Controller for compressor
AssigneeAtlas Copco Airpower, Naamloze Vennootschap
InventorsPieter Michel Mena Cools, Yogesh Avinash Krishnasing
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Abstract
A controller for a compressor, more specifically for a first electrical VSD motor configured to drive a compressor element, the controller including a housing in which is provided a rectifier, a DC link with a DC bus and two inverters connected to the same DC bus, a first inverter configured to control the first VSD motor driving the compressor element, and a second inverter configured to control a second VSD motor driving a fan configured to cool the compressor.
Claims15
A compressor comprising:
- a controller connected to a first Variable Speed Drive (VSD) motor for driving a compressor element of said compressor,
- wherein the controller is further connected to a second VSD motor for driving a cooling fan configured to cool said compressor,
- said controller comprising a housing for all elements protected from an outside environment in which is provided a rectifier, a Direct Current (DC) link with a DC bus and two inverters connected to the same DC bus, a first inverter configured to control a frequency and a voltage of the first VSD motor driving said compressor element, and a second inverter configured to control a frequency and a voltage of the second VSD motor driving the fan, wherein said control varies the speed of the second VSD motor,
- wherein the controller further comprises a voltage sensor positioned on the DC bus that measures a voltage of the first VSD motor and/or of the second VSD motor,
- wherein the controller is configured to stop the compressor when the measured voltage is equal to or higher than a predetermined voltage limit or when the measured voltage is equal to or lower than a predetermined minimum voltage,
- wherein a DC link capacitor is connected between the rectifier and the first and second inverters, and
- wherein the compressor is a compressed gas compressor comprising an inlet for receiving ambient air and a compressed gas outlet.
A controller adapted to be connected to a first Variable Speed Drive (VSD) motor for driving a compressor element of a compressor or for driving a vacuum pump, and said controller is further adapted to be connected to a second VSD motor for driving a cooling fan configured to cool said compressor or said vacuum pump,
- said controller comprising a housing for all elements protected from an outside environment in which is provided a rectifier, a Direct Current (DC) link with a DC bus and two inverters connected to the same DC bus, a first inverter configured to control a frequency and a voltage of the first VSD motor driving, and a second inverter configured to control a frequency and a voltage of the second VSD motor, wherein said control varies the speed of the second VSD motor,
- wherein the controller further comprises a voltage sensor positioned on the DC bus that measures a first voltage of the first VSD motor and a second voltage of the second VSD motor,
- wherein the controller is configured to stop the compressor or vacuum pump when the measured voltage is equal to or higher than a predetermined voltage limit or when the measured voltage is equal to or lower than a predetermined minimum voltage,
- wherein a DC link capacitor is connected between the rectifier and the first and second inverters, and
- wherein the compressor is a compressed gas compressor comprising an inlet for receiving ambient air and a compressed gas outlet or the vacuum pump comprises an inlet for receiving ambient air.
Dependencies are inferred from the claim text.