Abstract: A power tool may include an end effector configured to enable a fastener to be applied by the power tool via a fastening cycle, a power unit, a drive assembly configured to apply drive power to the end effector responsive to application of input power thereto, and a motor configured to supply the input power to the drive assembly selectively based on operation of a power control assembly that controls coupling of the motor to the power unit. The drive assembly includes a clutch configured to interrupt application of the drive power at a target torque. The power control assembly may be configured to adaptively change speed of the motor in response to the power tool reaching a predefined torque value that is less than the target torque during the fastening cycle.

Abstract: A method for controlling transient operation of a variable flux machine (VFM) includes, during a shunt angle transition, receiving a commanded and measured shunt angle when operating in a predetermined operating region, e.g., maximum torque per ampere or field weakening. The method includes calculating d-axis and q-axis delta current terms (?Id and ?Iq) required to maintain an output torque level of the VFM through a duration of the shunt angle transition, then applying the required ?Id and ?Id terms as feed-forward terms to adjust a d-axis current (Id) term and a q-axis current (Iq) term from a respective lookup table. In this manner the controller maintains the output torque level of the VFM during the shunt angle transition. An electric powertrain includes the VFM, a TPIM, and the controller. A PM machine may be controlled by substituting temperature for shunt angle.

Abstract: Technical solutions are described for diagnosing an input power supply providing power to a motor. A method includes: generating a sinusoidal stimulus signal; applying, using the input power supply, the sinusoidal stimulus signal to the motor; measuring a response to the sinusoidal stimulus signal; determining a degraded condition of the input power supply based on the response to the sinusoidal stimulus signal; and performing an action in response to determining the degraded condition of the input power supply.

Abstract: An air conditioner includes a compressor to compress a refrigerant used in a refrigeration cycle, a converter to generate a DC voltage, an inverter to generate three-phase AC voltages from the DC voltage, a motor to produce a driving force for driving the compressor with a plurality of coils, the three-phase AC voltages being applied to the coils, a connection switching unit to switch connection states of the coils between a first connection state and a second connection state, and a controller to detect an abnormality of the connection switching unit.

Abstract: An image forming apparatus which includes a motor, a first power supply unit that supplies a first voltage to the motor, and a second power supply unit that supplies a second voltage, which is higher than the first voltage, to the motor, and a central processing unit (CPU) that controls supply of the second voltage from the second power supply unit to the motor while maintaining supply of the first voltage from the first power supply unit to the motor.

Abstract: In one embodiment, an apparatus includes a different amplifier. A node in the apparatus receives a motor-current signal and an output of the differential amplifier. The motor-current signal represents a motor current of a DC brush motor. Moreover, a first input of the differential amplifier is coupled to a node. The apparatus also includes a low-pass filter with an input receiving a motor-current signal and an output coupled to a second input of the differential amplifier. The apparatus additionally includes a comparator with a first input coupled to the output of the differential amplifier and a second input coupled to a referential voltage.

Abstract: A motor vehicle on-board power system with a power converter, windings, an electric machine and a delta switch group is described. The electric machine is connected to the power converter, wherein a DC external connection is provided. The delta switch group connects the windings in a delta configuration. At least one switch of the delta switch group also connects at least one alternating current connection of the power converter to the DC external connection. A configuration controller actuates the delta switch group and has, on the one hand, the function of actuating the delta switch group in the closed state or open state within a driving state, according to a configuration specification. When energy is transmitted via the DC external connection, at least one switch of the delta switch group is actuated by the configuration controller according to a closed switching state. In addition, an associated method is described.

Abstract: The present subject matter relates to a battery module for use in a vehicle. The battery module may include a housing, a plurality of battery cells disposed within the housing, and solid state pre-charge control circuitry that pre-charges a direct current (DC) bus that may be coupled between the battery module and an electronic component of the vehicle. Furthermore, the solid state pre-charge control circuitry may include solid state electronic components as well as passive electronic components.

Abstract: Provided is a motor control device which can accurately perform velocity control over a sliding door. The motor control device has a control unit which determines a command value for a duty ratio such that a moving velocity of the sliding door of a vehicle follows a target velocity set in advance while the sliding door is being opened and closed. The motor control device includes a plurality of upper stage switching elements that are connected between terminals of windings of the electric motor and the power source, and a plurality of lower stage switching elements that are connected between the terminals and a ground potential. The control unit causes all the upper stage switching elements or all the lower stage switching elements to be in a turned-on state in accordance with the command value.

