Different Types of Bearing Currents – The Fundamentals - Flow-Tech
... the thin oil film separating races from rolling elements is strongly dependent on external influences, including the presence of a voltage. As a result, the current and voltage characteristics seen in a rotating bearing are not simply described by a resistive value. In fact, it is not simply describ ...
... the thin oil film separating races from rolling elements is strongly dependent on external influences, including the presence of a voltage. As a result, the current and voltage characteristics seen in a rotating bearing are not simply described by a resistive value. In fact, it is not simply describ ...
IOSR Journal of Dental and Medical Sciences (IOSR-JDMS)
... quality of power is the one, which experience any voltage, current or frequency deviation, from normal operation. For ideal electrical systems, the supplied power should have perfect current and voltage sinusoidal waveforms, being safe and reliable. The electric utilities can control the voltage lev ...
... quality of power is the one, which experience any voltage, current or frequency deviation, from normal operation. For ideal electrical systems, the supplied power should have perfect current and voltage sinusoidal waveforms, being safe and reliable. The electric utilities can control the voltage lev ...
LM2575 数据资料 dataSheet 下载
... Output ripple of 50 mV to 150 mV typically can be achieved with capacitor values of 220 µF to 680 µF. Larger COUT can reduce the ripple 20 mV to 50 mV peak-to-peak. To improve further on output ripple, paralleling of standard electrolytic capacitors may be used. Alternatively, higher-grade capacitor ...
... Output ripple of 50 mV to 150 mV typically can be achieved with capacitor values of 220 µF to 680 µF. Larger COUT can reduce the ripple 20 mV to 50 mV peak-to-peak. To improve further on output ripple, paralleling of standard electrolytic capacitors may be used. Alternatively, higher-grade capacitor ...
HX460 with External Pulse Width Modulated Drive
... GIGAVAC contactors require that coil current does not flow when the contacts open. Since PWM circuits require a freewheeling or fly back diode be placed across the coil this diode must be removed from the circuit when the contacts are opened. Figure 1 shows a typical circuit that can be used to t ...
... GIGAVAC contactors require that coil current does not flow when the contacts open. Since PWM circuits require a freewheeling or fly back diode be placed across the coil this diode must be removed from the circuit when the contacts are opened. Figure 1 shows a typical circuit that can be used to t ...
1 STN-99/2015 TECHNICAL SPECIFICATION FOR 33KV
... transformer for easy access. The secondary terminals shall be provided with short circuiting arrangements of Current Transformers. The secondary taps shall be adequately reinforced to ...
... transformer for easy access. The secondary terminals shall be provided with short circuiting arrangements of Current Transformers. The secondary taps shall be adequately reinforced to ...
Simulation of DC-DC Converter-Fed BLDC Motor Drive for PFC
... household applications such as fans, water pumps, blowers, mixers, etc. [1], [2]. The use of the brushless direct current (BLDC) motor in these applications is becoming very common due to features of high efficiency, high flux density per unit volume, low maintenance requirements, and low electromag ...
... household applications such as fans, water pumps, blowers, mixers, etc. [1], [2]. The use of the brushless direct current (BLDC) motor in these applications is becoming very common due to features of high efficiency, high flux density per unit volume, low maintenance requirements, and low electromag ...
national unit specification: general information
... This Unit introduces candidates to the principles of direct current (dc) power supplies. This Unit is suitable for candidates wishing to progress a career in electronic engineering. It is also relevant to candidates studying other branches of engineering, science or technology, requiring knowledge o ...
... This Unit introduces candidates to the principles of direct current (dc) power supplies. This Unit is suitable for candidates wishing to progress a career in electronic engineering. It is also relevant to candidates studying other branches of engineering, science or technology, requiring knowledge o ...
SVC Static Var Compensator An insurance for improved grid system
... In the BCT, anti-parallel thyristors have been integrated on a common silicon wafer and therefore, only one thyristor stack is required instead of two (one for each current direction). With this arrangement, only half the number of thyristor housings is needed. The number of components in a valve is ...
... In the BCT, anti-parallel thyristors have been integrated on a common silicon wafer and therefore, only one thyristor stack is required instead of two (one for each current direction). With this arrangement, only half the number of thyristor housings is needed. The number of components in a valve is ...
