Abstract: An organic light-emitting device is provided which has an optical output with a high efficiency, a high luminance and a long life and which includes a pair of electrodes including an anode and a cathode, and at least one layer comprising an organic compound provided between the pair of electrodes, wherein at least one layer having a light-emitting region of the at least one layer comprising the organic compound comprises a first compound represented by the general formula (1): and a second compound having a bandgap larger than a bandgap of the first compound.

Abstract: An electroluminescent device comprising at least one electroluminescent light source (2) with an electroluminescent layer (21) for emitting a primary radiation with an emission characteristic around a mean emission direction (5), and at least one light-converting element (3) for converting at least part of the primary radiation into a secondary radiation, wherein the shape of the light-converting element (3) is adapted to the emission characteristic of the electroluminescent light source (2) so as to generate a defined correlated color temperature as a function of a viewing angle (10).

Abstract: An organic light-emitting device includes a substrate; a first electrode; a second electrode facing the first electrode; an organic layer disposed on the first electrode; and an emitting layer interposed between the organic layer and the second electrode. The concentration of inorganic impurities within the organic layer is 1000 ppb or less. The organic light-emitting device has high light-emitting efficiency, low driving voltage, high brightness, and long life span.

Abstract: In an EL element including a light emitting layer sandwiched between upper and lower electrodes, of light emitted therefrom, light totally reflected at a light emitting layer interface is not taken out, so there is a problem in that light emission efficiency reduces. Therefore, a light scattering layer in which metal particles are dispersed is provided between an electrode and the light emitting layer. According to such a structure, the light from the light emitting layer can be scattered by the metal particles and taken out, thereby improving the light emission efficiency. When plasmon is excited in the metal particles, light confined in the light emitting layer or each layer adjacent thereto can be used, thereby improving light use efficiency.

Abstract: An organic light emitting diode (OLED) device is provided. The OLED device includes: a substrate; an anode formed on the substrate; a first organic thin layer formed on the anode; an organic emission layer formed on the first organic thin layer; a second organic thin layer formed on the organic emission layer; and a cathode formed on the second organic thin layer, wherein the first and second organic thin layers are formed in a single layer or a multi-layer, and at least a part of the first or second organic thin layer is doped with or formed of an insulator. The OLED device provides excellent durability, long life-time, and increased luminous efficiency by balanced charge injection caused by doping or stacking the insulator into or on the organic thin layer.

Abstract: The dial module includes: a sheet-shaped dial having a design part on a surface of the dial; a sheet-shaped light source fixed to a back surface of the dial for illuminating the design part; and a flexible printed circuit fixed to a back surface of the light source. The dial module thus constructed enables to reduce the number of components, to facilitate assembly of a meter which employs the dial module therein, to improve the productivity, and to reduce the cost.

Abstract: A display device includes a display panel divided into a display area and a non-display area. An encapsulation member covers the display panel, and a sealant is positioned between the display panel and the encapsulation member. A desiccant member is disposed between the display panel and the encapsulation member. The display panel includes an organic layer formed in the display area and a common electrode covering the organic layer, the common electrode extending in the non-display area. The desiccant member is disposed along a periphery of the common electrode in the non-display area.

Abstract: In a method of manufacturing an organic light emitting display, an organic light emitting layer and a second electrode are sequentially formed on a first sub-electrode, and a laser beam is irradiated onto the organic light emitting layer to partially remove the organic light emitting layer, so that the first sub-electrode is electrically connected to the second electrode. Thus, even though the second electrode is formed to have a small thickness in order to maximize an amount of light that is generated by the organic light emitting layer and exits to an exterior through the second electrode, the second electrode is electrically connected to the first sub-electrode, thereby reducing an electrical resistance of the second electrode.

Abstract: A PDP is proposed which has high emission efficiency and which can decrease address discharge voltage. In a column direction of at least one of transparent electrodes, which perform sustain discharge via respective discharge gaps of a pair of row electrodes and constituting a row electrode pair, is set to 150 ?m or less, and partial pressure of xenon in discharge gas sealed in a discharge space is set to 6.67 kPa or more. A width of a scan electrode, which is one row electrode of each of the row electrode pair facing the column electrode and to which scan pulse is applied, is wider than a width of the other row electrode of the pair to which discharge sustain voltage is applied.

