| 摘要 |
PURPOSE:To take out a signal having high frequency, by making a pitch of a coil piece of a comb-tooth-shaped coil into 1/N times (N is an integer other than 1) pitch of a magnetic pole of a rotary magnet in a speed detector used a whole circumference integral type frequency dynamo. CONSTITUTION:Printed circuit of a comb-tooth-shaped coil K is formed on a print substrate 6b and coil pieces K1-K36 are formed by e.g. 1/3 pitch of a pole pitch (180 deg. electric angle) of a magnetic pole for speed detection 2b of a magnet 2. Accordingly, the tertiary higher harmonic included in a magnetic flux distribution waveform of the magnet corresponds to the coil piece in the same pitch because three coil pieces correspond to one piece of the pole 2b. Consequently, an output added the electromotive force which is induced in each coil piece, is taken out from an output terminal Kout. This output can be made higher frequency than conventional frequency corresponding to a fundamental wave. Also, the pitch corresponding to a higher harmonic can be specified. |
