B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
B03C3/34—Constructional details or accessories or operation thereof
B03C3/66—Applications of electricity supply techniques
DC micromotor with amorphous semiconductor switching devices - has devices shunting rotor windings and acting as voltage limiters to increase motor life