§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0085285A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Compressor drive system

Assignee: Institut Cerac SA
•
Filing: 1982-12-01
•
Granted: —
•
Expires: 2002-12-01
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A compressor drive system for controlling the gas pressure in a pressure gas volume (106) connected to the compressor (101). A brushless alternating current motor (23) is directly coupled to the compressor, which is driven with the same speed as the motor. The pressure in the gas volume (106) is sensed by pressure sensing means (109) connected to a converter (114). The converter simultaneously changes the amplitude and frequency of the drive voltage supplied to the motor (23). This is done in response to pressure changes in volume (106). The motor is stopped if the pressure exceeds a preset maximum value. A pressure gas container (104) is depressurized at motor stop to allow restarting without counter pressure on the compressor. Means (44) for controlling the amplitude and frequency of the drive voltage is provided so that the normal speed maximum load current is never exceeded during motor start.

Inventors

  • 👤 Carl Sverker Magnusson Hartwig
  • 👤 Ludovicus Jacobus Van Nederkassel

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 19:33
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/08; F; F04; F04C; F04C28/00; F04C28/08; F04C28/28; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2066; G05D16/208; F04C18/00; F04C18/08; F04C18/12; F04C18/14; F04C18/16; H02P27/047

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 128 words
A compressor drive system for controlling the gas pressure in a pressure gas volume (106) connected to the compressor comprising a compressor (101), a brushless alternating current motor (23) for driving the compressor, and pressure sensing means (109) connected to said gas volume for sensing the gas pressure therein, characterized thereby that the compressor (101) is directly coupled to the motor (23) to be driven with the same speed as the motor , a converter (114) for supplying the motor with a drive voltage of variable amplitude and frequency, and said pressure sensing means (109) being connected to the converter to simultaneously change the amplitude and frequency of said drive voltage in a direction opposite to the direction of change of the pressure in said gas volume (106).
Claim 2
Dependent Claim 128 words
A compressor drive system for controlling the gas pressure in a pressure gas volume (106) connected to the compressor comprising a compressor (101), a brushless alternating current motor (23) for driving the compressor, and pressure sensing means (109) connected to said gas volume for sensing the gas pressure therein, characterized thereby that the compressor (101) is directly coupled to the motor (23) to be driven with the same speed as the motor , a converter (114) for supplying the motor with a drive voltage of variable amplitude and frequency, and said pressure sensing means (109) being connected to the converter to simultaneously change the amplitude and frequency of said drive voltage in a direction opposite to the direction of change of the pressure in said gas volume (106).
Claim 3
Dependent Claim 47 words
A compressor drive system according to claim 1, characterized b y means (115) for sensing a preset maximum value of said gas pressure and for decreasing the amplitude and frequency of said drive voltage to zero when said maximum value is exceeded, thereby stopping the motor (23).
Claim 4
Dependent Claim 55 words
A compressor drive system according to claim 1 or 2, characterized by a pressure gas container (104) connected to the compressor (101) and a relief valve (108) connected to the container, said relief valve being controlled by the pressure at the compressor outlet so that the container is depressurized when the motor (23) is stopped.
Claim 5
Dependent Claim 44 words
A compressor drive system according to claim 1, 2 or 3 characterized b y means (44) for controlling the amplitude and frequency of the drive voltage so that the current at normal speed maximum load of the motor is never exceeded during motor start.

References Cited (Backward Citations)

DE1588283A1 Cited
US4177649A Cited
GB2022808A Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag