Abstract: The overheat detection device for an electric motor of the present invention includes: PTC thermistors each attached to the coil of a different phase of a three-phase AC electric motor and connected in series; an overheat determination unit for determining overheat of coils based on the output voltage from the serially connected circuit of the PTC thermistors; and, an output voltage control unit that controls the output voltage from the PTC thermistors in accordance with the electric angle or magnetic phase of the three-phase AC electric motor.

Abstract: An article destruction device includes an electric motor driving at least one moving component. An indication panel includes at least three visual indicators situated in sequence. Each visual indicator is associated with a stage of an approaching overload (motor cool down) condition. A first visual indicator lights when the motor or corresponding sensor temperature is below a first threshold, i.e., when the device is first powered on. A second indicator lights when the temperature exceeds the first threshold and is below at least a second threshold, i.e., the temperature is approaching a fault condition. A last visual indicator lights when the temperature exceeds the first and the at least second thresholds, i.e., the fault condition is met. A thermistor on the motor energizes (self-heats) with the motor. A thermostatic switch controls current flow through windings of the motor depending on measured temperatures meeting operating and equilibrium temperature thresholds.

Abstract: A method of operating a heat transfer system includes starting operation of a first heat transfer fluid vapor/compression circulation loop including a fluid pumping mechanism, a heat exchanger for rejecting thermal energy from a first heat transfer fluid, and a heat absorption side of an internal heat exchanger. A first conduit in a closed fluid circulation loop circulates the first heat transfer fluid therethrough. Operation of a second two-phase heat transfer fluid circulation loop is started after starting operation of the first heat transfer fluid circulation loop. The second heat transfer fluid circulation loop transfers heat to the first heat transfer fluid circulation loop through the internal heat exchanger and includes a heat rejection side of the internal heat exchanger, a liquid pump, and a heat exchanger evaporator. A second conduit in a closed fluid circulation loop circulates a second heat transfer fluid therethrough.

Abstract: To reduce the number of mounted components in the power conversion device and drive device. Each high-side transistor and low-side transistor has an EGE-type structure of (emitter-gate-emitter type). A high-side driver includes a first pull-up transistor configured to apply a first positive voltage to a gate based on an emitter of the high-side transistor, and a first pull-down transistor configured to couple the gate to the emitter. A low-side driver includes a second pull-up transistor configured to apply a second positive voltage to the gate based on an emitter of the low-side transistor, and a second pull-down transistor configured to couple the gate to the emitter.

Abstract: One embodiment provides a system for controlling one or more pulse width modulated (PWM) fans. The system can include a control system configured to provide a voltage control signal corresponding to a DC output voltage for the one or more PWM fans. A variable DC voltage source is configured to supply the DC output voltage to the plurality of fans at one of at least two different DC voltages based on the voltage control signal. The DC output voltage from the variable DC voltage source is separate from a PWM control signal that is also supplied to the PWM fans.

Abstract: A memory system according to an embodiment includes a non-volatile memory and a controller configured to control the non-volatile memory. The controller includes an interface and a control unit. The interface receives, from a host, a first instruction to change a performance of the memory system as a performance control instruction. The control unit controls the memory system on the basis of the performance control instruction such that the number of parallel operations of parallel operating units which are operated in parallel in the memory system is changed.

Abstract: A circuit interruption device (e.g., a molded case circuit breaker) includes at least one set of contacts, a contact actuator mechanism configured to open the at least one set of contacts and a trip control circuit configured to cause the contact actuator mechanism to open the at least one set of contacts responsive to a condition satisfying a first trip criterion and to apply a second trip criterion (e.g., a lower current level trip threshold) responsive to the opening of the at least one set of contacts. The trip control circuit may be configured to apply the second trip criterion after a succeeding closure of the at least one set of contacts. The trip control circuit may be further configured to return to application of the first trip criterion after lapse of a predetermined interval following the succeeding closure of the at least one set of contacts.

Abstract: A cooling apparatus that cools an electronic apparatus accommodated in a cabinet, the cooling apparatus includes: a plurality of cooling fans attached to the cabinet; and a control unit that controls a rotation speed of the cooling fans that have been grouped into a plurality of groups, for each of the groups, depending on a group temperature that typifies each of the groups to which the cooling fans belong.

