Patent ID: 8531146
Filing Date: 2013-09-10
Classification: H02P,H03K

Abstract:
1. A robot, comprising: an electric motor having a permanent magnet and a coil; a semiconductor device having a drive control circuit, the drive control circuit generating a drive signal for driving the electric motor; and a driven member which is driven by the electric motor, wherein the drive control circuit generates the drive signal based on a positional signal which indicates relative position of a first drive member and a second drive member of the electric motor, a signal level of the drive signal becomes a first voltage level in a first interval, a signal level of the drive signal becomes a second voltage level which is different from the first voltage level in a second interval, the coil of the electric motor is not provided with a current in the first interval, and a length of the second interval is shorter than a length of an interval between a point at which a signal level of a timing signal based on the positional signal becomes a fourth voltage level from a third voltage level and a point at which the signal level of the timing signal becomes the third voltage level.