Electric controllers Electric motors 217 Automatic control 93 Programmable controllers 62 Design and construction 61 Electric motors, Direct current 52 Electronic control 51 PID controllers 50 Electric driving 33 Alternating current 23 Electric machinery 23 Electric motors, Alternating current 19 Electric motors,Direct current 16 Electric transformers 16 Electric equipment 15 Electric generators 15 Industrial electronics 15 Data processing 14 Direct current 14 Control 13 Computer programs 12 Electric motors, Induction 12 Air conditioning 11 Buildings 11 Heating 11 Voltage regulators 11 Study and teaching 9 Electronic traffic controls 8 Molds (Cookware) 8 Traffic signs and signals 8