JP2005539472A - Electronic control device for motor - Google Patents

Abstract

The present invention relates to an electronic control device for an asymmetric single-phase or three-phase motor, comprising at least one electronic substrate (2) for motor supply control and a relay (3), the electronic substrate (2) comprising: By including at least one microcontroller (7) for analyzing electrical parameters of the distribution network such as frequency and voltage, the parameters are adapted to the proper operation of the motor and relays (3 ), And preferably, the substrate (2) and the relay (3) are accommodated in the case (1). In this device, the relay (3) is a static relay, and the electronic board (2) is further supplied from a motor supply network to reduce the supply voltage of other parts of the device. Comprising an impedance (4) and at least one start and / or stop switching member (5) of the device which can be controlled via the control member (6), the control member itself being preferably controlled by manual movement control means It is controlled. Used to control single-phase or three-phase motors.

Description

  The present invention preferably relates to an electronic control device for an asymmetric single-phase or three-phase motor, and includes at least one electronic board and relay for motor supply control, and preferably the board and the relay are inside a case. Be contained.

  Control devices of the type described above can be adapted to both standard and explosive environments, but in particular, but not limited to LEROY-SOMER, ELNOR or ATAV® type explosion protection. Can be used in all types of explosive atmospheres with gas or dust for type motors. Such electric motors are widely used for stirring control of paints or other substances containing volatile compounds, and one example of the most widely known hazard classification is IIB T4.

  For a long time, these motor control devices have been mainly based on mechanical principles, as described in particular in EP-A 0091360.

  Similarly, US Pat. No. 6,615,792 describes a phase control device for an asymmetric three-phase motor. In this patent, the motor is supplied by using a current whose electric parameters such as frequency and voltage correspond to the proper operation of the motor. The means used to solve these technical problems requires the presence of an electromagnetic relay combined with a power switch, which has the following disadvantages: That is, it is well known that consumption and electric power are large, and a spark is generated at each switching. Therefore, in this phase control, the switch is closed in order to be able to supply a first sensor that detects the voltage and frequency conditions of the current, and if these conditions are preferred, the electromagnetic relay is closed and the power is A second detection system, which controls the supply of the motor by switching the switch and is more sensitive than the first detection system, acts on the first detection system with a delay, the frequency of the supply current and Re-detect the voltage. If the current supply conditions are not favorable, the second system can start opening the relay and opening the power switch. However, the above-mentioned type of electromechanical relay has a number of drawbacks compared to electronic control devices.

  Furthermore, in the current supply device described in the specification of European Patent No. A1079509, three capacitors connected in series form a capacitive impedance supplied from a motor supply network, and this capacitive impedance is It serves to lower the supply voltage of other parts. Such capacitive impedance provides the LED. Further, the photodetector sends a light-on signal or a light-off signal according to the state of the LED to the microprocessor. When the LED is lit, the microprocessor notified by the photodetector polarizes the transistor, which then becomes a conductor and supplies an electromagnetic relay, thereby enabling the motor to be supplied. When a failure occurs in the input current, the LED is turned off and the photodetector informs the microprocessor that the LED is turned off, and the microprocessor opens the electromagnetic relay and shuts off any supply of the motor. The main drawback of such a device is again here related to the presence of electromagnetic relays that inevitably require damaged mechanical contacts in environmental installations with a high risk of explosion. The presence of at least three capacitors indicates that the strength required for control is large depending on the type of control element.

  Later, electronic control gradually appeared in the market to respond to the technical development of products. As a result, multiple electronic control technologies compete for standard or explosion-proof motor control applications, and in such situations, depending on whether the type of electronic control is by wired logic or by program logic, an electrical machine with dry contacts A distinction is made between relay-type or thyristor-contact static-relay-type power switch means, start and stop control elements, and no electrical hazards in all situations, especially according to European guidelines and current uniform standards A distinction is made between the safety protection modes necessary to ensure that there is no risk of explosion in an explosive environment.

  The following examples illustrate various embodiments according to the above criteria.

