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PTC305C Series PTC Thermistors Motor Start Packages
PTC305C Series PTC Thermistors Motor Start Packages

... THESE DEVICES ARE INTENDED FOR APPLICATION ON 240 VOLT LINES OR SYSTEMS WITH MAXIMUM LINE VOLTAGE UP TO 265 V. The PTC305C20, 21 and 22 are also used on 120 V systems where the motor is designed to use same run capacitor and PTC as equivalent 230 V compressor. ...
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... Previous labs demonstrate that the response of a system is modified by negative feedback control. The response speed of the system is increased as the proportional gain on the system increases. This was demonstrated using an electrical analog for a process. This section of the circuit represented a ...
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Brushless DC electric motor



Brushless DC electric motor (BLDC motors, BL motors) also known as electronically commutated motors (ECMs, EC motors) are synchronous motors that are powered by a DC electric source via an integrated inverter/switching power supply, which produces an AC electric signal to drive the motor. In this context, AC, alternating current, does not imply a sinusoidal waveform, but rather a bi-directional current with no restriction on waveform. Additional sensors and electronics control the inverter output amplitude and waveform (and therefore percent of DC bus usage/efficiency) and frequency (i.e. rotor speed).The rotor part of a brushless motor is often a permanent magnet synchronous motor, but can also be a switched reluctance motor, or induction motor.Brushless motors may be described as stepper motors; however, the term stepper motor tends to be used for motors that are designed specifically to be operated in a mode where they are frequently stopped with the rotor in a defined angular position. This page describes more general brushless motor principles, though there is overlap.Two key performance parameters of brushless DC motors are the motor constants Kv and Km.
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