GB2382227A - Proportional solenoid actuator - Google Patents
Proportional solenoid actuator Download PDFInfo
- Publication number
- GB2382227A GB2382227A GB0201235A GB0201235A GB2382227A GB 2382227 A GB2382227 A GB 2382227A GB 0201235 A GB0201235 A GB 0201235A GB 0201235 A GB0201235 A GB 0201235A GB 2382227 A GB2382227 A GB 2382227A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- actuator device
- proportional solenoid
- solenoid actuator
- sensor coil
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- G01D5/20—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 by varying inductance, e.g. by a movable armature
- G01D5/2006—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 by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2013—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 by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1844—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F2007/1684—Armature position measurement using coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
- H01F7/123—Guiding or setting position of armatures, e.g. retaining armatures in their end position by ancillary coil
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnets (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A proportional solenoid actuator 10 comprises an armature 14 arranged with reciprocating movement within an armature drive coil 12 and a sensing coil 32. The sensing coil 32 senses the position of the armature 14 relative to the drive coil 12. An exciting coil 34 may be formed coaxially with the other said coils 12, 32. The exciting coil 34 may be energised by a secondary electrical supply with a frequency between 30 Hz and 3 kHz whilst the primary supply to the drive coil 12 may be a pulse width modulated (PWM) signal with a frequency between 30Hz and 300Hz. The exciting coil 34 is used in conjunction with the position sensing coil 32 to detect the armature position to provide a feedback signal which may be compared with a reference value and used to control the current applied to the drive coil 12 and thereby control the armature position. The coils 12, 32, 34 may be superposed on the same bobbin or the sensing and exciting coils 32, 34 on one bobbin and the drive coil 12 on a separate bobbin. The solenoid may be used in a gas control system of a boiler.
Description
<Desc/Clms Page number 1>
PROPORTIONAL SOLENOID ACTUATOR DEVICE
This invention relates to a proportional solenoid actuator device.
A conventional solenoid actuator comprises an energisable solenoid and armature arrangement which, via displacement of the armature, is designed to operate a peripheral device. However, these devices exhibit increasing force/displacement characteristics and as such require an opposing load, such as spring biasing, to provide operational stability and a means by which the displacement of the peripheral device becomes proportional to the energisation of the solenoid.
To further improve the proportionality between the applied solenoid energisation and the armature displacement, it is known to alter the internal geometry of the magnetic circuit to divert the gap flux radially and thus reduce the required force. This results in the flattening out of the operating characteristic.
These modifications are suitable for passive or non-fluctuating external loads or sources but, when dealing with dynamic or fluctuating external loads or sources, feedback control is required. In this case, it is necessary to be able to accurately monitor the position of the armature and adjust the solenoid current accordingly.
Position sensing devices which allow feedback control are known. However, when using a position sensing device to form a proportional feedback control system, it is preferable to be able to maintain the reliability of the basic device while not
<Desc/Clms Page number 2>
significantly increasing its overall size.
The present invention seeks to provide a solution to this problem.
According to the present invention, there is provided a proportional solenoid actuator device comprising an energisable solenoid coil, a sensor coil, and an armature which is mounted for reciprocal movement in both the solenoid coil and the sensor coil, the sensor coil generating an output which corresponds to the position of the armature relative to the solenoid coil.
Preferable and/or optional features of the first aspect of the present invention are set forth in claims 2 to 16, inclusive.
The present invention will now be described, by way of example only, with reference to the accompanying drawings, wherein:
Figure 1 is a diagrammatic partially sectioned view of a first embodiment of a proportional solenoid actuator device in accordance with the present invention,
Figure 2 is a circuit diagram of the device,
Figure 3 is a schematic view of the proportional solenoid actuator device incorporated in a gas flow control system, and
<Desc/Clms Page number 3>
Figure 4 is a diagrammatic partially sectioned view of a second embodiment of the proportional solenoid actuator device in accordance with the present invention.
Referring now to Figures 1 and 2, a proportional solenoid actuator device 10 comprises a solenoid coil 12 and an armature 14. The solenoid coil 12 is mounted on a former 16 which has a bore 18 and which is held in a housing 20. The housing 20 also has a stepped through bore 22 which is coaxial with the bore 18 of the former 16. The armature 14 is mounted for reciprocal and slidable movement in the bores 18 and 22 by energisation of the solenoid coil 12, and this arrangement, in use, acts to form a variable reluctance magnetic circuit. The internal geometry of the housing 20 is of known configuration, which provides a stop 24 for the armature 14 at one end thereof. The former 16 and housing 20 have the same or substantially same dimensions as an equivalent conventional solenoid actuator described above.