Varistors: Ideal Solution to Surge Protection
... power line and high capacity, utility-type applications. Compared with transient suppressor diodes, varistors can absorb much higher transient energies and can suppress positive and negative transients. Furthermore, against crowbar-type devices, varistor response time is typically less than a nanose ...
... power line and high capacity, utility-type applications. Compared with transient suppressor diodes, varistors can absorb much higher transient energies and can suppress positive and negative transients. Furthermore, against crowbar-type devices, varistor response time is typically less than a nanose ...
SiC “Super” Junction Transistors Offer Breakthrough High Temp
... An inductively loaded chopper circuit configuration and a standard double-pulse scheme were used for comparing the switching performance of SiC SJT and Si IGBTs comprises of an inductively loaded chopper circuit configuration. A GeneSiC 1200 V/ 7A SiC Schottky diode [6] and Si IGBT co-packs were use ...
... An inductively loaded chopper circuit configuration and a standard double-pulse scheme were used for comparing the switching performance of SiC SJT and Si IGBTs comprises of an inductively loaded chopper circuit configuration. A GeneSiC 1200 V/ 7A SiC Schottky diode [6] and Si IGBT co-packs were use ...
Comparing Topologies and the (Design) Rules
... ‘picks’ the lowest input voltage 7V, Designer B picks the highest input voltage 21V, and Designer C picks the nominal value of 14V, all of them actually need Designer S (‘Senior’) to breathe down their necks for a couple of years more! For the correct answer is Vin=10V. The first step must be to cle ...
... ‘picks’ the lowest input voltage 7V, Designer B picks the highest input voltage 21V, and Designer C picks the nominal value of 14V, all of them actually need Designer S (‘Senior’) to breathe down their necks for a couple of years more! For the correct answer is Vin=10V. The first step must be to cle ...
http://kth.diva
... of waiting-mode for approximately two decades [1]-[5]. The main reason to this is that the material itself has not been sufficiently mature for series production of power semiconductor components. During recent years, however, tremendous improvements in material quality have been achieved, and as a ...
... of waiting-mode for approximately two decades [1]-[5]. The main reason to this is that the material itself has not been sufficiently mature for series production of power semiconductor components. During recent years, however, tremendous improvements in material quality have been achieved, and as a ...
Introduction to Voltage Source Inverters
... In Fig. 33.1(a), the transistors work in active (amplifier) mode and a sinusoidal control voltage of desired frequency is applied between the base and emitter points. When applied base signal is positive, the p-n-p transistor is reverse biased and the n-p-n transistor conducts the load current. Simi ...
... In Fig. 33.1(a), the transistors work in active (amplifier) mode and a sinusoidal control voltage of desired frequency is applied between the base and emitter points. When applied base signal is positive, the p-n-p transistor is reverse biased and the n-p-n transistor conducts the load current. Simi ...
NE5534, NE5534A
... Supply voltage, VCC + (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V Supply voltage, VCC – (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
... Supply voltage, VCC + (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V Supply voltage, VCC – (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Ohm`s Law - MSU Physics
... Figure 2.4: Schematics of meters being connected in a circuit. voltmeter) or current (as an ammeter), one cable is always connected to the COM plug. If the multimeter is used to measure current, the other lead is connected to either the 10A plug or the 400mA plug. A voltmeter must be connected in pa ...
... Figure 2.4: Schematics of meters being connected in a circuit. voltmeter) or current (as an ammeter), one cable is always connected to the COM plug. If the multimeter is used to measure current, the other lead is connected to either the 10A plug or the 400mA plug. A voltmeter must be connected in pa ...
Mercury-arc valve
A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC). It is a type of cold cathode gas-filled tube, but is unusual in that the cathode, instead of being solid, is made from a pool of liquid mercury and is therefore self-restoring. As a result, mercury-arc valves were much more rugged, long-lasting and could carry much higher currents than most other types of gas discharge tube.Invented in 1902 by Peter Cooper Hewitt, mercury-arc rectifiers were used to provide power for industrial motors, electric railways, streetcars, and electric locomotives, as well as for radio transmitters and for high-voltage direct current (HVDC) power transmission. They were the primary method of high power rectification before the advent of semiconductor rectifiers, such as diodes, thyristors and gate turn-off thyristors (GTOs) in the 1970s.