@jonathanbyrn - The motor does run a little hot, as we are driving it at it's max torque. This is to reduce any potential problems with the internal flexible cable torque causing the motor to skip steps. You should be fine as long as you are operating the sensor in an environment below ~30 degrees C.
@yvesseiler - With regard to the beeping noise, you are correct that this is coming from the motor shaft, which is resonating in the 90 degree bracket. It occurs when the motor is being held in micro step positions, which are between normal steps. The motor driver has to osculate the motor between two normal steps, causing the vibration. The best way to reduce this would be to run the stepper motor drivers at a frequency that is above the range of human hearing, but the current drivers are not cable of this.