A PWM modulation circuit controls low-side transistors of three phases (u, v, and w) all to be into an ON state, when a brake current flows, controls, in a period in which a brake current flows in one phase, a transistor for sensing (u, v, and w) of this one phase to be into an ON state, and controls, in a period of two phases, the transistor for sensing (u, v, and w) of three phases to be into an OFF state. When the brake current is to flow, sense-phase control circuits of three phases controls a transistor for sensing (u, v, and w), in a phase in which the brake current is in a sink direction, to be into an ON state, and controls the transistor for sensing (u, v, and w) in a phase in which it is in an opposite direction, to be into an OFF state.