| 摘要 |
PURPOSE: To give no discomfort to a user, at a resumption of an operation or a stoppage of the operation, by executing a stoppage of a driving means controlling a speed by changing a voltage duty ratio according to air conditioning load, through gradually decreasing, to almost zero, an output at a blower stoppage caused by other reason than an abnormality detection. CONSTITUTION: If an abnormality of a driving motor 31 or an indoor blower 30 is detected on a basis of a detected electric current flowing to a driving motor 31 from a DC-DC converter 17, the signal is inputted to an MPU 20. The MPU 20 compares a rotation detection signal from a rotation detection section 32 with a rotation order value receiving a separate setting according to an air conditioning load, and regulates so an output voltage of the DC-DC converter 17 through a control of a driving duty ratio as to make the difference zero. And, at a stoppage caused by other condition materialization than an emergency stoppage the driving duty ration is decreased with a speed, a dagree of which is such that rotation of the indoor blower 30 is not susceptible to a braking, and when it became lower than a duty ration wherein a driving of the blower can not be executed, a driving stoppage is executed. |
