Patent ID: 7009351

Claim:
A single phase motor driving unit comprising: a first driving transistor supplying a single phase coil with a driving electric current in a first direction; a second driving transistor supplying said single phase coil with a driving electric current in a direction opposite to the first direction; a comparison section which compares an intensity of a sine wave signal obtained from a Hall device detecting a rotational position of the single phase motor and a reference value, and which generates a timing signal in a predetermined period that starts immediately before and ends immediately after a point at which the direction of the driving electric current for said single phase coil changes; and a recirculating section which recirculates the driving electric current by controlling ON-OFF timings of said first driving transistor and said second driving transistor in said predetermined period in which said timing signal is generated such that, within a given period in which said first driving transistor and said second driving transistor on the side to which the driving electric current flows out from said single phase coil are ON, said first driving transistor and said second driving transistor on the side from which the driving electric current is supplied to said single phase coil each becomes ON for a period that is shorter than said given period.