The present invention discloses an automatic test system for testing a wireless charging system. The automatic test system may comprise a robot arm, a test plane, a docking station and a control computer. The robot arm is configured to grip a first fixture. The test plane is configured to grip a second fixture. The docking station is connected to the robot arm. The control computer is configured to control the robot arm and receive test data. The second fixture is configured to grip a device under test of the wireless charging system, and the first fixture is configured to grip a test device for testing the device under test and generate test data.

A method and a device determine a movement profile of a solenoid plunger in a solenoid for monitoring a plunger-type armature movement for changes. The solenoid is an electromagnet in which a magnetic field can be generated by an electrical coil and a measuring unit is connected to the electrical coil. The method includes measuring a current profile with respect to time when the solenoid is operated, examining a measured current profile with respect to time for a position of a first reversal point in respect of time after operation of the solenoid and a current intensity, and assigning the position of the first reversal point to a movement end of the plunger-type armature.

Example implementations herein relate to electromagnetic coils. One example device includes a plurality of coil windings. Each coil winding may extend around a shared core region inside the plurality of coil windings between a respective first end and a respective second end. The respective first end is electrically connected to a respective first-end electrical contact. The respective second end is electrically connected to a respective second-end electrical contact. The device also includes a plurality of mountable components. Each mountable component electrically couples a respective first coil winding to a respective second coil winding via the respective first-end electrical contact of the respective first coil winding and the respective second-end electrical contact of the second coil winding.

An automated testing system for testing a wireless charging system is disclosed. The automated testing system may include a mechanical arm, a testing plane, a dock station and a controller computer. The mechanical arm is configured to hold a first device-under-test (DUT) clamp. The testing plane is configured to hold a second DUT clamp. The dock station is connected to the mechanical arm. The controller computer is configured to control the mechanical arm and receive testing data. The second DUT clamp is configured to hold a device-under-test of the wireless charging system, and the first DUT clamp is configured to hold a testing device for testing the device-under-test and generating the testing data.

An automated laser calibration kit for calibrating a distance between a testing device and a device-under-test (DUT) of a wireless charging system is disclosed. The calibration kit may be positioned on a wireless charging testing system. The testing system may comprise a testing plane to hold the DUT and a clamp arm to hold the testing device. The calibration kit may comprise a laser pointer configured to emit a laser beam; a reflection mirror positioned on the clamp arm and configured to reflect the laser beam to form a light point on the testing plane; and a camera configured to monitor a position of the light point.

A method for detecting radial deformation in a winding of a transformer may include synthetic aperture radar (SAR) imaging of the winding using ultra high frequency (UHF) electromagnetic signals in a first instance of the winding to obtain a first image of the winding; SAR imaging of the winding using UHF electromagnetic signals in a second instance of the winding to obtain a second image of the winding; and comparing the first image of the winding and the second image of the winding to detect a radial deformation in the winding. The UHF electromagnetic signals may be transmitted as a plurality of successive sinusoidal signals, where frequencies of the successive sinusoidal signals gradually change from a first frequency to a second frequency.

A method for detecting radial deformation in a winding of a transformer may include synthetic aperture radar (SAR) imaging of the winding using ultra high frequency (UHF) electromagnetic signals in a first instance of the winding to obtain a first image of the winding; SAR imaging of the winding using UHF electromagnetic signals in a second instance of the winding to obtain a second image of the winding; and comparing the first image of the winding and the second image of the winding to detect a radial deformation in the winding. The UHF electromagnetic signals may be transmitted as a plurality of successive sinusoidal signals, where frequencies of the successive sinusoidal signals gradually change from a first frequency to a second frequency.

Methods and apparatus for energizing a wound component are described. In one arrangement, a method of energizing a component with an alternating voltage is provided. The component comprises a coil wound on a magnetic core. The method comprises applying a voltage across the coil that has a first waveform during a first time period and a second waveform during a second time period. The second time period is subsequent to the first time period. The second waveform comprises an oscillating function comprising a sequence of identical waveforms. The first waveform is such that if the coil had zero electrical resistance the variation of flux density in the magnetic core with time would change sign at least once during the first waveform.

Methods and apparatus for energizing a wound component are described. In one arrangement, a method of energizing a component with an alternating voltage is provided. The component comprises a coil wound on a magnetic core. The method comprises applying a voltage across the coil that has a first waveform during a first time period and a second waveform during a second time period. The second time period is subsequent to the first time period. The second waveform comprises an oscillating function comprising a sequence of identical waveforms. The first waveform is such that if the coil had zero electrical resistance the variation of flux density in the magnetic core with time would change sign at least once during the first waveform.

A test device is configured for testing a specimen which has an inductor. The test device includes a controllable unit for reducing a current intensity of a current flowing in the inductor.