Electrical devices comprised of nanoscopic wires are described, along with methods of their manufacture and use. The second portion of the driven balance shaft is constructed to produce a moment of inertia less than a moment of inertia that is produced in the first portion of the drive balance shaft. If a malfunction with a servomotor is detected by the malfunction detecting unit, the malfunctioning servomotor is no longer subject to deceleration control, a deceleration pattern including a combination of normal servomotors is read from the deceleration pattern storage unit, and then braking control is performed by using this deceleration pattern.