Abstract: A protective layer of a plasma display panel includes smoky magnesium oxide, the smoky magnesium oxide having single crystal magnesium oxide with a plurality of cavities therein.

Abstract: A fluorescence particle 17 according to the present invention is used for a light emitting display device and is made of a fluorescent material. The fluorescent material has at least one element 18 selected from the group consisting of Al, Mg, Ca, Ba, Sr and Y. Within a range 17a from the surface 17s of the fluorescence particle through a depth of 20 nm, the at least one element 18 has a local maximum of its concentration profile in the depth direction.

Abstract: Disclosed is an EEFL and LCD device using the same, the EEFL comprising: a glass tube coated with a fluorescent material therein and filled with discharge gas, main electrodes at both ends of the glass tube and sub-electrodes formed at an outer surface of the glass tube and being respectively spaced from the main electrodes, or comprising: a glass tube coated with a fluorescent material therein and filled with discharge gas, main electrodes at both ends of the glass tube, sub-electrodes at an outer surface of the glass tube and being respectively spaced from the main electrodes and electrode connection lines connecting each of the main electrodes and the sub-electrodes to each other.

Abstract: A cold cathode tube lamp is fed with power from a first conductive member and a second conductive member provided outside in a mounted state, and includes a glass tube, first and second internal electrodes provided inside the glass tube, a first external electrode provided outside the glass tube and connected to the first internal electrode, a second external electrode provided outside the glass tube and connected to the second internal electrode, a first insulating layer coated on the first external electrode, and a second insulating layer coated on the second external electrode. In a mounted state, the first conductive member and the first external electrode are capacitively coupled together, and the second conductive member and the second external electrode are capacitively coupled together. With such a structure, parallel lighting can be achieved by parallel driving.

Abstract: There is described a brazing alloy having a first component comprising a source of molybdenum and a source of aluminum and a second component comprising boron, wherein a weight ratio of said second component to said first component is not greater than 1:20. The addition of boron results a substantially lower melting point than alloys employing molybdenum and aluminum alone. It is suitable for use in discharge vessels having a hollow bodies selected from the group of monocrystalline alumina, polycrystalline alumina and aluminum nitride; metallic electrode holders fitted into ends of the hollow body; and sealed thereto by a braze.

Abstract: A high intensity discharge lamp comprises an arc tube, which encloses an arc chamber. The arc chamber contains a gas fill and the arc tube is terminated by at least one sealed portion. The sealed portions enclose an electrode assembly. The electrode assembly comprises an electrode, a lead-in wire and an electrically conducting foil. The electrode extends into the arc chamber. The lead-in wire extends outward from the sealed portion for providing electric contact with a power supply. The electrically conducting foil connects the lead-in wire and the electrode and provides a sealed electric connection through a sealed portion of the arc tube. At least one of the electrodes is provided with surface irregularities in a region between the foil and the arc chamber in order to control shape and size of cracks in a seal wall surrounding the electrodes. In the method, an electrode of predetermined geometry and structure is provided with at least one artificial surface irregularity.

Abstract: A metal halide lamp with a more stable lamp voltage, comprising a ceramic discharge vessel which encloses a discharge space, in which a first and a second electrode are arranged, which discharge vessel has a central zone extending between the electrodes and being closed at either side by a first and a second end zone, respectively, in which the first end zone surrounds, with little clearance, a current supply conductor connected to the first electrode and extending to the exterior through a seal to the wall of the first end zone, which current supply conductor has a halide-resistant section facing the discharge space and a section remote from the discharge space, wherein the halide-resistant section of the first current supply conductor comprises a wire made of tungsten or of tungsten alloyed with molybdenum.

Abstract: A metal halide lamp includes a ceramic discharge vessel and two electrodes. The discharge vessel encloses a discharge volume containing an ionizable gas filling including at least a metal halide, two current lead-through conductors connected to the respective electrode, and a seal having sealing material through which at least one of the respective current lead-through conductors issues to the exterior of the discharge vessel. The sealing material of the seal includes a ceramic sealing material with cerium oxide, aluminum oxide and silicon dioxide as a mixture of oxides and/or one or more mixed oxides.

Abstract: The invention relates to a mercury source for a low-pressure discharge lamp comprising an amalgam body which is arranged on a front surface of a wire or enclosed in a perforated structure. The amalgam body or the perforated structure is provided with a protective coating with a getter effect. The invention enables a simple production process to be implemented with low costs in terms of materials.

