Pyle’s new power inverters

  • No load current draw: <0.2Amp – Low voltage alarm: 10.5v+/-0.5v
  • Low voltage shut down: 10.0v+/-0.5v – High voltage shut down: 15.5v+/-0.5v
  • Built-in cooling fan – Input voltage range: 10v – 15.5v (+/-0.5v) – Output voltage: 115V +/-5V
  • Converting efficiency: >85% – Low voltage / high voltage / overload / thermal protection circuitry
  • Continued Power: 1000W – Surge power: 2000W – Dimension: 11.22”L x 6.93”W x 2.95”H
  • Note:PNV2000 1,000W Continuous & 2,000W Peak watts

People spend a ton of time in their cars now days. With Pyle’s new power inverters you can be more productive, have more fun — and use all the electronics you want in your car or truck. Convert 2000 watts 12-volts DC power to 115-volts AC power safely and effectively in your car with the PNV200 Power Inverter. Power cell phone charger, i-Pods, and other elctronics with this safe and convenient product. Item includes a built-in cooling fan and low-voltage/high-voltage/overload/thermal protection.

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List Price: $ 251.99
Price: Too low to display

An automotive wire required to carry high current with little voltage drop will have a small diameter?

True or False?

Chosen Answer:

You need to have a big diameter, the asnswer is : False.
by: kasab
on: 24th November 12

Increase your productivity with advanced industrial motors? in Motor

If you want to enhance your productivity while running an industry then you must install industrial motors according to the voltage source available in applications. You may find plethora of AC or phase induction motors and DC motors in the market such as schrittmotor (stepper motor), linear motor, brushed and BLDC motor.

Industrialists who crave to enhance their productivity must choose best motors for installation according to the nature and demand of current applications. Before selecting any kind of motor you need to verify the voltage source available in your applications. There are basically two types of voltage source found in electric motors such as alternative current and direct current. After verifying the voltage current you must move on to identify the motor style that can complement with concerned applications easily. People who want to run applications with AC voltage then they must choose to buy phase induction motors. These motors can be classified into different phases such as single phase induction, three phase induction, two phase servo and hysteresis synchronous.

Industrialists who are running applications with DC voltage must install DC motors which are of many types such as schrittmotor (stepper motor), linear motor, brushed and BLDC motor. As the name suggests schrittmotor divides the whole rotation process in different steps like half, full and fractional. It uses magnetic field for its rotor movement and consider relevant voltage source for changing the polarity of poles, applied to its rotor. One can easily afford this motor because it is quite inexpensive as compared to others without compromising with quality.

In brushed Dc motors, people are noticing various errors regarding brush wear and sparking so to avoid such defects BLDC motor is there to serve the need in more efficient manner. They do not contain brushes and need solid state controls and feedback devises for error free operation. It has high starting torques and can easily handle high speed.

As far as linear motor is concerned, it is a device which directs the force in linear motion at a high speed without sending and receiving signals from one part to other. Most of the people demand for motion controller devices like linear actuators, linearantrieb (linear drive) and many others for controlling the motion of machines. While working with a conventional drive, the motion controller sends a signal to servo motor which verifies the movement through making use of rotary encoder or glass scale. After this process, the encoder sends a signal back to the control section that move command has been made. In this way, it takes a lot of time and energy of user so they prefer to use linear drives instead of conventional ones.

So, choose the best industrial motor for enhancing your productivity even more!

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High-performance switches & relays in compact designs in Voltage

Units are becoming smaller and lighter even as makers enhance functionality.

China suppliers of relays and other switches are rolling out smarter, high-capacity solutions in line with the trend for increased automation in vehicles. Such models are typically designed for lighting, wiper, security, safety and diagnostic systems.

In combination switches, the selection now includes a number of designs that support controls for automatically turning headlights on and off depending on ambient lighting conditions. These enable front illumination systems to activate instantly at nighttime and under poor weather conditions.

Several companies have also introduced units that work with sensors to stop windows from rising when an obstruction is detected. Such products help prevent hands and other body parts from being caught in the window’s path and injured.

Meanwhile, relay manufacturers are developing more voltage-sensitive versions for recreational vehicles. VSRs enable automatic charging of the starting and house batteries simultaneously when the cut-in voltage of the former reaches a specific level.

When the voltage drops to a certain point, these devices disconnect the two power sources.

Aopec Automotive Electronics Co. Ltd is among the companies already offering VSRs. Its selection includes units with a cut-in voltage of 13.3 or 25.6V and cut-out voltage of 12.8 or 25.6V.

To support the power requirements of the electronic systems now being fitted into cars and other vehicles, suppliers are releasing more switches with voltage ratings higher than 24V. These products currently account for more than 50 percent of existing designs.

Amid efforts to enhance performance, size remains a key consideration in R&D.

Keeping constructions compact allows a greater number of switches to be fitted into a vehicle should it be needed. Weight is also a concern given fuel efficiency concerns.

Combination types as small as 14.3×7.5×13.8mm, for example, are now available. Versions as light as 15g are offered, while single relays come in 4g constructions.

