EP1698032A1 - Procede de fonctionnement d'un circuit convertisseur d'un lave-linge ou d'un seche-linge - Google Patents

Procede de fonctionnement d'un circuit convertisseur d'un lave-linge ou d'un seche-linge

Info

Publication number
EP1698032A1
EP1698032A1 EP03785867A EP03785867A EP1698032A1 EP 1698032 A1 EP1698032 A1 EP 1698032A1 EP 03785867 A EP03785867 A EP 03785867A EP 03785867 A EP03785867 A EP 03785867A EP 1698032 A1 EP1698032 A1 EP 1698032A1
Authority
EP
European Patent Office
Prior art keywords
converter circuit
dynamo
electric machine
voltage pulse
voltage
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Withdrawn
Application number
EP03785867A
Other languages
German (de)
English (en)
Inventor
Hasan Gökcer ALBAYRAK
Lothar Knopp
Thomas Ludenia
Jörg SKRIPPEK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1698032A1 publication Critical patent/EP1698032A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08Reluctance motors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/01Asynchronous machines

Definitions

  • the invention relates to a method for operating a converter circuit, in particular a pulse-width-modulated frequency converter circuit with a DC voltage intermediate circuit, which controls a plurality of winding branches of a multi-phase dynamo-electric machine, in particular a three-phase asynchronous motor of a laundry treatment device, the method controlling one or more parameters of the dynamo-electric Machine determined. Furthermore, the invention also relates to a converter circuit for carrying out the method and a laundry treatment device with a converter circuit for controlling a multi-phase dynamo-electric machine which in particular drives a drum rotatably mounted in the laundry treatment device.
  • Converter circuits and methods for operating a converter circuit that control a dynamo-electric machine are known in the prior art in numerous configurations.
  • Converter circuits are used to convert from an input-side single-phase or multi-phase AC voltage to an output-side single-phase or multi-phase AC voltage, which is different in frequency, number of phases and / or amplitude from the input-side AC voltage.
  • frequency converter circuits With converter circuits that can convert the frequency of the AC voltage, so-called frequency converter circuits, any voltage frequencies and / or voltage amplitudes can be generated on the output side.
  • Frequency converter circuits are also used to control the speed of dynamo-electrical machines, for example three-phase asynchronous motors.
  • Such asynchronous motors are extremely low-maintenance, have high limits and can be operated particularly quietly. Because of these advantages, such speed-controlled dynamo-electric machines are also used in laundry treatment devices, such as household washing machines or household laundry dryers. With such machines, for example, one can be rotated in the laundry treatment device stored laundry drum driven.
  • pulse-width-modulated frequency converter circuits are used to control three-phase asynchronous motors.
  • Such frequency converter circuits generally each have a line filter, a DC voltage intermediate circuit, a power stage with a so-called driver stage and a microcontroller or a digital signal processor as components. The components are usually grouped together on one assembly, with the line filter, for example, being able to form a separate assembly.
  • converter circuits for controlling and / or regulating the dynamo-electric machine also use sensor elements for registering the voltage, current and / or temperature of the converter circuit and / or devices for registering parameters of the driven dynamo-electrical machine.
  • the parameters can change, in particular as a result of heating during operation of the machine.
  • Such sensor elements or such devices are partially integral assemblies of the converter circuit and are used for performance-optimized operation of the dynamo-electric machine.
  • the microcontroller or the digital signal processor can be used to determine control and / or control variables using individual calculation instructions or complex mathematical machine models, which control is optimal for performance in every operating state of the machine of the machine.
  • the invention is therefore based on the object of providing a method for operating a converter circuit or a converter circuit for carrying out a method, the converter circuit in particular controlling and / or regulating a dynamo-electric machine of a laundry treatment device, in which the parameters of the dynamo-electric machine can be detected with simple and inexpensive means and by means of these parameters a performance-optimized control and / or regulation of the dynamo-electric machine and / or a preventive detection of malfunctions and errors in the converter circuit and / or the dynamo electrical machine can be done.
  • This object is achieved according to the invention by the features of the method according to claim 1 or with the converter circuit for carrying out the method according to the independent claim 11 or with the laundry treatment appliance according to the independent claim 12.