Abstract: An ad hoc communication network includes at least one vehicle-side radio device connected to a vehicle, a plurality of track-side radio devices installed on a track of the vehicle, and a monitoring and control unit, which is connected to at least one track-side radio device for communication. The track-side radio devices communicate, without logical connection with other track-side radio devices located within the radio range and with the vehicle-side radio device and forward received data to other track-side radio devices located within the radio range. At least two other track-side radio devices are located in each direction along the track within the radio range of each track-side radio device. The track-side radio devices transfer received data to the closest and to the second closest track-side radio device in at least one direction along the track.

Abstract: An information handling system (IHS) includes spatially diverse IHS components and temperature sensors disposed with respect to the spatially diverse IHS components. A fan controller defines cooling sections of the IHS for spatially diverse fans based on topological information as to locations of the spatially diverse IHS components, and selectively controls the spatially diverse fans according to component temperatures obtained from the temperature sensors and according to the cooling sections.

Abstract: The quietness requirement level of a charging point is determined based on the position information on the charging point where an in-vehicle battery is fast charged by an external power supply. For an air conditioner that cools the in-vehicle battery through a drive power of an electric compressor when the in-vehicle battery is charged, an upper limit of a rotation speed of the electric compressor is set in such a way that the upper limit of the rotation speed of the electric compressor is set lower when the in-vehicle battery is charged by the external power supply at a charging point where the quietness requirement level is equal to or higher than a predetermined value than when the in-vehicle battery is charged by the external power supply at a charging point where the quietness requirement level is lower than the predetermined value.

Abstract: A system for controlling electrical power generated by a permanent magnet machine coupled to an internal combustion engine includes a central processing unit configured to determine speed of the machine, and compare the machine speed with a predetermined range of machine speeds, a series power switching circuit connected between the machine and a battery, a bus decoupling power switch connected between a voltage bus and the battery, and a bridge switching circuit connected between the voltage bus and the machine and configured to amplify voltage generated by the machine if the machine speed is less than a predetermined value or fall within a predetermined range thereby charging the battery with amplified voltage even at lower machine speeds. The central processing unit selectively connects the bridge switching circuit with the battery by actuating the bus decoupling switch and/or the series power switching circuit depending upon the machine speed.

Abstract: Embodiments of the invention provide a system for adapting a pool pump for wireless communication. In some embodiments, a system for adapting a pool pump with a serial communication port for communication with a user via a remote server, an internet connection, and internet enabled device is provided, the system comprising: a wireless gateway device connected to a router; and a wireless adapter connected to the serial communication port, comprising: a gateway node; a transceiver; and a processor programmed to: establish a wireless connection with the wireless gateway; receive a first message from the pool pump; cause the gateway node to modify the first message; cause the first modified message to be transmitted to the remote server via the wireless gateway; receive a second message from the remote server; modify the second message for output to the pool pump; and transmit the second modified message to the pool pump.

Abstract: The present disclosure provides a method for automatically optimizing power consumption. The method includes: (S1) a baseboard management controller determines whether system information is correct or not after powered on. If correct, further proceeding the method. If not correct, stopping further proceeding the method. (S2) the baseboard management controller periodically detects the surface temperature and the internal temperature of the essential element with a first loop cycle and determines whether the surface temperature or the internal temperature is higher than a preset temperature. (S3) If the surface temperature or the internal temperature is higher than the preset temperature, performing a PID adjustment to the fan rotation speed according to the surface temperature or the internal temperature of the essential element.

Abstract: A motor driving control device drives each of a first motor and a second motor based on a predetermined condition designation signal, and includes a control unit, a first motor driving unit and a second motor driving unit. The control unit outputs first and second PWM signals to control driving of the first and second motors, respectively. Each of the first and second motor driving units flow a current through the first and second motors based on the first and second PWM signals, respectively. The control unit includes a determination means configured to determine whether the condition designation signal meets a predetermined mode switching condition, and an adjustment means configured to perform overlapping-related adjustment of an on period of the first PWM signal and an on period of the second PWM signal, based on a determination result of the determination means.

Abstract: An AC-AC power convertor converts a first AC voltage to a second AC voltage. A PFC rectifier circuit rectifies an AC voltage (vG) so as to generate a rectified voltage. An inverter generates the second AC voltage from the rectified voltage. A controller controls the PFC rectifier circuit and the inverter such that power generated by the first AC voltage and the pulsations of power generated by the rectified voltage are output to an external device.