Abstract: A two-dimensional circuit for a traveling-wave tube for millimeter and sub-millimeter electromagnetic waves synchronously interacts with an electron beam in a vacuum electronic microwave amplifier or oscillator. The circuit is a solid body having a length along the tube axis. The solid body has an electrically conductive top section and an electrically conductive bottom section. The top section is configured with a plurality of vertical vanes having a width and height and configured parallel to each other. The bottom section is similarly configured such that when the circuit is viewed in cross section along the length, the vanes on the bottom section are staggered with respect to the vanes on the top section. The top section and the bottom section are separated from each other to define a tunnel through the solid body along the length.

Abstract: The present invention includes a Zener diode connected between a helix electrode and an anode electrode, a transistor that closes or opens a circuit between a cathode and an anode of the Zener diode, a photocoupler for turning ON/OFF the transistor through a phototransistor, a first switch for supplying or cutting off a DC voltage for the photodiode of the photocoupler, a capacitor to which the DC voltage that is to be supplied to the photodiode is applied and a control unit that turns ON the first switch beforehand to apply a DC voltage to the photocoupler and the capacitor and that turns OFF the first switch simultaneously with an application of a helix voltage.

Abstract: An ultraviolet lamp system for irradiating a substrate includes a magnetron and a memory physically attached to the magnetron. An electrodeless lamp is configured to emit ultraviolet light when excited by microwave energy generated from the magnetron. Main control circuitry is operable to read and write operational data associated with the magnetron to the memory. The ultraviolet lamp system is operated by generating microwave energy from the magnetron. A plasma within an electrodeless lamp is excited with the microwave energy to emit ultraviolet light. Operational data associated with the magnetron is tracked and written to the memory associated with the magnetron.

Abstract: A current-regulated light emitting device for vehicle use includes a light emitting unit and a current limiting unit. The current limiting unit includes first and second switches and first and second bias units. The first switch is for making and breaking an electrical circuit between the light emitting unit and an electric power source. The first bias unit is for causing the first switch to conduct so as to activate the light emitting unit when the first bias unit receives a drive voltage from the electric power source. The second bias unit is for causing the second switch to conduct when amount of current flowing through the first switch exceeds a predetermined threshold, thereby turning off the first switch to interrupt current flow through the light emitting unit.

Abstract: A discharge lamp having a visual-change timer is described. The visual-change timer is comprised of a ceramic material that provides an indication of the cumulative operating time of the lamp. The visual-change timer is expected be a help to consumers in avoiding unnecessary, premature, and costly lamp replacement and a help to lamp manufacturers in verifying the validity of warranty claims for replacement lamps.

Abstract: Controlling a lighting system, which comprises a controller (2, 10), lighting units (6), and a sensing device. Each lighting unit comprises a lighting source (12) and a modulated light source (14). A single light source may be used to function as both the lighting source and the modulated light source. Each modulated light source emits uniquely modulated light. A radiation pattern of each modulated light source coincides substantially with a radiation pattern of a lighting source of the same lighting unit. The sensing device is suitable to sense modulated light in a viewing area. Lighting units from which the sensing device senses modulated light are identified from the modulation of that modulated light. The sensing device measures the intensity of the modulated light from the identified lighting unit. The lighting sources are controlled dependent on control data which comprises measuring values of measured light intensities.

Abstract: Power factor correction and driver circuits and stages are described. More particularly, power factor correction circuits are described that utilize an auxiliary inductor winding for power regulation. Driver circuits configured for electrical loads such as series arrangements of light emitting diodes are also described. An exemplary embodiment of a driver circuit can implement a comparator and/or a voltage regulator to allow for improved output current uniformity for high-voltage applications and loads, such as series configurations of LEDs. Embodiments of PFC stages and driver stages can be combined for use as a power supply, and may be configured on a common circuit board. Power factor correction and driver circuits can be combined with one or more lighting elements as a lighting apparatus.

Abstract: An apparatus method and system are provided for power conversion, to supply power to a nonlinear load such as a plurality of light emitting diodes. An exemplary apparatus comprises a first power converter stage, a second power converter stage, a plurality of sensors such as first and second sensors, and a controller. The first power converter stage includes a power switch and a first inductor having a first inductance. The first and second sensors are both coupled to a common reference node, with the first sensor adapted to sense a first parameter of the first power converter stage, and the second sensor adapted to sense the output current level. The second power converter stage includes a second inductor having a second inductance, and is couplable to provide an output current to the nonlinear load such as LEDs.

