Power tool including closed loop speed control

A method of operating a power tool, the power tool including a driver blade extending along a driving axis and a cam assembly including a cam that is configured to rotate about a rotational axis to move the driver blade, the cam including a target that rotates with the cam, the method comprising:

• receiving, at a controller of the power tool, a signal from a sensor indicating that the target is at a predetermined rotational position of the cam;
• comparing a motor parameter to a threshold value;
• and
• initiating a speed ramp down in response to the target being at the predetermined rotational position of the cam and the motor parameter being greater than or equal to the threshold value.

A power tool comprising:

• a housing;
• a motor at least partially positioned within the housing;
• a driver blade extending along a driving axis;
• a cam assembly including a cam that is configured to rotate about a rotational axis to move the driver blade, the cam including a target that rotates with the cam;
• a sensor configured to detect the target when the target is at a predetermined rotational position of the cam;
• and
• a controller connected to the motor and the sensor, the controller configured to:
• receive a signal from the sensor indicating that the target is at the predetermined rotational position of the cam,
• compare a motor parameter to a threshold value, and
• initiate a speed ramp down in response to the target being at the predetermined rotational position of the cam and the motor parameter being greater than or equal to the threshold value.