  Several motor control means have been proposed directly by motor manufacturers in particular, such as FRANKLIN or RELIANCE. Electronic control by program logic is relayed to a lightweight and compact plastic case via an electrical connection cable. The other end of the connection cable is connected to a terminal case of the motor, and a power switch is necessarily accommodated in the case. This switch is mainly composed of a relay which may be of electromechanical type or of static type. The starting and stopping of the motor is controlled by a keyboard consisting of a flexible diaphragm for touch buttons. The electrical safety element in the explosive atmosphere is configured by a combination of an explosion-proof exterior mode “d” for a motor and a mutual safety mode “i” for an electronic board and a relayed control element.

  This control device has the disadvantage that it is inseparably coupled to a certain type of motor with only suitable connection means. These “motor and electronic control” host assemblies are not universal and should be used for these other motors if no other motors on the market are configured for this purpose. I can't.

  Several other motor control means have been proposed by electrical component manufacturers such as LEGRAND ATX, TECHNOR or BARTEC. These motor control means are not provided with electronic control means, and are simply composed of standard electrical components such as a power switch and a relay switch that protect the motor, and are collected in an explosion-proof outer casing “d”. Can receive very strong current of electrical component type. This sheath is combined with an electrical contact pushbutton for start / stop control in a similar protection mode or mode “e” with enhanced safety as described in standard EN50019. In that case, the case is connected to the motor by a suitable electrical cable.

  These electrical control devices, which are listed in the catalogs of a number of electrical equipment manufacturers for motors in explosive atmospheres, are remarkably high in price and meet safety requirements with only their basic operating functions. Therefore, since the aluminum case or plastic case of the exterior “d” type is extremely thick, there is a disadvantage that it is large and very heavy. As a result, these solutions are not economically satisfactory. This is because the basic model includes ancillary characteristics that make it possible to avoid investing a large amount of tools in case manufacture, and cannot be optimized. Moreover, all authorizations are dedicated to one specific technical application and cannot be generalized to another application. This type of equipment, assembled as needed in the distributor's catalog, can be purchased immediately, but the use of such equipment can be fatal for paint agitators that must always keep the overall cost low. I understand.

  Therefore, recently, in the special field of paint stirrers, FAS and FILLON-PICHON have developed a unique solution that is much more economical and can be applied to both explosion-proof motors and standard motors. developed. Thus, these two innovative and original high performance electronic controllers have appeared in the global market for paint agitators for automotive body repair since 1995.

  The electronic control unit of FAS includes an ultra-small wired logic electronic board on which an assembly of electromechanical relay type control components and power switching components is set. This device can be housed in a standard case made of plastic or in a special explosion-proof aluminum sheath “d” for use in an explosive atmosphere according to standard EN50018. The motor is started and stopped by a touch button on a diaphragm type soft keyboard. The safety of the motor is secured by an ammeter-type protective element. An alternative solution consists of housing the assembly of electronic means in the motor terminal case and relaying only a switch, such as an electrical contact pushbutton, in a protective mode “d” for potentially explosive atmospheres. . On the other hand, the electronic control unit of FILLOM-PICHON includes at least one program logic electronic board housed in a case, and a static relay type power switching component CELDUC for motor supply control. The motor is started and stopped by a touch button on a diaphragm type soft keyboard. For the protection in explosive environments, the general rules specified in European standard EN50014 apply, in particular the encapsulation protection “m” (standard EN50028) with polyurethane or epoxy resin and the intrinsic safety protection “i”. ”(Standard EN50020).

  The electronic board uses in these two devices is the technology of at least one transformer welded to the electronic circuit connected to the distribution network by the phase line of the motor AC supply network. This transformer serves to lower the local voltage and extract the energy needed to supply the regulator, which releases this energy as a DC voltage of a few volts, which is used exclusively for control logic. The transformer is protected in the previous stage by a fuse-type component for overcurrent or a varistor-type component for overvoltage.

  The various customized control devices described above have various drawbacks.

  In fact, it is impossible to achieve a miniature transformer that can withstand the highest input voltage without risk of overheating, while at the same time keeping the voltage range of the network very wide.

