Control device for permanent magnet motor serving as both engine starter and generator in motor vehicle

摘要

A control device for a permanent magnet motor (9) serving as both a starter for an engine (2) and a generator in a motor vehicle (1) is disclosed. The control device includes a drive circuit (12) converting a direct current to an alternating current to supply the alternating current to the permanent magnet motor (9), the drive circuit (12) having at least one arm including two series connected first switching elements (13U, 14U; 13V, 14V; 13W, 14W) having flywheel diodes (17U, 17V, 17W) respectively, the drive circuit (12) having an input terminal (18, 19) connected to a capacitor (23) and an output terminal (22U, 22V, 22W) connected to the permanent magnet motor (9), a chopper circuit (24) including a plurality of series connected second switching elements (25, 26) having diodes (27, 28) connected in parallel with the second switching elements (25, 26) respectively, the chopper circuit (24) being disposed at the battery (10) side and connected in parallel with the capacitor (23), a reactor (29) connected between a neutral point of the chopper circuit (24) and the battery (10), and a control (33) for controlling the switching elements (13U, 14U; 13V, 14V; 13W, 14W; 25; 26) of the drive circuit (12) and chopper circuit (24) so that the switching elements (13U, 14U; 13V, 14V; 13W, 14W; 25; 26) are turned on and off.