An electronic control unit includes two inverters, a magnetic sensor, a failure detection unit, an inverter driving unit, a signal examination unit, and a failed element identification unit. The magnetic sensor detects a magnetic flux generated around a winding. The failure detection unit detects an ON-state failure of the inverter. When the ON-state failure is detected, the inverter driving unit stops driving the inverter to which the ON-state failure has been detected, and continues driving the other inverter. The signal examination unit examines a presence or absence of a special signal. When there is a signal appearing according to a special magnetic flux, the failed element identification unit identifies a failed switching element based on a motor electric angle generated by the signal.

An aircraft power generation unit to generate direct current (DC) power provided to a load includes a permanent magnet generator (PMG) that includes first, second, third and fourth sets of windings, each of the winding sets including three windings and a rectifier section with four six pulse rectifiers the produce outputs of Vdc1 to Vdc4 respectively and a common local output bus. The unit also includes an output bus configured to be connected to the load and including a positive output bus rail and a negative output bus rail and a controller that receives an input signal from at least one of the output sets and selectively couples either the common local output bus and fourth rectifier negative rail to the output bus negative rail and one or more of the first to third six-pulse rectifiers to the output bus positive rail to provide a constant voltage to the load.

An AC excitation synchronous rotating electric machine includes a multi-phase coil, an armature core, an outer yoke core, a field-winding-less rotor and a controller. The armature core has the multi-phase coil wound thereon. The rotor is rotatably disposed so as to face the armature core and includes magnetic poles each having a facing portion and a magnetic reluctance portion. The facing portion is provided at one axial end of the magnetic pole so as to face the outer yoke core and allow magnetic flux to flow therebetween. The magnetic reluctance portion is provided at the other axial end of the magnetic pole to impede the magnetic flux from flowing therethrough. The controller controls supply of multi-phase alternating current to the multi-phase coil so that magnetomotive force generated in the armature core is applied to the magnetic poles, thereby causing the magnetic poles to operate as a DC field.

A power tool with a combined printed circuit board (PCB) that reduces internal wiring of the power tool and provides a large amount of air flow to internal components. In some instances, the combined PCB has a surfboard shape and includes a motor control unit and power switching elements (Field Effect Transistors or FETs). The combined surfboard PCB is located above the trigger, but below the motor and drive mechanism. In other instances, the combined PCB has a doughnut shape and is located coaxially with a motor shaft. The combined PCB may be positioned between a doughnut-shaped control PCB and the motor.

A transverse flux reciprocating motor and a linear compressor including the same are described. The transverse flux reciprocating motor includes an outer stator including a stator core, a teeth portion extended from the stator core to an inside, and a teeth shoe extended from an inner end of the teeth portion in a circumferential direction; a coil disposed on the teeth portion; an inner stator disposed in the outer stator and configured to reciprocate in an axial direction due to an electromagnetic interaction with the coil; and a magnet disposed on the teeth shoe and facing the inner stator. The stator core includes a plurality of core plates stacked in the axial direction. The magnet includes first and second magnets that are spaced from each other in the axial direction.

A power supply device for an internal combustion engine, using a generator driven by an internal combustion engine as a power source and supplying power to a first load that needs to be constantly driven to cause the internal combustion engine to operate and a second load that is permitted not to drive during startup of the engine, wherein a first generation coil for driving the first load and a second generation coil for driving the second load are provided to be magnetically-coupled tightly in the generator, and voltage supplied to a load is boosted to a higher voltage value than conventionally achieved by performing chopper control of an energizing current of the first generation coil and an energizing current of the second generation coil while preventing energization from the second generation coil to a load.

An actuator according to one embodiment of the present invention may include a fixed member and a free member. The free member is operatively engaged with the fixed member so that the free member is moveable with respect to the fixed member. The actuator also includes means for moving the free member with respect to the fixed member. An elastic element operatively associated with the free member and the fixed member is operable to store energy without a change in an overall length of the actuator.

A rotating electric machine includes a multi-phase coil, an armature core, a rotor, a yoke core and a superimposer. The armature core has the multi-phase coil wound thereon. The rotor is rotatably disposed and has a plurality of magnetic poles facing the armature core. The yoke core is arranged so as to surround outer peripheries of the multi-phase coil and the armature core. The yoke core is magnetically connected with the magnetic poles of the rotor. The superimposer superimposes a DC component on a multi-phase alternating current supplied to the multi-phase coil, thereby supplying a DC field magnetic flux to a magnetic circuit that is formed by the armature core, the magnetic poles of the rotor and the yoke core.

An electric motor assembly comprising a stator having a first radially extending stator pole section, a rotor having a first rotor pole section extending radially from a rotor shaft and a second rotor pole section extending radially from the rotor shaft and spaced axially from the first rotor pole section, the first stator pole section disposed axially between the first and second rotor pole sections and radially overlapping both the first and second rotor pole sections, the stator comprising windings operatively configured to be selectively energized to provide a flux path across a first axial air gap between the first rotor pole section and the first stator pole section, and the first rotor pole section comprising a plurality of radially extending solid unitary pole pieces spaced circumferentially about the central axis of the rotor.

A salient pole type hybrid excitation motor, belonging to the field of motors, and including a rotor assembly, where the rotor assembly includes: an electromagnetic rotor with radial salient poles and constructed in an annular shape and sleeving a magnetic yoke; a permanent magnet rotor installed on one side of the electromagnetic rotor; and axial salient pole blocks installed on one side of the permanent magnet rotor away from the electromagnetic rotor and arranged alternately with the radial salient poles, a plurality of axial salient pole blocks being matched with a plurality of radial salient poles of the electromagnetic rotor, and a polarity of the permanent magnet steels corresponding to the axial salient pole blocks being opposite to that of permanent magnet steels corresponding to the radial salient poles of the electromagnetic rotor. The present invention combines electric excitation and permanent magnet excitation to adjust an air gap magnetic field of a motor.