Abstract: A system and method for implementing a neural network based vehicle dynamics model are disclosed. A particular embodiment includes: training a machine learning system with a training dataset corresponding to a desired autonomous vehicle simulation environment; receiving vehicle control command data and vehicle status data, the vehicle control command data not including vehicle component types or characteristics of a specific vehicle; by use of the trained machine learning system, the vehicle control command data, and vehicle status data, generating simulated vehicle dynamics data including predicted vehicle acceleration data; providing the simulated vehicle dynamics data to an autonomous vehicle simulation system implementing the autonomous vehicle simulation environment; and using data produced by the autonomous vehicle simulation system to modify the vehicle status data for a subsequent iteration.

Abstract: An actuator of a camera module includes a position detector configured to generate a feedback signal based on a detected position of a lens barrel; and a driver configured to drive the lens barrel based on a difference between an input signal indicating a target position of the lens barrel and the feedback signal, wherein the driver includes a signal adjuster configured to calculate an offset between the target position of the lens barrel and an actual position of the lens barrel, and apply the input signal to a calibration function based on the offset to generate a calibrated input signal.

Abstract: A system and method for implementing a neural network based vehicle dynamics model are disclosed. A particular embodiment includes: training a machine learning system with a training dataset corresponding to a desired autonomous vehicle simulation environment; receiving vehicle control command data and vehicle status data, the vehicle control command data not including vehicle component types or characteristics of a specific vehicle; by use of the trained machine learning system, the vehicle control command data, and vehicle status data, generating simulated vehicle dynamics data including predicted vehicle acceleration data; providing the simulated vehicle dynamics data to an autonomous vehicle simulation system implementing the autonomous vehicle simulation environment; and using data produced by the autonomous vehicle simulation system to modify the vehicle status data for a subsequent iteration.

Abstract: A shift range control device switches a shift range by controlling driving of a motor in a shift range switching system, in which a play exists between a motor shaft which is a rotation shaft of a motor and an output shaft to which the rotation of the motor is transmitted. A parameter calculation unit calculates a motor angle, a motor speed and a motor acceleration based on a motor rotation angle signal acquired from a motor rotation angle sensor which detects a rotation position of the motor. An idling check unit checks an end of idle rotation, in which the motor rotates within a range of the play, based on the motor speed and the motor acceleration. A target setting unit sets a motor angle target value related to drive control on the motor, by using an angle correction value which is a value corresponding to the motor angle at the end of the idle rotation. A drive control unit controls the driving of the motor such that the motor angle becomes the motor angle target value.

Abstract: Disclosed herein is a controller of a hoist. The controller of a hoist includes a lift up button which is adjustable in a pressed degree; a lift down button which is adjustable in a pressed degree; lift up button contacts configured to allow ascending direction control power to flow to a motor when the lift up button is pressed; lift down button contacts configured to be in contact when the lift down button is pressed and allow descending direction control power to flow to the motor; a magnet accommodated in each of the lift up button and the lift down button; and a Hall sensor disposed to detect a descending degree of the magnet accommodated in each of the lift up button and the lift down button.

Abstract: A method for use in an information handling system comprising a processor, an information handling resource communicatively coupled to the processor, the information handling resource including a controller and a temperature sensor for sensing a temperature associated with the information handling resource, and a management controller communicatively coupled to the processor and the information handling resource, and having stored thereon a program of instructions configured to perform thermal management of the information handling system, may be provided. The method may include periodically communicating information indicative of the temperature from the information handling resource to the management controller, storing by the management controller the information indicative of the temperature in a data record associated with the temperature sensor, and based on information stored in the data record, performing by the program of instructions closed-loop thermal management of the information handling system.

Abstract: The present disclosure relates to a storage device and a method of controlling a rotation speed of a fan of the storage device. The storage device comprises: a housing comprising an opening; a fan arranged at an end of the housing opposed to the opening; a tray comprising a plurality of partitions arranged in rows and being operable to be drawn out of or inserted into the housing via the opening in a longitudinal direction of the housing; a plurality of tray position detectors respectively arranged on the plurality of partitions and configured to detect a relative position of the tray with respect to the housing; and a controller adapted to adjust a rotation speed of the fan according to the relative position detected by the tray position detector.