The armature 14, in any suitable known manner, is biased in a direction projecting from the former 16/housing 20 by urging means, conceptually shown as a tension spring 26 mounted on a surface 28 fixed relative to the housing 20.
The solenoid coil 12 is energisable by a main electrical supply 30 which produces a drive current wave form in the form of a pulse width modulated signal. The drive current wave form has a typical frequency of 30 Hz to 300 Hz, and the pulse width modulation enables the hysteresis effect experienced by the armature 14, due to inherent magnetic static friction caused by the increasing and decreasing drive current, to be
<Desc/Clms Page number 4>
eliminated or substantially eliminated.
The proportional solenoid actuator device 10 also comprises a sensor element and excitation means. The sensor element is in the form of a sensor coil 32 and the excitation means is in the form of an excitation coil 34.
The sensor coil 32 and the excitation coil 34 are both formed coaxially with the solenoid coil 12 on the former 16. Although the sensor coil 32 is superposed on the excitation coil 34, and the solenoid coil 12 is superposed on the sensor coil 32, other configurations are possible. The solenoid coil 12, sensor coil 32 and excitation coil 34 can be formed integrally with each other or separately on the same former 16.
The excitation coil 34 is energisable by a secondary electrical supply 36 which is independent of the main electrical supply 30. Preferably, the secondary electrical supply 36 has a sinusoidal wave form and has a typical frequency of 30 Hz to 3 kHz.
However, the secondary electrical supply 36 may have another kind of wave form shape, such as a trapezoidal or square wave form, but this may result in transient spikes which are known to interfere with the signals of other electronic devices and elements.
Referring to Figure 3, to enable feedback control, the proportional solenoid actuator device 10 preferably includes comparator means for comparing the output of the sensor coil 32 with a reference value Rref and for varying the current applied to the solenoid coil 12 based on the difference between the output of the sensor coil 32 and the
<Desc/Clms Page number 5>
reference value Rref.
The reference value Rref is a value corresponding typically to an optimum or desirable state for a device operated or influenced by the armature 14 of the proportional solenoid actuator device 10.
The comparator means comprises a conditioning circuit 38, a comparator 40 and a solenoid drive circuit 42 which are interconnected so that the proportional solenoid actuator device 10 forms a closed loop system.
The proportional solenoid actuator device 10 is shown incorporated as part of a gas flow control system 44 which can be used to control a domestic and/or industrial gas boiler (not shown). The gas flow control system 44 has a valve 46 which has an inlet A and an outlet B and which, depending on the state or position of its valve stem 48, controls the rate of flow of gas to the boiler. In this case, the armature 14 of the proportional solenoid actuator device 10 directly adjusts the valve stem 48.
The concept of feedback control is well-known. When the excitation coil 34 is energised by the secondary electrical supply 36, a flux is induced in the sensor coil 32.
The magnitude of the induced flux corresponds directly to the position of the armature 14 and thus also to the size of gap X (shown in figure 1) between the end of the armature 14 received in the housing 20 and the stop 24. As the energisation of the solenoid coil 12 increases or decreases, the position of the armature 14 relative to the solenoid coil 12 changes. The amplitude of the voltage induced in the sensor coil 32 corresponds directly
<Desc/Clms Page number 6>
to the size or magnitude of the gap X, and a sensor signal, being the current induced in the sensor coil 32, is output from the sensor coil 32 to the conditioning circuit 38.
The conditioning circuit 38 samples the sensor signal during the OFF period of the pulse width modulated signal of the solenoid coil 12, so that the signal detected by the conditioning circuit 38 is not corrupted by the energisation of the solenoid coil 12.
The conditioning circuit 38 outputs a conditioned signal, which corresponds to the sensor signal output from the sensor coil 32, to the comparator 40 which compares the conditioned signal with the aforementioned reference value Rref.
As a result of the difference between the conditioned signal and the reference value Rref, a comparator signal is output from the comparator 40 to the solenoid drive circuit 42. If the difference is other than zero, the current to the solenoid coil 12 is increased or decreased, by the solenoid drive circuit 42, depending on the difference.
