Term
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Definition
| Protect the Rest of the interface circuit from unexpected input or prevent the elecric impedance interaction between interface circuits and sensors or analog devices. |
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Term
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Definition
| When the analog signal is sampled in a discrete manner, attention must be paid to sampling frequency and the maximum frequency of the source signal to avoid aliasing of the source signal. Sampling frequency should be more than twice as large cut off frequency. |
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Term
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Definition
| Adjust the analog signal voltage level to an A-D converter and from a D-A converter to a certain desired range. |
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Term
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Definition
| Capture the analog signal and hold the signal at the captured level as DC voltage. |
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Term
| Analog to Digital Converter |
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Definition
| Convert an analog voltage input to the digital data with a certain resolution and output the digital data converted. |
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Term
| Digital to Analog Converter |
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Definition
| Convert digital data to an analog voltage with a certain resolution and output the voltage signal converted. |
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Term
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Definition
Rotor is a coil to generate q-axis magnetic field
Stator is a permanent magnet for d-axis magnetic field
Advantage is that just supplys the DC power. Simple control for variable speed.
Disadvantage is that mechanical brush (commutator) will wear out and rotor heat generation. |
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Term
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Definition
Rotor is just an electircally conductive rotor.
Stator is coil to generate q-axis magnetic field and induced current in rotor.
Advantage is simple and most inexpensive motor structure
Disadvantage is heat generation in rotor. Control is more difficult because slip control is needed for variable speed application. |
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Term
| Permanent Magnet Synchronous Motor |
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Definition
Rotor is permanent magnet for d-axis magnetic field.
Stator is coil to generate q-axis magnetic field.
Advantage is that no mechanical commutation, higher reliability, less heat generation in rotor.
Disadvantage is electric commutation by AC voltage is needed, variable speed needs rotor position detection and variable frequency power supply. |
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