Abstract: A power tool is provided including a brushless DC (BLDC) motor, a rectifier that receives an alternative current from a power supply and outputs a rectified signal supplied to a DC power bus, and an inverter circuit having motor switches connected electrically between the DC power bus and the motor. A control module controls a switching operation of the power switches to regulate supply power from the power supply to the motor. The control module controls the switching operation so as to, within a half cycle of the AC power supply voltage waveform, increase current draw from the power supply from a first threshold at or after a first zero-crossing of the half cycle up to a second threshold, and reduce current draw from the power supply from the second threshold up to a third threshold at or prior to a second zero-crossing of the half cycle.

Abstract: A stable-quality rotary electric machine system in which one or more rotary electric machine characteristics are normalized from various viewpoints. The rotary electric machine system is provided with: a rotary electric machine having a rotor, a stator, and a stator coil; and a controller configured to execute drive control of the rotary electric machine. The controller applies, to a drive control signal for the rotary electric machine, normalization information, which normalizes the drive control signal for the rotary electric machine, derived by comparing specific information about a value correlated to an induced voltage occurring in the stator coil when the rotor of the rotary electric machine is driven under prescribed conditions and predetermined reference information about the value correlated to the induced voltage occurring in the stator coil. Then, the drive control signal normalized by the application is used to execute the drive control of the rotary electric machine.

Abstract: A motor controller includes a motor drive circuit, a noise cancellation circuit, and a control unit. The motor drive circuit supplies electric power to an electric motor. The noise cancellation circuit includes an RLC circuit, a switch element, and a pull-down resistor. One end of the RLC circuit is electrically connected to a positive terminal of a power supply via the switch element, and the other end of the RLC circuit is electrically connected to a frame ground. A connection point between the RLC circuit and the switch element is electrically connected to a negative terminal of the power supply via the pull-down resistor. The control unit turns ON the switch element for a predetermined time at falling timings of phase voltages output from the motor drive circuit.

Abstract: Provided is an image forming apparatus including: an image forming unit configured to form an image on a recording material; an exhaust fan configured to exhaust air inside the image forming apparatus; a CPU configured to control rotation of the exhaust fan; and a memory configured to store in advance a first control setting value for rotating the exhaust fan at a first target rotation speed. The CPU rotates the exhaust fan based on the first control setting value, and permits the image forming unit to form an image when a rotation speed of the exhaust fan becomes equal to or faster than a lower limit rotation speed for suppressing a discharge amount of UFPs. When a predetermined time period has elapsed, the CPU performs feedback control for the exhaust fan such that the exhaust fan is rotated faster than the first target rotation speed.

Abstract: A power door actuation system including a swing door actuator assembly having a rotatable drive nut assembly operable to move the door between a closed position and at least one open position to provide a power opening and closing function.

Abstract: The invention provides a fan control system, which comprises a fan, a control unit, and a fan chip. The fan chip comprises a command table. A first specific pulse pattern represented as a first form of code, and a second specific pulse pattern represented as a second form of code are defined in the fan chip. The command table records at least one control command. Each control command is corresponding to a code string, respectively. When the fan chip receives a series of pulse signals from the control unit, it will determine that the code string is represented by the pulse signals, and inquire the corresponding control command from the command table according to the determinated code string so as to set up at least one operation parameter of the fan chip or control the fan to perform a corresponding operation according to the inquired control command.

Abstract: One embodiment includes display device configured to wirelessly receive a first position status from a positioning device; display a first work-tool working-axis leveling status based on the first position status; receive cut parameters; receive a cut-start indication; determine a first work-tool position status difference based on cut parameters and a second position status; present a position status correction indicator; determine that a third position status is within cut parameters; send a cut-start signal to the positioning device operable to actuate the first work-tool; determine a work-tool cut completion; and send a cut-end signal to the positioning device operable to de-actuate the first work-tool.

Abstract: Adjusting a cooling fan speed control profile to account for system implementation factors, such as ambient temperature and usage history, can optimize power consumption and reduce the volume and variation of sound generated by shifts in fan speed in response to changes in system and component temperature. Adjusting a cooling fan speed control profile may include adjusting a maximum fan speed based on an ambient temperature or component temperature of the information handling system.