  • the converter circuit which controls a multi-phase dynamo-electric machine with a plurality of winding branches, advantageously has a sequence control tion, which operates the method according to the invention, the method comprising the steps that at least one voltage pulse or a voltage pulse sequence is generated by a power stage of the converter circuit for controlling at least one winding branch, with no rotating field due to the voltage pulse or the voltage pulse sequence dynamo-electric machine is generated and the control of the winding branch takes place before another generation of a rotating field of the dynamo-electric machine is effected by the converter circuit, and that at least one temporal and / or electrical parameter of the dynamo-electric machine during the control by a Time, voltage and / or current measuring device of the converter circuit is determined.
  • Such procedural steps allow at least one temporal and / or electrical parameter of the machine to be determined prior to the intended operation or respective activation of the dynamo-electrical machine, in which the converter circuit causes a rotating field in the dynamo-electrical machine.
  • a performance-optimal control which is adapted to the current machine situation, can advantageously be effected preventively before a respective activation of the dynamo-electric machine, and likewise a malfunction and / or an error of the components involved can be activated before the activation of the machine can also be detected preventively.
  • a current measuring device of the converter circuit is used to control at least one winding branch, which does not generate a rotating field in the dynamo-electric machine, and to measure the current developing in the power stage or in the respectively controlled winding branch of the dynamo-electric machine , Furthermore, a time duration is determined by means of a time measuring device of the converter circuit, which is required from the start of such a control until a predetermined current value is reached. Such a time period is a temporal parameter of the dynamo-electric machine or of the controlled winding branch of the dynamo-electric machine.
  • Such a temporal Parameters can be determined particularly easily by means of a microcontroller or a digital signal processor, which is usually already part of a converter circuit for controlling or regulating the power level. Thus, no further and cost-intensive components for determining a parameter of the dynamo-electric machine are required.
  • the inductance, which the controlled winding branch has, is determined in a further method step as a function of the temporal parameter, such a determination being carried out particularly easily with a microcontroller or with a signal processor using an appropriate allocation table or using a mathematical machine model can.
  • the inductance of the winding branch represents an electrical parameter of the dynamo-electrical machine.
  • the inductance influences the power output of the dynamo-electrical machine. Since the induction of a winding branch of the dynamo-electric machine is determined prior to actuation of the machine, in which a rotating field is generated on the machine, the control and regulating parameters can advantageously be adapted as a function of the induction before this actuation. As a result, optimum power utilization of the dynamo-electric machine can be achieved with every control to generate a rotating field.
  • the electrical resistance of a winding branch can be determined as a further electrical parameter of the dynamo-electrical machine.
  • the further development contains further steps for determining an effective voltage and a maximum current value, which occur during the control of at least one winding branch of the dynamo-electrical machine in the power stage of the converter circuit, such control not generating a rotating field in the dynamo-electrical machine.
  • the on and / or off times are generated with a time and / or voltage measuring device of the converter circuit Voltage pulse or a generated voltage pulse sequence and the amplitude of the voltage pulses measured.
  • the current developing in the power stage is determined with a current measuring device and the temporal change in the current is determined with a further device in the converter circuit.
  • the maximum current is determined by the current value which arises when the current value no longer changes or the change in current over time falls below a predetermined limit value.
  • the electrical resistance of the controlled winding branch then results from the effective voltage and the maximum current value.
  • a further embodiment of the invention consists in that at least one of the temporal and / or electrical parameters of the dynamo-electrical machine is compared with a number of predetermined parameter values which are assigned to different variants of the dynamo-electrical machine. Based on the comparison, the variant of the dynamo-electric machine is determined. Furthermore, a selection of control and regulating parameters that are assigned to the variant is made from a set of control and regulating parameters for different variants of the dynamo-electric machine. This is particularly advantageous because such a converter circuit can thus be used for different variants of the dynamo-electric machine, special control and regulating parameters being used for the control and / or regulation for each of the variants. This means that each variant of the dynamo-electric machine can be controlled with just one converter circuit for optimum performance.
  • a further advantageous development of the invention further includes steps in which at least one temporal and / or electrical parameter of the dynamo-electric machine is compared with a tolerance value range assigned to the parameter and thus for an error of the dynamo-electric machine with a suitable comparison device of the converter circuit and / or the converter circuit is closed.
