48 results about "Holding current" patented technology

The invention provides an electrostatic powder coating airflow stability real-time compensation method, and relates to the technical field of powder coating control, the method is realized based on an electrostatic powder coating airflow stability real-time compensation device, the device comprises a master control MCU, a pneumatic control valve, a stepping motor driver for driving the pneumatic control valve, and a current sampling circuit coupled to the stepping motor driver, the current collector is used for collecting winding current of the stepping motor in real time. The method comprises the following steps that after a pneumatic control valve is opened to a target opening degree and enters a holding state, a static holding current value of the pneumatic control valve is obtained; comparing the static holding current value with a preset reference holding current value, wherein the preset reference holding current value corresponds to the holding current required by the target opening degree under the smooth state of the airflow channel; according to the offset of the static holding current value relative to the reference holding current value, whether the airflow channel has a blocking trend or not is judged; if not, the current target opening degree of the pneumatic control valve is maintained, the airflow state change can be more directly sensed, and real-time active compensation is carried out.

The invention relates to a new energy grid-connected control technology, in particular to a grid-following type and grid-constructing type dual-mode switching control method and system for a voltage source converter, and the method comprises the steps: building an electrical topology and mathematical model of a grid-connected system, including modeling a main circuit under a synchronous dq coordinate system with a PCC voltage phase angle as a reference, obtaining active P and reactive Q expressions injected into the power grid; under the control of the following network type GFL, a PLL unit, a power outer ring and a current inner ring are adopted to realize synchronization and active / reactive injection control; under the control of the network construction type GFM, a power synchronous ring, an excitation ring, a voltage ring and a current ring are adopted to form network construction control; in the switching process, the current inner ring structure is kept consistent with the reference, when the GFM is switched to the GFL, the output of the power synchronous ring integrator serves as the initial value of the PLL unit integrator, and when the GFL is switched to the GFM, the output of the PLL unit integrator serves as the initial value of the power synchronous ring integrator.

The invention relates to the technical field of mechanical arm control, in particular to a mechanical arm speed control method based on load torque feedforward. The method comprises the following steps: acquiring an angular velocity and a three-phase current of a motor, and performing coordinate transformation to obtain a direct-axis current and a quadrature-axis current; generating a voltage control signal by using a current loop controller; generating a quadrature-axis current reference signal by using a speed ring controller; constructing a load torque observer based on the angular velocity and the quadrature-axis current to estimate the load torque in real time; an acceleration start flag and a deceleration start flag of the motor are detected, the estimated load torque is added to an input of the current loop controller as a feed-forward amount within a first predetermined time after the acceleration start flag is detected, and the feed-forward amount is removed from the input of the current loop controller within a second predetermined time after the deceleration start flag is detected. The constant parameters of the current loop and the speed loop controller are kept when the load and the rotational inertia change, and the stable suppression of the speed fluctuation is realized.

The application provides an electrostatic discharge protection device and a chip. The device comprises a substrate, a P-type region and an N-type region in the substrate, a first N-type doped region, a second N-type doped region, a first P-type doped region and a second P-type doped region in the P-type region, the second P-type doped region being between the first N-type doped region and the second N-type doped region, and the first N-type doped region being between the first P-type doped region and the second P-type doped region, a third N-type doped region and a third P-type doped region in the N-type region, and a gate above a region between the first N-type doped region and the second P-type doped region. The gate is connected with the second P-type doped region, the second N-type doped region is connected with the first P-type doped region as a negative electrode of the electrostatic discharge protection device, and the first N-type doped region, the third N-type doped region and the third P-type doped region are connected as a positive electrode of the electrostatic discharge protection device. The application can reduce the triggering voltage of the device and improve the holding current.

The utility model discloses a wide voltage module for an accessory of an alternating current contactor, which comprises the accessory provided with a circuit board. The alternating current and direct current module is used for converting the input alternating current voltage or direct current voltage into correspondingly output direct current voltage; and the input end of the coil driving module is electrically connected with the output end of the alternating current and direct current module. A voltage sampling module outputs a high-level voltage signal or a low-level voltage signal according to an input voltage value, a control module makes a voltage signal for driving an alternating current contactor to be closed or released according to the high-level signal and the low-level signal, and after closing, the control module adjusts the duty ratio, so that a coil driving module only outputs a holding current of 10 mA to 13 mA; according to the scheme, the input AC / DC voltage range is 24V-480V, the size and the cost of the voltage conversion device are reduced, the adaptability of the power supply is improved, and the energy consumption is effectively reduced.

