Rotating electric machine system

A rotating electric machine system comprising a rotating electric machine and an electric power conversion circuit between which electric power is transferred,

• the rotating electric machine including a stator core, and N coils wound on the stator core and respectively belonging to N phases, where N is an integer greater than or equal to 2, the coils being electrically connected with each other to define a neutral point therebetween,
• the electric power conversion circuit comprising N high-side switches, N low-side switches, a selector switch, a full-wave driver, a half-wave driver and a drive controller,
• the N high-side switches respectively corresponding to the N coils and each having a high potential-side terminal and a low potential-side terminal, all the high potential-side terminals of the high-side switches being electrically connected to a positive terminal of a DC power source,
• the N low-side switches respectively corresponding to the N coils and each having a high potential-side terminal and a low potential-side terminal, all the low potential-side terminals of the low-side switches being electrically connected to a negative terminal of the DC power source,
• the high-side switches being either configured as permanently-connected switches with the low-side switches configured as selectively-connected switches or configured as selectively-connected switches with the low-side switches configured as permanently-connected switches, each of the permanently-connected switches being permanently electrically connected with a corresponding one of the coils of the rotating electric machine, each of the selectively-connected switches being selectively electrically connected with either a corresponding one of the permanently-connected switches or the neutral point between the coils,
• for each of the permanently-connected switches, that one of the high potential-side and low potential-side terminals of the permanently-connected switch which is electrically connected with neither the positive terminal nor the negative terminal of the DC power source constituting a permanently-connected terminal,
• each of the permanently-connected terminals of the permanently-connected switches being permanently electrically connected with a corresponding one of non-neutral point-side ends of the coils of the rotating electric machine,
• for each of the selectively-connected switches, that one of the high potential-side and low potential-side terminals of the selectively-connected switch which is electrically connected with neither the positive terminal nor the negative terminal of the DC power source constituting a selectively-connected terminal,
• the selector switch selectively electrically connecting each of the selectively-connected terminals of the selectively-connected switches to either a corresponding one of the permanently-connected terminals of the permanently-connected switches or the neutral point between the coils,
• the full-wave driver being configured to perform a full-wave drive process for full-wave driving the rotating electric machine, wherein in the full-wave drive process, the full-wave driver controls on-off switching of the permanently-connected switches and the selectively-connected switches with the selectively-connected terminals of the selectively-connected switches electrically connected with the corresponding permanently-connected terminals of the permanently-connected switches by the selector switch,
• the half-wave driver being configured to perform a half-wave drive process for half-wave driving the rotating electric machine, wherein in the half-wave drive process, the half-wave driver controls the on-off switching of the permanently-connected switches with the selectively-connected terminals of the selectively-connected switches electrically connected with the neutral point by the selector switch and with the selectively-connected switches kept on, and
• the drive controller being configured to control both the full-wave driver and the half-wave driver to selectively cause either the full-wave driver to perform the full-wave drive process or the half-wave driver to perform the half-wave drive process.