At several enterprises, visual appeal is also factored into product development. This has yielded units in various hues to match or complement vehicle interiors. Besides black and white, choices now include red, blue and green. Transparent housings in certain shades are also an option.

Some manufacturers have redesigned the structure of their aftermarket models to fit seamlessly into the car.

Releases in coming months will continue to target North America and the EU. A number of companies are also looking into business opportunities in the Middle East, South America and Asia.

 

Read the full report at Global Sources, a leading business-to-business media company and a primary facilitator of trade with China manufacturers and India suppliers, providing essential sourcing information to volume buyers through our e-magazines, trade shows and industry research.

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Specialty Wire and Cables-Different Types of High Performance Wire and Cables in Cable

Wires and cables are primarily used for power distribution and power transmission. Available in various grades and specifications, Wires and Cables can be broadly classified in the following categories.

  • Building wires and cables, including some industrial cables
  • Low voltage cables, flexible cords and fixture wires
  • Special purpose wire and cable

A cable basically is a combination of two wires assembled together to use in electrical purposes. They are durable and available in different structures. Some common examples include Wire Harness, Fire Resistance Cable, Instrumentation Cable, power cable and high voltage cables. These wire and cables can be used either for electrical purposes like current transmitting wires or for non-electric purposes like Wire Harness and Fire Resistance Cables and many more.

Electric wires and cables are available in a number of grades and applications. These wires and Cables find a number of applications in various industries like aerospace and nuclear power plants. Cables and wires are used for numerous purposes. For example coaxial cables, a type of cable designed especially for high frequency and light weight applications.

On the other hand, a conductor flexible cable has versatile applications in differnt industries. Moreover, aerospace cables are manufactured to be tough enough for high speed aerospace applications.

Aerospace cable wires are required to be light weight, small in diameter and be able to withstand rugged environmental conditions. As aircrafts can be exposed to extreme weather conditions, hence these cables and wires need to be durable for safety reasons.

Cables and wires can be broadly classified into following categories:

 

  • Welding Cables- Used for transmitting high currents from electric welding machine to welding tool.
  • Industrial Cables- Used in applications such as refrigerator and washing machines. Besides, they are also used as PCV cables.
  • Aerial Bunched Cables-Used in power transmission because they are really safe and minimize power losses.
  • Multi Core Flexible Cable- These cables find application in chemical industry.
  • Submersible Flat Cables- They have a flat structure and are used in submersible motor pumps installations.

To get strong and reliable Wires and Cables, one can browse different websites of manufacturers engaged in the business. They offer quality product at affordable prices. Although there are several manufacturers, it is advisable to go with the certified ones.

Please Visit Site:-

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  • Durative output power: 1000W
  • Output voltage:110V~130V,Requency:60+/-2HZ,Wavefrom:Modifiled sine wave
  • Output voltage:220V~240V,Requency:50+/-2HZ,Wavefrom:Modifiled sine wave
  • Input Voltage:10~15V/22~25V
  • Undervoltage alarm:10.4~11.0V

Descriptions :
This USB 1000W power Inverter can be operated with your Car Cigarette socket or direct connected with wires clips.
You can operate your home or office electrical devices with this Power, Inverter such as Laptop Notebook Computer, TV, DVDPlayer, Battery Charger, Video Camera, Portable Stereos, Work Lights and more.

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List Price:
Price: $ 55.99

How can I add supplment overcurrent for my relay-transformer?

I’m putting in a 240vac to 24 v relay transformer to hook up an thermostat. Even though it is already on a 20amp two pole circuit breaker in my house out of an abundance of caution I want to add supplemental over-current in the electrical box. To do this I would like to add an extra circuit breaker or fuse in the box but I don’t see any parts to do this?

Chosen Answer:

You can fuse either the high or low voltage side of the transformer, but it is impractical to fuse the 120 volt side of a small transformer, since it would be a very small amperage requiring a special order fuse. You will also not be able to find a small panel mount circuit breaker locally, but you may find one on eBay. That is why they are usually fused.

Find the VA rating on your transformer, or KVA if it is a larger one. If it is shown in KVA, multiply the number by 1000 to get the VA rating. Do not leave out any decimal points. Divide the VA number by 24. This will give you the maximum amperage the transformer is rated for on the 24 volt side. If your are fusing the 120 side, divide the VA by 120 instead.

Install an inline fuse holder with a fuse rated at the amperage you calculated (or as close as you can get without going over) in series with one of the 24 VAC wires. You may have to order the fuse if you can’t find it at an electronics store. The voltage rating of the fuse and fuseholder should be 24 volts AC or DC (automotive is okay) or higher.

If you choose to fuse the 120 volt side instead, the fuse and holder will have to be rated at 120 VAC (automotive not okay) or higher, also.