  • the error is present when one of the temporal and / or electrical parameters deviates from the respective tolerance range.
  • the method according to the invention advantageously includes a step in which an output of a voltage pulse sequence of the power stage of the converter circuit for generating a rotating field of the dynamo-electric machine is prevented with a switch-off device of the converter circuit if an error is present.
  • This further development is particularly favorable because this further development can effectively and reliably avoid failure of individual components of the converter circuit and / or the dynamo-electric machine.
  • a further embodiment of the invention includes that in a further step a voltage pulse sequence is determined as a function of a temporal and / or electrical parameter, the voltage pulse sequence from the power stage of the converter circuit serving to form a rotating field of the dynamo-electric machine.
  • a control that is adapted to the current operating state and is optimized for performance to operate a dynamo-electric machine can be effected very easily. This is particularly the case if the temporal and / or electrical parameters can change during the intended operation of the dynamo-electrical machine.
  • the determination of the voltage pulse sequence can be advantageous, in particular in the case of converter circuits with a microcontroller or a signal processor using an allocation table and / or a mathematical machine model taking into account the temporal and / or electrical parameters. It is particularly advantageous to take the inductance of one or more winding branches into account as an electrical parameter, because the power output of a dynamo-electric machine depends essentially on the inductance.
  • a voltage pulse sequence for operating the dynamo-electric machine is determined as a function of a predetermined operating temperature value.
  • predefined and known operating conditions can advantageously also be taken into account in the case of a power-optimized control.
  • the voltage pulse sequence is preferably determined using a corresponding allocation table and / or a mathematical machine model, which are part of a microcontroller or a signal processor of the converter circuit.
  • a converter circuit with a power stage which is used to generate voltage pulses and to control a multi-phase dynamo-electrical machine, and with devices for determining at least one temporal and / or electrical parameter of the dynamo-electrical machine advantageously contains a sequence control, that controls the inventive method and / or the further developments.
  • the devices of the converter circuit required for controlling the method according to the invention and for determining the time and / or parameters are simple and inexpensive, and are Circuit easy to integrate. The converter circuit can thus be manufactured particularly inexpensively.
  • a laundry treatment device in particular a household washing device or a household laundry dryer, contains a converter circuit of the type shown for controlling a multiphase dynamo-electric machine, which in particular drives a drum rotatably mounted in the laundry treatment device.
  • a laundry treatment device can advantageously be inexpensively equipped with a converter circuit for driving the drum, taking into account compliance with the regulations of the international electrical standards.
  • FIGS. 2-4 block diagrams of a converter circuit in which the motor winding branch of the dynamo-electrical machine that is controlled is highlighted,
  • FIG. 6 shows a time course of current and voltage when controlling a motor winding branch to determine an electrical parameter of the dynamo-electrical machine.
  • FIG. 1 shows a block diagram of a converter circuit 3, which is used to control a multi-phase dynamo-electric machine 13, the converter circuit being designed as a frequency converter circuit 3 and the dynamo-electric machine 13 as a three-phase asynchronous motor 3. Furthermore, in the description of the exemplary embodiment, the converter circuit 3 with the frequency converter circuit 3 and the dynamo-electric machine 13 as Denoted asynchronous motor 13. However, the invention is not limited to such a special embodiment, the converter circuit 3 and the dynamo-electric machine can also be of a different type.
  • the asynchronous motor 13 drives a drum rotatably mounted in a laundry treatment device.
  • the winding phases 14, 15 and 16 of the asynchronous motor are connected to one another in a so-called star connection.
  • Other circuit designs of the winding phases, such as a so-called delta connection, are also possible.
  • the frequency converter circuit 3 is combined in one assembly and contains at least one rectifier circuit 2, which is connected on the output side to a power stage 12, to form a so-called DC voltage intermediate circuit. Furthermore, the frequency converter circuit 3 contains a microcontroller 5, which contains at least analog-digital signal converters 6 and 8, so-called AD converters, digital outputs 9, which are connected to a so-called driver stage 10, and a memory device 7. The input side is
  • Rectifier circuit 2 connected to a single-phase line filter 1.
  • the line filter 1 is designed as a component separate from the frequency converter circuit, it also being possible to integrate individual components of the line filter 1 in the frequency converter circuit 3.