Abstract: To a constant-current power supply whose output current can be variably set, light emitting modules can be connected in parallel. A control unit recognizes connection information outputted from an information output unit provided in each of the light emitting modules and varies the output current of the constant-current power supply. Drive can be controlled in response to a state of the connected light emitting modules such as the connecting number of light emitting modules.

Abstract: A feedback circuit is utilized in a DC/AC inverter having a first power switch and a second power switch for driving a fluorescent lamp. The feedback circuit includes a protection circuit for disabling the first power switch and the second power switch when no fluorescent lamp is electrically connected, a first capacitor having a first terminal electrically connected to an output of the DC/AC inverter, a second capacitor having a first terminal electrically connected to a ground, and a second terminal electrically connected to a second terminal of the first capacitor, a diode having an anode electrically connected to the second terminals of the first and second capacitors, and a cathode electrically connected to the protection circuit, and a first resistor having a first terminal electrically connected to the cathode of the diode, and a second terminal electrically connected to the ground.

Abstract: A driving device includes a first switch element to switch between applying or not applying to a light-emitting element a voltage directed to setting the light-emitting element in an ON state, and a constant current control circuit to adjust a current flowing through the light-emitting element when the light-emitting element is in an ON state to a predetermined current value.

Abstract: An apparatus and method for driving a lamp are provided. In one embodiment, an inverter having four switching elements is split into two inverter arms that are deployed at separate terminals of a floating lamp structure to achieve even light output. A controller drives both inverter arms such that power switching lines do not cross the floating lamp structure. In one embodiment, the controller adjusts the brightness of the lamp structure by adjusting the phase difference between outputs of a first inverter arm relative to a second inverter arm. In one embodiment, the controller adjusts the brightness by symmetrically pulse width modulating the outputs of the first inverter arm and the second inverter arm.

Abstract: A first voltage comparator makes a comparison between a first detection voltage that occurs at one terminal of a first resistor and a predetermined first threshold voltage. A second voltage comparator compares a second detection voltage that occurs at one terminal of a second resistor with a predetermined second threshold voltage. A logic unit generates a switching signal, the level of which is switched according to the output signals of the first voltage comparator and the second voltage comparator, and outputs the switching signal thus generated to the gate of a switching transistor. After a predetermined period of time elapses after the switching signal is switched to the level which turns off the switching transistor, an automatic restart circuit forcibly switches the switching signal to a level which switches the switching transistor to the ON state.

Abstract: A power supply with a capacitor providing an output voltage. A switch is connected between a voltage source and the capacitor. A control terminal of the switch has a switching threshold. The switch conducts a charging current from the voltage source into the capacitor. A control circuit controls the switch on when the voltage source is below a predetermined level and off when the voltage source is above the level. A control voltage supply circuit provides a control supply voltage. A control terminal voltage for the switch derived from the control supply voltage with a magnitude in excess of the switching threshold drives the switch on in a saturated region of operation.

Abstract: A circuit with a magnetically variable inductor that is placed in close proximity to an independently wound control coil and connected in parallel to a current transformer having primary and secondary windings wound on a magnetic core wherein the transformer core with associated windings. The inductor core is placed within the bore of the control coil and an optional focusing armature concentrates the magnetic field at the poles. Application of a control current forms poles at the control coil extremities and causes a change in magnetic properties of the inductor core thereby altering the power output of the current transformer inversely to the magnitude of the control current. The control current from the output of the secondary coil of a current transformer in series with the load and conditioned by a feedback conditioning circuit modulates the level of the control current. The magnetically variable inductor controls a D.C. to A.C.

Abstract: A method for controlling the operation of a lighting unit comprising a plurality of lighting elements and a dimmable power supply unit with an output for adjusting the brightness of at least some of the lighting elements. The method provides that for at least one dimmer setting at least one real electrical parameter is measured, as a function of the absorption of the lighting elements and that the measured electrical parameter is compared with at least one previously-stored theoretical value.

