| 摘要 |
<p>The motor is intended for a pump and has a casing (1) in which a rotor (17) with a rotor shaft (9) is rotatably mounted. The rotor (17) is surrounded by a stator (26). The motor is an electronically commutated, brushless d.c. motor, the circuitry of which is in the form of circuit electronics (20) housed in the casing (1). With this motor, no carbon dust contamination occurs in the casing (1), as is otherwise the case with known commutator motors. This reliably prevents leakage voltages so that this motor, when it has a pressure-encapsulated casing (1), can be used without risk in hazardous areas. The electrical insulation system remains virtually unchanged even after long periods in operation due to the absence of abrasive carbon particles. Also within the sealed casing are housed a protective switch 27 actuated from outside by a knob 50 and a transformerless mains to low voltage d.c. converting circuit. The position sensing arrangement employs Hall sensors 19 and magnets 18, the latter mounted on a disc 21 shaped as an additional cooling fan. The sealed casing 1 is of metal, the outer jacket 28 of electrostatically non-chargeable plastics. …<IMAGE>… </p> |
