Systems and methods for restricting motor operation for wireless handheld knives

A power pack for a power tool, the power pack comprising:

• an electric motor configured for driving engagement with the power tool;
• a braking resistor;
• a relay circuit in electrical communication with the electric motor, the relay circuit comprising a switch selectively electrically connectable to the braking resistor, with the relay circuit being configured so that an electrical connection of the electric motor to the braking resistor permits electrical energy from the electric motor to be dissipated by the braking resistor at least partly in the form of heat;
• and
• non-transitory computer-readable storage media having computer-executable instructions for monitoring operation of the electric motor stored thereon, wherein when executed by at least one processor the computer-executable instructions cause the at least one processor to—
• monitor input data relating to operation of the electric motor, the input data comprising one or more of:
• output level of a power source, control signals to the power source, paired wireless communication signals received from the power tool, operation duration of the electric motor, and operation duty cycle of the electric motor;
• determine, based at least in part on the input data, that operation of the electric motor deviated from an ideal state,
• based on the determination of deviation, activate the relay circuit to electrically connect the electric motor to the braking resistor.