Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1988-01-25
1990-03-13
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 15, 318114, 318128, G01D 1500, H02K 524
Patent
active
049085360
ABSTRACT:
The electrical termination impedance of a variable reluctance electro-mechanical transducer is changed automatically in response to the frequency of vibration applied to the transducer, to provide the optimum electrical termination impedance which produces the highest effective mechanical impedance at said frequency. The transducer includes magnetic cores interconnected by a spring formed by cutting a relatively thin medial annulus in a relatively thick flat disk. A digital logic circuit uses a signal counter and NAND gates to determine the frequency and close the appropriate fast-acting relay in a parallel array of capacitor-relays. A negative-impedance electrical termination provides a high mechanical impedance over a broad band of frequencies. A shunting circuit eliminates spurious resonances by providing substantially no shunting in the transducer-terminating circuit at resonant frequency, and substantial shunting in the terminating circuit at other frequencies.
REFERENCES:
patent: 4083433 (1978-04-01), Geohegan et al.
patent: 4595166 (1986-06-01), Kurokawa
patent: 4713939 (1987-12-01), Keith
patent: 4816725 (1989-03-01), Hudimac
Creighton Wray James
Rebsch D. L.
Salce Patrick R.
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