  First, the transformer consumes energy and overheats even when no voltage is applied. A voltage that is too high, about 250 volts or much more, accelerates the heating action and critically damages the part.

Second, the transformer manufacturing technology itself is a proven constant transformation ratio “r” corresponding to the relationship between the number of turns of the primary coil of the transformer n ₁ and the number of turns of the secondary coil n _2. accompanied by a dependency on " _t ".

here,
U ₁ and I ₁ are the primary coil voltage and current intensity, respectively.
U ₂ and I ₂ are the voltage and current intensity of the secondary coil, respectively.

  In this situation, in order to find an acceptable compromise, the transformer must be larger than necessary to meet the requirements of the standard EN50028 for the encapsulation protection mode “m” and a thermal fuse must be added for temperature control. I must. In either case, special manufacturing costs a great deal.

  In addition, the operating range of existing transformers corresponding to the maximum performance reached is still too narrow to meet the demands of network assembly around the world even with wide tolerances. As a result, it is necessary to construct at least two types of transformers and to adapt the control device to the national network where such control devices are to be installed each time. In addition, the voltage must be reduced to a value that can be always used by the adjustment component that serves to supply a DC voltage to the control component of the electronic circuit in accordance with the size of the voltage range.

  In addition, a large transformer is placed on an electronic board that is itself locked at a certain height of the aluminum plate, while being placed on this same aluminum plate inside the case for heat dissipation. Placing the assembly independently of the standard static relay components makes the assembly very wide and relatively space consuming. In parallel, this assembly must be embedded inside a protective material such as resin and all electrical parts must be insulated from the explosive atmosphere area according to the structural requirements of the "m" mode by encapsulation. In that case, a coating with a height of 3 mm is required not only on the top part but also around the electrical part. If the outer dimensions are large, the consumption of the resin inevitably increases and the price of the control device increases.

  In addition, when assembling multiple separate electrical assemblies through connection terminals, metal rings to be welded or clamped, or by the addition of welded connections or shunts, the preparation time is long and the manufacturing process is complicated. , Hard to control. In that case, the guarantee that the product will last over time is no longer absolute, despite all the attention paid to the many quality controls at every stage of industrial manufacture. In fact, the risk of failure can occur after the transportation period or after unusual use of the product in extreme environments.

  In addition, when using a control member of a diaphragm type keyboard, over time, some failures such as damage to the electrical connection layer when the resin expands excessively, or blocking of the touch buttons due to high room temperature, etc. Occur. Such a system ultimately requires careful selection of materials and strict implementation of appropriate industrial control, but management costs increase if production activities are inappropriate or insufficiently prepared. In addition, a Zener barrier will be installed at the rear stage of the transformer in any electrical element such as a control keyboard that should be placed outside the encapsulated area, that is, in a dangerous area where there is an explosion risk. This component limits the energy of the external electric member so as not to generate a spark. Zener barriers are mainly composed of fuses.

  Similarly, the electronic board is secured by a fuse-type member that avoids any misconnection or any start-up of the motor if the conditions necessary for proper operation of the motor are not met. However, since such a fuse-type element is embedded in the resin, when this element is started, the control device becomes unusable because there is no reset means.

  Therefore, the object of the present invention is to limit the size of the assembly and eliminate all types of components that cause failure in the most severe situations, such as transformers or diaphragm type soft keyboards, which currently have some drawbacks. Another object of the present invention is to propose a new control device designed to perform effective electrical safety management without incorporating an irreversible operating element such as a fuse or a varistor into an insulating material.

  Another object of the present invention is to propose a control device with a built-in intelligent continuous monitoring means via a microcontroller which makes it impossible to start the motor in the event of a minimum or maximum failure voltage that can destroy the motor. is there.

  Another object of the present invention is to propose a highly reliable control device by eliminating the terminals of the electronic board and rationalizing the electrical connection.

  Another object of the present invention is to propose a control device capable of withstanding a high temperature of up to 50 ° C. under a normal use condition with a relative humidity of 95% or more.

