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A rotor position determination device for determining a position of a rotor of a rotating electric machine relative to m-phase (m is an integer equal to or more than 2) armature coils, the rotating electric machine including a stator having the m-phase armature coils, and the rotor having a magnetic

A rotor position determination device for determining a position of a rotor of a rotating electric machine relative to m-phase (m is an integer equal to or more than 2) armature coils, the rotating electric machine including a stator having the m-phase armature coils, and the rotor having a magnetic field, includes: transient current energizing means for performing, for each of the m-phase armature coils, a transient current energizing process for temporarily applying a DC voltage to the armature coil of each phase of the rotating electric machine to pass a transient current through the armature coil of each phase; and rotor position determination means for detecting the transient current passed through each of the m-phase armature coils and determining the position of the rotor relative to the m-phase armature coils from the detected transient currents.

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What is claimed is: 1. A rotor position determination device of a rotating electric machine for determining a position of a rotor of the rotating electric machine relative to m-phase (m is an integer equal to or more than 2) armature coils, said rotating electric machine including a stator having t

What is claimed is: 1. A rotor position determination device of a rotating electric machine for determining a position of a rotor of the rotating electric machine relative to m-phase (m is an integer equal to or more than 2) armature coils, said rotating electric machine including a stator having the m-phase armature coils, and the rotor having a magnetic field, comprising: transient current energizing means for performing, for each of said m-phase armature coils, a transient current energizing process for temporarily applying a DC voltage to the armature coil of each phase of said stator to pass a transient current through the armature coil of each phase; and rotor position determination means for detecting the transient current passed through each of said m-phase armature coils in said transient current energizing process and determining the position of said rotor relative to said m-phase armature coils from the detected transient currents. 2. A rotor position determination device of a rotating electric machine for determining a position of a rotor of the rotating electric machine relative to m-phase (m is an integer equal to or more than 2) armature coils, said rotating electric machine including a stator having the m-phase armature coils star-connected so as to have a neutral point, and the rotor having a magnetic field, comprising: transient current energizing means for performing, for each of said m-phase armature coils, a process for temporarily applying a DC voltage between a non-neutral point side terminal of the armature coil of each phase of said stator and a grounded potential portion to pass a transient current through the armature coil of each phase; and rotor position determination means for detecting the transient current passed through each of said m-phase armature coils by said transient current energizing means and determining the position of said rotor relative to said m-phase armature coils from the detected transient currents. 3. The rotor position determination device of a rotating electric machine according to claim 1, wherein said rotor position determination means is comprised so as to determine the position of said rotor relative to said m-phase armature coils from peak values of said transient currents. 4. The rotor position determination device of a rotating electric machine according to claim 2, wherein said rotor position determination means is comprised so as to determine the position of said rotor relative to said m-phase armature coils from peak values of said transient currents. 5. The rotor position determination device of a rotating electric machine according to claim 1, wherein said rotor position determination means is comprised so as to determine the position of said rotor relative to said m-phase armature coils from peak values and waveforms of said transient currents. 6. The rotor position determination device of a rotating electric machine according to claim 2, wherein said rotor position determination means is comprised so as to determine the position of said rotor relative to said m-phase armature coils from peak values and waveforms of said transient currents. 7. A control device of a rotating electric machine for controlling supply of a drive current to m-phase (m is an integer equal to or more than 2) armature coils to operate as a motor said rotating electric machine including a stator having the m-phase armature coils star-connected so as to have a neutral point, and a rotor having a magnetic field, comprising: a signal generating device that detects an edge of a reluctor to generate a pulse signal when a rotational angle position of said rotor matches a predetermined position; a bridge-type inverter circuit having a DC terminal to which an output of DC power is applied and m number of AC terminals to which m number of non-neutral point side terminals of said m-phase armature coils are connected; a transient current energizing switch provided between a neutral point of said m-phase armature coils and a grounded potential portion; current detection means for detecting a current passing through said transient current energizing switch; and a controller for controlling said inverter circuit and said transient current energizing switch, wherein said controller comprises: transient current energizing means for controlling switch elements of said inverter circuit and said transient current energizing switch so as to perform, for each of said m-phase armature coils, a process for temporarily applying a DC voltage between a non-neutral point side terminal of the armature coil of each phase of said stator and the grounded potential portion to pass a transient current through the armature coil of each phase; first rotor position determination means for detecting the transient current passed through each of said m-phase armature coils by said transient current energizing means and determining the position of said rotor relative to said m-phase armature coils from the detected transient currents; first switch pattern deciding means for deciding as a switch pattern a combination of switch elements of said inverter circuit that need to be turned on in order to rotate said rotor in a predetermined direction based on the position of said rotor determined by said first rotor position determination means; first inverter control means for controlling said inverter circuit so as to turn on the switch elements of said inverter circuit according to the switch pattern decided by said first switch pattern deciding means; second rotor position determination means for determining the position of said rotor relative to the m-phase armature coils of said stator based on rotational angle information of said rotor obtained from a pulse signal generated by said signal generating device; second switch pattern deciding means for deciding as a switch pattern a combination of switch elements of said inverter circuit that need to be turned on in order to rotate said rotor in a predetermined direction based on the position determined by said second rotor position determination means; second inverter control means for controlling said inverter circuit so as to turn on the switch elements of said inverter circuit according to the switch pattern decided by said second switch pattern deciding means; and control switching means for switching control so that said inverter circuit is controlled by said first inverter control means at the start of said rotating electric machine, and after said signal generating device enters a state of generating a pulse signal having a level equal to or higher than a threshold, said inverter circuit is controlled by said second inverter control means. 8. The control device of a rotating electric machine according to claim 7, wherein said signal generating device is comprised so as to generate the pulse signal at a position where said switch pattern is switched.