Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-08-26
2000-11-14
Wu, Daniel J.
Communications: electrical
Condition responsive indicating system
Specific condition
340635, 340641, 318434, G08B 2100
Patent
active
061476153
ABSTRACT:
A speed detecting device is adapted for use with a direct current motor, and includes a coupling circuit adapted to be connected electrically to a power input line of the motor, a one-shot circuit, a converter circuit, a comparator, and an alarm device. The one-shot circuit is triggered by a current-coupled pulse output, which is generated by the coupling circuit and which corresponds to current flowing through the power input line, and generates a pulse train signal in a form of a series of constant-width pulses, where spacing between adjacent ones of the constant-width pulses varies according to instantaneous operating speed of the motor. The converter circuit receives the pulse train signal, and generates a test signal having a magnitude that varies in accordance with the spacing between the adjacent ones of the constant-width pulses to provide an indication of a detected average operating speed of the motor. The comparator receives and compares the test signal with a predetermined reference signal that corresponds to a preset minimum operating speed of the motor, and generates an alarm activating signal when the test signal is less than the reference signal. The alarm device generates an alarm output upon receiving the alarm activating signal.
REFERENCES:
patent: 4275342 (1981-06-01), Kawada et al.
patent: 5880678 (1999-03-01), Yu
patent: 5889469 (1999-03-01), Mykytiuk et al.
patent: 6060879 (2000-05-01), Mussenden
Perfect Three Manufacturing Co.
Wu Daniel J.
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