  • the frequency converter circuit 3 contains a voltage divider 4, which in connection with the AD converter 6 represents a voltage measuring device, and via a so-called shunt resistor 11, which in connection with the AD converter 8 serves as a current measuring device.
  • a time measuring device can be represented in connection with a corresponding sequence control by the microcontroller 5, since the microcontroller 5 has devices for generating a time cycle and for evaluating events or interrupts.
  • the driver stage 10 is connected on the output side to the high-performance transistors (so-called IGBTs, insulated gate bipolar transistors) T1 to T6 of the power stage 12.
  • IGBTs high-performance transistors
  • the IGBT's T1 to T6 can be switched individually, so that at the phases uv, uw and vw, which result from two switched outputs u and v, u and w or v and w of the frequency converter circuit 3, a pulse white - Ten-modulated voltage pulse or a pulse-width-modulated voltage pulse sequence of different polarity can be generated.
  • Each voltage pulse has the voltage U zwk of the DC voltage intermediate circuit and the effective voltage of the voltage pulse sequence results from the switching on and off times of the individual voltage pulses and the intermediate circuit voltage U zwk .
  • the outputs u, v and w of the frequency converter circuit 3 are with the
  • the intermediate circuit voltage U ZWk that is present during operation of the frequency converter circuit 3 is determined with the voltage measuring device of the frequency converter circuit 3.
  • the control of individual winding branches of the stator of the asynchronous motor 13 is shown in FIGS. 2 to 4, the IGBTs T1 and T6 being activated to control a winding branch consisting of the winding strands 14 and 16 or the phase uw (current path 17).
  • the current which forms in the DC voltage intermediate circuit is determined with the current measuring device of the frequency converter circuit 3.
  • the IGBTs T1 and T4 are used to control the winding branch or phase uv (winding path 18) consisting of the winding strands 14 and 15, and accordingly to control the winding branch or phase vw consisting of the winding branches 15 and 16 (current path 19) IGBT's T3 and T6 switched on.
  • the current which forms when these winding branches are driven is also determined with the current measuring device of the frequency converter circuit 3.
  • the IGBT's T2 and T5 are switched on instead of the IGBT's T1 and T6, the IGBT's T2 and T3 instead of the IGBT's T1 and T4 or the IGBT's T4 and T5 instead of the IGBT's T3 and T6.
  • voltage pulse sequences of the type are generated which generate a magnetic rotating field in the asynchronous motor 13, as a result of which a voltage is induced in short-circuited winding strands of the rotor of the asynchronous motor 13 or a magnetic field on the Rotor is generated and ultimately a rotation of the rotor is effected.
  • the direction of rotation of the rotor depends on the respective current direction in the winding branches of the stator of the asynchronous motor 13.
  • temporal and electrical parameters of the asynchronous motor 13 are determined, on the one hand to determine the variant of the connected asynchronous motor 13 and thus to select the control and regulating parameters assigned to the variant or to adapt the control and regulating parameters to the current operating state of the asynchronous motor 13 or to determine a motor fault or a motor fault so that subsequent activation of the asynchronous motor 13 can be prevented.
  • a voltage pulse sequence 20 or 24 is generated in the phase uw or in the winding phases 14 and 16 of the asynchronous motor 13 in which the IGBT's T1 and T6 of the power level can be switched on and off at the same time. Since the other IGBTs remain switched off, no rotating field is generated in the asynchronous motor 13 during the generation of the voltage pulse sequence 20 or 24, and thus no rotation of the rotor of the asynchronous motor 13 is caused.
  • Voltage pulse train 20 forms a current 23 in the winding phases 14 and 16.
  • a current profile over time is shown in FIG. 5.
  • the temporal current profile 23 is crucially dependent on the inductance of the controlled winding phases 14 and 16.
  • the current value increases during a voltage pulse or a switch-on phase of the IGBT's T1 and T6 and falls slightly between two voltage pulses or during the switch-off phases, the increase being more pronounced than the decrease. Since the rotor of the asynchronous motor 13 is not set in rotation during such a control of the winding branches 14 and 16, advantageously no so-called counter voltage is induced in the winding phases 14 and 16.
  • the current profile 23 is therefore not influenced by the counter voltage.
