Hall sensors.
- the material of the tooth 2 should consist of a material which has either no or only a slight change in the magnetic flux in the region of the motor temperature to be monitored or has a significantly and significantly higher Curie temperature, such as, for. B.> 300 ° C.
- the embodiment of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the solution shown, even in the case of fundamentally different types.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018126711.8A DE102018126711A1 (de) | 2018-10-25 | 2018-10-25 | Schutzschaltung zum Schutz eines Elektromotors |
PCT/EP2019/073869 WO2020083553A1 (de) | 2018-10-25 | 2019-09-06 | Schutzschaltung zum schutz eines elektromotors |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3794719A1 true EP3794719A1 (de) | 2021-03-24 |
Family
ID=67902532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19765714.1A Pending EP3794719A1 (de) | 2018-10-25 | 2019-09-06 | Schutzschaltung zum schutz eines elektromotors |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3794719A1 (de) |
CN (1) | CN209860747U (de) |
DE (1) | DE102018126711A1 (de) |
WO (1) | WO2020083553A1 (de) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2535993B1 (de) | 2011-06-16 | 2016-03-30 | ebm-papst Mulfingen GmbH & Co. KG | Schneller und redundanter Übertemperaturschutz mit sicherem Halt für einen EC-Motor |
US20170082503A1 (en) * | 2015-09-22 | 2017-03-23 | Empire Technology Development Llc | Temperature tags and methods of making and using the same |
DE102017100881A1 (de) * | 2017-01-18 | 2018-07-19 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Wicklungstemperaturüberwachung |
-
2018
- 2018-10-25 DE DE102018126711.8A patent/DE102018126711A1/de active Pending
-
2019
- 2019-04-22 CN CN201920555435.0U patent/CN209860747U/zh active Active
- 2019-09-06 EP EP19765714.1A patent/EP3794719A1/de active Pending
- 2019-09-06 WO PCT/EP2019/073869 patent/WO2020083553A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
CN209860747U (zh) | 2019-12-27 |
WO2020083553A1 (de) | 2020-04-30 |
DE102018126711A1 (de) | 2020-04-30 |
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