  Another object of the present invention is to provide an encapsulation protection mode “m”, which is considered the simplest and most economical, especially if possible using a standard plastic case, outside the encapsulation area if necessary. It is intended to propose a control device designed to enable extremely safe operation in an explosive atmosphere of the gas “G” type, mainly in combination with an intrinsic safety mode “i” for the parts of Furthermore, the complete encapsulation of the electrical part allows it to be used in a dust “D” (Dust) type environment which is much more restrictive and imposes a protection index equal to at least IP65.

  Another object of the present invention is to standardize single motor control regardless of the asymmetric motor used in the standard or EX type.

  Another object of the present invention is to propose a control device capable of operating within a wide voltage range in order to solve the problem that the global distribution network is extremely heterogeneous and very diverse.

Thus, the present invention includes at least one electronic board and relay for motor supply control, and the electronic board includes at least one microcontroller that analyzes electrical parameters of the distribution network such as frequency and voltage, The parameters are matched to the proper operation of the motor to control the relays located in the motor supply network, preferably an asymmetric single phase or three, where the board and relay are housed inside the case. For the purpose of electronic control equipment for phase motors,
The relay is a static relay, and the electronic board
A capacitive impedance which is supplied from the motor supply network and serves to reduce the supply voltage of the other parts of the device;
-Comprising at least one start and / or stop switching member of the device which can be controlled via the control member, the control member itself being preferably controlled by manual movement control means.

  By replacing the transformer with a capacitive power supply and performing intelligent management with a microcontroller, a small control device is obtained that is perfectly reliable in operation and that is particularly stable over time.

  According to a preferred embodiment of the present invention, an assembly composed of an electronic board and a static relay is embedded in an insulating material block such as resin.

  According to another preferred embodiment of the present invention, an assembly consisting of an electronic board and a static relay is housed in a “d” -type exterior, such as an aluminum exterior composed of a motor terminal case in particular.

  The one or more switching members are preferably composed of a switch having a flexible blade that can be controlled via a magnet.

  The invention will be better understood upon reading the following description of embodiments with reference to the accompanying drawings.

  The device to which the present invention is directed has the role of allowing electronic control of a suitably asymmetric single-phase or three-phase motor, which is configured especially for use in explosive atmospheres.

  This device is preferably housed in an antistatic case 1 made of a plastic insulating material, and is generally an electronic device that controls the supply of a motor and may or may not permit the supply according to the characteristics of the distribution network. A substrate 2 and a static relay 3 are included.

  According to a feature of the invention, the electronic substrate 2 includes a capacitive impedance 4, a blade switch 5 controlled via a magnet 6 and a push button 12, and a microcontroller 7. The control device is supplied from a motor supply network. The control device is connected to a phase line that itself is connected to the distribution network. The voltage of the distribution network can be 70 to 260 volts for a single phase and a connection risk of 400 volts for a three phase at a frequency of 50 or 60 hertz.

  Therefore, in order to allow the apparatus to control the motor supply from such an AC network, it is necessary to reduce the voltage to obtain a low DC voltage in order to supply the entire logic circuit of the electronic board 2. . The solution considered here consists of a capacitive impedance 4, unlike the prior art which uses a transformer to reduce the supply voltage. The capacitive impedance 4 consists of two capacitors connected in series, preferably made of plastic. Capacitive impedance 4 is, for example, when supplying a single-phase motor, and can operate without overheating, including the case of a high voltage of about 260 volts, capacity 1 μF, type X2275VAC, size 23 × 20 × 9 mm It consists of a series connection capacitor. In the case where the present invention is applied, since the control current intensity is very weak at less than 10 mA, the amount of resin can be minimized and the ultra-small capacitor which is the least bulky in this technology can be used. In any case, these capacitors are capable of operating at 2/3 of the component's maximum power according to electrical safety requirements in explosive atmospheres as defined by current standards that impose a superheat limit at the maximum working voltage value.

