Danfoss Compressors Gmbh

Niels Pedersen

Rune Thomsen

Henrik Joergensen

Mads Andersen

A method and a control system for starting a motor (), in particular a motor () for driving a compressor. The rotational speed () of the motor () is measured and compared to a minimum value. In the case that &#x3c9;() is smaller than the minimum value after a predefined time interval has lapsed, the motor () is stopped, and the maximum current level to be supplied by the power source () is changed, preferably increased, before a new attempt to start the motor () is initiated. Preferably, the voltage () supplied to an electronic unit () is also measured, and in the case that it drops below a minimum voltage level, the motor () is stopped, and the maximum current level is changed, preferably decreased, before a new start attempt is initiated. It is possible to adjust the supplied current level in such a way that power is conserved while sufficient lubricated of the moving parts of the compressor is ensured.

Method and a control system for starting a motor for driving a compressor

A method for starting a battery driven motor, wherein an input voltage is measured continuously. In case the input voltage becomes smaller than a predefined minimum voltage the attempt to start the motor is stopped and the maximum permitted current level to be supplied from the battery to an electronic unit of the motor is lowered before the next attempt. This is repeated until the input voltage is larger than the minimum voltage and the motor is no longer in start-up mode. The method protects the battery from collapsing. The method is suitable for starting battery driven motors for driving compressors. The number of attempted start-up sequences may be counted and on the basis of this it may be determined that the battery is weak or that the wiring is misdimensioned. Furthermore, a control system for controlling starting of a motor.

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Soenderborg, Denmark

Niels Pedersen