Abstract: The invention provides a detection system and method of signal transmission delay for fan chip. The detection system comprises a circuit board, a fan chip and a control unit. The control unit generates a first pulse signal having a specific pulse pattern, and send the first pulse signal to the fan chip. When the fan chip is operating in a detection mode of signal transmission delay according to the first pulse signal, the fan chip copies the specific pulse pattern of the first pulse signal to generate a second pulse signal having the specific pulse pattern, and send the second pulse signal to the control unit. The control unit calculates a time difference between a time that sends the first pulse signal and a time that receives the second pulse signal, so as to obtain a delay time of signal transmission between the control unit and the fan chip.

Abstract: After a temperature point of the cooling fan is set according to a plurality of temperatures corresponding to a plurality of first consecutive time intervals, control a duty cycle of the cooling fan according to the temperature point, acquire temperature variation data of the cooling fan during a plurality of second consecutive time intervals, generate a gain factor and a frequency factor of the cooling fan according to the temperature variation data, and generate a proportional gain factor, an integral time factor and a derivative time factor of a proportional-integral-derivative controller of the cooling fan according to the gain factor and the frequency factor of the cooling fan. The plurality of first consecutive time intervals are followed by the plurality of second consecutive time intervals.

Abstract: A rack for supporting sleds includes a pair of elongated support posts and pairs of elongated support arms that extend from the elongated support posts. Each pair of the elongated support arms defines a sled slot to receive a corresponding sled. A power supply is attached to an elongated support arm of each pair of elongated support arms to provide power to a corresponding sled. The power supply may include a chassis-less circuit board substrate that is removable from a power supply housing coupled to the corresponding elongated support arm.

Abstract: A power door system for a vehicle includes a door connected to a vehicle body, a door actuator comprising a clutch and a braking system and adapted to displace the door between a plurality of open positions and a fully closed position, and a controller system configured to disengage the clutch on determination of a manual door open or close operation. The controller system is further configured to engage the braking system on a determination that the manual door close operation exceeds a threshold door closing speed. The controller system is further configured to cause the braking system to stop the manual door close operation exceeding the threshold door closing speed at a spaced distance from the vehicle body, to re-engage the clutch, and to actuate a power cinch function to displace the door to the fully closed position.

Abstract: A method for controlling a fan is described and includes controlling a rotation speed of a fan according to a first rotation speed time-variable rate by a controller, and controlling the rotation speed of the fan according to a second rotation speed time-variable rate by the controller in response to a change in an operating parameter of a target device, where the fan and target device are for use in a computer system.

Abstract: If the battery temperature TB of the main battery is equal to or higher than the first temperature T0 and a noise level within a vehicle interior is equal to or higher than a predetermined value Lo during inhibition of the first constant control under a predetermined condition, the cooling system performs second constant control for driving the cooling fan with a second command value D3 and also performs the problem detection processing based on an actual rotation rate of the cooling fan during the second constant control.

Abstract: An apparatus for detecting a position of a rotor of a DC motor with N phases having a plurality of windings. The apparatus includes circuitry to couple at least two of the windings between a supply voltage and a reference voltage according to a first current path and allow the current stored in the two windings to be discharged through a second current path. The circuitry is configured to force the at least two windings at a short circuit condition in the second current path. The apparatus also includes a measurement circuit configured to measure the time period of discharging the current stored in the two windings and a rotor position detector for detecting the rotor position based on the measured time period.

Abstract: An automatic vehicle door opening and closing system is a system for a vehicle having a controller with at least one button for each door having the system installed, that allows the driver of the vehicle to open or close a preferred door on the vehicle without leaving the driver's seat. A lockout circuit prevents the doors from opening with the automatic function while the vehicle is in motion though the doors may be opened manually if not locked using the vehicle's own door lock system.

Abstract: A system and method for controlling cooling of computer components of a computing device are provided. A measurement of power consumption of at least one of the computer components is received. An amount of heat expected to be generated by the at least one computer components is determined based on the received measurement of power consumption. An output of a cooling system of the computer components is controlled based on the determined amount of heat expected to be generated.

Abstract: A control method of direct current (DC) machine includes the following steps: obtaining a target speed n, detecting a current speed nk, calculating a current rotating speed difference ek, calculating a speed base voltage W according to the current speed nk, calculating a PID adjustment voltage V according to the current rotating speed difference ek, calculating an output voltage U according to the PID adjustment voltage V and the speed base voltage W, and driving the DC machine according to the output voltage U.

