Electric machine and method of using electric machine

An electric machine comprising:

• a rotational shaft;
• a rotor arranged coaxially with said shaft and having a plurality of salient poles which are substantially equally spaced with each other in the circumferential direction;
• an electric generation member which is arranged on said shaft and offset from said rotor in the axial direction and has an electric generation coil thereon, wherein said rotor has no permanent magnet;
• a stator stationarily arranged around said rotor and having a plurality of salient poles which are substantially equally spaced with each other and have thereon stator coils;
• and
• a sensor sending a signal indicating a state of charge of a battery, wherein said signal is used to determine required electricity generated from said electric machine;
• wherein:
• in sequentially supplying said stator coils with electricity for generating torque on said rotor, and in constantly supplying at least some of said stator coils with electricity to induce alternating magnetic flux on said electric generation coil when said rotor is rotated for generating electricity from said electric generation coil so as to charge said battery with said electricity from said electric generation coil, said electricity supplied to said stator coils is adjusted to adjust strength of the magnetic field on said rotor so as to be larger as said required electricity is larger and so as to be smaller as said required electricity is smaller.

A method of using an electric machine comprising:

• providing a sensor sending a signal indicating a state of charge of a battery, wherein said signal is used to determine required electricity generated from said electric machine;
• sequentially supplying electricity to stator coils on a plurality of salient poles of a stator arranged around a rotor having a plurality of salient poles to pull said rotor salient poles in the circumferential direction for generating torque on said rotor;
• rotating said rotor;
• generating a magnetic field on a magnetizing member which is arranged coaxially with said rotor and offset from said rotor in the axial direction, wherein said rotor has no permanent magnet;
• conducting the generated magnetic field to said salient poles of said rotating rotor to induce alternating magnetic flux;
• recovering electricity generated by the induced alternating magnetic flux from said stator coils so as to charge said battery;
• and
• adjusting strength of said magnetic field conducted from said magnetizing member to said rotor so as to be larger as said required electricity is larger and so as to be smaller as said required electricity is smaller, thereby adjusting amplitude of the magnetic flux induced on said stator coils to control output of the generated electricity.

A method of using an electric machine comprising:

• providing a sensor sending a signal indicating a state of charge of a battery, wherein said signal is used to determine a required electricity generated from said electric machine;
• sequentially supplying electricity to stator coils on a plurality of salient poles of a stator arranged around a rotor having a plurality of salient poles to pull said rotor salient poles in the circumferential direction for generating torque on said rotor;
• rotating said rotor;
• supplying electricity on said stator coils to generate a magnetic field on said salient poles of said stator;
• conducting the generated magnetic field to said salient poles of said rotating rotor to induce alternating magnetic flux passing through an electric generation coil arranged coaxially with said rotor, wherein said rotor has no permanent magnet;
• recovering electricity generated by the induced alternating magnetic flux from said electric generation coil so as to charge said battery;
• and
• adjusting electricity supplied to said stator coils, thereby adjusting a strength of the magnetic field so as to be larger as said required electricity is larger and so as to be smaller as said required electricity is smaller to control output of the generated electricity.