122-28176 Parallax Inc, 122-28176 Datasheet - Page 160
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Page 150 · Process Control
A high-frequency duty cycle is not always desirable. Inductive loads, such as motors,
limit how fast the current can change. With high-frequency duty cycles the current does
not have time to build and will limit the response at lower duty cycle values.
Figure 5-10 Oscilloscope Capture of 50% Duty Cycle
Challenge 5-2: Modifying the Drive Loop
There are a few issues in driving the fan and obtaining good RPM reading in respect to
drive. The fan has inertia, which limits how fast it can change speed. As drive is
changed, the change in speed is not instantaneous. It takes a certain amount of time to
bring the fan up to speed, and conversely to slow it down. In general, the greater the
mass, the greater the inertia of the object. With a rotating element, the shape and
diameter also comes into play when determining inertia.
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