  When the capacitance value of the capacitor is doubled, the current intensity increases and the capacitance increases exponentially. Moreover, if current consumption is minimized, the capacity is advantageously utilized at maximum efficiency. The same reasoning can be used when the number of capacitors is increased due to a demand for further increasing the current intensity.

  Such capacitive impedance is connected to the phase line of the motor in the case of a single phase motor, so that the supply voltage of the device can be lowered to a value of less than 25 volts. Between the capacitive impedance 4 and the neutral line, a diode rectifier bridge is inserted, which precisely determines a rectified voltage value of 5 volts. Another capacitor may be arranged in the circuit in the subsequent stage of this bridge to smooth the current and to short-circuit any AC residual voltage. The purpose is therefore to obtain a DC voltage with a value of a few volts by such a plurality of components, this voltage in particular serving to supply a microcontroller 7 of the PIC16C620 type.

  The microcontroller 7 also supported by the electronic board 2 analyzes the electrical parameters of the distribution network such as frequency and voltage so that these parameters are adapted to the normal operation of the motor and the motor supply network, in particular the motor. The static relay 3 arranged on the phase line is controlled. The static relay 3 fulfills the function of allowing or disabling the current that serves to supply the motor according to the characteristics of the current supplied by the distribution network. The microcontroller 7 also serves to determine the motor operating time in certain cases.

  The microcontroller 7 plays a leading role especially in the function of monitoring electrical values at the input of the electronic board. In fact, the microcontroller constantly checks the parameters of the power supply to make the static relay uncontrollable or make it impossible to start the electrical safety means in front of the plant.

  Such monitoring is intended to adjust the voltage threshold parameters that make the motor safe within defined limits (such as fault detection, information recovery, relay timing adjustment, etc.) or to perform other intelligent logic functions.

  Therefore, the “analog or comparator” input of the microcontroller is used to analyze the parameters required for monitoring.

  The voltage drop of the power supply is implemented by the following equation depending on the frequency due to the capacitive impedance.

  As a result, the voltage varies depending on the frequency. By monitoring the frequency, the voltage of the network is identified (indirectly by measuring the reduced voltage) and the microcontroller manages the minimum and maximum threshold voltages that command to prohibit starting the motor.

  The device is started and stopped by a switch 5 having a flexible blade that can be controlled via a push button 12 and a magnet 6. The push button 12 may be replaced by any other movement control means, preferably manual, but the push button solution remains the preferred solution for the intended application. In order to meet the safety standards required in the case of an explosive environment, the assembly composed of the electronic substrate 2 and the static relay 3 is encapsulated, that is, embedded in an insulating material block 8 such as a resin. Due to the small size of the capacitive impedance 4 and the arrangement of the static relay 3 with respect to the electronic substrate, a small assembly can be obtained and the amount of insulating material used can be reduced.

  The definition of encapsulation is a method of encapsulating one or more electrical devices by suitable means, such as coating or packaging, using an epoxy or polyurethane resin type insulating compound. Similarly, coating is a method of completely covering one or more electrical devices, consisting of flowing an insulating compound through the device in a mold and removing the encapsulating device from the mold after the compound has solidified. Container filling is a coating method in which a mold remains attached to one or more encapsulated electrical devices. Accordingly, the encapsulation method used is a container packing method in which the mold remains attached to the encapsulated electrical device after flowing the insulating material. Therefore, it is different from the coating technique in which the electric device is taken out from the mold after flowing the insulating material into the mold. In this way, the height of the resulting resin is about 26 mm, and the height of the electronic board and static relay is only about 8 mm. In this configuration, the device includes at least two flexible blade switches 5, each switch being supported by a mount 11 so as to be near the surface of the insulation block 8, allowing switch control. In addition, it is configured to perform switching that is relayed remotely or in the vicinity without an electrical contact such as the magnet 6. An equivalent device consists of removing the insulation and housing the assembly in a “d” type sheath.

