Control method for braking an electric motor, control method for controlling an electric drive unit and computer program product

• Main Authors: WISSMACH, Walter, ZHANG, Xiaodong, AUGUSTIN, Christian
• Format: Patent
• Language: English
• Published: 27.06.2024
• Subjects: COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; HAND TOOLS; MANIPULATORS; PERFORMING OPERATIONS; PORTABLE POWER-DRIVEN TOOLS; TRANSPORTING

Control method for braking an electric motor (7) of an electric handheld power tool (1), the electric motor (7) including a stator winding (12) and a rotor winding (14), wherein the method includes a) switching (S1) the electric motor (7) from motor operation to braking operation, b) reversing the polarity (S2) of an input voltage applied to the rotor winding (14) compared to motor operation, c) limiting (S3) a rotor current (IR(t)) of the rotor winding (14) as a function of a predetermined threshold value (IL), and d) regulating (S4) a stator current (IS(t)) of the stator winding (12) as a function of a current rotation speed (n(t)) of the electric motor (7).