A structure of a rotor changeable of a magnetic force is provided, which includes a rotor core and a plurality of magnetic pole parts disposed therein. Each magnetic pole part includes a radially-magnetized fixed magnetic-force magnet and a circumferentially-magnetized variable magnetic-force magnet. A cavity part is disposed between the fixed magnetic-force magnet and the variable magnetic-force magnet. The cavity part has a cross-section extending from an end part of the fixed magnetic-force magnet toward an opposing surface. The cavity part is formed so that a distance between the variable magnetic-force magnet and the cavity part in the circumferential direction becomes larger as the cavity part approaches the opposing surface, and a width of the cavity part in the circumferential direction becomes smaller as the cavity part separates from the fixed magnetic-force magnet in the radial direction.

The permanent magnet machine includes a stator, a rotor inside the stator and a ferromagnetic component fixed axially movably to the rotor. The ferromagnetic component is configured for actuating axially toward the rotor to weaken a magnetic field of the rotor. The method of constructing a permanent magnet machine includes providing a stator and a rotor inside the stator; and axially movably fixing a ferromagnetic component to the rotor such that the ferromagnetic component is configured for actuating axially toward the rotor to weaken a magnetic field of the rotor.

An electrical machine has a stator with windings, first and second rotors, and an electrical output regulator. The first rotor carries alternating polarity first field magnets, such that, on drive mechanism rotation, the windings interact with the magnetic flux produced by the first magnets to create an EMF. The second rotor carries alternating polarity second field magnets, and has first and second rotational positions to reduce and increase, respectively, the magnetic flux energy. The electrical output regulator regulates a current from the windings to produce a torque on the rotors, as the drive mechanism increases from zero rotational speed, the torque rises above a threshold level that moves the second rotor from the first to the second rotational position, and, as the drive mechanism further increases the rotational speed, the torque peaks and then drops below the threshold level to move the second rotor back to the first rotational position.

The present disclosure provides a method and a device for controlling a power factor on motor side and a system having the same, and the method includes: controlling the motor using a control approach of Id=0 so as to obtain quadrature-axis voltage Uq and direct-axis voltage Ud in a virtual coordinate system of a current control cycle; calculating a first control value according to Uq and Ud; obtaining a power factor control target value, and calculating a target control value according to the power factor control target value; performing a PI control on a difference between the target control value and the first control value so as to obtain a coordinate deviation angle, and overlapping the coordinate deviation angle to a motor angle of the current control cycle so as to build a virtual coordinate system of a next control cycle, such that the power factor on the motor side is controllable.

There are presented various embodiments disclosed in this application, including methods and systems of arranging permanent magnets to switch from a first configuration designed for a first torque output to a second configuration designed for a second torque output.

A drive system, mountable onto a vehicle including a detachable rotational drive mechanism, for driving the rotational drive mechanism in accordance with a torque requirement. The drive system includes an engine that outputs first rotational power, and a generator that includes a rotor for receiving the first rotational power, a stator including a stator core with a winding wound thereon, a magnetic circuit for the winding passing through the stator core, and a supply current adjustment device for adjusting magnetic resistance of the magnetic circuit for the winding, to thereby change an inductance of the winding to adjust an output current of the generator. The drive system further includes a motor driven by the outputted current of the generator to output second rotational power to the rotational drive mechanism, and a control device configured to control both the engine and the supply current adjustment device, in accordance with the torque requirement.

A method and apparatus for reducing electromagnetic drag in an electric machine may include a laminated stator having wire slots disposed around the inner periphery spaced into sectors separated by a pole iron support structure. The slots contain induction windings. A series of wound lateral pole irons may be arranged around the inner periphery of the stator, the first ends of which extend into the slots in the sectors. A support structure supports the lateral pole irons by forming a circular opening concentric with the inner periphery of the stator, A rotor may be inserted into the circular opening of the lateral pole iron support structure and supported at the stator lateral pole iron ends by a support means. A plurality of rotor inserts may contain free-wheeling permanent magnet inserts spaced along an outer periphery of the rotor. The rotor may be inserted into the circular opening of the lateral pole iron support structure and the free-wheeling permanent magnet inserts may be inserted into cavities along the outer periphery of the rotor.

The present disclosure provides a method and a device for controlling a power factor on motor side and a system having the same, and the method includes: controlling the motor using a control approach of Id=0 so as to obtain quadrature-axis voltage Uq and direct-axis voltage Ud in a virtual coordinate system of a current control cycle; calculating a first control value according to Uq and Ud; obtaining a power factor control target value, and calculating a target control value according to the power factor control target value; performing a PI control on a difference between the target control value and the first control value so as to obtain a coordinate deviation angle, and overlapping the coordinate deviation angle to a motor angle of the current control cycle so as to build a virtual coordinate system of a next control cycle, such that the power factor on the motor side is controllable.

An axial flux permanent magnet machine including a pair of axially spaced first components. A second component positioned axially between and equidistant from the first components. Either the pair of first components or the second component is arranged to rotate about a shaft. A translation mechanism coupled to each of the first components. The translation mechanism configured to translate the first components axially away from the second component. Also a method of controlling an axial flux permanent magnet machine.

An example electrical machine is described that includes active segments for variable voltage generation. The electrical machine includes a drive shaft, a fixed rotor segment, an active rotor segment, and an actuator mechanism. The fixed rotor segment is coupled to the drive shaft, where the fixed rotor segment has affixed thereon first permanent magnets of alternating polarity. The active rotor segment axially is adjacent to the fixed rotor segment along the drive shaft. The active rotor segment also has affixed thereon second permanent magnets of alternating polarity. The actuator mechanism is configured to articulate the active rotor segment relative to the fixed rotor segment and thereby alter a phase of the second permanent magnets relative to the first permanent magnets in order to change a first voltage generated by the electrical machine to a second voltage generated by the electrical machine.