Electric rotating machine for vehicle

1. A vehicle electric rotating machine that is driven by an electric power of a battery to start an engine at the time of start-up of said engine, as well as that is driven by the engine to generate an AC power after said engine has been started, said vehicle electric rotating machine comprising:

a power section in which there are provided plural sets of a pair of switching elements connected in series between positive and negative terminals of said battery, and diodes connected in parallel to said switching elements respectively, and in which a connection point of the switching elements connected in series is connected to a stator winding of said vehicle electric rotating machine; and

a control circuit section that controls said power section so that an electric power of said battery is supplied to said vehicle electric rotating machine to drive a rotor by ON/OFF control of said switching elements at the time of start-up of said engine, and an AC power, which is generated at said vehicle electric rotating machine, is rectified to a DC power with said switching element and diode group to charge said battery in a normal engine speed region of said engine at the time of power generation;

wherein with respect to flow of cooling air made by a centrifugal fan that is fixed to said rotor, there are separately located the control circuit section on the upstream side, and the power section on the downstream side; and the mentioned control circuit section is provided with a through hole so that the mentioned cooling air flows linearly through the mentioned power section.

2. The vehicle electric rotating machine according to claim 1 , wherein said power section is located separately from said control circuit section, and said switching elements and diodes are mounted on a heat sink also serving as an electrode member.

3. The vehicle electric rotating machine according to claim 2 , wherein said heat sink is divided with respect to each phase of a stator winding.

4. The vehicle electric rotating machine according to claim 1 , wherein said control circuit section is contained in a case to be sealed with an insulating resin.

5. The vehicle electric rotating machine according to claim 4 , wherein said case serves as a relay member providing an electrical and mechanical connection of said power section and said control circuit board.

6. The vehicle electric rotating machine according to claim 4 , wherein said case is further provided with a power generation part including a field current adjusting part that controls current to be supplied to a field winding of a rotor of,said vehicle electric rotating machine.

7. The vehicle electric rotating machine according to claim 4 , wherein a sensor core for detecting current is molded as an integral part in said case.

8. The vehicle electric rotating machine according to claim 4 , wherein a conductor terminal that provides a connection between intermediate connection points of the switching elements of said power section, and a lead wire from the stator is molded as an integral part in said case; and a junction thereof is sealed with the insulating resin along with said control circuit board.

9. The vehicle electric rotating machine according to claim 4 , wherein a connector for the connection to a battery power supply or an ECU is mounted onto said case.