Abstract: The invention relates to an electric motor comprising a rotor, a stator (1) and an electronic housing (12), the installation space (13) of which accommodates electrical/electronic components (18). At least part of these components (18) is seated on a printed circuit board (19). A fan wheel (21) is located inside the installation space. It is arranged and designed in such a manner that it generates a cooling circuit stream in the installation space (13), in which the air is drawn in centrally from the fan wheel (21) and is discharged approximately radially to the outside. As a result of this defined cooling air stream, the components (18) are evenly cooled in the installation space (13). The fan wheel (21) consists at least of a base body which comprises blades (22) located between a cover disc (24) and a base disc (23). In this way, the fan wheel (21) generates a directed cooling air stream for cooling the heat-generating components.

Abstract: A rotating electric machine having a fraction slot configuration in which the number of slots per pole per phase is not an integer includes: a stator that includes a stator core provided with a plurality of slots, and a stator winding having a plurality of coil sides accommodated in the plurality of slots and a plurality of coil ends connecting the same side end parts of the plurality of coil sides to each other; and a movable element that is supported to be movable with respect to the stator, and includes a movable element core, and a plurality of movable element magnetic poles provided in the movable element core. The stator winding includes a plurality of basic coils in which the magnitude of magnetomotive force generated by the plurality of coil sides forming the one-phase band is uniform in each of the plurality of movable element magnetic poles.

Abstract: In the rotary electric machine according to the present invention, a plurality of core sheets include linked core sheets that include linking portions that protrude circumferentially from flange portions so as to link together tip portions of adjacent tooth portions, at least one sheet of the linked core sheets is formed such that a tooth tip portion shape is mirror-asymmetrical relative to a tooth central axis that passes through a circumferential center of the tooth portions, and a stator core is configured by laminating the linked core sheets such that circumferential positions of the linking portions are offset.

Abstract: An electrical connector for connecting a motor and a cable connector, includes an electrically insulating main body and a plurality of electrical terminals. The main body includes a front side and a rear side configured to be engaged with a corresponding cable connector. The front side of the main body includes a mounting portion, which is configured to be stably mounted on the seat, so that the electrical terminals can be placed in a stable connection with corresponding motor terminals.

Abstract: An inner-rotor motor including: an armature assembly including a rotating shaft, an armature unit coupled to the rotating shaft and a pressing unit; a frame assembly including a frame housing the armature unit, a first bearing unit located on one side with respect to the armature unit in an axial direction, and a second bearing unit located on another side with respect to the armature unit in the axial direction; and an urging structure that urges the rotating shaft in a direction away from the second bearing unit and that presses the pressing unit toward the first bearing unit.

Abstract: An electric motor includes a stator core formed by stacking a plurality of electromagnetic steel sheets, a rotor core provided on an inner side of the stator core and formed by stacking a plurality of electromagnetic steel sheets, a rotating shaft having one end side inserted into the rotor core, and an eccentric portion provided on another end side of the rotating shaft and placed in a compression mechanism, in which a length from a center of the rotor core in an axial direction of the rotor core to an end face of the rotor core in the axial direction of the rotor core is shorter than a length from a center of the stator core in an axial direction of the stator core to an end face of the stator core in the axial direction of the stator core.

Abstract: A switch mode power supply controller includes a switch terminal adapted to be coupled to an inductor that drives a load, high- and low-side switches a pulse width modulation (PWM) circuit, and a current monitor circuit. The PWM circuit is coupled to a feedback terminal for receiving a feedback signal, and alternatively drives the high-side switch and the low-side switch with a duty cycle set using the feedback signal to regulate an output voltage to a desired level in a work mode, and keeps both the high-side switch and the low-side switch non-conductive in a non-work mode. The current monitor circuit provides a current monitor signal representative of a current driven from the inductor to the load, wherein the current monitor circuit forms the current monitor signal by measuring an inductor current during a work mode, and by emulating the inductor current during a non-work mode.

Abstract: The present invention discloses a novel electric motor, which comprises a stator and a rotor. The stator is a permanent magnet. The rotor comprises a rotor coil and a capacitor. The rotor coil and the capacitor are connected in series to form a resonant driving circuit. The resonant driving circuit is used to convert a natural electromagnetic field into a current to drive the rotor to rotate. The motor of the present invention can rotate without any external power, thereby solving the technical problem that the use of the external power makes a restriction to the further development and application of the motor, and solving the problem of motor energy consumption.

Abstract: A landing bearing assembly for a rotary machine having a stator assembly, a rotor assembly and a magnetic bearing. The landing bearing assembly having a stator landing portion integral with the stator assembly and a rotor landing portion integral with the rotor assembly. A first coating, which is an anti-wear and/or an anti-friction coating, is dispensed on at least one of the stator landing portion and the rotor landing portion. The invention also concerns such a rotary machine.

Abstract: A vibration motor is disclosed. The vibration motor includes a housing; an elastic connecting piece; a fixed component; a vibrating component comprising a counterweight suspended in the housing by the elastic connecting piece; and a damping piece accommodated in the housing and fixed on the counterweight. One of the fixed component and the vibrating component includes coils, and the other includes a magnet. The counterweight includes a restricting protrusion extending from a side facing the elastic connecting piece for abutting against and restricting the damping piece.