Amplifier (10) with high gain and high tracking speed, comprising: a pair of input transistors (MNP 12, MNN 14) to which input voltages (IN+ and IN-) are applied; a pair of loads switched as diodes (MPP 16, MPN 18) connected to the input transistors (MNP 12, MNN 14); at least a pair of current sources (MPIP 20, MPIN 22) connected to the loads switched as diodes (MPP 16, MPN 18);and a bias control (28) designed to switch off the at least one pair of current sources (MPIP 20, MPIN 22) to enable a high tracking speed for the amplifier (10), wherein the bias control (28) switches off the current sources (MPIP 20, MPIN 22) during a coarse tracking mode of the amplifier (10) when the amplifier (10) is tracking, and to switch on the at least one pair of current sources (MPIP 20, MPIN 22) to enable a high gain for the amplifier (10), and wherein the bias control (28) switches on at least one pair of current sources (MPIP 20, MPIN 22) at the end of the tracking and leaves the current sources (MPIP 20, MPIN 22) switched on when the amplifier (10) is not tracking.

The invention provides a power supply control structure with hot plug and current sharing functions and a control method, the power supply control structure comprises a switching power supply unit, a hot plug power supply module, a central controller and a plurality of electrical parameter acquisition modules, the switching power supply unit comprises a main power supply module and one or more slave power supply modules; the main power supply module and the slave power supply module are used for feeding electric power to a load in an independent or parallel control manner through the corresponding hot plug power supply module, the working mode of the power supply module is adjusted according to the magnitude of the input voltage, and a plug signal of the corresponding hot plug power supply module is started according to the magnitude of the output voltage of the main power supply module. And setting the power supply module to work in a main-standby mode or a current sharing mode according to the output power. According to the invention, rapid response and stability maintenance can be realized when the output voltage changes, and the current stability can be maintained when the load suddenly changes or the input fluctuates, so that the dynamic performance and the protection capability are improved.

The invention relates to an LCC-MMC extra-high-voltage direct-current transmission line fault restarting method and an extra-high-voltage direct-current transmission system, and belongs to the technical field of extra-high-voltage direct-current transmission. When a line fault is detected, the LCC converter station controls the fault current to a direct current reference value; the MMC converter station controls the sub-module voltage to a rated value, the outer loop control output is switched to the sub-module voltage controller output, the direct current bias part of the direct current voltage reference value is switched to the direct current controller output, and the direct current reference value is the direct current reference value; after the deionization time is over, the DC bias part of the MMC converter station rises to a reference value, and the constant current control is quitted at the same time; when the current converter port voltage is detected to be greater than the starting value, the sub-module voltage control is quitted, and the outer loop control output is switched to the direct current voltage controller output; and the LCC converter keeps a current control mode, and when the DC voltage is detected to be greater than a completion value, the LCC converter station switches the current reference value to a real-time current reference value, and the line fault restart is completed.

A load control device for controlling the amount of power delivered from an AC power source to an electrical load is operable to conduct enough current through a thyristor of a connected dimmer switch to exceed rated latching and holding currents of the thyristor. The load control device comprises a controllable-load circuit operable to conduct a controllable-load current through the thyristor of the dimmer switch. The load control device disables the controllable-load circuit when the phase-control voltage received from the dimmer switch is a reverse phase-control waveform. When the phase-control voltage received from the dimmer switch is a forward phase-control waveform, the load control device is operable to decrease the magnitude of the controllable-load current so as to conduct only enough current as is required in order to exceed rated latching and holding currents of the thyristor.

The invention discloses a power regulation and control method and device of an energy storage battery and electronic equipment, and relates to the field of battery management. The method comprises the following steps: monitoring a first state parameter of a battery in real time, and constructing a multi-dimensional state space reflecting electrochemical activity attenuation and thermal runaway risk of the battery according to the first state parameter; wherein the state parameters comprise a thermal diffusion gradient, a polarization voltage abrupt change rate and a gas release rate; dynamically judging whether a power reduction mode is triggered or not according to the multi-dimensional state space; and when the power reduction mode is triggered, carrying out stepped power reduction operation on the battery until the output / input current of the battery is reduced to the load holding current. The technical problem that in the prior art, a single index is adopted for power management and control in battery management, charging and discharging may be stopped too early, and consequently part of actually available capacity cannot be utilized or battery life management is not facilitated is solved.

