SMALL ELECTRICAL APPLIANCE WITH IMPROVED MOTOR SPEED CONTROL

• Main Authors: KLEMM, Torsten, SCHMITT, Timo, Hermann, Ferdinand
• Format: Patent
• Language: English
• Published: 14.09.2023
• Subjects: APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CUTTING; DENTISTRY; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION; HAND CUTTING TOOLS; HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; PERFORMING OPERATIONS; SEVERING; TRANSPORTING

The present invention relates to the field of a small electrical appliance, in particular hair removal device or toothbrush, comprising an electric DC motor; a detector for acquiring a detector signal indicative of a rotational speed of the electric DC motor; and a controller for controlling the electric DC motor. The controller is adapted to: determine, based on the detector signal, a first parameter indicative of the rotational speed of the DC motor; determine, based on the detector signal, a second parameter indicative of the rotational speed of the DC motor, wherein the second parameter is different from the first parameter, and wherein the second parameter is determined based on a frequency domain analysis of the detector signal; and adjust a supply voltage of the electric DC motor based on the first parameter and the second parameter.