Abstract: An electronic ballast has control circuitry to operate a gas discharge lamp in both full and dimmed illumination modes. The electronic ballast also includes a full power circuit having a power control coupled to the dimming controller output to receive the dimming controller signal, a filament heating circuit having a heating input coupled to a reduced power circuit to receive a reduced power signal and a heating output that can couple to the filaments of one or more lamps. When the full power circuit receives the dimming controller signal, via the power control, and the dimming controller signal is not in the dimming request range (i.e. the full illumination mode has been selected), the full power circuit generates a full power signal capable of driving/operating the lamp(s) in the full illumination mode. When the reduced power signal is present, the filament heating circuit generates and provides a filament heating signal to the filaments, via the heating output.

Abstract: Radiation systems, including apparatuses and methods, for providing multiple independent RF electron accelerators with RF power from a single RF generator. The radiation systems may be employed in radiation treatment systems for treating subject objects by irradiating them from different directions and in inspection systems for producing images of the contents of a container or other volume in multiple planes using RF electron accelerators that receive RF electromagnetic power from a single RF generator. The radiation systems include RF drive subsystems each having a 3 dB directional coupler connected between an RF generator and RF electron accelerators. Each 3 dB directional coupler divides RF electromagnetic power received from the RF generator into equal or unequal portions for delivery to respective RF electron accelerators.

Abstract: A vehicle comprising a rotatable wheel (e.g., three rotatable wheels), a forward drive mechanism including a forward drive motor (e.g., an internal combustion engine), and a reverse drive mechanism. The reverse drive mechanism includes a reverse drive motor (e.g., an electric motor) adapted to move the chassis in the rearward direction, and a reverse drive control programmed to inhibit operation of the reverse drive mechanism when the forward drive motor is off. In one embodiment, the vehicle includes a battery for operating the reverse drive motor, and the reverse drive control is programmed to inhibit operation of the motor when a characteristic of the battery (e.g., an output voltage) falls below a threshold. The vehicle can further include a temperature sensor for the reverse drive motor. In this embodiment, the reverse drive control is programmed to inhibit operation of the reverse drive motor when the temperature of the motor exceeds a threshold.

Abstract: A method of operating a power system is provided. The method may include running one or more of a plurality of generator units that each include a power source, a first electric generator, and a second electric generator. Additionally, the method may include supplying electricity from one or more of the first electric generators of the one or more running generator units to a first set of one or more electric power loads. The method may also include supplying electricity from one or more of the second electric generators of the one or more running generator units to a second set of one or more electric power loads.

Abstract: A container, adapted to be opened/closed automatically by induction actuated, includes a container body, cover, motor and actuating device, wherein the motor is connected to the driven element of the cover through the actuating device. The dustbin includes a sensing and controlling device of the stroke of the cover, wherein a cover stroke perception and a shut off circuit, the cover stroke perception is connected with the shut off circuit, and the shut off circuit is connected with the motor, the shut off circuit receives the activating signal from the cover stroke perception and then controls the motor to actuate correspondingly, the cover's stroke inducted by the trigger; point of the cover stroke perception is less than the whole stroke during the closing of the cover. The noise of the crash between the cover and the container body is low, and closing of the cover is rapid and spiffy.

Abstract: Methods and apparatus are provided for reducing torque ripple in a permanent magnet motor system comprising a permanent magnet motor coupled to an inverter. The method comprises the steps of receiving a torque command, generating a torque ripple reduction signal in response to the torque command, modifying operational control signals in response to the torque ripple reduction signal to generate reduced ripple operational control signals, and providing the reduced ripple operational control signals to the inverter for control of the permanent magnet motor.

Abstract: A rotating electrical machine control device includes an inverter; a resolver; a unit; a three-phase/two-phase modulation switching unit; and a motor control unit that switches to a two-phase modulation in a specific region where an electric noise given to the resolver by a rotating electrical machine is large, even in a region where the modulation ratio is smaller than the three-phase/two-phase modulation switching boundary.

Abstract: A controller of a multi-phase electric motor includes a drive section for driving the multi-phase electric motor, a single current detection section for detecting a current value of the multi-phase electric motor, a pulse width modulation signal (PWM) generation section for generating a PWM signal of each phase based on the current value detected by the current detection section and a saw-tooth signal having a predetermined frequency, a current detectability determination section for determining whether or not the current value is detectable in the current detection section based on the PWM signal of each phase generated by the PWM signal generation section, and a switching number determination section for determining whether or not conducting number of the upper arm switching element is an even number or an odd number based on the determination that the current is not detectable by the current detectability determination section.