  • Such a type of control is thus particularly suitable for determining a temporal and / or electrical parameter of the asynchronous motor 13, which is determined in a further step with the time measuring device of the microcontroller 5, with the current and / or voltage measuring device of the frequency converter circuit 3.
  • a step for determining a parameter of the asynchronous motor 13 includes a step in which the current which forms in the phase uw is measured with the current measuring device of the frequency converter circuit 3. The measured current is continuously compared with a predetermined current limit value lumit, which is stored in the memory device 7 of the microcontroller.
  • the comparison device required for this is an integral part of the microcontroller 5.
  • the time period from the start to the generation of the voltage pulse sequence to the point in time t u is determined in a further step Phase uw forming current imit reaches the predetermined current limit.
  • the time period (t uw - 1 0 ) is stored in the memory device 7 of the microcontroller 5 and represents a time parameter of the winding branch of the winding phases 14 and 16 or of the asynchronous motor 13.
  • an allocation table with a number of inductance values and respectively assigned predetermined time periods is stored in the memory device 7.
  • the determined time period (t uw - 1 0 ) of the controlled winding branch with the winding phases 14 and 16 is compared in a subsequent step with the predetermined time periods and a time period determined from the predetermined time periods which is closest to the measured time period.
  • the value of the inductance of the controlled winding branch results from the allocation table corresponding to the predetermined period of time and the value of the inductance is stored in the memory device 7.
  • Such an inductance represents an electrical parameter of the controlled winding branch or the asynchronous motor 13.
  • the method has one step in an alternative embodiment of the exemplary embodiment which a voltage pulse sequence 24 with the power stage 12 in connection with the microcontroller 5 and the driver stage 10 is generated in the phase uw in which the IGBT's T1 and T6 of the power stage are switched on and off simultaneously.
  • the other IGBTs remain switched off, so no rotating field is caused in the asynchronous motor 13 during the generation of the voltage pulse train 24.
  • the temporal current profile 25 which forms during the generation of the voltage pulse sequence 24 is shown in FIG.
  • the voltage pulse sequence 24 is generated before any other generation of a rotating field on the asynchronous motor 13 is effected by the frequency converter circuit.
  • the effective voltage U ⁇ ff which is generated by the power stage 12 of the frequency converter circuit 3 is determined in a further step by the voltage of the DC intermediate circuit U 2Wk with the voltage measuring device of the frequency converter circuit 3 and the duty cycle dt ⁇ in and / or switch-off times dt aU s of the voltage pulses can be measured with the time measuring device of the microcontroller 5.
  • the effective voltage U eff is then calculated by the microcontroller 5 according to the following formula:
  • the current which forms in the phase uw or in the controlled winding branch is measured with the current measuring device of the frequency converter circuit 3 and with a device of the Microcontroller 5 averaged.
  • the change in the average current ⁇ I is calculated using two successive average current values I n and I n + ⁇ , which were determined at the times t n and t n + ⁇ , the following applies:
  • a maximum current value Im ax of the current profile 25 is determined, at which the current forming in the phase uw no longer changes.
  • the value of the change in the current ⁇ I with a predetermined limit value, which is stored in the storage device 7 of the microcontroller 5, is continuously compared with a device of the microcontroller 5 until the
  • the resistance R of the controlled winding branch is calculated in a subsequent step with a device of the microcontroller 5 from the effective voltage U er and the maximum current value I max according to the following regulation:
  • the calculated resistance R is an electrical parameter of the winding branch with the winding phases 14 and 16 or the asynchronous motor 13 and is stored in the memory device 7 of the microcontroller 5.
  • the steps described above are repeated, with a first repetition generating a voltage pulse sequence with the power stage 12 in the phase uv or in the winding phases 14 and 15 of the asynchronous motor 13, in which the IGBT's T1 and T4 of the power level are switched on and off simultaneously and the other IGBTs are switched off.
  • a voltage pulse sequence with the power stage 12 in the phase vw or in the winding phases 15 and 16 of the asynchronous motor 13 is generated, in which the IGBT's T3 and T6 of the power stage are switched on and off simultaneously and the other IGBTs are turned off.
  • Each repetition contains the above steps for determining a temporal and electrical parameter of the winding branch being controlled. After their determination, these parameters are stored in the memory device 7 of the microcontroller 5. Temporal and electrical parameters are thus determined for each winding branch of the asynchronous motor 13.