  Possible alternative embodiments that do not require a re-examination of the technical choice of the electronic substrate to be encapsulated are protection by encapsulation “m”, or other intrinsically safe mode “i” or explosion-proof exterior It is to relay the control member while performing protection by combination with “d”. Thus, relaying the sensor outside the encapsulation area of the electronic means can easily be considered, and preferably the encapsulated control member itself is likewise controlled by manual or automatic mobile control means.

The static relay 3 includes at least one thyristor 3A, and preferably includes two thyristors arranged in a staggered manner. The thyristor is welded to a plate 10 made of a conductive material such as aluminum, and the plate serves as a heat sink for the use case and has sufficient heat exchange to avoid overheating in the smallest possible space. Has been customized to do. Therefore, the support plate 10 is “U” shaped with a thickness of 1.5 mm and provides the maximum heat dissipation surface. The assembly is thus housed in the case 1 and the case is
A bottom 1A including an insulating block 8 in which the electronic board 2, the static relay 3, and its radiator are embedded;
A cover 1B fixed to the bottom 1A by locking without using a tool.

  By placing one or more thyristors on the conductive material plate 10, this plate is first placed on the bottom of the case, and then the electronic substrate containing the assembly of the other elements is overlaid on this plate. Can do. Thereafter, the electronic substrates are joined by welding. When the assembly is placed at a predetermined position, each element can be encapsulated by flowing an insulating material inside the case.

  As described above, when the electrical material is encapsulated in accordance with the standard EN50022, the encapsulated portion of the electrical material, that is, the enclosed Ex component, includes a protective exterior (container packing) made of an insulating material, and the exterior thickness is at least If it is 1 mm, no minimum value is imposed on the thickness of the layer between the protective sheath and any part or conductor. For this reason, the amount of resin is further optimized by setting the thickness of the case exterior to at least 1 mm. Thus, the radiator is disposed in direct contact with the bottom of the case.

  In order to be able to start and stop such a device, a magnet 6 is provided which cooperates with a switch 5 having a flexible blade, as described above. Each of the magnets 6 is supported by a push button 12 that is incorporated in the cover 1 </ b> B of the case 1 and biased by a spring 14. One of the push buttons 12 serves to start the device and the other serves to stop the device. These flexible blade switches allow in particular the operation of the microcontroller 7.

  As described above, the electronic board is directly supplied by the motor supply network. For this reason, the assembly is arranged on the phase line of the motor in the case of a single phase motor. For this reason, the control device can be supplied from the motor supply network after the power supply voltage is lowered due to the capacitive impedance. The capacitive impedance can accept variable voltages in the wide range of 70 to 260 volts, especially at variable frequency values of 50-60 Hertz. When the voltage is dropped from 8 to 25 volts, the microcontroller 7 analyzes the electrical parameters of drop voltage and frequency to determine the input voltage value exponentially, and when this voltage is outside the predetermined range Disables control of the static relay and avoids any damage to the motor. Static relays are also placed on the motor's phase line in accordance with electrical safety standard obligations that direct disconnection at all phases.

  In order to obtain a kit assembly, the bottom 1A of the case includes a chamber from which the cable of the distribution network reaches and from which the motor cable originates, and this chamber is separated by a partition wall 13 from the insulation block 8 Has been separated from. The partition wall includes a plurality of notches near the upper edge for facilitating fixing of the cable. The case also includes a press-euplet into which a cable connectable to the power distribution network and a starting cable toward the motor are introduced. In a more elaborate variant, consider relaying the connection to a bornier outside the capsule area but staying inside the exterior, thereby enabling optional wiring independent of the electronic case be able to. For protection in explosive environments, this terminal should be protected in mode “e” with enhanced safety. This mode assumes in particular that the exterior is airtight with a protection index equal to at least IP54. For this reason, the case has a groove around it, and in some cases, the case can receive an airtight means such as a flexible packing that guarantees a necessary degree of protection.

  Furthermore, in order to constantly monitor the operation of the device, the electronic board 2 has a dichroic diode 15 protruding from the insulating block 8. The two-color diode 15 is covered with a light guide means 16 coupled to the cover 1B of the case 1 so that an optical signal sent from the diode 15 can be seen from the outside of the case 1. In this way, any failure can be continuously visualized in real time. Similarly, by controlling the static relay continuously in real time, if the current does not correspond to the characteristics that make the motor fully operable, no current will flow through the motor.