Abstract: A system includes a monitoring and/or protection system that includes an insulation derivation circuit. The insulation derivation circuit is configured to derive a first temperature compensation curve based on a first temperature and a first current, and the monitoring and/or protection system is configured to communicatively couple to a first current sensor configured to sense the first current traversing a first phase of a stator winding of a motor, a generator, or a combination thereof. The insulation derivation circuit is also configured to communicatively couple to a first temperature sensor configured to sense the first temperature of the stator when the stator is energized, and the temperature compensation curve is configured to map a temperature to a leakage dissipation factor.

Abstract: Methods, systems, computer-readable media, and apparatuses for processing sensor data are presented. In some embodiments, a security server may receive sensor data from one or more sensors that are located at a premises. Subsequently, the security server may classify a first portion of the received sensor data as critical sensor data, (e.g., based on the first portion of the received sensor data being associated with a critical function). In addition, the security server may classify a second portion of the received sensor data as non-critical sensor data (e.g., based on the second portion of the received sensor data being associated with a non-critical function). Thereafter, the security server may process the critical sensor data, and further may provide the non-critical sensor data to a network server for processing.

Abstract: An insulated power supply apparatus includes an upper arm transformer which has a primary side coil and a secondary side coil, a lower arm transformer which has a primary side coil and a secondary side coil, and a power supply control section which has a voltage control switching element and an integrated circuit which turns on or off the voltage control switching element. At least one of the upper arm transformer and the lower arm transformer is adjacent to the power supply control section when viewing a surface of the substrate from a front thereof. An electric path transfers output voltage of the secondary side coil of the transformer adjacent to the power supply control section, to the integrated circuit. The integrated circuit turns on or off the voltage control switching element to perform feedback control so that the output voltage detected via the electric path reaches a target voltage.

Abstract: Climate regulation within an enclosure (e.g., a case of a workstation or a rack or cabinet of servers) may be achieved through a climate regulator featuring several selectable climate regulator settings (e.g., a variable-speed fan array). Controllers of such climate regulators often select climate regulator settings based on current conditions inside the enclosure, such as the temperature of one or more processors operating within the enclosure. However, such control fails to account for the climate of air outside the enclosure that is drawn in to provide climate regulation, even though the climate properties of inlet air may significantly affect the effectiveness of climate regulation. Accordingly, a controller of a climate regulator may be configured to detect inlet climate properties of air directed into the enclosure, and to map the inlet climate properties (alone or in combination with other factors) to a selected climate regulator setting for the climate regulator.

Abstract: A power supply circuit includes: an environment detecting circuit which detects an installation environment; and a voltage control circuit which makes a report of a power supply capability by performing fluctuation control of an output voltage in response to detection information of the environment detecting circuit.

Abstract: In some embodiments, the method includes measuring a first responsive voltage value for a first voltage drop between a first terminal attached to a first suspension spring of an actuator housing a voice coil motor for moving a lens assembly and a second terminal of the magnetic coil of the voice coil motor. In some embodiments, the method includes calculating a first resistance of the magnetic coil based at least in part upon the first voltage value and measuring a second responsive voltage value for a second voltage drop between the first terminal attached and the second terminal. In some embodiments, the method includes calculating a second resistance of the magnetic coil based at least in part upon the second responsive voltage value and calculating a relative temperature for the magnetic coil based at least in part upon the first resistance and the second resistance.

Abstract: A device for protecting a user includes a first current path including a first and second conduit, and a monitoring device for detecting an imminent overload of the electric user. In an embodiment, the monitoring device includes a first temperature measurement unit, a support, an evaluation unit and a first transducer to produce an electrically conductive connection between the first and second conduits of the first current path. The first temperature measurement unit is, electrically insulated from the first transducer and includes a first temperature sensor. An additional electrically insulating material; is arranged on a first lateral surface of the support between the first transducer and the support and the first temperature sensor is arranged on the support to detect a temperature of the first transducer. The evaluating unit is configured to detect an imminent overload at the user on the basis of temperatures detected by the first temperature sensor.

Abstract: Systems and methods are provided for information handling system thermal control that employ configuration-based temperature feedback, e.g., by using configuration-based fan speed control based on real time individual measured component temperatures. In one example, the disclosed systems and methods may be implemented to allow inputs from one or more hardware temperature sensors to set cooling fan speeds and/or power capping levels in a closed loop fashion, rather than relying solely (or at all) on system inlet ambient temperature.

