The difference between both dc and ac cooling cooling fan heat dispersion, rounding
2: from specification points: ac cooling fan: 80 * 80 * 25 mm / 38 mm / 80 * 80 * 92 * 92 * 25 mm / 120 * 120 * 25 mm / / 150 * 120 * 120 * 38 mm to 50 mm / 51 mm / 172 * 172 * 220 * 220 * 60 mm/dc cooling fan: 30 * 30 * 10 mm / 40 * 40 * 10 mm / 50 * 50 * 10 mm / 60 * 60 * 10 mm / 40 * 40 * 20 mm / 50 * 50 * 15 mm. 。 。 。 。 。 。 Three: 120 * 120 * 25 mm from technical points: ac cooling fan: single-phase internal structure is composed of two coil winding, a winding is a startup winding is run, the two winding in series, forming three points.
series connection point for public side, the startup winding terminal end to run run to start the end winding end,
ac motor will also need a startup capacitor. Capacity is usually 1-2 uf
between, pressure is usually 250 v
. This refers to the normal use of the mains ac motor, this kind of capacitor is polyester capacitor,
no is negative, there are two joints, a pick up at the end of the startup winding, a head to run at the end of the
winding, form a triangle, power supply ( Do not need to distinguish between zero line of fire A joint operation (
winding end Namely and capacitor of a head also connect together) , another public side, the grounding line took the motor shell.
usually single-phase ac motor can also be used as a running start winding winding,
if switch run to start the windings, Is the power of a pick up to the public,
pick running side change to start end, it is used as a running start winding winding) , the machine can produce reversed, and this is the only way to realize single-phase ac motor to change. Dc cooling fans:
is the difference between dc motor with ac motor is: three tributaries of motor winding,
around the rotor respectively, and install a permanent magnet block on the spindle, surround rotor,
and don't need to start the capacitance, but need to carbon brush, change the dc motor steering method is simple,
as long as change over the power input is the cathode can be achieved.
4: from application field points:
ac cooling fan: again is commonly used in automobile mechanical equipment, medical equipment and other large equipment above
dc cooling fans, commonly used in electronic equipment and appliances and other small devices