  • the corresponding temporal and electrical parameters of the winding phases 14, 15 and 16 can also be calculated with the microcontroller 5 using an equation system from the temporal and electrical parameters of the winding branches. If the winding phases of the three-pole asynchronous motor 3 are connected to one another in a delta connection, the step for calculating the parameters of the winding phases is omitted, since in this case one winding branch corresponds to one winding phase.
  • a further allocation table with a number of control and regulating parameter sets and respectively assigned predetermined temporal and / or electrical parameter sets is stored in the microcontroller 5 in the memory device 7, a predetermined temporal and / or electrical parameter set determining an embodiment variant of an asynchronous motor 13 in each case.
  • a previously determined temporal or electrical parameter of the asynchronous motor 13 is compared with the predetermined parameter sets by means of a comparator device of the microcontroller 5 and a closest predetermined parameter set is determined, the temporal or electrical parameters of the asynchronous motor 13 being the temporal or electrical Correspond to parameters of a winding branch or averaged values of the temporal or electrical parameters of all controlled winding branches.
  • the variant of the controlled winding branch results in the following step from the assignment tion table corresponding to the predetermined parameter set and thus also a control parameter set associated with the variant of the asynchronous motor 13 is selected, which is used for the further control and / or regulation of the asynchronous motor 13.
  • a previously measured and stored temporal or electrical parameter of a winding branch with an upper and lower limit value assigned for the respective parameter type i.e. with an assigned tolerance value range for, for example, permissible induction values or permissible resistance values of a winding branch, with a comparison device of the microcontroller 5 compared.
  • the assigned limit values are read out from the memory device 7 using a device of the microcontroller 5 as a function of the previously recognized variant of the asynchronous motor.
  • the comparison device outputs an error value that indicates that the temporal or electrical parameter lies outside its assigned tolerance value range.
  • the error value is used to infer a machine error, an unsuitable operating state of the asynchronous motor 13 or the connected frequency converter circuit 3. Such an operating state occurs, for example, in the event of a short circuit or winding or a short circuit in the winding branch, the respective connecting lines or the power stage 12.
  • the comparison of a temporal or electrical parameter with an assigned limit value is repeated for each winding branch, with each repetition a temporal or electrical parameter of a respective further winding branch being compared with the same upper and lower assigned limit value.
  • all winding branches or winding phases 14, 15 and 16 of the asynchronous motor 13 can be checked for the presence of a machine fault.
  • a machine fault also exists if the parameters of the different winding branches or winding phases 14, 5 and 16 differ too much from one another, that is to say there is a so-called asymmetry.
  • a further temporal current profile 21 the phase vw deviates from the current profile 23 of the phase uw, the current profile 21 being brought about by the voltage pulse sequence 20 when the winding branch of the winding phases 15 and 16 is activated.
  • An alternative step for determining a machine fault is thus possible, in which a comparison of a time or electrical parameter of a first winding branch with a previously determined time or electrical parameter of a second winding branch is carried out by the comparison device of the microcontroller 5.
  • the temporal or electrical parameter of the first winding branch determines a tolerance value range with an upper and lower limit value, the limit values resulting from an amount-related deviation associated with the parameters of the first winding branch
  • the temporal or electrical parameters of the asynchronous motor 13 and also a possible error are determined according to the above steps before each intended actuation of the asynchronous motor 13 to generate a rotating field. This process is repeated continuously, so that in the event of only a temporary error, the error value can be reset if the time or electrical parameters of the asynchronous motor 13 lie within the respectively assigned tolerance value range.
  • Step prevents the output of a voltage pulse sequence or a sequence of a voltage pulse sequence of the power stage 12 to form a rotating field of the asynchronous motor 13, in which the shutdown device causes a reset of the digital outputs 9 if an error was determined in a previous step. Resetting the digital outputs 9 also causes the IGBT's T1 to T6 of the power stage 12 to be switched off and remain switched off as long as there is an error.
  • the voltage pulse sequence for generating a rotating field of the asynchronous motor with a device of the microcontroller 5 is dependent on a temporal and / or electrical parameter of the asynchronous motors 13 determined.