Abstract: A cooling system includes a chassis. A thermal sensor is located in the chassis. A plurality of fan zones are located in the chassis. Each of the plurality of fan zones includes at least one fan. A first mapping is provided between the thermal sensor and a first fan zone of the plurality of fans zone, and a second mapping is provided between the first fan zone and a second fan zone in the plurality of fan zones. A controller is coupled to the thermal sensor and the at least one fan in each of the plurality of fan zones. In response to receiving a signal from the thermal sensor, the controller is operable to activate the at least one fan in the first fan zone according to the first mapping and activate the at least one fan in the second fan zone according to the second mapping.

Abstract: A motor control device includes: a coil temperature detection unit which detects a coil temperature of a motor; an upper limit current determination unit which determines an upper limit value of a coil current in which a coil temperature after a lapse of a first predetermined time from the present is maintained at an upper limit temperature or lower, every time a second predetermined time shorter than the first predetermined time elapses, by using a coil temperature detected by the coil temperature detection unit; and a coil current control unit which controls the coil current so as to be equal to or lower than the upper limit value.

Abstract: A power battery assembly may include a battery circuit and a circuit protecting unit. The circuit protecting unit may be connected in series with the battery circuit. The circuit protecting unit may include a relay and a current sensing unit connected in series with the battery circuit. A switching unit is connected with the relay for controlling the switching of the relay, and a controller is connected with the switching unit and to the current sensing unit to control switching on or switching off the switching unit based on comparison of the current value detected by the current sensing unit, and sent to the controller with a first predetermined current value.

Abstract: Methods, systems, computer-readable media, and apparatuses for processing sensor data are presented. In some embodiments, a security server may receive sensor data from one or more sensors that are located at a premises. Subsequently, the security server may classify a first portion of the received sensor data as critical sensor data, (e.g., based on the first portion of the received sensor data being associated with a critical function). In addition, the security server may classify a second portion of the received sensor data as non-critical sensor data (e.g., based on the second portion of the received sensor data being associated with a non-critical function). Thereafter, the security server may process the critical sensor data, and further may provide the non-critical sensor data to a network server for processing.

Abstract: A cooling system to be mounted in a hybrid vehicle including a motor driven and a generator includes a cooling path and a pressurizing unit. In the cooling path, coolant for cooling the motor and the generator is recirculated. The pressurizing unit pumps the coolant. The motor is disposed downstream of the pressurizing unit in a recirculating direction of the coolant. The generator is disposed downstream of the motor and upstream of the pressurizing unit in the recirculating direction.

Abstract: A system to monitor the temperature of power electronic devices in a motor drive includes a base plate defining a planar surface on which the electronic devices and/or circuit boards within the motor drive may be mounted. The power electronic devices are mounted to the base plate through the direct bond copper (DBC). A circuit board is mounted to the base plate which includes a temperature sensor mounted on the circuit board proximate to the power electronic devices. The temperature sensor generates a digital signal corresponding to the temperature measured by the sensor. A copper pad is included between each layer of the circuit board and between the first layer of the circuit board and the sensor. The circuit board also includes vias extending through each layer of the board. The copper pads and vias establish a thermally conductive path between the temperature sensor and the base plate.

Abstract: Prior to machining a workpiece, a warm-up control device for a machine tool is activated to perform a warm-up in which a main shaft rotary drive part and axes drive parts are driven. The amount of displacement of heat that is generated upon starting of the warm-up and changes with time is calculated every predetermined time period. Whether to end the warm-up is determined based on the thermal displacement amount. Whether to restart the warm-up after the end of the warm-up is determined based on the thermal displacement amount. When it is determined to restart the warm-up, the warm-up is restarted.

Abstract: A mechanism for compensating power to a motor or actuator. Compensation may counter the effects of changing voltage levels of power to the motor and varying temperatures at the motor. An output of a wave generator may be input to a comparator along with a level of voltage representing the temperatures and voltage levels. An output may be a power signal for driving the motor at a constant speed and/or torque which can increase a maintenance-free lifetime of the motor and actuator.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) system has a motor configured to selectively provide an airflow, an airflow control algorithm configured receive an input and to provide a desired control value associated with a desired actual operation value of the motor, wherein the desired actual operation value is provided as a function of the input, and a control translator configured to receive the desired control value and to provide a correlated control value to the motor, wherein the correlated control value is associated with causing the motor to operate at the desired control value.