The invention relates to the technical field of railway shunting control technology, and provides a turnout switching state sensing and interlocking control system for flat shunting, a data acquisition module of the turnout switching state sensing and interlocking control system is used for acquiring switch rail displacement voltage signals and switch machine motor current intensity, and calculating a switch rail displacement rate value through a displacement difference value and a time interval at adjacent moments; the conversion pre-judgment module judges a descending trend according to the switch rail displacement rate value and generates a low-frequency holding current instruction and a driving pulse cut-off instruction value; the mechanical verification module collects the displacement reading of the locking rod and the angle of the switch rail to obtain the integrity value of the mechanical structure; the interlocking logic module calls the driving pulse truncation instruction value and the structural integrity value to generate an interlocking state judgment value; and the signal control module outputs a high level to a shunting signal machine lighting circuit according to the interlocking state judgment value to generate a signal open level value. The problems that a mechanical locking structure mostly depends on manual or single-point verification, and linkage of interlocking logic and signal control is weak are solved.

The application provides a static powder coating airflow stability real-time compensation method, relates to the powder coating control technical field, and is realized based on a static powder coating airflow stability real-time compensation device. The device comprises a main control MCU, a gas control valve, a stepping motor driver for driving the gas control valve, a current sampling circuit coupled to the stepping motor driver and used for collecting the winding current of the stepping motor in real time. The method comprises the following steps: after the gas control valve is opened to the target opening degree and enters the holding state, the static holding current value is obtained; the static holding current value is compared with the preset reference holding current value, the preset reference holding current value corresponds to the holding current required by the target opening degree under the unobstructed state of the airflow channel; whether the airflow channel has the blocking trend is judged according to the offset of the static holding current value relative to the reference holding current value; if not, the current target opening degree of the gas control valve is maintained, the airflow state change can be directly sensed, and real-time active compensation can be performed.

The application provides a broken pile detection method and device, electronic equipment and a storage medium, and belongs to the technical field of engineering nondestructive testing. The method comprises the following steps: synchronously acquiring three types of data of holding current, grouting pressure and drill rod vibration at a first acquisition frequency, and calculating the holding current drop amplitude, the grouting pressure drop amplitude and the drill rod vibration frequency growth based on the three types of data. If the above indexes meet the over-limit early warning condition, the current drill rod drilling depth is acquired, and the second acquisition frequency is switched to to supplement the same type of data. The target parameter early warning threshold set is determined based on the soil property data corresponding to the current drilling depth. The three types of data acquired before and after the acquisition and the target parameter early warning threshold set are fused, and the broken pile risk probability is calculated. When the broken pile risk probability reaches the preset broken pile alarm probability threshold, the broken pile alarm information is generated. The application can realize timely identification and accurate early warning of the broken pile risk.

The invention provides a current-controllable electromagnetic valve drive circuit for EHA and a control method thereof, the current-controllable electromagnetic valve drive circuit comprises an APSOC, a PWM signal conversion module, a drive switch module, a current sampling module, an electromagnetic valve interface module and an inverse peak elimination protection module, high starting current and low work holding current distribution control of an EHA electromagnetic valve is realized, long-time work heating of the electromagnetic valve is reduced, and the service life of the electromagnetic valve is prolonged. The working reliability is improved.

The present invention relates to a method for controlling a fuel injector (1) of an internal combustion engine with a magnetic actuator (10) for actuating an outwardly opening valve element (4, 6), wherein the magnetic actuator (10) has a magnetic coil (3) and a magnetic armature (2) which is operatively connected to the valve element (4, 6), and the magnetic coil (3) is configured to be supplied with a current in order to open the valve element (4, 6), the method comprising determining a target control end and a target control duration of the magnetic actuator (10) based on a target control start of the magnetic actuator (10) and a target fuel quantity; determining a cylinder pressure expected to act on the valve element (4, 6) at the target control end of the magnetic actuator (10);Determining the expected stroke profile of the valve element (4, 6) during a holding current phase of the solenoid coil (3) as a function of the determined cylinder pressure expected to act on the valve element (4, 6) at the target actuation end. If the expected stroke profile exhibits a maximum stroke of the valve element (4, 6) during the entire holding current phase of the solenoid coil (3), the solenoid actuator (10) is actuated with the determined target actuation duration and the determined target actuation start time. If one or more values ​​of the expected stroke profile during the holding current phase of the solenoid coil (3) are less than the maximum stroke of the valve element (4, 6), the determined target actuation duration and / or the determined target actuation start time are adjusted, and the solenoid actuator (10) is actuated with the adjusted target actuation duration or the adjusted target actuation start time.

