Automatic electrical motor speed control

Circuit arrangement for regulating the rpm of a series motor

Circuit for automatic operation of a series brake upon power los

Control circuits for electrically driven vehicles

D.C. control circuits

Drive circuit for a DC motor

Drive system for domestic appliances

Electric drive system and method

Field weakening system for pulse-controlled three-terminal d.c.

Four quadrant control of series motors

Method and apparatus for quiet fan speed control

Motor speed control

Rheostatic control system for a DC motor

Series (or compound) motor and control circuit for adjusting eff

Series or compound motor control circuit having dual series wind

Series wound motor

Series-wound electric motor and control system for governing the

Series-wound motor with a braking element

Solid state series motor control

Speed control and braking circuit for a series connected DC mach