Abstract: The system has a driving circuit for the motor of the electric fan, coupled to the electrical system of a motor vehicle and having a plurality of controlled electronic switches, and an electronic control unit arranged to control the driving circuit in such a way as to cause the flow in the motor of a variable average current capable of producing a required speed of rotation, in accordance with a predetermined relationship or function. The control unit is designed to store a predetermined threshold of rotation speed, and to control the motor through the associated driving circuit in such a way that when the rotational speed of the motor exceeds the threshold the driving circuit causes electrical braking of the motor.

Abstract: A brushless motor driving apparatus that rotates and drives a brushless motor, which has a plurality of coils, by switching energization modes corresponding to phases of the brushless motor, sequentially switches the energization modes based on a non-energized phase voltage and a voltage threshold. Also, the brushless motor driving apparatus regulates an upper threshold for energization amount based on the voltage threshold and a change in the non-energized phase voltage at timing of switching the energization mode.

Abstract: A method of limiting current to a motor. The method comprising monitoring a speed of a motor, an input voltage of a controller, and a temperature of the controller. Determining a maximum current limit for the motor based on the monitored speed when the motor speed is below a speed threshold. Determining a maximum current limit for the motor based on the input voltage and the temperature when the motor speed is above the speed threshold and the input voltage is below an input voltage threshold. Determining a maximum current limit for the motor based on the temperature when the motor speed is above the speed threshold and the input voltage is above the input voltage threshold. Or determining a maximum current limit for the motor based on the monitored speed when the motor speed is above the speed threshold and the temperature is below a temperature threshold.

Abstract: Apparatus and methods for reducing unwanted conducted noise generated by a DC load 17. Load 17 is powered by a voltage source 11. A current sense 13 senses pulse current Ifan flowing through the load 17. First converting means 14, 15, 16 converts the sensed pulse current Ifan to a correction voltage Vp. The correction voltage Vp is then converted to a correction current Ip, which offsets the deleterious effects of Ifan. The current Is flowing through the voltage source 11 equals Ifan plus the correction current Ip.

Abstract: A machine propelled by an electric motor and subject to a deration scheme is described wherein deration is specified by a combination of a temperature signal indicating a degree to which a machine component is overheating. The machine includes an electronic controller that receives a temperature signal indicative of a current temperature status of the electric motor. The electronic controller receives a motor speed signal indicative of a current speed status of the electric motor. The electronic controller calculates, in accordance with a derating scheme, a deration value for the electric motor, the deration value being determined by applying a set of current operating state parameter values to the derating scheme. The set of current operating state parameters include: a motor speed parameter value; and a temperature parameter value.

Abstract: A method for operating a direct current (DC) motor is shown and described. The method includes generating a first pulse width modulated (PWM) signal having a first duty cycle, providing the first PWM signal as a PWM DC output for the DC motor, and adjusting the first duty cycle to control a speed of the DC motor. The method further includes sensing an electric current output to the motor using a current sensor and, when the sensed current exceeds a threshold, holding the PWM DC output off.

Abstract: There are provided a pulse width modulation (PWM) signal generating circuit and a motor driving circuit. The PWM signal generating circuit includes: a proportional-to-absolute temperature (PTAT) voltage generating unit generating a PTAT voltage in proportion to an absolute temperature; a reference wave signal generating unit generating a preset reference wave signal; and a PWM signal generating unit comparing the PTAT voltage and the reference wave signal with each other to generate a PWM signal, wherein the PTAT voltage generating unit adjusts the PTAT voltage according to a control signal.

Abstract: A motor control device includes a control condition storage unit storing at least one of a control condition defined by an equivalent voltage supplied to a three-phase motor and a control condition defined by relationship between the equivalent voltage supplied to the three-phase motor and a frequency of PWM signal, a control condition extracting unit extracting the control condition from the control condition storage unit in response to a temperature of a viscous fluid supplied by a pump having the three-phase motor as a power source, and a PWM controlling unit controlling a switching element included in an inverter circuit based on a PWM signal related to the extracted control condition when the three-phase motor is started.

Abstract: A temperature estimating unit includes an energy calculating unit that calculates a heat generation energy rate of a motor on the basis of a difference between power input to the motor and power output from the motor, a heat radiation energy calculating unit that calculates a heat radiation energy rate from a target member on the basis of a difference between a previous temperature estimation value Tm of the target member and an ambient temperature, and a thermal coefficient of the target member, and an amount calculating unit that calculates a temperature increase rate of the target member on the basis of a difference between the heat generation energy rate and the heat radiation energy rate, and an estimation value calculating unit that calculates a current temperature estimation value of the target member on the basis of the temperature increase rate and the previous temperature estimation value.

