Patent ID: 8829746
Filing Date: 2014-09-09
Classification: B62D,H02K,H02P

Abstract:
1. A controller for driving and controlling rotation of an electric motor comprising: a first current-supply circuit for supplying driving current to the electric motor via a first power line; a second current-supply circuit for supplying driving current to the electric motor via a second power supply line the electric motor being independently operated from the first current-supply circuit; a control board to which control terminals are connected, wherein control signals for controlling switching operations of switching elements included in the first and second current-supply circuits are inputted to the control terminals; an integrated circuit mounted to the control board and having a first pre-driver circuit for outputting the control signals to only the first current-supply circuit and a second pre-driver circuit for outputting the control signals to only the second current-supply circuit; and a micro-computer mounted to the control board on a center line of the control board for outputting operation signals for controlling outputs of the control signals of the first and second pre-driver circuits, wherein a distance between the center line and the first current-supply circuit and a distance between the center line and the second current-supply circuit is substantially equal to each other, wherein output terminals of the micro-computer for outputting the operation signals to the first pre-driver circuit and output terminals of the micro-computer for outputting the operation signals to the second pre-driver circuit are arranged so as to be symmetric with respect to the center line, wherein the integrated circuit has first and second input terminals, which are mounted to the control board so as to be symmetric with respect to the center line, wherein the operation signals are respectively transmitted from the micro-computer to the first and second input terminals via wiring patterns formed on the control board and then inputted into the first and second pre-driver circuits, wherein the integrated circuit has first and second output terminals, which are mounted to the control board so as to be symmetric with respect to the center line, wherein the control signals are respectively outputted from the first and second pre-driver circuits to the first and second current-supply circuits via wiring patterns formed on the control board; and wherein, due to the symmetric nature of the output terminals of the micro-computer, the symmetric nature of the first and second input terminals of the integrated circuit and the symmetric nature of the first and second output terminals of the integrated circuit, an impedance from the micro-computer to the first current-supply circuit and an impedance from the micro-computer to the second current-supply circuit are equivalent.