A Variable Frequency Drive (VFD) is a type of motor controller that drives a power electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed drive, adjustable rate drive, adjustable frequency drive, AC drive, microdrive, and inverter.
Frequency (or hertz) is directly linked to the motor’s quickness (RPMs). Quite simply, the faster the frequency, the faster the RPMs go. If a credit card applicatoin does not require a power motor to perform at full speed, the VFD can be used to ramp down the frequency and voltage to meet the requirements of the electric motor’s load. As the application’s motor swiftness requirements alter, the VFD can simply turn up or down the electric motor speed to meet up the speed requirement.
The first stage of a Variable Frequency AC Drive, or VFD, is the Converter. The converter is made up of six diodes, which are similar to check valves found in plumbing systems. They enable current to movement in only one direction; the path demonstrated by the arrow in the diode symbol. For example, whenever A-stage voltage (voltage is similar to pressure in plumbing systems) is definitely more positive than B or C phase voltages, then that diode will open up and invite current to circulation. When B-stage turns into more positive than A-phase, then the B-phase diode will open up and the A-phase diode will close. The same holds true for the 3 diodes on the negative part of the bus. Thus, we get six current “pulses” as each diode opens and closes. That is called a “six-pulse VFD”, which is the regular configuration for current Variable Frequency Drives.
Why don’t we assume that the drive is operating upon a 480V power program. The 480V rating is certainly “rms” or root-mean-squared. The peaks on a 480V system are 679V. As you can see, the VFD dc bus includes a dc voltage with an AC ripple. The voltage operates between approximately 580V and 680V.
We can eliminate the AC ripple on the DC bus by adding a capacitor. A capacitor functions in a similar fashion to a reservoir or accumulator in a plumbing program. This capacitor absorbs the ac ripple and delivers a soft dc voltage. The AC ripple on the DC bus is normally less than 3 Volts. Hence, the voltage on the DC bus becomes “approximately” 650VDC. The actual voltage will depend on the voltage level of the AC line feeding the drive, the level of voltage unbalance on the power system, the electric motor load, the impedance of the power program, and any reactors or harmonic filters on the drive.
The diode bridge converter that converts AC-to-DC, is sometimes just referred to as a converter. The converter that converts the dc back to ac is also a converter, but to tell apart it from the diode converter, it is usually known as an “inverter”. It is becoming common in the industry to refer to any DC-to-AC converter as an inverter.
Whenever we close one of the top switches in the inverter, that phase of the engine is linked to the positive dc bus and the voltage on that phase becomes positive. When we close among the bottom switches in the converter, that phase is linked to the negative dc bus and becomes negative. Thus, we can make any phase on the motor become positive or unfavorable at will and may therefore generate any frequency that we want. So, we can make any phase maintain positivity, negative, or zero.
If you have a credit card applicatoin that does not need to be run at full quickness, then you can cut down energy costs by controlling the electric motor with a variable frequency drive, which is one of the advantages of Variable Frequency Drives. VFDs permit you to match the quickness of the motor-
The aluminium housing benefits weight reduction for more convenient applications and transportation.
The simple style allows both foot or flange mounting to standard unit, reducing stocking levels and allowing quick delivery.
The closed insight flange is an integral part of the variator casing for easy installation and prevents likelihood of oil leaks.
The magnetic breather plug maintains a clean lubricant and extends maintenance intervals.
The oil bath operation provides high efficiency for noiseless and vibration free running.
The machine can operate in both directions, input and output shafts rotate in the same direction.
14.6 UDL performance table for UDL Series Swiftness Variator (N1=1400R/MIN)
UDL series planet cone-disk stepless mechanical variator can be a fresh generation of products developed by ourselves on the basis of advanced technology. BV series stepless mechanical variator are widely used for conveying, ceramics, packing, chemical, textile, foodstuffs, medicine, printing, rubber, Machine-tools, and all sorts of automatic creation lines, pipelines and assembly lines which require speed-reuglation, etc. Its primary features are follows:
1,High speed-regulating precision: up to 0.5i<<1 rotation
2,Huge speed-changing range: The speed ratio ranges from 1/1.4 to 1/7 freely.
3,High in strength and long in service life.
4,Smooth in driving, low in noise, stable in functionality, continuous in operating and front-to-back in operating direction.
5,Convenient to modify the speed, and small in structure and little in volume.