Abstract: The invention relates to a method for variation of a rated current which is specific of a motor by providing a rated current basic value signal (2) depending on a rated current basic value of the motor Irated, and by detecting an actual temperature Tact, providing a corresponding temperature signal (4), determining an actual rated current Iact depending on the rated current basic value signal (2) and the temperature signal (4), and providing a corresponding rated current signal (6). Additionally, the inventive method allows to determine the actual rated current depending on the speed of the motor. The invention also relates to a device for varying the rated current of a motor depending on a temperature and optionally depending on a speed of the motor. The inventive device can be used in a measuring system for determining the utilization rate and for monitoring the temperature of a motor.

Abstract: A controller computes a pinching amount of an object caused by a window glass. The controller estimates a prior pinching amount of the object caused by the window glass before the controller computes the pinching amount of the object. The controller confirms occurrence of the pinching of the object based on the computed pinching amount and the estimated prior pinching amount of the object.

Abstract: A motor control apparatus includes: an electric motor having an outer rotor and an inner rotor which can alter mutual relative phases; a phase alternation device which alters the relative phase; a phase position sensor which detects a phase position with respect to the relative phase; and a fail-decision control unit which sets the relative phase as a maximum value or a minimum value (that is, a most forcing phase and a most weakening phase) in a phase variable area of the phase alternation device in accordance with a rotation number of the electric motor when the phase position sensor does not work.

Abstract: In normal mode, a central unit of an electronic control device receives desired and actual values for determining desired current values which are transmitted to an electronic drive unit. The central unit of the electronic drive unit receives the desired current values for determining drive signals for circuit breakers. In monitoring mode, the central unit of the electronic control device checks whether an connected electric motor is in a safe state. If not, the control device transmits disconnection signals to a disconnection device and to the drive unit. The central unit of the electronic control device generates checking information for the drive unit. In the monitoring mode, the central unit of the drive unit checks whether a disconnection signal is transmitted to the central unit and whether the checking information is correct.

Abstract: The system includes a plurality of vertically spaced medication trays with a base assembly and a motor, responsive to computer commands, mounted on the base assembly. A drive shaft case member extends vertically from the base assembly. A cam assembly includes a plurality of spaced cam members, each cam member having concave portions and lobe portions on a peripheral surface thereof. A first drive clutch selectively engages the motor with both the drive shaft case member and the cam assembly for rotation of both in one direction, while a second drive clutch selectively engages the motor with just the cam assembly for rotation thereof in an opposing direction. The drive shaft case member has a cam follower assembly associated with each cam member, wherein one portion of the cam follower assembly engages the cam element and another portion engages an associated tray when the cam follower engages a selected concave portion on the cam element associated with the tray.

Abstract: A multiple-winding induction machine may be used to obtain a reduced-speed-variation electric drive when using a variable-frequency power distribution system. Each winding may have a different number of poles. The winding with the smallest number of poles may operate the machine at the lowest bus frequency, while the winding with the largest number of poles may operate the machine at the highest bus frequency. In one embodiment, a third winding, with a middle number of poles, may operate the machine at the middle frequency ranges. The speed of the induction machine is a function of the electrical frequency and the number of the winding poles. Therefore, the operating speed range can be reduced by switching from one winding to another. According to the present invention, windings with different numbers of poles can be designed to achieve different reductions in speed variation.

Abstract: The motor driving inverter circuit module includes first-phase, second-phase, and third-phase high voltage drivers generating first-phase, second-phase, and third-phase upper arm and lower arm driving signals in response to input signals for driving the first-phase, second-phase, and third-phase upper and lower arms and a first-phase, second-phase, and third-phase upper arm and lower arm transistors, generating first-phase, second-phase, and third-phase motor driving output signals in response to the first-phase, second-phase, and third-phase upper arm and lower arm driving signals of the first-phase, second-phase, and third-phase high voltage drivers. The first-phase, second-phase, and third-phase high voltage drivers and the first-phase, second-phase, and third-phase upper arm and lower arm transistors are respectively integrated into separate chips.

Abstract: A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch to control current flow and terminal voltages in the AC motor. The system also includes a controller connected to the circuit and configured to modify a switching time of the at least one switch to create a DC component in an output of the system corresponding to an input to the AC motor and determine a stator winding resistance of the AC motor based on the injected DC component of the voltage and current.