| 摘要 |
A beverage or foodstuff preparation machine (4) comprising: a component processing unit (14) operable to prepare a beverage or foodstuff from a beverage or foodstuff component, said component processing unit comprising a pump (22) arranged to deliver fluid to said component; a control system (16) configured to control a waveform of electrical energy supplied to the pump (22), wherein said control comprises during a start-up phase chopping a portion of a period of a repeating unit of said waveform, whereby the portion chopped varies between a start and an end of the start-up phase in a non-linear manner with respect to time and with a greater rate change proximate said end than proximate said start. |
