Rotating electrical machine
View Patent ↗A rotating electric machine and a method of magnetizing a rotor of a brushless rotating electric machine are disclosed, the method including forming a stationary magnetic field, rotating a rotor of a magnetizing machine in the stationary magnetic field for producing alternating current, rectifying the alternating current with a controllable bridge situated in the rotor, receiving control instructions wirelessly to the rotor, controlling a magnitude of current with the controllable bridge based on the control instructions, and feeding the controlled current to the magnetizing winding of the rotating electric machine.
1. A rotating electric machine with brushless excitation, comprising:
a main electric machine;
an excitation machine whose rotor is configured to rotate with a rotor of the main electric machine and produce magnetizing power for the main electric machine;
a rotating rectifier bridge electrically connected to the excitation machine for feeding a field magnetization current (I R ) to a rotor winding of the main electric machine, the rotating rectifier bridge being a controlled rectifier bridge having controllable semiconductor components for controlling the field magnetization current (I R );
a rotor control unit connected to the rotating rectifier bridge and being configured to control controllable semiconductor components, wherein the rotor control unit is configured to receive control instructions wirelessly; and
a controllable circuit adapted to lower the magnetization of the rotor winding of the main electric machine, wherein the controllable circuit comprises:
a series connection of a diode and a resistor connected in parallel with a rotor winding of the main electric machine; and
a controllable semiconductor component connected in parallel with the series connection, the rotor control unit being configured to control the controllable semiconductor component.
2. A rotating electric machine according to claim 1 , wherein the excitation machine comprises:
rotating windings adapted to be rotated in a stationary magnetic field for producing the magnetizing power to the main electric machine.
3. A rotating electric machine according to claim 2 , wherein the stationary magnetic field is produced by permanent magnets.
4. A rotating electric machine according to claim 2 , wherein the stationary magnetic field is produced with coils magnetized with DC current.
5. A rotating electric machine according to claim 1 , wherein the rotor control unit is configured to both send and receive wireless transmissions.
6. A rotating electric machine according to claim 1 , wherein the rotor control unit is configured to measure one or more quantities of a rotor circuit, the quantities including voltage of a field magnetization winding, field magnetization current, and various temperatures.
7. A rotating electric machine according to claim 6 , wherein the rotor control unit is configured to transmit wirelessly one or more of the measured quantities to an automatic voltage regulator.
8. A rotating electric machine according to claim 4 , comprising:
a controllable circuit adapted to lower the magnetization of the rotor winding of the main electric machine.
9. A rotating electric machine according to claim 3 , wherein the rotor control unit is configured to both send and receive wireless transmissions.
10. A rotating electric machine according to claim 8 , wherein the rotor control unit is configured to both send and receive wireless transmissions.
11. A rotating electric machine according to claim 9 , wherein the rotor control unit is configured to measure one or more quantities of a rotor circuit, the quantities including voltage of a field magnetization winding, field magnetization current, and various temperatures.
12. A rotating electric machine according to claim 10 , wherein the rotor control unit is configured to measure one or more quantities of a rotor circuit, the quantities including voltage of a field magnetization winding, field magnetization current, and various temperatures.