Powering and controlling an electric brushless motor in a power tool with a dual mode motor control
AssigneeRobbox Inc.
InventorAndrei Matei
Life of this patent
Estimating the term…
Abstract
Powered hand tools with a dual mode motor control and, in particular, their combination with a laser measuring system and a touch interactive screen. The dual mode motor control comprises a first mode and a second mode, the first mode being sensored and the second mode being sensorless implementing a Field Oriented Control angle estimator. According to the disclosure, the laser measuring system is provided to operate functions of powered hand tools, and the touch interactive screen is provided to operate functions and control parameters of powered hand tools.
Claims20
A handheld power tool, comprising:
- a housing;
- a motor disposed within the housing, the motor including at least one sensor;
- a dual mode motor controller including a first mode and a second mode, the first mode being sensored and the second mode being sensorless;
- a chuck operatively-coupled to the motor;
- a display mounted on a rear surface of the housing, said display being positioned opposite the chuck;
- and
- processing circuitry disposed within the housing, the processing circuitry being configured to control the dual mode motor controller based on a signal received from the display, wherein the processing circuitry generates a first estimation of rotor angle using the first mode, rotates a rotor of the motor based on the first estimation of the rotor angle using the first mode, determines a current torque value of the motor based on the first estimation of the rotor angle using the first mode, generates a second estimation of rotor angle using the second mode when the current torque value of the motor matches a predetermined torque value of the motor, and rotates the rotor of the motor based on the second estimation of the rotor angle using the second mode.
A method for controlling a handheld power tool, the handheld power tool comprising a housing, a motor disposed within the housing, the motor including at least one sensor, a dual mode motor controller including a first mode and a second mode, the first mode being sensored and the second mode being sensorless, a chuck operatively-coupled to the motor, a display mounted on a rear surface of the handheld power tool, said display being positioned opposite the chuck, and processing circuitry disposed within the housing, the processing circuitry being configured to control the dual mode motor controller based on a signal received from the display, the method comprising:
- generating, via the processing circuitry, a first estimation of rotor angle using the first mode;
- rotating a rotor of the motor based on the first estimation of the rotor angle using the first mode;
- determining, via the processing circuitry, a current torque value of the motor based on the first estimation of the rotor angle using the first mode;
- generating, via the processing circuitry, a second estimation of rotor angle using the second mode when the current torque value of the motor matches a predetermined torque value of the motor;
- and
- rotating the rotor of the motor based on the second estimation of the rotor angle using the second mode.
A handheld power tool, comprising:
- a housing, a motor disposed within the housing, the motor including at least one sensor, a dual mode motor controller including a first mode and a second mode, the first mode being sensored and the second mode being sensorless, a chuck operatively-coupled to the motor, a display mounted on a rear surface of the housing, said display being positioned opposite the chuck, and processing circuitry disposed within the housing, the processing circuitry being configured to control the dual mode motor controller based on a signal received from the display, wherein the processing circuitry generates a first estimation of rotor angle using the first mode, rotates a rotor of the motor based on the first estimation of the rotor angle using the first mode, determines a current torque value of the motor based on the first estimation of the rotor angle using the first mode, generates a second estimation of rotor angle using the second mode when the current torque value of the motor matches a predetermined torque value of the motor, and rotates the rotor of the motor based on the second estimation of the rotor angle using the second mode.
Dependencies are inferred from the claim text.