Abstract: A first power control system has a first to a third motor wires and a second power control system has a fourth to a sixth motor wires. The first to the third motor wires and the fourth to the sixth motor wires are located on a concentric circle of a center of a magnet and located to be symmetrical to each other with respect to the magnet. The first and the third motor wires, which are located at both sides of the second motor wire in a circumferential direction of an electric motor portion, are asymmetrically arranged with respect to the second motor wire. The fourth and the sixth motor wires, which are located at both sides of the fifth motor wire in the circumferential direction, are asymmetrically arranged with respect to the fifth motor wire. As a result, a size of an electrical driving device can be made smaller.

Abstract: An electromechanical function unit is for a battery operated, handheld work apparatus that has an operating switch for putting the work apparatus into operation. The operating switch is to be actuated by an actuating element of the work apparatus. The operating switch is connected to a control unit for operating the work apparatus. The control unit includes a circuit board having electronic components, and has a first circuit board side, and a second circuit board side that faces away from the first circuit board side. In order to avoid wiring and to reduce the tolerance chain, provision is made to dispose the operating switch on the second circuit board side. The operating switch is supported statically via a support arrangement, independently of the circuit board. The support arrangement has no mechanical connection to the circuit board, and leads from the second circuit board side to the first circuit board side.

Abstract: A controller has an encoder that outputs four-phase pulse signals according to a rotation of a rotor of a motor by a rule. During a rotational drive of the motor, when (i) an abnormal pulse state is observed in which the pulse signal is output in a non-compliant manner with the rule and (ii) a lapse time from a last normal output timing, which is a last timing of an output of the pulse signal by the rule, is longer than a threshold determination time, it is conclusively determined that the encoder has abnormality. Thus, the encoder is provided with an improved noise-proof character, and is prevented from being falsely determined as abnormal due to the abnormal pulse state, even when an output of the pulse signal from the encoder is temporarily ridden by a noise.

Abstract: A method for operating a controller apparatus for controlling a drive apparatus having a load moment and a moment of inertia, includes determining an estimated load value of the load moment by a load moment estimator during a constant-running phase, when a drive speed of the drive apparatus is kept to a constant setpoint value by the controller apparatus, using a model to describe an association between the moment of inertia and the load moment and generating an estimated inertia value of the moment of inertia as a pilot control of the moment of inertia based on the model during the constant-running phase. Further disclosed are a controller apparatus and a drive apparatus designed to carry out the method.

Abstract: A control circuit for an inverter according to the present invention comprises a PWM circuit and a controller. The PWM circuit generates switching signals in accordance with a PWM control signal. The switching signals are coupled to switch a transformer through transistors for generating an output of the inverter. The controller is coupled to receive a command signal and an input signal for generating the PWM control signal. The input signal is correlated to an input voltage waveform of the inverter. The command signal is utilized to determine a power level of the output of the inverter. The advantages of the control circuit are lower cost, small size, good power factor and higher reliability.

Abstract: A system, apparatus, and procedure for controlling a fan module. The system comprises a chassis having a backplane, at least one fan module arranged in the chassis, and a profile switch. In one embodiment, the profile switch is arranged in the chassis. Each fan module includes at least one fan and a fan module controller arranged to receive a control signal from a shelf controller. The profile switch is arranged to signal the fan module controller so as to control the at least one fan based on operating profiles corresponding to selected switch positions of the switch.

Abstract: The present application is directed to an electrical converter having at least one of an active rectifier and an inverter interconnecting an electrical source with an electrical load. A method for controlling the electrical converter includes receiving at least one estimated control variable, receiving at least one outer loop control variable provided by an outer control loop and determining a control region based on a control error and selecting control parameters based on the control region. The control method then predicts at least one reference control value based on a solution of a physical model of the electrical converter. The solution is based on a constraint that minimizes a difference between the at least one estimated control variable and the at least one outer loop control variable. The control method then determines switching states of the electrical converter based on the reference control value.

Abstract: A method for testing the operation of an actuating circuit of a DC motor is disclosed, wherein electrical voltage connections of the DC motor are connected to a voltage source via the actuating circuit. An operating switch is arranged between the actuating circuit and the voltage source for starting up the DC motor via the actuating circuit. When the operating switch is switched on, the actuating circuit is initialized. Initialization prompts the potential on a voltage connection of the DC motor to be checked, and an indicator is actuated if, during the check, a potential on the voltage connection of the DC motor is determined that is above a prescribed limit value.