Hi Scott
Motors will not draw the same current all the time, usually they draw more at startup. Running the blower on high draws more amps than on lower settings. If the motor needs lubrication it will also draw more current.
Bad starter windings might turn the motor just fine when the motor is warm but not work at all when the motor is cold because the cold adds more resistance. Sometimes you can kick start the blower by pushing the blades with your fingers to get it going like the old prop planes.
When current flows through the windings around the motor, it creates a magnetic field that turns the shaft. As these windings age or become shorted, the magnetic field strength weakens and more current is drawn. This is why fuses are needed so when there is excessive current draw and smoke there is no fire if there is a short circuit.
Remember, Heat, noise and vibration eventually cause motor failure. This is why lubrication and cleaning help prolong the life!
Anyway, the blower should always draw less than the fuse rating, if not the motor windings are on the way out and the motor or blower really should be replaced.
P = I*V
So let's use this Fasco blower for example:
http://www.grainger.com/Grainger/DA...cm_sp=IO-_-IDP-_-RR_VTV70300505&cm_vc=IDPRRZ1
115 Volts, 1500 RPM, 0.74 Full Amps load into Free Air, 134 CFM, 60 Hz
Astoria Convection Blower Fan voltage for different speeds
Speed  Volts AC  CFM
6 Â Â Â 110 Â Â Â 165
5 Â Â Â 105 Â Â Â 157.5
4 Â Â Â 100 Â Â Â 150
3 Â Â Â 90 Â Â Â Â 135
2 Â Â Â 85 Â Â Â Â 127.5
1 Â Â Â 70 Â Â Â Â 105
So using the electrical formula for Power
and say medium speed of 90 volts at a current draw of approx .40 amps
P= 90 * 0.40 = 36 watts
Since pellet stove motors fall between light duty and standard duty since they are only used in the colder season, a life expectancy of 4 - 7 years if properly cleaned and maintained
Click to enlarge the Motor Failure Chart Below:
http://www.maintenanceworld.com/Art...ubleshooting-electric-motors.htm#heatnoisevib