Precision Agriculture
Sensors A sensor is a device used to measure some quantity of interest and produce a signal (usually electrical) representing that measurement. Sensor types A variety of sensor types have…
Motor Nameplate Information
Design and rating standards developed by the National Electrical Manufacturer’s Association (NEMA) permit the comparison of motors from different manufacturers. Information on the nameplate may include any or all of…
Dual-Voltage Motors
Many motors are designed to be operated at either of two different voltages. For example, the three-phase motors of Figure can be connected to operate on 230- volt or 460-volt…
Three-Phase Induction Motors
Single-phase motors become impractical in sizes much above 7.5 kW (10 hp) and, for larger power requirements, three-phase motors become the practical choice. Threephase, induction-type motors are available in sizes…
Repulsion-start, induction-run motors
A repulsion-start, induction-run motor is illustrated schematically in Figure 3.8. Unlike the previous induction motors, the repulsion-start motor does not use auxiliary starting windings on the stator. Instead, a wound…
Two-value-capacitor, induction-run motors
A schematic diagram of a two-value-capacitor, induction-run motor (also called a capacitor-start, capacitor-run motor) is shown in Figure 3.7. The auxiliary winding used for starting is also used for running.…
Capacitor-start, induction-run motors
A capacitor-start, induction-run motor is illustrated in Figure 3.6a. An electrolytic capacitor has been inserted in series with the starting windings to shift the phase of the starting current as…
Types of Single-Phase Induction Motors
Split-phase induction motors The motor of Figure 3.5a is called a split-phase induction motor. A set of starting windings has been added on poles that are rotated 90° from the…
Principles of Operation of Induction Motors
The motor of Figure 3.3 is not a practical motor, but it illustrates the principles of operation of induction motors. A squirrel-cage rotor similar to the one in Figure 3.1…
Electrical Power for Agricultural Machines
Electric motors are devices that convert electric power into mechanical power. They are often chosen over engines for applications in which an electrical power supply is available. Compared to engines,…
