Improvements in Controlling Apparatus for Electric Motors


3840. Klinkenberg, J. Feb. 16. Lifts.-In a system for controlling motors, particularly suitable for lifts, one handle operates the switches for the field circuits, the armature circuits, the starting resistance, and brakes. The drawings show connections for a shunt-wound motor. The brake is of the known type shown, and the automatic resistance R is preferably that described in Specification No. 19,611, A.D. 1904. To start the lift the lever A is put in position B<1> the current then flows through leads P<1>, P<2> to magnet C, and, closing the switch C', current passes to the field magnets through leads P, P', P<4>, P<5>, M<1>, and thence through leads M<2>, M<3>, to the mains. When the switch C' closes, the brake is removed as the coil C<3> is excited through leads P, P<3> and P<6>. Similarly in the next position B<2>, the switch C<8> is closed and supplies current through leads P, P<3>, P<4>, P<8>, M<4>, and M<5>, and resistance R to the brushes E', E<2>. In the third position, the magnet C<9> is excited and the resistance R is gradually cut out. To stop the motor, the handle is turned back and the operations are reversed, but if the lift starts to drive the motor the handle is at once brought back to position B', and a switch D, coupled to switch C<8>, passes current generated by the motor to the braking-resistance D', which is automatically cut out as the current fails. The magnet F and resistance D' may be dispensed with, a switch being employed in connection with the resistance R. The brake is brought into action on bringing the arm A to the neutral position. The motor is reversed by reversing the handle A. In the first position switch C<8> releases the brake and excites the. fields, in the second, switch C" closes and supplies current to the brushes E<1>, E<2> in the reverse direction, and in the third position, the resistance R is slowly cut out.




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