Abstract: An overshoot reduction circuit for a buck converter includes an operational amplifier, a first sampler circuit, a pulse generator circuit, a pulse calculator circuit, a second sampler circuit and a comparator. The operational amplifier outputs an operation amplified signal according to a buck converted signal of the buck converter and a voltage feedback signal of the operational amplifier. The first sampler circuit samples a first capacitor voltage signal according to a lower bridge conducted signal of the buck converter. The pulse generator circuit outputs a pulse signal. The pulse calculator circuit outputs a first sample compared signal according to the first capacitor voltage signal and the pulse signal. The second sampler circuit samples a second capacitor voltage signal according to the lower bridge conducted signal. The comparator compares the second capacitor voltage signal with the first sample compared signal to output a comparing signal to the buck converter.

Abstract: Systems and methods are provided for protecting a power conversion system. A system controller includes a two-level protection component and a driving component. The two-level protection component is configured to detect an output power of a power conversion system and generate a protection signal based on at least information associated with the output power. The driving component is configured to generate a drive signal based on at least information associated with the protection signal and output the drive signal to a switch associated with a primary current flowing through a primary winding of the power conversion system. The driving component is further configured to generate the drive signal corresponding to a first switching frequency to generate the output power equal to a first power threshold and generate the drive signal corresponding to a second switching frequency to generate the output power equal to a second power threshold.

Abstract: A method and device for providing isolated power transfer to a low-power load across a capacitor of a series resonance circuit are shown. The method includes comparing an output voltage received via a feedback loop with a desired output voltage. Responsive to determining that the output voltage is not equal to the desired output voltage, the method determines a sub-harmonic order of the resonant frequency of the series resonance circuit to use as a switching frequency and switches the series resonance circuit at substantially the determined subharmonic order of the resonant frequency.

Abstract: A power converter includes a current-monitoring on-state controller that is configured to adjust the timing of a switch-mode voltage conversion stage of the power converter. For example, the timing of the turn-on of a MOSFET associated with a buck converter operated in a discontinuous conduction mode (e.g., quasi-resonant) can be adjusted based on a zero crossing of current through a tank inductor also associated with the buck converter. More particularly, the MOSFET may be turned on after a predetermined delay is initiated after current through the tank inductor reaches zero. The predetermined delay is based on a resonance period defined by the characteristic capacitance of the MOSFET and the inductance of the tank inductor.

Abstract: An electric transformer circuit for connecting electrical equipment, such as a renewable energy-based generator or an energy storage system, to an electric grid. The circuit includes a first voltage converter connected to the equipment; a transformer connected to the first converter and a second voltage converter connected to the transformer and the electric grid. The transformer is a weakly coupled transformer, the magnetic coupling between the first coil and the second coil being less than 0.7. The transformer includes a first and second capacitor respectively associated with a first and second coil so as to form, with the corresponding coil, a circuit resonating at frequency f0. The electric transformer circuit can be included in an electric installation.

Abstract: Disclosed examples include isolated dual active bridge (DAB) DC to DC converters with first and second bridge circuits, a transformer with a sense coil, and a secondary side control circuit to provide secondary side switching control signals to regulate an output voltage or current signal by controlling a phase shift angle between switching transitions of the secondary side switching control signals and switching transitions of a secondary side clock signal, where the secondary side control circuit includes a clock recovery circuit to synchronize the secondary side clock signal to transitions in a sense coil voltage signal of the sense coil.

Abstract: A low dropout amplifier may include an error amplifier having first and second inputs coupled to a reference signal and a feedback signal, respectively. The error amplifier may be configured to generate first and second error signals at first and second outputs, respectively, with the first and second error signals based upon a difference between the reference signal and the feedback signal. A sink stage may be coupled to the first output and configured to generate a sink current based upon the first error signal. A source stage may be coupled to the second output and configured to generate a source current based upon the second error signal. An output node may be coupled to receive the sink and source currents.

Abstract: In one embodiment, a control circuit may be configured to form a switching signal to switch a power transistor at a frequency to regulate an output voltage of the power supply to a target value wherein the control circuit is configured to operate in a normal operating mode and a start-up mode and wherein the control circuit is configured to switch the switching signal at a target frequency in response to operating in the normal operating mode. A first circuit may be configured to control the frequency of the switching signal to increase from a first frequency to a second frequency that is less than the target frequency in response to operating in the start-up mode.

Abstract: An electric motor rotor mechanism includes a plurality of rotor bars and a rotor core. The rotor bars are disposed on the rotor core. The rotor core has a plurality of lines of barriers and a plurality of flux barrier holes. Each of the lines of barriers extends from one of the rotor bars to another one of the rotor bars. The flux barrier holes are arranged along the lines of barriers. Each of the flux barrier holes is a magnetic flux barrier. An area between each adjacent flux barrier hole is a magnetic flux path.

Abstract: An apparatus includes first and second power converter stages, each stage having a primary side and a secondary side. The primary side of the first stage includes a switch T1A coupled to a voltage source and a switch T3A coupled to the switch T1A. The primary side of the second stage includes a switch T2A coupled to the switch T3A and a switch T4A coupled to the switch T3A and to the voltage source. The apparatus includes a control circuit to control an on/off time of the switches. The control circuit includes four gate driver controllers to control the on/off time of the switches and a current sharing control section to increase or decrease the on time of a switch based on a comparison of a current through one of multiple output inductors to an average current through the multiple output inductors.