This application provides a method, apparatus, and medium for determining the holding current of a phase-change memory array. The method includes: obtaining the range of set currents for performing a set operation on the phase-change memory array; obtaining the threshold voltage distribution when multiple set currents within the set current range are applied to the phase-change memory array; obtaining the target voltage under each set current based on the standard deviation of a preset multiple of the threshold voltage distribution corresponding to each set current; calculating the voltage difference between the target voltages corresponding to two adjacent set currents within the set current range in the direction of sequential increase of the set current, obtaining multiple voltage differences; and determining the set current corresponding to the voltage difference that satisfies the voltage change condition among the multiple voltage differences as the holding current of the phase-change memory array, thereby achieving simple, fast, accurate, and efficient determination of the holding current of the phase-change memory array.

The utility model relates to a fire extinguishing system and device with low power consumption of a bus, which utilize the unilateral conductivity of a diode, the diode is not conducted without forward voltage difference during standby, and current can pass through normally after voltage difference conduction is generated during short circuit of the bus, so as to control the closing and opening of an isolation relay and carry out isolation protection on an extension module circuit. Circuit devices are few and can be easily added to an extension module circuit, additional isolation modules are not needed, each module can independently achieve isolation protection, on-site construction is more convenient, and the total cost is lower. Aiming at the characteristics of large action current and small holding current of the relay, the capacitor is used for storing energy to maintain standby high voltage so as to instantly provide large current for the relay to maintain the switch of the relay in an off state, the large resistor is used for providing small current to maintain the switch to be off, and the large resistor can also prevent the energy storage capacitor from attenuating alternating current signals on a bus. The power supply current at the moment of relay action is large, the power consumption current during maintenance is small, and the influence on bus alternating current signals is small.

The application discloses a phase change memory and a control method thereof, and belongs to the technical field of memories. The phase change memory comprises a plurality of local word lines and a plurality of local bit lines; a storage unit array comprising a plurality of array-arranged storage units, each storage unit being coupled between a local word line and a local bit line; a plurality of storage units comprising a target storage unit; a first current mirror structure coupled to the target storage unit through a local bit line; and a second current mirror structure coupled to the target storage unit through a local bit line. The first current mirror structure is configured to apply a first current signal to the target storage unit in a first time period; the first current signal is greater than a holding current of the target storage unit. The second current mirror structure is configured to apply a second current signal to the target storage unit in a second time period; the second current signal is greater than the first current signal. The above scheme can reduce the inrush current during the RESET operation.

The invention relates to the technical field of LED illumination driving, in particular to a novel phase-cut dimming power supply. Comprising an AC input filtering and DC conversion circuit, an active power factor correction circuit, a flyback high-low voltage isolation conversion circuit, a synchronous rectification circuit, a voltage stabilizing circuit, a dimming circuit, a single-chip microcomputer control small board, a PWM signal-to-analog signal circuit, a phase cutting control circuit and an external load. According to the invention, the conduction angle and front and back edge information can be accurately analyzed, the detection precision is obviously improved, the stroboflash during deep dimming is eliminated, the dimming range is widened without flicker, dynamic holding current control data is generated, the light modulator can adapt to holding current requirements of different light modulators, the stable work of the light modulator is ensured, and the power consumption is reduced; besides, a novel PWM signal-to-analog signal circuit is adopted, so that the linearity and the anti-interference capability of signal conversion are greatly improved, stable output is ensured, and a high-compatibility and high-precision phase-cut dimming effect is realized.

The utility model discloses an output overvoltage locking circuit of a switching power supply, which relates to the technical field of electronic circuits and comprises an output voltage detection circuit module, a thyristor control circuit module, an output overvoltage protection circuit module and a thyristor holding current circuit module. During use, output voltage is detected, and when the output voltage exceeds a threshold value of the three voltage stabilizing diodes connected in series, the optocoupler is switched on; when the optocoupler is conducted, current starts from VCC and flows through the resistor and the optocoupler element respectively, so that the current is injected to a trigger pin of the thyristor, and the thyristor is saturated and conducted; at the moment, VCC is pulled down by discharging of a resistor and a thyristor loop, so that overvoltage protection is achieved.

