Ohm Variable
Todays deals on Ohm Variable?
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NOS Siemens 300 Ohm 500W Variable Resistor $199.00 |
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1000pcs,3296 201 200ohm Variable Resistor Precision NEW $178.00 |
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1000pcs,3296 101 100ohm Variable Resistor Precision NEW $178.00 |
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1000pcs, 3296 501 500ohm Variable Resistor Precision $178.00 |
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Ohmite 100ohm wire wound Variable Resistor nonprecision $130.00 |
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5pcs Multi-Variable Oil Pot / Resistor PPMM-1 1.1 Ohm Russian $99.95 |
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Ohmite RNS100R 100 Ohm 1.73 Amp Variable Wire Wound Resistor $99.99 |
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High Precision 3266W Variable Resistors 5K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 10K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 2K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 200K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 50K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 100K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 1K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 20K Ohm 350pcs $101.11 |
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High Precision 3266W Variable Resistors 500K Ohm 350pcs $101.11 |
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Telonic Berkeley Variable Attenuator Model # 8121S-110 0-60 dB 50 ohm 0-2 Ghz $99.95 |
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VARIABLE RESISTOR 500 OHM # RP111FD501KK 5905006657855 $99.95 |
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Bourns Variable Resistor 5 K ohms # PCWID-C28-BAD502 $39.99 |
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High Precision 3362 Variable Resistors 5K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 10K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 5K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 20K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 2K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 1K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 50K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 20K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 10K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 2K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 50K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 200K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 100K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 200K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 1K Ohm 350pcs $68.86 |
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High Precision 3296 Variable Resistors 500K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 500K Ohm 350pcs $68.86 |
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High Precision 3362 Variable Resistors 100K Ohm 350pcs $68.86 |
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POT 1K OHM CERM 2W +/-100 PPM 3683S-1-102 Potentiometers Variable Resistors $59.99 |
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25x Bourns Variable Resistor Film 500Ohm 10% 1/2W $50.00 |
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Ohmite D75K50R 50ohm Variable resistor $49.95 |
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Ohmite D100K50R 50ohm Variable resistor $49.95 |
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1000,103 10K OHM Variable Resistors potentiometer New m $55.00 |
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1R 250W 1 OHM VARIABLE HIGH POWER LOAD RESISTOR NEW fd1j $39.29 |
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50 OHM VARIABLE ROTARY ATTENUATOR SILVERPLATED PREH HQ VERY RARE! $44.00 |
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Clarostat Variable Resistor 43C2 – 50 K Ohms- 2 Watt (lot of 6 units) $34.99 |
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Carter Variable Resistor Type 136C-232 20K-ohms $49.95 |
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Mil-Spec Betatronix Variable Resistor Part # XLF7718 $300 40k Ohm $49.95 |
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High Precision 3266W Variable Resistors 200K Ohm 150pcs $45.44 |
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1861 NEW OVALSTRAPPING INC RGH10A1G 30 Ohm Variable Res $39.85 |
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Clarostat Variable Resistor RA20NASD-250 Ohms- 2 Watts (lot of 5 units) $34.99 |
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NOS Ohmite Dividohm 0589 50W 60000ohm Variable Resistor $34.95 |
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High Precision 3266W Variable Resistors 20K Ohm 150pcs $41.38 |
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High Precision 3266W Variable Resistors 100K Ohm 150pcs $41.38 |
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High Precision 3266W Variable Resistors 2K Ohm 150pcs $41.11 |
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High Precision 3266W Variable Resistors 50K Ohm 150pcs $41.11 |
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Ohmite 10pak D12K25 12watt 25ohm Variable resistor $32.95 |
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(8) NOS CTS VARIABLE RESISTORS POTS AW-4193 68OHM 5W $34.95 |
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High Precision 3266W Variable Resistors 5K Ohm 150pcs $40.84 |
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High Precision 3266W Variable Resistors 10K Ohm 150pcs $40.84 |
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High Precision 3266W Variable Resistors 1K Ohm 150pcs $40.84 |
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High Precision 3266W Variable Resistors 500K Ohm 150pcs $40.84 |
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GENERAL RADIO CO. VARIABLE RESISTOR TYPE 471-A OHMS 200,000 $29.99 |
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MIL-SPEC Variable Resistor Model # 3212-2603 Part # RR4000C2A9G101 100 ohm $39.95 |
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TEKTRONIX 311-1321-00 RESISTOR, VARIABLE 20K OHM NEW IN BOX UNUSED SURPLUS $35.00 |
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Res inc. 0.2 ohm Variable Tubular Resistor $25.95 |
