Discuss the shunt field power supply.
What will be an ideal response?
Most solid-state DC motor controllers provide a separate DC power supply, which is used to furnish excitation current to the shunt field. The shunt field of most industrial motors requires a current of only a few amperes to excite the field magnets; therefore, a small power supply can be used to fulfill this need. The shunt field power supply is generally designed to remain turned on even when the main (armature) power supply is turned off. If power is connected to the shunt field even when the motor is not operating, the shunt field will act as a small resistance heater for the motor. This heat helps prevent moisture from forming in the motor due to condensation.
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The knot shown in the figure above is a _____.
a. clove hitch b. half-hitch safety c. square d. bowline
Gertrude Hyde (an artist and gardener of the 1800s) was interested in perennials and in using them in borders; her ability was to blend and contrast perennials having different sizes, shapes, and foliage
Indicate whether the statement is true or false
In a ratiometric tracking resolver, calculations performed to find the degrees the rotor has turned is determined by the____________________ of the induced voltage. In the phase-digitizing resolver, calculations to find the degrees the rotor has turned is determined by the ____________________ of the induced voltage.
Fill in the blank(s) with the appropriate word(s).
Accident costs are often classified as _____.
a. causes and effects b. injury reportable c. time lost d. direct and indirect