Phase-locked Loop Servo Systems
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On: 06 Nop, 2017
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Phase-locked Loop Servo Systems is a closed-loop control system that is used widely in communication systems for frequency demodulation and bit synchronization. Phase-locked loop servos are also use for velocity control, especially when a high degree of speed regulation and accuracy is desired.
A phase-locked loop in its basic form is represented by the block diagram of Fig. 37. The input signal and the feedback signal are sinusoidal and upon locking both signals will have the same frequency and a constant phase difference. Any deviation from the desired phase difference is detected by the phase detector and is transmitted to the vo;tage-controlled oscillator (VCO) to correct the error. Since the phase difference is constant, the frequencies of the input and the feedback signals are the same. This principle can be applied to servo systems for which the control objective is speed regulation.
In the case of a phase-locked loop servo for speed control, the VCO is replaced by an amplifier-motor-encodercombination. The output of the encoder is a sinusoidal signal with a frequency proportional to the angular velocity of the motor. Fig. 38 shows the block diagram of a phase-locked loop servo.
The main difference between a phase-locked servo and the conventional servo systemis that the reference input for a phase-locked servo is a periodic signal from the encoder is a pulse train whose frequency is proportional to the speed of the motor. The phase detector compares the frequencies or phase of the reference and feedback signals, and generates an error voltage proportional to the difference. The error voltage is than filtered and sent to the motor, the motor speed changes to reduce the difference between the frequencies or phases of the two signals. Thus the motor speed can be syncronized to the reference frequency.1993 Honda CB500R Electrical Systems
The following electrical system and wiring diagram applies for 1993 Honda CB500R motorcycle. In this manual you will find brief information about the charging system/alternator, ignition system (including service information, system location, troubleshooting, inspection, coil inspection, pulse generator inspection and ignition timing), electric starter, lights, meter and switches.BMW E12 L Jetronic Fuel Injection Systems Schematic Diagram
The following article discuss on L-Jetronic Fuel Injection Systems for BMW E12 which covers following topics: Basic Engine Combustion Process, Combustion Requirements, Fuel Delivery Implementations, Electronic Fuel Injection System Components, L-Jetronic System, Troubleshooting, Conversion to Lambda Control, and Performance. The fuel injections system consist of throttle and idle/WOT switches, Air Mass Measurement, Fuel Pump, Fuel Injectors, Pressure regulation, Control Unit (some with O2 control), Combo Relay, Cold Start, Warm up enrichment, Warm up Idle compensation.LM4570 Datasheet 8211 Motor Driver for Mobile Phones PDAs and Video Game Systems
The LM4570 is a single supply motor driver for improved sensory experience in mobile phones and other handheld devices. This device features Low Power Shutdown Mode, Minimum external components, Available in space-saving LLP package, Output Short Circuit Protection, Fast Turn on Time, High Output Current Capability, and Wide Output Voltage Range.Three Phase Transformers Circuits Diagram
In the 1880’s the development of transformers contributed essentially to the enforcement of alternating and three-phase current technology. Transformers enable the transmission of electrical energy using the voltage adapted to power and distance. A three-phase transformer is made of three sets of primary and secondary windings, each set wound around one leg of an iron core assembly. A three-phase transformers must have (3) coils or windings connected in the proper sequence in order to match the incoming power.Six Phase Rectifier Circuit Diagram
A Six-Phase rectifier is kind a transformer used to produce six alternating electromotive forces which differ in phase by one-sixth of a cycle, and which feed six diodes. When polyphase AC is rectified, the phase-shifted pulses overlap each other to produce a DC output that is much “smoother” (has less AC content) than that produced by the rectification of single-phase AC. Following schematic diagram shows sample of a Six-Phase rectifier circuit diagram.Download phase-locked loop servo systems in [getwiringdiagram.com] which provided circuit and wiring diagram for automotive, car, motorcycle, truck, audio, radio, electronic devices, home and house appliances.
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