  • the control and regulating parameters selected in a previous step and dependent on the time and / or electrical parameters are used.
  • a mathematical motor or machine model can also be stored in the storage device 7. In such an embodiment, the control and regulation parameters and / or the voltage pulse sequence are calculated using devices of the microcontroller 5 with the mathematical motor model, using in particular the electrical parameters.
  • a predetermined permissible operating temperature value of the asynchronous motor is stored in the memory device 7.
  • an operating temperature value of the asynchronous motor 13 to be expected is calculated using a device of the microcontroller 5 using a further mathematical motor model and the voltage pulse sequence determined in the previous step.
  • the calculated operating temperature is compared with the predetermined operating temperature using a comparison device of the microcontroller 5. If the comparison device indicates that the predetermined operating temperature value is exceeded, then the steps of determining the voltage pulse sequence and comparing whether the predetermined operating temperature is exceeded are repeated until the expected operating temperature value is less than or equal to the predetermined operating temperature value.
  • Such an iterative determination of the voltage pulse sequence also takes into account the amount of overshoot in a next iteration step in the mathematical motor model for determining the voltage pulse sequence.
  • assignment tables with the same effect can also be stored in the memory device 7 in connection with fixed calculation rules.
  • the converter circuit 3 of the exemplary embodiment has a sequence control which controls the method steps described above. This sequence control is integrated in the microcontroller 5. Furthermore, this converter circuit 3 with the sequence control serves to control the above method steps and to control a dynamo-electric machine 13 or an asynchronous motor 13 which drives a drum which is rotatably mounted in the laundry treatment device.
  • the laundry treatment device is preferably a household washing machine or a household clothes dryer.
  • the converter circuit 3 is designed as a frequency converter circuit 3 which controls an asynchronous motor 13.
  • the method according to the invention is also suitable for alternative embodiments.
  • the converter circuit can also be designed as a so-called current converter or direct converter.
  • the method and the converter circuit 3 are also suitable for operating multiphase electronically commutated motors, synchronous motors, so-called switched reluctance motors or motors with permanent magnet excitation.
  • the converter circuit 3 has a microcontroller 5 with an integrated memory device 7.
  • the converter circuit 3 can also have a so-called digital signal processor 5 or a plurality of individual controllers or processors.
  • the devices of the microcontroller 5, for example the memory, comparison device or AD converter can be present in separate modules of the converter circuit that communicate with one another.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un circuit convertisseur (3), notamment d'un circuit convertisseur de fréquence modulées en largeur d'impulsion (3) qui est pourvu d'un circuit intermédiaire à courant continu et qui commande plusieurs branches d'enroulement d'une machine dynamo-électrique (13) polyphasée, notamment d'un moteur asynchrone (13) triphasé d'un appareil de traitement de linge. Ce procédé détermine au moins un paramètre de la machine dynamo-électrique (13) avant que le circuit convertisseur ne génère un champ magnétique rotatif dans la machine dynamo-électrique (13). Ces paramètres permettent de déduire une variante de la machine dynamo-électrique (13) et de choisir les paramètres de commande et de réglage associés à la variante. Le procédé permet également de déterminer d'éventuelles défauts de la machine à l'aide des paramètres. L'invention concerne enfin un circuit convertisseur (3) permettant de mettre en oeuvre le procédé ou un appareil de traitement de linge comportant un circuit convertisseur (3) permettant de commander une machine dynamo-électrique (13) polyphasée qui entraîne notamment un tambour monté rotatif dans l'appareil de traitement de linge.
EP03785867A 2003-12-18 2003-12-18 Procede de fonctionnement d'un circuit convertisseur d'un lave-linge ou d'un seche-linge Withdrawn EP1698032A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/014467 WO2005060064A1 (fr) 2003-12-18 2003-12-18 Procede de fonctionnement d'un circuit convertisseur d'un lave-linge ou d'un seche-linge

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EP1698032A1 true EP1698032A1 (fr) 2006-09-06

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US (1) US7372233B2 (fr)
EP (1) EP1698032A1 (fr)
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WO2005060064A1 (fr) 2005-06-30
US7372233B2 (en) 2008-05-13
AU2003294893A1 (en) 2005-07-05
US20050162120A1 (en) 2005-07-28

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