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100pcs 50K ohm Trimmer Trim Pot Variable Resistor 3296 (50 K ohm) $32.99 |
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100pcs 100 ohm Trimmer Trim Pot Variable Resistor 3296 (100ohm) 100R $32.99 |
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100pcs 500 ohm Trimmer Trim Pot Variable Resistor 3296 (500ohm) 500R $32.99 |
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100pcs 200 ohm Trimmer Trim Pot Variable Resistor 3296 (200ohm) 200R $32.99 |
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100pcs 50 ohm Trimmer Trim Pot Variable Resistor 3296 (50ohm) 50R $32.99 |
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100pcs 5K ohm Trimmer Trim Pot Variable Resistor 3296 (5 k ohm) 5000 ohm $32.99 |
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NOS 50K Ohm Variable Wire-Wound Non-precision Resistor 40 Watts $25.00 |
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200W 5 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 10 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 20 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 30 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 50 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 100 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 200 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 300 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 500 OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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200W 1K OHM High Power Wirewound Potentiometer, Rheostat, Variable Resistor. $32.00 |
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100pcs 200K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 500K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 10K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 1K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 1M ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 2K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 100K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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100pcs 20K ohm Trimmer Trim Pot Variable Resistor 3296 $31.34 |
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High Precision 3362P Variable Resistors 100K Ohm 150pcs $30.95 |
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High Precision 3362P Variable Resistors 5K Ohm 150pcs $30.95 |
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High Precision 3362P Variable Resistors 200K Ohm 150pcs $30.95 |
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High Precision 3362P Variable Resistors 1K Ohm 150pcs $30.95 |
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7481-3-0 BI Technologies Resistor, Variable, 2K ohm, same as Tektronix 311-1531- $20.00 |
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150W Watt 5 Ohm Ceramic Disk Variable Resistor Rheostat $30.15 |
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Wirewound Variable Resistor 150 Ohm 150W Ceramic Disk Rheostat $30.15 |
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10 Ohm 150W High Power Ceramic Rheostat Variable Resistor $30.14 |
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20 Ohm 150W High Power Ceramic Rheostat Variable Resistor $30.12 |
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50 Ohm 150W High Power Ceramic Rheostat Variable Resistor $30.11 |
Ohm Variable Questions
What is a Medium Voltage (MV) AC Drive (Frequency Inverter)?
What is a Medium Voltage (MV) AC Drive (Frequency Inverter)?
Don’t feel bad about being confused by “medium voltage drives” terminology. It’s a confusing because it sounds like a technical term, but really it’s marketing driven. Actually, there are two terms that can be confusing to anyone new to the field of automated control of electric motors.
Let us start with the word “drive.” Also sometimes called an inverter, a drive is essentially a power amplifier that puts out the electric power needed by an electric motor based on the torque and/or speed called for by the controller, which is a digital computer tasked with overall system control. As the industry has shifted in favor of variable-speed drives, the role of the drive has become more important.
Variable-speed motor/drive combinations use a synchronous ac motor with an encoder built in. The encoder signals the motor’s speed and phase angle to the drive, which must then match its output frequency to the motor speed and its output phase to produce the required torque.
To get the drive’s power efficiently out to the load as mechanical power requires having enough voltage to drive enough current through the motor. The output power is, after all, the product of voltage times current. The ratio of the voltage to the current, on the other hand, defines an impedance for the drive/motor combination.
Copper resistance in the motor coils and power cables, as well as contact resistance in all the connections rob the system of power, however. The higher the circuit impedance compared to these parasitic impedances, the more efficient the overall system will be.
The graph below compares motor/drive impedance to a typical parasitic impedance level of one Ohm. Assuming we want the ratio to be one or two orders of magnitude, the chart shows how the supply voltage needed correlates with output power. Small, fractional horsepower motors (red line) work well from a few tens to a few hundreds of Volts. Larger motors require hundreds of Volts to run efficiently. As horsepower requirements climb, so do the drive voltage requirements.
What really drives people crazy is the term “medium voltage drive.” It is a purely marketing term. From zero to 600 V is called “low voltage (LV).” “Medium voltage (MV)” is 600 V and above. There is no “high-voltage (HV)” designation.
Comparing this 600 V cutoff to the chart shows that low-voltage drives provide good efficiency up to several horsepower (10,000 W). Above 10 kW, however, medium voltage drives are needed. Voltages above a few thousand Volts, however, are needed only for the relatively few electric motor applications requiring hundreds of horsepower. Most applications requring that much mechanical output are currently served by internal combustion engines.
About the Author
Engineers and sales of frequency inverters, ac drives in China
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