V/F control
... Induction motors with squirrel cage rotors are the workhorse of industry because of their low cost and rugged construction. When Squirrel cage induction machine is operated directly from the line voltages(60 Hz/50 Hz essentially constant voltage) an Induction motor is operated at constant speed. How ...
... Induction motors with squirrel cage rotors are the workhorse of industry because of their low cost and rugged construction. When Squirrel cage induction machine is operated directly from the line voltages(60 Hz/50 Hz essentially constant voltage) an Induction motor is operated at constant speed. How ...
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... (21+5+5+5)=36.00 W were connected, was 12.78 V (Fig. 7). When 1 hour 40 minutes passed, it was decreased to 4.86 V, or by 7.92 V. It was 7.92/0.3=26.00fold as much than voltage drop rate at the terminals of the accumulator, which supplied MG-2, without taking into consideration various time of their ...
... (21+5+5+5)=36.00 W were connected, was 12.78 V (Fig. 7). When 1 hour 40 minutes passed, it was decreased to 4.86 V, or by 7.92 V. It was 7.92/0.3=26.00fold as much than voltage drop rate at the terminals of the accumulator, which supplied MG-2, without taking into consideration various time of their ...
Current Transducer HX 05 .. 15-NP I = 5 .. 15 A
... carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious ...
... carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious ...
Chapter Two: Radio - Frequency Circuits
... • There is a need to modulate a signal using an information signal • This signal is referred to as a baseband signal • The carrier needs to be a higher frequency than the baseband • RF Amplifiers, Oscillators, Mixers, and frequency synthesizers are used to meet these conditions ...
... • There is a need to modulate a signal using an information signal • This signal is referred to as a baseband signal • The carrier needs to be a higher frequency than the baseband • RF Amplifiers, Oscillators, Mixers, and frequency synthesizers are used to meet these conditions ...
Line Voltage Wall Switch Occupancy Sensors and Neutral Conductors
... approach yields ample power for the sensor. A neutral conductor is not always available, especially in retrofit applications. For these applications wall switch sensors are available that are able to function without the use of a neutral conductor. These sensors derive their power source from the po ...
... approach yields ample power for the sensor. A neutral conductor is not always available, especially in retrofit applications. For these applications wall switch sensors are available that are able to function without the use of a neutral conductor. These sensors derive their power source from the po ...
Linearity Improvement Analysis for PAs at mm- Wave Frequencies Joe Valliarampath Graduate
... modulation schemes such as orthogonal frequency division multiplexing (OFDM) have been considered as the modulation scheme for communication systems in the mm-wave frequency band [1]. OFDM is sensitive especially to non-linearities in the transmitter. The power amplifier (PA) is located in the trans ...
... modulation schemes such as orthogonal frequency division multiplexing (OFDM) have been considered as the modulation scheme for communication systems in the mm-wave frequency band [1]. OFDM is sensitive especially to non-linearities in the transmitter. The power amplifier (PA) is located in the trans ...
Application of network analyzer in measuring the
... 3. Dual receiver channels to measure input and output of interest at the frequency of the oscillator. The magnitude and phase gains are measured in several formats. 4. High noise rejection with selectable bandwidth of the receiver channels. 5. Direct interface to a computer for post-processing of da ...
... 3. Dual receiver channels to measure input and output of interest at the frequency of the oscillator. The magnitude and phase gains are measured in several formats. 4. High noise rejection with selectable bandwidth of the receiver channels. 5. Direct interface to a computer for post-processing of da ...
intelligent control scheme for mitigating voltage sag and
... attach and de-attach the load. In the first simulation as shown in Fig. 7 where no compensation was used, we noticed a sag in the voltage profile at the mid of bus. At the beginning of 3 rd cycle, when a load of 10MW was switched on, a decrease in load voltage and a corresponding increase in load cu ...
... attach and de-attach the load. In the first simulation as shown in Fig. 7 where no compensation was used, we noticed a sag in the voltage profile at the mid of bus. At the beginning of 3 rd cycle, when a load of 10MW was switched on, a decrease in load voltage and a corresponding increase in load cu ...
TMdrive®-XL75 Product Application Guide
... As a result of the five-level PWM control, the output current waveform is close to a sine wave, and the heat loss in the windings caused by harmonics is negligible. In addition, harmonic currents in the motor are minimized so there is very little torque ripple on the output shaft. ...
... As a result of the five-level PWM control, the output current waveform is close to a sine wave, and the heat loss in the windings caused by harmonics is negligible. In addition, harmonic currents in the motor are minimized so there is very little torque ripple on the output shaft. ...
pdf format
... Gate BNC or subminiature phono input connectors available for an externally applied pulse train input. A gating signal allows you to rapidly control on/off switching of the laser at rates up to several kilohertz (kHz). The gating signal, when used, is generated by the equipment controlling your ap ...
