Describe a bifilar stepping motor.
What will be an ideal response?
The term bifilar means that there are two windings wound together. This is similar to a transformer winding with a center-tap lead. A bifilar stepping motor has twice as many windings as does the three-lead type, which makes it necessary to use smaller wire in the windings. This results in higher wire resistance in the winding, producing a better inductive–resistive (L/R) time constant for the bifilar wound motor. The increased L/R time constant results in better motor performance. The use of a bifilar stepper motor also simplifies the drive circuitry requirements. Notice that the bifilar motor does not require an aboveground–belowground power supply. As a general rule, the power supply voltage should be about five times greater than the motor voltage. A current-limiting resistance is used in the common lead of the motor. This current-limiting resistor also helps improve the L/R time constant.
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Fill in the blank(s) with the appropriate word(s).
A precise square on the end of a shaft is best machined:
A) With a dividing head B) With a vertical shaping attachment C) By accurately centering the cutter over the shaft D) All of the above
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Answer the following statement true (T) or false (F)
When dividing fractions, both the divisor and dividend must be inverted.
Answer the following statement true (T) or false (F)