JPS54119212A - Rotating phase detecting circuit - Google Patents

Abstract

PURPOSE: To make circuit integration easy by operating an FF circuit with the respective signals comprising making the rotating phase detection signals to positive and negative alternate pulse train signals then separating these to the in-phase signals and delaying these signals.

CONSTITUTION: The rotating phases of a motor 1 to which a head cylinder 2 is directly coupled are detected by a head 4 which detects the signals S₁ of alternately different polarities. These signals are then made to the signals S₂ by an AC amplifier 5 and are then applied to pulse amplifiers 14, 15 of positive and negative directions, where their peaks are detected. Next, the addition output signal S₃ thereof is applied to a Schimitt circuit 16 to be made to the signal S₄, which is next inverted in a monostable multi 17 and inversion circuit 18, and is further delayed at the respective time constants in a monostable multi 19. In this case, the signal S₄ is assumed to be the pulses of duty 50%. These signals are applied to an FF 20 which is set and reset at the leading edge of the output signals S₈, S₉ of each monostable multi, whereby the signal S₁₀ is obtained. This is compared with the signal from a reference signal generator 11 in a phase comparator 12 and a motor 1 is controlled by the error signal. Thereby, the circuit integration is realized with the simple circuits.

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