6,Complete in sealing and suitable for any environment.
7,Easy in adaptation: it can be combined with all types of speed reducers, as to achieve low stepless speed-changing
8,Made of high-quality aluminium alloy diecast in forming, good-looking to look at, light in weight and it never gets rusty.
The design of UDL series stepless speed variators of EVER-POWER draws on the advanced technology both home and broad. The stepless variator is constructed of high-quality aluminium alloy die-casted gearbox which can be never get rusty and assure the top quality and it is definitely equipped with a concise structure which is little in quantity and light in weight and will save the mounting space in set up. What’s more, the stepless velocity varistor is suitable for continuous procedure and the speed can be changed based on the real require. It features realiable performance, a large quickness variation range and realible velocity adjustment.
The EVER-POWER stepless speed variator is features with high speed-regulatingaccuracy which is up to 05 – 1 rotation.
The ratio rangeis huge and the output ratio could vary from1:1.4 to at least one 1:7 freely.
3. The stepless speed variator operates continuously for a long time and it might run in front-to-back freely.
With a fully sealed structure, the UDL series speed variator is suitable for wet, dusty, lightly and corrosive environments.
Good adaptablity
UDL series stepless velocity variators of Taiqi could be effectively coupled with various kinds of speed reducers, such as for example cycloid speed reducers, and RV worm equipment speed reducers to be able to reduce the raise the output torque and achieve numerous output speed in various occasions.
High strength
When the influence load is reversed, the device has reliable performance which can drive accurately without recoil.
Superior performance
All transmission parts of this group of gearboxes are strictly prepared, precision machined, ground, contacted and also have good lubricating performance.
The UDL series stepless speed varitators of EVER-POWER are trusted in food machinery, E-printing, electronics, leather tanning, chemical, textile, papermaking machinery, rubber machinery, plastic machinery, pottery ceramic machinery, pharmaceutical machinery and various work production lines.
Ever-Power provides a cost-effective group of spur gearboxes featuring sintered steel gears to best complement our motors. These gearboxes, when put into Ever-Power motors, offer greater flexibility to the developer for low duty applications. Spur gearboxes offer an offset output shaft and are offered with sleeve or ball bearings, optional lubricants for intense temperatures, and Delrin gears for reduced noise. Shortened housings are for sale to select ratios.
Ever-Power also offers a number of planetary gears with different ratios and stages. The planetary series offers a centered output shaft for servo and constant duty power transmission applications. Planetary gearboxes can be found with plastic or metallic gears and can be customized with sleeve or ball bearings on the input and output shafts.
UDL series stepless velocity variators are trusted for foodstuffs, ceramics, packing, chemical substances, pharmacy, lastics, paper-making, machine-tools, and all kinds of automatic lines, pipelines and assembly lines which need rate regulation.
1. High speed-regulating ,with precision: up to 0.5-1 rotation.
2. Large quickness -changing range: The quickness ratio ranges from 1:1.4 to 1 1:7 freely.
3. High in strength and long service life.
4. Convenient to regulate the speed.
5. Constant in running, front-to-back again in running direction, soft in driving, stable transmission with lower noise.
6. Fully sealed and suitable for different working temperature
7. Compact structure and small volume.
8. Aluminium alloy and cast iron housing
9. Wide range of adaptation. UDL series stepless speed variators could be combined with all sorts of speed reducers,so as to accomplish low stepless quickness changing.
esign of UDL series stepless transmitting, integration of the domestic and foreign advanced technology, the product has the following main features:
1, quickness and high precision: 0.5-1.
2, large rate range, the output quickness ratio may differ from 1:1.4 to at least one 1:7;
3, high strength, long service life.
4, convenient speed.
5, constant work, and may be both positive and negative path of operation, stable operation, stable overall performance, low noise.
6, full seal, low requirement to the environment.
7, compact structure, small volume.
8, uses the top quality light weight aluminum alloy die-casting molding, beautiful appearance, light weight, never rust.
9, good adaptability. UDL series stepless acceleration variator with all types of reducer combination, achieve low-speed cvt.
UDL series stepless swiftness change device can be trusted in food, chemical, pharmaceutical, packaging, plastics, paper, machine tools, transportation and various required speed automatic production line, transport
Assembly line, is your ideal partner machine.

Please do not hesitate to call us if you have any confusion about Udl Speed Variator.