Chainsaw

A chainsaw, comprising:

• a housing;
• an electric motor supported by the housing;
• a chain driven by the electric motor to perform cutting;
• a guide plate for supporting and guiding the chain;
• and
• a control circuit comprising an inverter circuit having a plurality of switching elements and a controller configured to switch conduction states of the plurality of switching elements in the inverter circuit to control operation of the electric motor;
• wherein the controller outputs a braking control signal in response to a braking instruction to control a state of the inverter circuit so that the chainsaw is braked within 120 ms, and a maximum value of an operating chain speed of the chain is greater than or equal to 16 m/s.

A chainsaw, comprising:

• a housing;
• an electric motor supported by the housing;
• a battery pack for supplying power to at least the electric motor;
• a chain driven by the electric motor to perform cutting;
• a guide plate for supporting and guiding the chain;
• and
• a control circuit comprising an inverter circuit having a plurality of switching elements and a controller configured to switch conduction states of the plurality of switching elements in the inverter circuit to control operation of the electric motor;
• wherein the control circuit outputs a braking control signal in response to a braking instruction to control a state of the inverter circuit so that the chainsaw is braked within 120 ms;
• and a ratio of a maximum value of a bus voltage of the electric motor during braking to a rated voltage of the battery pack is less than or equal to 1.65, and/or a ratio of a maximum value of a bus voltage of the electric motor during braking to a nominal voltage of the battery pack is less than or equal to 1.5.