... Gate BNC or subminiature phono input connectors available for an externally applied pulse train input. A gating signal allows you to rapidly control on/off switching of the laser at rates up to several kilohertz (kHz). The gating signal, when used, is generated by the equipment controlling your ap ...
Coaxial Cable Protection
... voltage to be presented to the equipment input (+ 9Vpk, - 4Vpk ringing for the entire test pulse waveform) measured for a 900MHz 1/4 wave stub with a 3kA 8/20s test waveform and the stub output terminated in to a 50 ohm load). A higher peak voltage will be present if the equipment has internal capa ...
... voltage to be presented to the equipment input (+ 9Vpk, - 4Vpk ringing for the entire test pulse waveform) measured for a 900MHz 1/4 wave stub with a 3kA 8/20s test waveform and the stub output terminated in to a 50 ohm load). A higher peak voltage will be present if the equipment has internal capa ...
MAX8811 High-Speed, Dual-Phase Driver with Integrated Boost Diodes General Description
... DH_ is driven high when the PWM_ is high; DL_ is driven high when PWM_ is low. PWM pulsewidths under 20ns (typ) are rejected, and no switching occurs. The low-side drivers (DL_) have typical 0.9Ω sourcing resistance and 0.4Ω sinking resistance, and are capable of driving 3000pF capacitive loads with ...
... DH_ is driven high when the PWM_ is high; DL_ is driven high when PWM_ is low. PWM pulsewidths under 20ns (typ) are rejected, and no switching occurs. The low-side drivers (DL_) have typical 0.9Ω sourcing resistance and 0.4Ω sinking resistance, and are capable of driving 3000pF capacitive loads with ...
Low-Power Techniques for Network Security Processors
... dynamically adjustable nature of closed-loop system can compensate the variations from process or environment. ...
... dynamically adjustable nature of closed-loop system can compensate the variations from process or environment. ...
Eaton 9390 Marine Datasheet
... • A multilingual graphical LCD display makes possible to monitor the UPS status easily. • Wide software and connectivity options provide monitoring, management and shutdown capabilities over network Cost savings and sustainability • High level of system efficiency leads to utility cost saving, ex ...
... • A multilingual graphical LCD display makes possible to monitor the UPS status easily. • Wide software and connectivity options provide monitoring, management and shutdown capabilities over network Cost savings and sustainability • High level of system efficiency leads to utility cost saving, ex ...
3-Phase BLDC/PMSM Low Voltage Power Stage User Manual
... The MC33937A provides over-current and under-voltage functions. The amplified DC Bus current signal is filtered to remove spikes, and then it is internally fed into the MC33937 over-current comparator input. The OC comparator threshold level is adjusted by external trimmer R38 and filtered by C43. T ...
... The MC33937A provides over-current and under-voltage functions. The amplified DC Bus current signal is filtered to remove spikes, and then it is internally fed into the MC33937 over-current comparator input. The OC comparator threshold level is adjusted by external trimmer R38 and filtered by C43. T ...
ii. indirect current control
... A Hysteresis PWM current controller is employed over the reference and sensed supply currents to generate gating pulses of IGBT’s of the Active filter. ANN based theory can work effectively under balanced as well as unbalanced source and load conditions because the compensating currents are calculat ...
... A Hysteresis PWM current controller is employed over the reference and sensed supply currents to generate gating pulses of IGBT’s of the Active filter. ANN based theory can work effectively under balanced as well as unbalanced source and load conditions because the compensating currents are calculat ...
generator using instantaneous power control
... variable loads and variable speed operation. Another problem of this technique i s that the machine can only achieve and maintain excitation under certain speed and load conditions. To overcome the poor voltage regulation of the SEIG, a number of schemes have been proposed in [1]-[4]. The scheme bas ...
... variable loads and variable speed operation. Another problem of this technique i s that the machine can only achieve and maintain excitation under certain speed and load conditions. To overcome the poor voltage regulation of the SEIG, a number of schemes have been proposed in [1]-[4]. The scheme bas ...
Choosing the Best ADC Architecture for your
... value on the last sampled voltage. The device will trigger the next conversion after the next START conversion signal is received. In summary, the SAR ADC’s is a very popular topology used in many general purpose acquisition systems. ...
... value on the last sampled voltage. The device will trigger the next conversion after the next START conversion signal is received. In summary, the SAR ADC’s is a very popular topology used in many general purpose acquisition systems. ...
Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.