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Monthly Archive: April 2017

AC and DC Industrial Motors Are All Around Us

Whether you are a homeowner who’s handy at fixing things around the house or an experienced technician who works with various types of machinery, at some point you will work with industrial motors. You can find them with various horsepower, speeds, voltage, frames, enclosures, and mountings depending on their various uses. Two of the most common engine types are AC and DC, referring to engines that utilize alternating current and direct current, respectively.

AC Engines

This is one of the most common and simple industrial motors, sometimes known as a “squirrel cage” motor. Features include the following:

A Simple Design: This machine is made of three windings in the exterior section with a simple rotating section, called the rotor. The AC line voltage causes the rotor to rotate around the axis. Its speed is dependent on only three things: the fixed number of poles, or electromagnetic winding sets, built into the motor; variable speed drives, commonly known as inverters or amplifiers, that change the frequency of the AC line voltage; and the amount of force or load on the machine. Changes in speed are expected when the load changes.

Low Cost: AC industrial motors are the most affordable engines available if you need more than 325 watts of power, mainly because of their simple design. You can find them in air conditioners, washers and dryers, fans, blowers, vacuum cleaners, and many other products. Because they are so widely used, you won’t have any trouble finding a replacement when needed.

Reliability: Because of the simple design, AC engines are also very low maintenance. There are no brushes to replace and the bearings could last several years or even a decade or more.

DC Engines

DC Engines are preferred in most variable speed and load control applications. Features include the following:

An Understandable and Cost-Efficient Design: A permanent magnetic field is created in the stator, or stationary section, of the motor by either permanent magnets, which are common in fractional horsepower applications, or electromagnetic windings, which are used in applications that need five or more horsepower.

This makes this type of engine easy to design and manufacture. Some of the lower horsepower models are available from $50 to $100.

Speed Control: With this type of machine, controlling the speed is simple. The higher the armature voltage, the faster the rotation, which means a faster speed. The voltage will increase in conjunction with the horsepower. Most DC industrial motors will perform well over a speed range of 20:1, down to approximately 5% to 7% of the base speed. They are designed with variable speed operation in mind, so they have heat control features that allow lower operating speeds.

Load Control: The load, or torque, control is simple. The output torque is proportional to the current, so if you limit the current, you limit the torque it can take. This is one reason why these DC engines are used for applications such as textile manufacturing.

Industrial motors are all around us; homeowners use them whenever they use appliances and power equipment, while a technician may repair several a day. Chances are you’ll use an AC or DC engine before the day is over!

Why Used Car Dealerships Are Not All The Same

postUsed car dealerships have dramatically evolved from the stereotype of the latter part of the 20th century. As buyers have become more sophisticated and the market more complex, the purveyors of previously owned vehicles have become more specialized to meet the demands of their demographics and area. Different business models have been adopted as the industry expands and competition increases.

Types of Dealers

Used car dealerships can be separated into different classes depending on the features and business structure of each operation.

Chain Companies

These are large, nationally syndicated enterprises that provide inexpensive transportation options to the local community. The warranties offered are more comprehensive than the other options. The vehicles offered are usually of a higher quality due to the more rigid, standardized checks performed before being placed on the market.

Chain operations may not have the same pricing flexibility, due to corporate standards, so that can limit the amount of negotiation flexibility that a sales person may have during the sales process.

Independent Lots

This type of dealer follows a more traditional model of used automobile sales. The business is typically locally owned and caters to the needs of the community. Price flexibility is a key component in this type of operation. The sales staff have a greater deal of leeway in negotiating and, as a result, the consumer can often find much lower prices here than from the nationally syndicated dealers.

The trade off is that the quality of vehicles is often much lower and the warranties offered might be limited, both in scope and in length. For those only looking for daily transportation, utilizing the services of an independent mechanic prior to purchase can help the potential buyer make a more informed decision.

Franchise Establishments

A franchise scenario is much like a hybrid between the chain companies and independent lots. A local enterprise is authorized by the national “parent” to feature vehicles under the corporate banner. Being locally owned (as opposed to being run by a national company), pricing is often more flexible and can be tailored to the particular community’s needs.

Franchise operations will generally offer certified pre-owned cars and trucks that have met the rigid quality control standards dictated by the national corporation. However, because they are locally owned, the marketing of the inventory is left to the dealer/owner to dictate price points and negotiation flexibility. As a result, the franchise model is somewhere in the middle of the previously mentioned dealers.

Choosing between the types of used car dealerships is a matter of personal requirements for transportation needs. Considerations such as price, warranties offered, brand loyalty, even dealer attitude and reputation all are factored into deciding the best place to select and, ultimately, purchase a pre-owned automobile or truck.

Effects of Engine Oil on the Fuel Economy of a Car

postThe type and quality of a car’s engine oil can make a drastic change in the fuel economy of your beloved car.

Here is a brief guide to help you pick the right oil for your car.

There are many ways to improve the fuel economy of your car while driving steadily and no sudden accelerations to inflating your car at the right pressure. You should also know that car engine oil also contributes as a major factor in helping your car reach the extra mile without any extra costs.

There are three kinds of oil available in the market:

a) Mineral oil

b) Semi-synthetic oil

c) Fully-synthetic oil

Normally, mineral oil is the regular oil that lubricates your engine, but requires frequent changing. Semi-synthetic have minute polymers inside them that reduce engine wear and tear and also help protect the engine from cold damage and cold-starts. Fully-synthetic oil enhances performance of the engine by reducing carbon build-up and has excellent, ability to avoid cold-starts.

Which Oil Is Right For Me?

To choose the right oil for yourself, you should always look at the car’s engine manual for recommended oil and make. Apart from that, your car mechanic will also suggest you the best oil based on the car and the conditions you drive in.

For most buyers, the fully-synthetic one is the best since it proves economical in the long run and does not require changing as frequently as the mineral oils do. Since these are manufactured in specialized labs by adding additives to the basic oil, they are able to provide performance, engine longevity and better efficiency.

However, there are more factors you should consider, like:

1) Oil Quality

There are dozens of brands in the market, but the oil rating labelled on the container, like 5W30 tells you that this kind of oil can work in both high and low temperatures. The W tells you the winter rating and the second number tells you the summer rating. Fully synthetic ones are meant for winter conditions mainly.

Similarly, the brand should also be of repute. Do not opt for any unknown brand.

2) Viscosity Level

Thicker or thinner oil is what matters most. The lower viscosity oils work best and should be used in your car. Oils that are thinner work the best in cold conditions and turn thick when conditions become warmer. You can also go for multi-grade oils that have extra polymers in them that activate only when the oil gets heated up, unless they keep the oil thin.

3) Car Servicing Intervals

Always follow the oil change interval diligently! These oils can last only up till the time the manufacturer prescribes for them. After that, they will kill your engine slowly. Do not use oil more than its intended life; your engine may clog beyond repair.

So, always go for oil change when it is due since it increases the life of your engine and helps it perform at an optimum level.