  In order to facilitate positioning of the case 1 on any support, the bottom 1A of the case 1 can be provided with elastically deformable legs 9 that cooperate with the support.

  The operation of such a control device is very simple. Once the motor and distribution network are connected, the device can be started by simply actuating the start push button on the device. By actuating such a push button, the magnet attached to the push button can attract a plate equipped with a switch 5 with a flexible blade such as an REED sphere. In that case, the microcontroller 7 can be supplied with a low value direct current via a rectifier bridge that adjusts 5 volts after the capacitive impedance and can analyze the electrical parameters of the distribution network. If the supply voltage matches the normal operation of the motor, the microcontroller 7 controls the static relay 3 to pass current towards the motor. The motor is generally operable for a predetermined time corresponding to the time programmed in the microcontroller 7. When the predetermined time has elapsed, the motor is automatically stopped. In the case of an emergency stop, another push button can be activated to control the motor stop.

  In the case of a three-phase motor, a static relay 3 is provided for each phase line of the motor.

It is a perspective view which shows the component of the control apparatus by this invention in a disassembly / assembly position. It is sectional drawing of the control apparatus by this invention.

Claims (12)

At least one microcontroller (7) comprising at least one electronic board (2) for motor supply control and a relay (3), wherein the electronic board (2) analyzes electrical parameters of the distribution network such as frequency and voltage. ) In order to control the relay (3) arranged in the motor supply network so that the parameters are adapted to the proper operation of the motor, preferably the substrate (2) and the relay (3) Is an electronic control device for an asymmetric single-phase or three-phase motor housed in the case (1),
The relay (3) is a static relay, and the electronic board (2)
A capacitive impedance (4) which is supplied from the motor supply network and serves to reduce the supply voltage of other parts of the device;
-Comprising at least one start and / or stop switching member (5) of the device which can be controlled via the control member (6), the control member itself being preferably controlled by manual movement control means Features device.   Device according to claim 1, characterized in that the assembly consisting of the electronic board (2) and the static relay (3) is embedded in an insulating material block (8) such as a resin.   2. Device according to claim 1, characterized in that the assembly consisting of the electronic substrate (2) and the static relay (3) is housed in a "d" -type sheath such as an aluminum sheath.   One or more of the switching members (5) preferably comprise a switch (5) with a flexible blade that can be controlled via a magnet (6). A device according to claim 1.   At least two flexible blade switches (5), each supported by a beerceaux (11) so as to be close to the surface of the insulation block (8) to allow control by a magnet (6) 5) The device according to any one of claims 2 to 4, characterized in that   Device according to claim 1, characterized in that the static relay (3) comprises at least one thyristor (3A) welded to a conductive material plate (10) such as aluminum which acts as a radiator. .   2. Device according to claim 1, characterized in that the capacitive impedance (4) consists of two series capacitors, preferably made of plastic. Case (1)
A bottom (1A) comprising an insulating material block (8) in which the electronic substrate (2) and the static relay (3) are embedded;
Device according to claim 1, characterized in that it comprises a cover (1B) fixed to the bottom (1A) by locking without using a tool.   The cover (1B) of the case (1) has two push buttons (12), one for starting the device and the other for stopping the device, each push button being a flexible blade switch (5 9) A device according to claim 8, characterized in that it has a magnet (6) for controlling.   The bottom (1A) of the case includes a chamber through which the cable of the power distribution network reaches and from which the cable of the motor starts, and this chamber is separated from the insulating material block (8) by a partition wall (13). The apparatus according to claim 8.   The electronic board (2) has a dichroic diode (15) protruding from the insulating block (8), and the light guide means (16) coupled to the diode (15) to the cover (1B) of the case (1). ), So that the optical signal emitted by the diode (15) is visible from the outside of the case (1).   12. Device according to any one of claims 1 to 11, characterized in that the case (1) is an antistatic plastic.

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