PURPOSE: To enable a motor to be controlled under a configuration by a method wherein a phase controlling terminal for each of motors is connected to each other and further connected to an output part of a phase control in a microcomputer and then a power source terminal of each of coils is connected to the output of a power source control in a microcomputer.
CONSTITUTION: A plurality of branched passages for use in supplying gas fuel to a plurality of burners are provided with gas volume adjusting valves driven by each of steppings motors 22. Each of the motors is controlled by a control circuit constituted by a micro-computer 51. The stepping motor 22 performs a uni-polar driving with two-phase energization under a combination of a winding 48 and a driving transistor 49, for example. Then, a power source terminal 50 is connected to an output 52 for the power source control of the microcomputer 51 constituting the control circuit. A phase controlling terminal 53 of each of the stepping motors 22 is connected to each other, thereafter connected to an output 54 for phase control of the microcomputer 51. With such an arrangement as above, it is possible to reduce cost by arranging a small-size circuit board through a reduction of the number of ports and by arranging a small-size power source circuit.
NISHIMOTO TOSHIYA
TABUCHI MITSUAKI
TOKYO SANYO ELECTRIC CO