Steve Vidal

Speed Control of Motors
An introduction to variable-frequency drives. Speed, torque, and horsepower are three inter-related parameters in motor control. The speed of a motor, measured in revolutions per minute (rpm), defines
Introduction To PLCs
The programmable logic controller (PLC) is a microprocessor-based system that accepts input data from switches and sensors, processes that data by making
Magnetic Motor Starter Basics 2
The NEC defines a controller in a few different ways. In Art. 100, a controller is described as a device or group of devices that serves to govern, in
Standard Motor Control Circuit Primer
Single-phase and 3-phase AC squirrel cage induction motors need some type of control circuit to initiate a start or stop function. The two types of ladder
Ladder Logic Basics 1
A specialized segment of the electrical construction and maintenance industry, AC motor control is an area that requires specific knowledge in order to
Differentiating Between DC and AC Motors 1
By definition, an electric motor is a device that converts electrical energy into mechanical energy. An electrical signal is applied to the input of the

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