The invention discloses a fuel cell stack activity recovery or activation method and a control system, and the method comprises the following steps: enabling a fuel cell stack to stably operate under a set current density, and keeping the pressure and flow of a hydrogen path and the pressure and flow of a water path constant in the operation process; reducing the stoichiometric ratio of an air path to a preset range, so that the fuel cell stack enters a slight air shortage state and fluctuates along with the voltage of the fuel cell stack; and adjusting the pressure of the air path in a reciprocating manner, so that air shortage and air supply are alternately realized in the fuel cell stack, and a hydrogen pumping effect is formed through the alternate action of the air shortage and the air supply, so that the activity recovery or rapid activation of the fuel cell stack is completed. When the scheme is operated, the current can be kept stable, the repeated pressure change operation is simple, the consumed time is short, the hydrogen pumping effect is obvious, the performance of the fuel cell stack can be recovered in a short time, the method can be used for quickly activating a new fuel cell stack, and the activation time is shortened.

The application provides a bidirectional Super buck-boost double bus power conversion circuit based on phase shift control, one end of a current collection circuit Rsense1 is connected with a high-voltage bus, the other end is connected with one end of an inductor L4, the other end of the inductor L4 is connected with the drain of a switch MOS tube Q1; one end of a current collection circuit Rsense2 is connected with a low-voltage bus, the other end is connected with the source of the switch MOS tube Q1 and the drain of a switch MOS tube Q2. The application has the advantages that energy can be bidirectionally supplied between different voltage buses of a space power supply, energy redundant resources are effectively utilized; the energy sharing of the high-voltage bus and the low-voltage bus in a "mobile phone direct connection satellite energy system" can be effectively solved, the redundant cost of the conversion circuit is reduced; meanwhile, the excess energy can be autonomously transmitted from one bus to another bus with insufficient energy; the current is continuous during the energy transmission process, which can effectively reduce the disturbance to the bus; and multiple buses can be connected in parallel for expansion.

The invention relates to a double-peak maintaining driving waveform control method for an electromagnetic ammonia-hydrogen gas fuel injector, which comprises the following steps of: (a) applying a high voltage to an injector coil, so that the coil current rapidly rises to a first peak current value Ip1 within an extremely short time, and maintaining for a short time Tp1; (b) adjusting and reducing the coil current to a second peak current value Ip2 and maintaining the second peak current value Ip2 for a period of time Tp2; and (c) reducing the current of the coil to a holding current value Ih, and maintaining the current in the whole residual injection pulse width time Th. And the movement of the armature is actively decelerated in the second peak stage, so that the armature can stably and controllably reach the full-open position, the mechanical impact is greatly reduced, the high consistency of the lift of the valve core and the full-open position in each injection is ensured, and the metering accuracy of the gas fuel is improved.

The invention discloses a WSO-SVD-based FlexTSF-PG-BO current diagnosis method and system, and the method comprises the steps: carrying out the signal noise reduction and feature extraction of current signal data through a weighted singular decomposition algorithm, and obtaining the denoised current signal data; an IVP Patcher continuous time module is introduced for construction, a Bayesian optimization algorithm based on physical guidance is combined for optimization, and a FlexTSF-based time sequence feature model is constructed; and based on a FlexTSF time sequence characteristic model, the denoised current signal data is diagnosed and identified, a prediction result of the current signal is obtained, and the prediction result of the current signal comprises a normal current, an electric shock current and an insulation defect current. According to the invention, the diagnosis precision of the current signal data can be maintained under different load and noise working conditions. The FlexTSF-PG-BO current diagnosis method and system based on WSO-SVD can be widely applied to the technical field of current diagnosis.

The invention relates to a valve control unit (3) for actuating a solenoid valve (2), comprising a control circuit (38) having an input interface (30) for receiving a switching signal and an output interface (31) for coupling the solenoid valve (2), the control circuit is designed to process the switching signal and to provide a coil current dependent on the switching signal to the output interface (31). Wherein the control circuit (38) is designed to adjust the coil current to a suction current intensity during a first time period and to adjust the coil current to a holding current intensity, which is less than 70% of the suction current intensity, during an immediately following second time period, wherein the control circuit is designed to increase the holding current intensity in a time-limited manner by at least 20%, preferably at least 30%, in particular at least 40%, when a predetermined coil current threshold value is exceeded during the second time period.

