This standard applies to DC drive motors such as aircraft DC motors, permanent magnet DC motors, steady-speed DC motors, pump DC motors, starting DC motors, fan DC motors, etc., whose outer casing diameter is not greater than 130 mm. For other appearance and structural types not specified in this standard, special regulations are allowed due to the particularity of the product.
HB 5517-1980 history
1970HB 5517-1980 Basic shape and structure of aircraft DC micro drive motor