Method for determining the time behavior of a cyclic motor process during use of an electrical hair removal device and hair removal device

• Main Authors: Neyer, Christian, Kraus, Bernhard
• Format: Patent
• Language: English
• Published: 13.04.2021
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CUTTING; ELECTRICITY; GENERATION; HAIRDRESSING OR SHAVING EQUIPMENT; HAND CUTTING TOOLS; HAND OR TRAVELLING ARTICLES; HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR; HUMAN NECESSITIES; MANICURING OR OTHER COSMETIC TREATMENT; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PERFORMING OPERATIONS; PHYSICS; SEVERING; TESTING; TRANSPORTING

Electrical hair removal device and method for determining the time behavior of a cyclic motor process during use of the electrical hair removal device with a motor-driven hair cutting unit by measuring the motor current. Parallel to measuring the motor current, the induced voltage of the motor is measured and a timing property of the induced voltage is evaluated, wherein the duration of a time pattern in the induced voltage is analyzed as timing property of the induced voltage. A cutting activity of the electrical hair removal device during use is determined based on the evaluated timing property of the induced voltage, and a force applied onto skin during use of the electrical hair removal device is determined based on the measured motor current and, optionally, on the determined cutting activity.