The application provides a clamping protection circuit and equipment, the clamping protection circuit comprises a first resistance, a current conversion module, a current mirror structure, a first capacitor and a first NMOS transistor; the circuit keeps the current values of two current outputs of the current conversion module same through the current mirror structure, and one current output of the current conversion module is connected with the first capacitor, so that when the two current outputs of the current conversion module are not same in practice, the first capacitor consumes / supplements the current of the difference part, that is, the charging / discharging of the first capacitor is realized, and then the control of the first NMOS transistor is realized, and the voltage clamping is realized. The circuit does not depend on the threshold voltage of the transistor in the voltage clamping process, which greatly increases the accuracy of the clamping voltage and improves the practical application effect of the clamping protection circuit.

The invention discloses a contactor control system which comprises a driving circuit, a control circuit and a current detection circuit. The driving circuit comprises a follow current diode, the cathode of which is electrically connected to the anode of a power supply and one end of a contactor coil, and the anode of which is electrically connected to the other end of the contactor coil; and the drain electrode of the N-type MOS tube is connected with the positive electrode of the follow current diode, and the source electrode of the N-type MOS tube is electrically connected to the negative electrode of the power supply. The control circuit is connected with the grid electrode of the N-type MOS tube and is used for outputting PWM waves to the grid electrode of the N-type MOS tube. The current detection circuit is connected with the drive circuit and used for detecting the holding current of the contactor coil in the holding stage in real time. The current detection circuit is connected with the control circuit and used for feeding back the detected holding current to the control circuit, and the control circuit adjusts the duty ratio of the PWM waves output by the control circuit in real time according to the difference value between the detected holding current and the preset holding current so that the holding current can be equal to the preset holding current.

We provide a contactor control system. [Solution] The control circuit 2 is connected to the gate of the N-type MOS transistor Q1 in order to output a PWM wave to the gate of the N-type MOS transistor Q1. The current detection circuit 3 is connected to the drive circuit 1 in order to detect the holding current of the contactor coil in real time during the holding phase. The current detection circuit 3 is connected to the control circuit 2 in order to feed back the detected holding current to the control circuit 2, and the control circuit 2 adjusts the duty cycle of the PWM wave output by the control circuit 2 in real time based on the difference between the detected holding current and the predetermined holding current so that the holding current becomes equal to the predetermined holding current.

The invention provides an electrostatic discharge protection device and a chip. The device comprises a substrate; the P-type region and the N-type region are located in the substrate; the first N-type doped region, the second N-type doped region, the first P-type doped region and the second P-type doped region are located in the P-type region, the second P-type doped region is located between the first N-type doped region and the second N-type doped region, and the first N-type doped region is located between the first P-type doped region and the second P-type doped region; the third N-type doped region and the third P-type doped region are located in the N-type region; the grid electrode is positioned above a region between the first N-type doped region and the second P-type doped region; wherein the grid electrode is connected with the second P-type doped region, the second N-type doped region is connected with the first P-type doped region to serve as a negative electrode of the electrostatic discharge protection device, and the first N-type doped region, the third N-type doped region and the third P-type doped region are connected to serve as a positive electrode of the electrostatic discharge protection device. The trigger voltage of the device can be reduced, and the holding current is improved.

A method for controlling an electric actuator (3) of an aircraft, wherein the actuator (3) has a motor and is operated in a holding mode, wherein the actuator (3) is controlled such that the actuator (3) is controlled to a position and / or load value, wherein the actuator (3) is further controlled such that the position and / or load value is changed within a defined range and / or at least one further parameter of the actuator (3) is controlled and / or changed, characterized in that the further parameter is a current (IHOLD) and / or a movement (n) of the motor and / or the actuator (3), wherein the current (IHOLD) and / or the movement (n) of the motor and / or the actuator (3) are maintained within a defined range and that the holding current (IHOLD) of the motor and / or the actuator (3) necessary for the holding mode is controlled such thatthat a torque calculated from the holding current (IHOLD) corresponds to a breakaway torque (TBO) of the motor and / or the actuator (3).