This results in the position of the armature 14 relative to the solenoid 12 being changed. On the other hand, if the difference between the conditioned signal and reference value Reef is zero, the optimum or desired rate of flow of gas has been reached or substantially reached and a comparator signal is supplied to the solenoid drive circuit 42 so that the energisation of the solenoid coil 12 maintains the armature 14 at that required position. This arrangement of closed loop proportional feedback control allows for dynamic adjustment of the gas flow control valve when, for example, a fluctuation in the pressure of the gas supply occurs. During a fluctuation, the rate of flow of gas changes due to the
<Desc/Clms Page number 7>
change in pressure. This is detectable by a suitable peripheral detection device (not shown). The reference value Rref is adjusted accordingly. Since the conditioning signal then no longer matches the reference value Rref, the energisation of the solenoid coil 12 by the solenoid drive circuit 42 is adjusted until the conditioning signal output from the conditioning circuit 38 matches the adjusted reference value Rref.
The reference value Rf is thus, preferably, a dynamic value. The reference value Reef may be obtained from a second closed loop system (not shown) in which the temperature of the gas boiler is monitored and compared to a further reference value which is independently set.
It will be realised that, although the proportional solenoid actuator device 10 has been described as being incorporated as part of a gas flow control system, which in effect dispenses with the need for a traditional on-off thermostat, the device 10 can be utilised in any other suitable application, such as the control of recirculating exhaust gas in the automotive industry.
In the two following embodiments, like references refer to like parts.
Referring to Figure 4, a second embodiment of the proportional solenoid actuator device 10 is shown in which the sensor coil 32 and the excitation coil 34 are disposed outside the magnetic circuit of which the solenoid coil 12 forms a part. This results in the sensor coil 32 and the excitation coil 34 being at a position which is spaced from the solenoid coil 12.
<Desc/Clms Page number 8>
The armature 14 is common to all three coils, namely the sensor coil 32, excitation coil 34 and the solenoid coil 12, and is mounted for reciprocal movement in the coils. The solenoid coil 12 and the sensor coil 32 are typically coaxially aligned which simplifies the manufacture and mounting of the armature 14.
By spacing the sensor coil 32 from the magnetic circuit of the solenoid coil 12, magnetic interference can be avoided or substantially avoided. Consequently, the output of the sensor coil 32 can be sampled continuously or at any suitable interval, which includes the ON period of the pulse width modulated signal of the solenoid coil 12, by the conditioning circuit 38. Furthermore, the material of the housing 12 adjacent to the sensor coil 32 and the excitation coil 34 can be magnetically low loss, compared to the material of the housing 12 which surrounds the solenoid coil 12, which enables the excitation coil 34 to be energised at a higher frequency than the solenoid coil 12.
In an unillustrated third embodiment of the present invention, the excitation coil 34 is omitted and the independent power supply 36 directly energises the sensor coil 32.
It should be noted that the sensor coil 32 and the solenoid coil 12 may be arranged relative to each other in accordance with either the first or second embodiments.
In this case, the inductance of the sensor coil 32, which fluctuates depending on
<Desc/Clms Page number 9>
the position of the armature 14, is monitored. To this end, the proportional actuator device 10 includes inductance monitoring means, typically in the form of an external measurement circuit, which monitors the change in the inductance of the sensor coil 32.
The conditioning circuit 38 samples the signals generated by the inductance monitoring means. The output of the sensor coil 32 is thus the change in its inductance, which relates to the position of the armature 14 relative to the solenoid coil 12.
If the sensor coil 32 is positioned within the magnetic circuit of the solenoid coil 12, as in the first embodiment, the conditioning circuit 38 will sample the sensor coil inductance during the OFF-period of the solenoid coil energisation. However, if the sensor coil 32 is not or substantially not subject to influence by the magnetic circuit of the solenoid coil 12, as in the second embodiment, then inductance measurement readings can be taken continuously or at any suitable interval, which includes the ON period of the pulse width modulated signal of the solenoid coil 12.
It should be understood that, although the embodiments have been described as using independent electrical supply 36, they are not limited by this and any suitable means of energisation may be utilised in place of independent electrical supply 36.
Furthermore, the proportional solenoid actuator device is not limited by use of excitation means and any output of the sensor coil 32 which corresponds to the position of the armature 14 relative to the solenoid coil 12, no matter how the output is generated, may be used.
<Desc/Clms Page number 10>
It is thus possible to provide a proportional solenoid actuator device which has a position sensing arrangement and an armature which is common to both the position sensing arrangement and solenoid coil of the actuator device. Furthermore, the position sensing arrangement is integrated within the housing of the solenoid coil, the actuator device has no additional moving parts over a conventional proportional solenoid actuator, and the dimensions of the housing and former are the same or substantially the same as those of the conventional actuator.