Abstract: A system includes a refrigerant compressor including an electric motor, a current sensor that measures current flow to the electric motor, a switching device configured to close and open to allow and prevent current flow to the electric motor, respectively, a maximum continuous current (MCC) device that includes a resistance corresponding to a maximum continuous current for the electric motor, and a motor protection module. The motor protection module communicates with the MCC device, the current sensor, and the switching device and determines a first MCC value for the electric motor as a function of the resistance of the MCC device. The motor protection module also selectively sets a predetermined MCC to the first MCC and controls the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.

Abstract: Temperature rise in semiconductor switching element that is part of a power conversion device is estimated to assess the degradation and remaining lifetime of the switching element. This is accomplished with a heat generation amount calculation unit in a calculation processor, where current command values Id* and Iq* and voltage command values vu*, vv* and vw* are used to calculate a chip loss. Current values iu*, iv* and iw* of all output phases are estimated from the current command values. The ON/OFF loss of the chip is represented by a function of an estimated value for a current flowing in each output phase, and the loss can be derived by integration with a PWM carrier frequency f. With respect to a conduction loss, a conduction time is integrated with the estimated current value and a saturation voltage, which is a function of the estimated current value.

Abstract: A rotation speed control circuit is disclosed. The rotation speed control circuit includes a temperature-controlled voltage duty generator, a pulse-width signal duty generator, a multiplier and a rotation speed signal generator. The temperature-controlled voltage duty generator converts temperature-controlled voltage to digital temperature-controlled voltage and executes linear interpolation operation according to a first setting data so as to output temperature-controlled voltage duty signal. The pulse-width signal duty generator coverts pulse-width input signal to a digital pulse-width input signal and executes linear interpolation operation according to a second setting data so as to output a pulse-width duty signal. The temperature-controlled voltage duty signal and the pulse-width duty signal are executed for multiplication by the multiplier so as to output mixing-duty signal.

Abstract: An electric drive system may include a plurality of heat sensitive components, at least one temperature sensor positioned in or on each of the components and a system controller. The temperature sensors may be interconnected with the system controller to transmit temperature data from their respective heat sensitive components to the system controller. The system controller may be configured to transmit a reduced performance command in the event that a reached-temperature-threshold-limit signal is received from any one or more of the temperature sensors. System shutdown due to over temperature faults may be avoided.

Abstract: A motor current detection apparatus in the present invention includes: a current detection unit, a first filter, and a second filter. The detection unit detects a conduction current flowing from a battery to a brushless motor and outputs a conduction current signal corresponding to the detected conduction current. The first filter extracts a first current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a frequency band equal to or lower than a predetermined first cutoff frequency. The second filter extracts a second current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a predetermined frequency band within a frequency band equal to or lower than a predetermined second cutoff frequency higher than the first cutoff frequency and having the second cutoff frequency as a maximum value.

Abstract: A synchronous machine control apparatus is characterized by including a magnet condition estimation unit (7, 7a) that estimates the temperature or the magnetic flux of a permanent magnet that forms the magnetic field of a synchronous machine (1), and is characterized in that the magnet condition estimation unit (7, 7a) coordinate-converts an armature current into currents on the ?-? axis consisting of the ? axis and the ? axis that is perpendicular to the ? axis, based on the rotor position and the estimated ? axis, and estimates the temperature or the magnetic flux of the permanent magnet, based on the control command for the synchronous machine (1) and the ?-? axis currents.

Abstract: Disclosed are alternate embodiments of various components of a barrier operator system. and methods of operation, including of the mechanical drive subsystem with segmented and self-locking rail unit, rail mounting supports, belt and chain drive tensioning, and drive assembly carriage and interface; the electronics and software routines for controlled operation of the various barrier operator functions; wall console communications with the barrier operator; encryption and decryption of access codes; establishment and monitoring of travel limits and barrier speed and force profiles; thermal protection of barrier operator drive motors; and establishment and control of communications from the barrier operator to accessories by way of a wireless adapter.

