Power tool and control method therefor
AssigneeNanjing Chervon Industry Co., Ltd.
InventorsHong Zhu, Zhijian Lu
Life of this patent
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Abstract
A power tool includes a motor including a rotor and multi-phase stator windings; a driver circuit having multiple switch elements for outputting switch signals to drive the motor to rotate; and a controller electrically connected to at least the driver circuit and the motor. The controller is configured to acquire rotor position information of the motor and adjust a resultant magnetic potential of the motor according to the rotor position information such that an output electrical parameter of the motor corresponding to the resultant magnetic potential is within a preset parameter range.
Claims9
A power tool, comprising:
- a motor comprising a rotor and multi-phase stator windings;
- a driver circuit having a plurality of switch elements for outputting switch signals to drive the motor to rotate;
- and
- a controller electrically connected to at least the driver circuit and the motor,
- wherein the controller is configured to:
- acquire a rotor position information of the motor;
- and
- adjust a resultant magnetic potential of the motor according to the rotor position information such that an output electrical parameter of the motor corresponding to the resultant magnetic potential is within a preset parameter range, and
- wherein the controller is further configured to control the driver circuit to change conduction states to increase a stator magnetic potential when the rotor is at a first preset position and control the driver circuit to change the conduction states to decrease the stator magnetic potential when the rotor is at a second preset position.
A control method for a power tool, wherein the power tool comprises:
- a motor comprising a rotor and a plurality of stator windings;
- a driver circuit having a plurality of switch elements for outputting switch signals to drive the motor to rotate;
- and
- a controller electrically connected to at least the driver circuit and the motor;
- and
- the control method comprises:
- acquiring a rotor position information of the motor;
- adjusting a resultant magnetic potential of the motor according to the rotor position information such that an output electrical parameter of the motor corresponding to the resultant magnetic potential is within a preset parameter range, and
- controlling the driver circuit to change conduction states to increase a stator magnetic potential when the rotor is at a first preset position and control the driver circuit to change the conduction states to decrease the stator magnetic potential when the rotor is at a second preset position.
Dependencies are inferred from the claim text.