The embodiments described above are given by way of example only and various modifications will be apparent to persons skilled in the art without departing from the scope of the invention. For example, the solenoid coil 12 could be configured to move reciprocally while the armature 14 remains stationary.
Claims (17)
1. A proportional solenoid actuator device comprising an energisable solenoid coil, a sensor coil, and an armature which is mounted for reciprocal movement in both the solenoid coil and the sensor coil, the sensor coil generating an output which corresponds to the position of the armature relative to the solenoid coil.
2. A proportional solenoid actuator device as claimed in claim 1, wherein the solenoid coil and the sensor coil form part of the same magnetic circuit.
3. A proportional solenoid actuator device as claimed in claim 2, wherein the solenoid coil and the sensor coil are coaxial and superposed.
4. A proportional solenoid actuator device as claimed in claim 1, wherein the sensor coil is spaced from the magnetic circuit of which the solenoid coil forms a part.
5. A proportional solenoid actuator device as claimed in claim 4, wherein the solenoid coil and the sensor coil are coaxially aligned with each other.
6. A proportional solenoid actuator device as claimed in any one of the preceding claims, further comprising excitation means by which the sensor coil output is generated.
7. A proportional solenoid actuator device as claimed in claim 6, wherein the
<Desc/Clms Page number 12>
excitation means includes an excitation coil and means for energising the excitation coil, the sensor coil and the excitation coil being coaxial and superposed, and the output of the sensor coil being the induced current when the excitation coil is energised.
8. A proportional solenoid actuator device as claimed in claim 7, wherein the solenoid coil is energised at a frequency of between 30 Hz and 300 Hz, and the excitation coil is energised at a frequency between 30 Hz and 3 kHz.
9. A proportional solenoid actuator device as claimed in claim 6, wherein the excitation means is in the form of means for energising the sensor coil, and the actuator device includes inductance monitoring means, the output of the energised sensor coil being the change in magnetic inductance of the sensor coil due to relative movement of the armature, and the inductance monitoring means monitoring the said change and outputting a signal based on the change.
10. A proportional solenoid actuator device as claimed in any one of claims 7 to 9, wherein the energisation means is in the form of an independent electrical supply.
11. A proportional solenoid actuator device as claimed in claim 7 or claim 10, wherein the energisation means supplies a current having a sinusoidal waveform.
12. A proportional solenoid actuator device as claimed in any one of the preceding claims, further comprising comparator means for comparing the output derived from the
<Desc/Clms Page number 13>
sensor coil with a reference value and for varying the current applied to the solenoid coil in response to a difference between the output of the sensor coil and the reference value to maintain the armature at a required position.
13. A proportional solenoid actuator device as claimed in claim 12, wherein the solenoid coil is energised by a pulse-width modulated signal.
14. A proportional solenoid actuator device as claimed in claim 13, wherein the comparator means samples the output of the sensor coil during the OFF period of the signal.
15. A proportional solenoid actuator device as claimed in claim 13 when claim 12 is dependent on claim 4 or claim 5, wherein the comparator means samples the output of the sensor coil continuously or at any suitable interval which includes the ON period of the signal.
16. A proportional solenoid actuator device as claimed in any one of claims 12 to 15 in combination with a gas flow control system of a gas boiler.