Many manufacturers oversize the fuse on control circuits to avoid nuisance trips due to inrush currents when using fast-blow fuses. It is not uncommon to see 3 amp fuses used on a 40 VA transformer secondary.
by: KILOWATT
on: 28th October 12

Introduction To Stepper Motors in Motor

Fundamentals of operation

Stepper motors operate differently from DC brush motors, which rotate when voltage is applied to their terminals. Stepper motors, on the other hand, effectively have multiple “toothed” electromagnets arranged around a central gear-shaped piece of iron. The electromagnets are energized by an external control circuit, such as a microcontroller. To make the motor shaft turn, first one electromagnet is given power, which makes the gear’s teeth magnetically attracted to the electromagnet’s teeth. When the gear’s teeth are thus aligned to the first electromagnet, they are slightly offset from the next electromagnet. So when the next electromagnet is turned on and the first is turned off, the gear rotates slightly to align with the next one, and from there the process is
repeated. Each of those slight rotations is called a “step”, with an integer number of steps making a full rotation. In that way, the motor can be turned by a precise angle.
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Stepper motor characteristics

1. Stepper motors are constant power devices.

2. As motor speed increases, torque decreases. (most motors exhibit maximum torque when stationary, however the torque of a motor when stationary ‘holding torque’ defines the ability of the motor to maintain a desired position while under external load).

3. The torque curve may be extended by using current limiting drivers and increasing the driving voltage (sometimes referred to as a ‘chopper’ circuit; there are several off the shelf driver chips capable of doing this in a simple manner).

4. Steppers exhibit more vibration than other motor types, as the discrete step tends to snap the rotor from one position to another (called a detent). The vibration makes stepper motors noisier than DC motors.
5. This vibration can become very bad at some speeds and can cause the motor to lose torque or lose direction. This is because the rotor is being held in a magnetic field which behaves like a spring. On each step the rotor overshoots and bounces back and forth, “ringing” at its resonant frequency. If the stepping frequency matches the resonant frequency then the ringing increases and the
motor comes out of synchronism, resulting in positional error or a change in direction. At worst there is a total loss of control and holding torque so the motor is easily overcome by the load and spins almost freely.

6. The effect can be mitigated by accelerating quickly through the problem speeds range, physically damping (frictional damping) the system, or using a micro-stepping driver.

7. Motors with a greater number of phases also exhibit smoother operation than those with fewer phases (this can also be achieved through the use of a micro stepping drive).

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The Truth About Magnetic Motor Starter in Motor

A magnetic motor starter is a set of contacts who is operated by the electromagnetic in order to start and stop the motor load connected. The control circuit that has transitory contact devices attached to the loop of magnetic starter executes the start and stop task.
The following mechanisms make up the three-pole-voltage magnetic motor starter:
A set of fixed contacts
A set of impermanent contacts
Pressure springs
Solenoid coil
Stationary electromagnet
A set of the magnetic shading loop
Moving armature
A magnetic starter is a full voltage starter designed to give thermal overload as well as under voltage security for collector cage motor and might be remotely operated automatically or through push button post if you are far from the motor. The purpose is to avoid overheating of the motor. The precise gauge of the load in the motor is the current drained by the motor; therefore, it is called an overload device because of its protecting function. If there is excess current drained by the motor, overheating will result.
The principal purpose of the motor magnetic starter is to give thermal overload security; it is not intended to disrupt faulty current A short circuit search must be performed always in order to find out if protection is needed from the faulty current and if something is there is a fault current, a short circuit security must be provided. The holding loop of magnetic starter is intended to fall down every time line voltage goes down below sixty percent of its regular value, thus giving under voltage security to the load or the motor.
It is very essential to keep in mind that magnetic motor starters are contractors who have the accumulation of overloaded relay assemblies that provide operating to overload security into the motor. Selection of thermal load relay is made with the use of manufacturer’s table integrated with the magnetic starter. Furthermore, make sure you are aware of the full load current (FLC) of the motor, service factor (SF) of the motor, and ambient temperature wherein the tool is being activated. Thermal elements are generally based on surrounding temperature of forty degrees Centigrade or one hundred four degrees Fahrenheit.
A magnetic motor starter contains three major contacts used most regularly. These contacts generally are open. This arrangement is used in the start of three-phase motors. The three-phase power is being used by almost all institutional, commercial or industrial facilities in the United States of America. In some areas like in upstate New York and some other regions utilize the two-phase, four-phase wire power. In these cases, you may order 4 regularly open contacts intended for the motor magnetic starter. They can be obtainable in several sizes. The smallest items are just about the sizes of relays, and the biggest starters may take up nearly all the space in a room.
The other kinds of specific magnetic motor starters are the reversing motor starters intended for overturning the motors, and the multi-speed motor starters used for multi-speed specialized motors powered by electricity.

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Supco SPP8E E Series Electronic Potential Relay style Hard Start Kit, Greater than 1 Horsepower Range, 189-227F Capacitor Size

  • Voltage sensing
  • 2-wire installation

600% Boost Start Assist Kit – Benefits: Electronic Potential Relay Technology, Backup electronic timing circuit to protect the compressor, Voltage sensing, Instant re-start, Easy 2-wire connection. Applications: For use on any single phase air conditioning and refrigeration unit. SPP8E Specifications: Operating Voltage: 90V – 277V. Recommended Range: 1 hp to 5 hp and Capacitor: 189 – 227 µF.

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List Price: $ 32.92
Price: $ 18.95