Rotational speed indicating apparatus

Details Rotational speed indicating apparatus Rotational speed indicating apparatus

1978-03-28

1980-05-13

Smith, Jr., David

Electricity: motive power systems

With signals, meters, recorders or testing devices

318314, 318318, H02P 728

Patent

active

042030617

ABSTRACT:
In a motor-driving system, the motor speed is controlled by a feedback signal derived from the difference in frequency and phase between a manually adjustable variable frequency and a rotational speed indicating signal. Frequency deviation of the manually adjustable frequency from a standard frequency is detected to energize a visual indicating device to indicate the magnitude of the frequency deviation and hence the motor speed deviation from a setting level. The direction of the frequency deviation is detected to indicate whether the motor speed deviation is above or below the setting level. The variable frequency is manually adjusted to vary the motor speed by noting the visual indication until null indication is obtained.

REFERENCES:
patent: 3268788 (1966-08-01), Branco
patent: 3295039 (1966-12-01), MacDonald et al.
patent: 3458823 (1969-07-01), Nordahl
patent: 3982190 (1976-09-01), Schaefer
Connelly et al., "Phase-Locked Loop Includes Lock Indicator", Electronics, Sep. 5, 1974, pp. 112, 113.

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