17. A proportional solenoid actuator device substantially as hereinbefore described with reference to Figures 1 to 3 or Figure 4 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0127477A GB0127477D0 (en) | 2001-11-16 | 2001-11-16 | Improvements in or relating to a proportional solenoid actuator device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0201235D0 GB0201235D0 (en) | 2002-03-06 |
| GB2382227A true GB2382227A (en) | 2003-05-21 |
Family
ID=9925863
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0127477A Ceased GB0127477D0 (en) | 2001-11-16 | 2001-11-16 | Improvements in or relating to a proportional solenoid actuator device |
| GB0201235A Withdrawn GB2382227A (en) | 2001-11-16 | 2002-01-21 | Proportional solenoid actuator |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0127477A Ceased GB0127477D0 (en) | 2001-11-16 | 2001-11-16 | Improvements in or relating to a proportional solenoid actuator device |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB0127477D0 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009731A1 (en) * | 2006-07-18 | 2008-01-24 | Robert Bosch Gmbh | Coil arrangement having a coil support of an electromagnetic drive |
| CN102915822A (en) * | 2011-08-05 | 2013-02-06 | 罗伯特·博世有限公司 | Electrical magnetic coil, starting device and method for manufacturing a magnetic coil |
| US8405403B2 (en) | 2009-02-09 | 2013-03-26 | Rolls-Royce Plc | Determining solenoid health |
| DE102014224581A1 (en) * | 2014-12-02 | 2016-06-02 | Robert Bosch Gmbh | Electromagnetic relay, in particular starter relay for a starting device |
| WO2019238272A1 (en) * | 2018-06-14 | 2019-12-19 | Eaton Intelligent Power Limited | Differential having armature position detection |
| US11396935B2 (en) | 2017-06-16 | 2022-07-26 | Eaton Intelligent Power Limited | Differential having armature position detection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2445005A1 (en) * | 1978-12-20 | 1980-07-18 | Binder Magnete | Solenoid for operating valve hydraulic system - has position-detecting device not increasing axial length of solenoid |
| EP0067298A1 (en) * | 1981-06-13 | 1982-12-22 | Binder Magnete GmbH | Electromagnetic actuator with position detection |
| DE3150814A1 (en) * | 1981-12-22 | 1983-06-30 | Herion-Werke Kg, 7012 Fellbach | Device for the contact-free determination of the switching position of the armature of an electromagnet |
| US5172298A (en) * | 1990-01-09 | 1992-12-15 | Honda Giken Kogyo Kabushiki Kaisha | Electromagnetic actuator |
| EP0908904A2 (en) * | 1997-10-06 | 1999-04-14 | Husco International, Inc. | Method and apparatus for sensing armature position in reluctance electromagnetic actuators |
-
2001
- 2001-11-16 GB GB0127477A patent/GB0127477D0/en not_active Ceased
-
2002
- 2002-01-21 GB GB0201235A patent/GB2382227A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2445005A1 (en) * | 1978-12-20 | 1980-07-18 | Binder Magnete | Solenoid for operating valve hydraulic system - has position-detecting device not increasing axial length of solenoid |
| EP0067298A1 (en) * | 1981-06-13 | 1982-12-22 | Binder Magnete GmbH | Electromagnetic actuator with position detection |
| DE3150814A1 (en) * | 1981-12-22 | 1983-06-30 | Herion-Werke Kg, 7012 Fellbach | Device for the contact-free determination of the switching position of the armature of an electromagnet |
| US5172298A (en) * | 1990-01-09 | 1992-12-15 | Honda Giken Kogyo Kabushiki Kaisha | Electromagnetic actuator |
| EP0908904A2 (en) * | 1997-10-06 | 1999-04-14 | Husco International, Inc. | Method and apparatus for sensing armature position in reluctance electromagnetic actuators |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009731A1 (en) * | 2006-07-18 | 2008-01-24 | Robert Bosch Gmbh | Coil arrangement having a coil support of an electromagnetic drive |
| US8004378B2 (en) | 2006-07-18 | 2011-08-23 | Robert Bosch Gmbh | Coil configuration having a coil brace of an electromagnetic drive |
| US8405403B2 (en) | 2009-02-09 | 2013-03-26 | Rolls-Royce Plc | Determining solenoid health |
| CN102915822A (en) * | 2011-08-05 | 2013-02-06 | 罗伯特·博世有限公司 | Electrical magnetic coil, starting device and method for manufacturing a magnetic coil |
| FR2978863A1 (en) * | 2011-08-05 | 2013-02-08 | Bosch Gmbh Robert | LINEAR ELECTRO-MAGNET AND STARTER EQUIPPED WITH SUCH ELECTRO-MAGNET AND METHOD FOR MANUFACTURING THE SAME |
| CN102915822B (en) * | 2011-08-05 | 2017-09-12 | 罗伯特·博世有限公司 | Magnetic coil, starting device and the method for manufacturing magnetic coil of electricity |
| DE102014224581A1 (en) * | 2014-12-02 | 2016-06-02 | Robert Bosch Gmbh | Electromagnetic relay, in particular starter relay for a starting device |
| US11396935B2 (en) | 2017-06-16 | 2022-07-26 | Eaton Intelligent Power Limited | Differential having armature position detection |
| WO2019238272A1 (en) * | 2018-06-14 | 2019-12-19 | Eaton Intelligent Power Limited | Differential having armature position detection |
| CN112313480A (en) * | 2018-06-14 | 2021-02-02 | 伊顿智能动力有限公司 | Differential with armature position detection |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0201235D0 (en) | 2002-03-06 |
| GB0127477D0 (en) | 2002-01-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| COOA | Change in applicant's name or ownership of the application | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |