Electricity: motive power systems – Reciprocating or oscillating motor
Patent
1996-05-22
1997-12-30
Stephan, Steven L.
Electricity: motive power systems
Reciprocating or oscillating motor
73578, 318114, H02K 3300, G01M 700
Patent
active
057034460
ABSTRACT:
A method and apparatus for controlling the oscillatory motion of a test device by using amplitude and DC offset feedback for control purposes. The force applied to the test device is monitored by a load sensor and compared to a preset desired amplitude load setpoint to determine the positive peak amplitude of a sinusoidal control signal. The DC offset feedback is monitored by sampling the value of a displacement feedback signal a number of times for each cycle of movement. The values of the samples are averaged to determine a calculated DC offset. The calculated DC offset is compared to a desired DC offset, which is determined from a preset desired displacement setpoint. The difference between the calculated DC offset and the desired DC offset is then used to control the load applied to the test device to maintain the desired oscillatory movement.
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Caterpillar Inc.
Jones Judson H.
Stephan Steven L.
Yee James R.
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