Abstract: A belt driving apparatus includes a driving pulley r a driven pulley and an endless toothed belt. Each of the driving pulley and the driven pulley includes an outer circumference surface provided with a plurality of teeth. The toothed belt, wound around the driving pulley and the first driven pulley, includes an inner surface provided with a plurality of teeth arranged to mesh with the teeth of the driving pulley and the first driven pulley. The belt driving apparatus also includes an idler pulley having a belt contact surface coming into contact with the outer surface of the toothed belt. As viewed along the width direction of the belt contact surface, the idler pulley includes a center portion and two end portions sandwiching the center portion. The center portion of the idler pulley is greater in diameter than each of the two end portions.

Abstract: An operating device is provided with an operating section, in which a plurality of operating keys for operating a control target is laid out, and a display section, in which a screen corresponding to an input of the operating keys is to be displayed. The operating section does not have names of the operating keys printed thereon. The operating device or a controller has a storage means that stores guide information that guides the names of the operating keys. The names and an image of the operating keys corresponding to a selected language are displayed on the display section in accordance with a predetermined operation.

Abstract: A power supply device that is applicable to both 200 V and 400 V series input power by switching the operation of an auxiliary switching circuit with a switching switch. When a relatively large output is requested, PWM control is performed to adjust the on pulse width of a control pulse signal provided to switching elements of an inverter circuit and an auxiliary switching circuit, which is operated in cooperation with the inverter circuit. When a relatively small output is requested, PSM control is performed to adjusting a phase difference of two control pulse signals provided to the same set of switching elements in the inverter circuit.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j? 0 ) + F ? ( s - j? 0 ) 2 F ? ( s + j? 0 ) - F ? ( s - j? 0 ) 2 ? j - F ? ( s + j? 0 ) - F ? ( s - j? 0 ) 2 ? j F ? ( s + j? 0 ) + F ? ( s - j? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.