| 摘要 |
In filter and blower units for breathing masks or bonnets used in potentially explosive areas, the direct current motor comprises a fixed stator coil module ( 1 ) and a magnetic rotor that can be rotated around the perimeter of said module and forms the impeller at the same time. The coils ( 5 ), the terminals and electric connecting lines ( 7 ) as well as upstream motor control and voltage converter modules ( 8, 9 ) are embedded in a non-conductive casting compound ( 6 ). Power is supplied from an intrinsically safe accumulator or battery pack ( 15 ) at a voltage that is still considered intrinsically safe using a higher current value to match the required motor output. The filter and blower unit is intrinsically safe despite its high-performance rating and can be used in zone "0" potentially explosive atmospheres.
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