CONTROLLING TORSIONAL SHAFT OSCILLATION
First Claim
Patent Images
1. A system for minimizing torsional oscillation of a shaft, said system comprising:
- a converter for providing a drive signal in response to receiving power;
a motor for providing torque to the shaft in response to the drive signal provided by the converter;
a sensor for sensing a torsional strain of the shaft;
a regulator for producing a compensation signal as a function of the torsional strain; and
an excitation circuit for providing power to the converter as a function of the compensation signal.
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Abstract
Torsional oscillation of a shaft in a swing drive system of an excavator is minimized by monitoring torsional strain of the shaft. An electric motor provides torque to the shaft in response to a drive signal provided by a converter. A compensation circuit produces a compensation signal as a function of torsional strain of the shaft. A field excitation circuit or regulator powers a converter as a function of the compensation signal such that a counter torque is provided to the shaft and torsional oscillation of the shaft is reduced.
16 Citations
25 Claims
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1. A system for minimizing torsional oscillation of a shaft, said system comprising:
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a converter for providing a drive signal in response to receiving power; a motor for providing torque to the shaft in response to the drive signal provided by the converter; a sensor for sensing a torsional strain of the shaft; a regulator for producing a compensation signal as a function of the torsional strain; and an excitation circuit for providing power to the converter as a function of the compensation signal. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11)
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12. A method of minimizing torsional oscillation of a shaft, said method comprising:
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generating a drive signal in a converter in response to receiving power at the converter; providing torque from a motor to the shaft in response to the drive signal driving the motor; sensing a torsional strain of the shaft; producing a compensation signal as a function of the sensed torsional strain; and providing power to the converter as a function of the compensation signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of modifying a excavator swing drive system comprising:
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connecting an armature of a converter of the swing drive system to exactly one drive motor; connecting a forward field winding and a reverse field winding of the converter in parallel to form a single separately excited field; monitoring a torsional strain of a shaft driven by the exactly one drive motor; and regulating the separately excited field of the converter as a function of the monitored torsional strain such that torsional oscillation of the shaft is attenuated. - View Dependent Claims (22, 23, 24, 25)
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Specification