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US 12,071,944 B2Granted
Method and apparatus for vibration compensation in a piston compressor
AssigneeKnorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
InventorsThomas Merkel, Michael Hartl, Stefan Schneider
Life of this patent
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Abstract
The invention relates to a method and to an apparatus for vibration compensation in a piston compressor, the piston compressor of which is driven by means of a crankshaft by a three-phase motor controlled by a frequency converter, wherein the current position the crankshaft of the piston compressor is determined, and based on this the frequency converter, a torque (MM) for the three-phase motor is predetermined, which torque follows the load torque (ML) of the piston compressor in order to reduce the vibration stimulation of the entire piston compressor.
Claims6
A method for vibration compensation in a piston compressor, the method comprising:
- driving the piston compressor by a crankshaft of a three-phase motor controlled by a frequency converter, the piston compressor and three-phase motor coupled without intervening flywheel masses, the piston compressor having a resilient mounting;
- and
- determining the current position of the crankshaft of the piston compressor,
- wherein based on the determined current position of the crankshaft, a torque (MM) that follows a load moment (ML) of the piston compressor is prescribed by the frequency converter for the three-phase motor to reduce vibration excitation of the piston-type compressor as a whole,
- wherein the torque (MM) prescribed for the three-phase motor corresponds to the first order of a load moment profile of the piston compressor,
- wherein, to compensate for fluctuations in speed, the torque (MM) generated by the three-phase motor is produced by the frequency converter with an increased pulse width for a period of time, and
- wherein, to compensate for fluctuations in speed, a torque requirement to be adjusted according to rotational speed is stored in logic of a control unit implemented by the frequency converter,
- wherein the current angular position of the crankshaft of the piston compressor is determined by sensors and prescribed to the control unit by the sensors as a current crankshaft position, and
- wherein a deviation of the load moment (ML) of the piston compressor is set to only approximately follow the torque (MM) for the three-phase motor, wherein the deviation range is selected from a range of less than 30% and vibration behavior is improved by the vibration compensation by up to 70%.
6 more elements
An apparatus for vibration compensation in a piston compressor which is driven by a crankshaft by a three-phase motor controlled by a frequency converter, the apparatus comprising:
- a control unit that determines the current position of the crankshaft of the piston compressor,
- wherein, based on this, the frequency converter prescribes a torque (MM) that corresponds to the load moment (ML) of the piston compressor for the three-phase motor to reduce vibration excitation of the piston-type compressor as a whole,
- wherein the torque (MM) prescribed for the three-phase motor corresponds to the first order of a load moment profile of the piston compressor,
- wherein, to compensate for fluctuations in speed, the torque (MM) generated by the three-phase motor is produced by the frequency converter with an increased pulse width for a period of time, and
- wherein, to compensate for fluctuations in speed, a torque requirement to be adjusted according to rotational speed is stored in logic of the control unit implemented by the frequency converter,
- wherein the current angular position of the crankshaft of the piston compressor is determined by sensors and prescribed to the control unit by the sensors as a current crankshaft position, and
- wherein a deviation of the load moment (ML) of the piston compressor is set to only approximately follow the torque (MM) for the three-phase motor, wherein the deviation is selected from a range of less than 30% and vibration behavior is improved by the vibration compensation by up to 70%.
4 more elements
A piston compressor for producing compressed air for a vehicle, the compressor comprising:
- a piston compressor which is driven by a crankshaft by a three-phase motor controlled by a frequency converter;
- and
- an apparatus for vibration compensation in the piston compressor, the apparatus comprising a control unit that determines the current position of the crankshaft of the piston compressor,
- wherein, based on this, the frequency converter prescribes a torque (MM) that corresponds to the load moment (ML) of the piston compressor for the three-phase motor to reduce vibration excitation of the piston-type compressor as a whole,
- wherein the torque (MM) prescribed for the three-phase motor corresponds to the first order of a load moment profile of the piston compressor,
- wherein, to compensate for fluctuations in speed, the torque (MM) generated by the three-phase motor is produced by the frequency converter with an increased pulse width for a period of time, and
- wherein, to compensate for fluctuations in speed, a torque requirement to be adjusted according to rotational speed is stored in logic of a control unit implemented by the frequency converter,
- wherein the current angular position of the crankshaft of the piston compressor is determined by sensors and prescribed to the control unit by the sensors as a current crankshaft position, and
- wherein a deviation of the load moment (ML) of the piston compressor is set to only approximately follow the torque (MM) for the three-phase motor, wherein the deviation is selected from a range of less than 30% and vibration behavior is improved by the vibration compensation by up to 70%.
6 more elements
Dependencies are inferred from the claim text.