| 摘要 |
PURPOSE:To control reversible rotation a DC motor and also to enable reducing a development time and cost and having a controller for common use by applying a predetermined voltage through a resistance type potential divider, etc., in place of a position-transducing magneto-effect element to be used in a brushless motor and by changing this voltage. CONSTITUTION:The u(-)-, v(-)-and w(-)-terminals of an apparatus are divided in potential by resistances 3, 4 to be constantly biased to about 1/2Vcc. The u(+)-terminal is set to a voltage higher than 1/2Vcc by resistances 2, 1. Then, when Q1 is ON, R3 is in parallel with R6 and at a voltage lower than 1/2Vcc. This is a state where SW1 is on the a-side, i.e., Q1 is OFF and when SW1 is on the b-side, Q1 is ON. The voltages of the v(+)-and w(+)-terminals are determined in like manner and can be changed by SW1. Therefore, the control of reversible rotation of DCM is made possible by change-over of SW1. |