Abstract: A fan type temperature control method and device are provided. The device includes a fan unit including a plurality of fans and cooling an apparatus to be cooled, power supplies (v1,v2) supplying power for the fans in the fan unit, and a fan control unit which controls the fans as follows: when temperature t of the apparatus is lower than critical temperature t1 of a first temperature detect switch (k01), all fans stop; when t is higher than t1 and lower than critical temperature t2 of a second temperature detect switch (k02), all fans rotate at half speed; when t is higher than t2 while lower than critical temperature t3 of a third temperature detect switch (k03), a first fan part (M1) rotates at full speed and a second fan part (M2) stops; when t is higher than t3, all fans rotate at full speed.

Abstract: Various methods related to air moving devices in electronic systems are disclosed. Various electronic systems including controlled air moving devices are also disclosed. Thus, one example electronic system includes an air moving device, a sensor for monitoring an operating parameter of the electronic system and generating a signal representative of the operating parameter, and a controller for controlling the air moving device. The controller is configured to selectively control a rotational speed of the air moving device, to receive the signal representative of the operating parameter, and to delay changing the rotational speed of the air moving device in response to the signal representative of the operating parameter.

Abstract: A drive system for a grid blower of a vehicle is provided. The system includes: an electrical bus, a grid of resistive elements connected to the electrical bus, the grid of resistive elements configured to thermally dissipate electrical power generated from braking of the vehicle, the electrical power being transmitted on the electrical bus to the grid of resistive elements, an electrical power modulation device configured to modify electrical power received from at least one of the electrical bus and the grid of resistive elements, and a grid blower motor coupled to an output of the electrical power modulation device, wherein a speed of the grid blower motor varies based on the electrical power that has been modified by the electrical power modulation device.

Abstract: A method for determining a temperature of an electric motor including stator windings includes injecting an AC current into a D-axis current of a stator winding at a frequency that is synchronized with a control frequency of the electric motor, determining a DC-phase current, determining a resistance of the stator winding corresponding to the DC-phase current and an applied voltage, and determining a temperature of the electric motor as a function of the resistance of the stator winding.

Abstract: A motor driving apparatus is applied to a fan and motor mechanism and a voltage supply unit. The motor driving apparatus includes a motor driving unit, a voltage division resistor, a first resistor, a first switch unit, a second resistor, a second switch unit, a third resistor, a third switch unit, a transistor switch, and a pulse width modulation unit. The first switch unit, the second switch unit, and the third switch unit are configured to select the rotational speed upper limitation of the fan and motor mechanism for suppressing noise.

Abstract: A fan speed control circuit is provided. The circuit includes a sensor, a control chip, a first integrated circuit, an integrated operational amplifier, a second integrated circuit, and a feedback comparator. The sensor senses a temperature of an electronic component. The control chip outputs a PWM signal corresponding to the temperature to a fan. The first integrated circuit and the second integrated circuit respectively generate a first equivalent voltage and a second equivalent voltage. The integrated operational amplifier amplifies the first equivalent voltage to generate an upper limit voltage and reduces the first equivalent voltage to generate a lower limit voltage. The feedback comparator compares the second equivalent voltage with the upper limit voltage and the lower limit voltage to generate a comparison value. The control chip adjusts the duty cycle of the PWM signal according to the comparison value, and outputs the adjusted PWM signal to the fan.

Abstract: Method for diagnosing a fan, in particular in a cooling circuit of an internal combustion engine, a current driving the fan being ascertained. The fan is triggered by a defined trigger signal, and depending on the ascertained current, a diagnosis of whether the fan is defective is performed.

Abstract: The present application discloses a control circuit for a power tool and a method for manipulating the power tool. The control circuit has a detection circuit for battery packs, a calculating control circuit, a battery capacity indicating circuit for indicating the calculation result of the battery capacity, and a current measure and calculating circuit for measuring the current flowing through motors. The calculation result further includes the voltages consumed by the battery pack internally and the discharge loop. The method for manipulating the power tool includes pressing the switch to electrically connect the motor and the battery pack, measuring the parameters of the battery pack and allowing the motor to operate or not according the measured parameters. Further, after the motor is in operation, the battery capacity is calculated and the results are displayed.

Abstract: An electric motor drive system includes a fan configured to cool power electronic components of the electric motor drive system. The electric motor drive system also includes a temperature sensor disposed proximate an air inlet of the fan and configured to sense an ambient temperature of air entering the air inlet. In addition, the electric motor drive system includes a processor communicatively coupled to the temperature sensor and configured to determine at least one of a drive prognostic and a derating requirement based on the sensed ambient temperature.