Resistive load что это
Resistive Load
resistive load input, high input impedance or integrating receivers and low input impedance.
Related terms:
Sustainable Water & Energy Systems
Modeling of Electrical Load
Resistive load can be modeled by considering transformed q— and d-axis load currents, equation for pure resistive load can be written as,
where ilq and ild are the load currents and RL is resistance value connected across the capacitor.
Load current equation when inductive load is considered along with the resistive load can be written as,
where L is the value of inductance connected.
Interfacing to Integrated Hall-Effect Devices
5.11 Relays, Solenoids, and Inductive Loads
Fuel cell and hydrogen power plants
9.4.4.2 Results with variable resistive load
This section presents the step-by-step modeling and simulation process of a PEMFC energy system using MATLAB/SIMULINK. The performance of the FC system with DC load controlled by the PI controller was evaluated. The results of simulation revealed that the proposed controller can handle both transient as well as steady-state load.
AC to DC thyristor converters
3.21 PROBLEMS
A resistive load is supplied with variable voltage d.c. from a Triac full-wave rectifier bridge combination connected to an a.c. supply. Draw the circuit diagram and, with the aid of voltage waveform sketches, calculate the load power dissipation for load resistance of 100Ω, a voltage supply of 110V at 50Hz, and firing angle delays of 45°, and (b) 135°. Assume ideal switching devices.
A full-wave fully controlled thyristor a.c. to d.c. converter supplies power to (a) a resistive load of 250Ω, (b) a highly inductive load with a resistance of 250Ω. The a.c. supply is 240V, 50Hz. Determine the values of load average and rms voltage and current, load power and converter power factor for (a) α = 30°, (b) α = 60°. Assume ideal switching devices.
Two of the bridge thyristors in Q.2 are replaced by diodes to make the converter half-controlled. Repeat the calculations of Q.2 for this converter and compare the performance of both converters.
A single-phase fully controlled SEDC motor drive has an armature voltage constant of 0.9V/rad/s, and an armature resistance of 0.75Ω. The field current is held constant at its rated value. Mains supply to the drive is 250V, 50Hz.
Determine the average armature voltage, current and torque at an armature speed of 1200rev/min, with a firing angle delay of (a) α = 30°, (b) α = 70°. Assume steady armature current.
Compare the performance of the drive of Q4 with that of the half-controlled case given for the same conditions, i.e. repeat the calculations in Q4 for a single-phase half-controlled SEDC drive.
A separately excited d.c. motor has an armature resistance of 1.0Ω and an armature voltage constant of 0.8V/rad/s. Determine the average armature current and torque output, with firing angle delay of α = 45° and armature speed of 1600rev/min. The armature is driven by: (a)
a full-wave fully controlled single-phase converter
a half-controlled single-phase converter
a three-phase half-wave converter
a three-phase full-wave converter.
The supply phase voltage is 230V in each case.
A three-phase half-wave converter drives an SEDC motor rated at 500A, 1000rev/min with Ra = 0.02Ω and kv = 0.8Nm/A (V/rad/s). Find the delay angle required for an output torque of 400N m at rated speed.
The line voltage input to the converter is 415V at 50Hz.
A sensor is usually an electro-mechanical device whose purpose is to measure a physical property such as a force, torque, pressure or temperature eletronically and send the signal to other electronics, frequently a computer processor.
A load cell is a sensor or a transducer that converts a load or force acting on it into an electronic signal. This electronic signal can be a voltage change, current change or frequency change depending on the type of load cell and circuitry used. There are many different kinds of load cells. We offer two kinds of load cells: resistive load cells and capacitive load cells.
Resistive Load Cells
Resistive load cells work on the principle of piezo-resistivity. When a load/force/stress is applied to the sensor, it changes its resistance. This change in resistance leads to a change in output voltage when a input voltage is applied.
Capacitive Load Cells
Capacitive load cells work on the principle of change of capacitance. When a force is applied, the gap or area between two capacitive plates changes its capacitance. This leads to a change in output frequency when a input voltage is applied.
Resistive Load Cells
How Does a Resistive Load cell Work?
A load cell is made by using an elastic member (with very highly repeatable deflection pattern) to which a number of strain gauges are attached.
In this particular load cell, there are a total of four strain gauges that are bonded to the upper and lower surfaces of the load cell.
When the load is applied to the body of a resistive load cell as shown above, the elastic member, deflects as shown and creates a strain at those locations due to the stress applied. As a result, two of the strain gauges are in compression, whereas the other two are in tension.
Wheatstone Bridge Circuit
These load cells have been in use for many decades now, and can provide very accurate readings but require many tedious steps during the manufacturing process. Single point load cells and shear beam load cells incorporate multiple strain gauges to compensate for off center loading, temperature compensation and other errors that need to be addressed for commercial grade applications.
resistive load bank
1 resistive load bank
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