SJ200 Inverter
Sensorless Vector Control
A technique used in
Appendix
Setpoint (SP) | The setpoint is the desired value of a process variable of interest. |
| See also Process Variable (PV) and PID Loop. |
An AC power source consisting of Hot and Neutral wires. An Earth | |
| Ground connection usually accompanies them. In theory, the |
| voltage potential on Neutral stays at or near Earth Ground, while |
| Hot varies sinusoidally above and below Neutral. This power source |
| is named Single Phase to differentiate it from |
| sources. Some Hitachi inverters can accept single phase input |
| power, but they all output |
| |
Slip | The difference between the theoretical speed of a motor at no load |
| (determined by its inverter output waveforms) and the actual speed. |
| Some slip is essential in order to develop torque to the load, but too |
| much will cause excessive heat in the motor windings and/or cause |
| the motor to stall. |
Squirrel Cage | A |
| an AC induction motor. |
Stator | The windings in a motor that are stationary and coupled to the |
| power input of the motor. See also Rotor. |
Tachometer | 1. A signal generator usually attached to the motor shaft for the |
| purpose of providing feedback to the speed controlling device of the |
| motor. 2. A |
| shaft rotation speed and display it on a readout. |
Thermal Switch | An electromechanical safety device that opens to stop current flow |
| when the temperature at the device reaches a specific temperature |
| threshold. Thermal switches are sometimes installed in the motor in |
| order to protect the windings from heat damage. The inverter can |
| use thermal switch signals to trip (shut down) if the motor |
| overheats. See also Trip. |
Thermistor | A type of temperature sensor that changes its resistance according |
| to its temperature. The sensing range of thermistors and their |
| ruggedness make them ideal for motor overheating detection. |
| Hitachi inverters have |
| detect an overheated motor and shut off (trip) the inverter output. |
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