초록 ▼

A rotary electric machine has two sub-windings shifted by 30 degrees from each other. Each sub-winding is connected to an individual bridge which has MOS transistors on the ground sides. It is possible to supply a charging current even at a low rotational speed by switching the MOS transistors at a

A rotary electric machine has two sub-windings shifted by 30 degrees from each other. Each sub-winding is connected to an individual bridge which has MOS transistors on the ground sides. It is possible to supply a charging current even at a low rotational speed by switching the MOS transistors at a high-frequency. The basic components of magnetic force are canceled because of the shifted sub-windings. The switching components of the magnetic forces generated by the switching operation are canceled by switching two groups of the MOS transistors in opposite states. As a result, it is possible to decrease the magnetic noise significantly.

대표청구항 ▼

A rotary electric machine has two sub-windings shifted by 30 degrees from each other. Each sub-winding is connected to an individual bridge which has MOS transistors on the ground sides. It is possible to supply a charging current even at a low rotational speed by switching the MOS transistors at a

A rotary electric machine has two sub-windings shifted by 30 degrees from each other. Each sub-winding is connected to an individual bridge which has MOS transistors on the ground sides. It is possible to supply a charging current even at a low rotational speed by switching the MOS transistors at a high-frequency. The basic components of magnetic force are canceled because of the shifted sub-windings. The switching components of the magnetic forces generated by the switching operation are canceled by switching two groups of the MOS transistors in opposite states. As a result, it is possible to decrease the magnetic noise significantly. us according to claim 7 further including a calibration circuit connected to the combiner to provide compensating signals to accommodate various parameter changes. 9. Apparatus according to claim 1 wherein the power source includes an EMI filter and an energy storage device. 10. Apparatus according to claim 9 further including a secondary power supply connected to the energy storage device to supply a plurality of voltages. 11. Apparatus according to claim 1 wherein the first converter includes an optical isolation device that converts electrical signals referenced to the first ground to optical signals and then converts the optical signals to electrical signals referenced to the second ground. 12. Apparatus according to claim 1 wherein the second converter includes an anti-alias filter. 13. A compact motor driver circuit comprising: a filter, connected to receive power from a power bus to produce a filtered power signal; an energy storage circuit connected to the filter to receive the filtered power signal; a plurality of input circuits to receive motor commands signal; a selector circuit connected to the input circuits to receive the motor command signals and to produce a selected one; a first combiner circuit connected to receive the selected one and a feedback signal, which may contain undesirable components, to produce a combined signal; a compensator connected to the receive the combined signal, to remove the undesirable components from the feedback signal and to produce a desired signal; a pulse width modulator to receive the desired control signal and operable to produce an average voltage control signal an averager to receive the average voltage control signal and to produce a command signal; a motor circuit connected to receive the command signal and to produce a three phase motor control signal there from; a feedback connection from the motor circuit to the first combiner to supply the feedback signal thereto and a calibration circuit connected to the first combiner to provide compensating signals to accommodate various parameter changes. 14. Apparatus according to claim 13, wherein the calibration circuit comprises a look up table. 15. Apparatus according to claim 13 wherein a tachometer is connected to the motor circuit to produce the feedback signal for the first combiner. 16. Apparatus according to claim 15 further including a second combiner, connected between the compensator and the, pulse width modulator and a feed forward compensator connected between the second combiner and the first combiner for use during low speed operation when the feedback signal is insufficient to operate the system. 17. Apparatus according to claim 13 wherein the command signal is referenced to a first ground and the motor circuit is referenced to a second ground. 18. Apparatus according to claim 17 further including an isolation circuit connected to the motor circuit and to receive the command signal and operable to convert electrical signals referenced to the first ground to electrical signals referenced to the second ground.