Essential learning about induction motors – basics of AC drives and VFD

PID controller – a PID is the most commonly used feedback controller. A PID controller calculates an “error” value as the difference between a measured process variable and a desired set point. The Pid controller attempts to minimize the error by adjusting the process control inputs. The PID controller calculation involves three separate constant parameters, and is accordingly sometimes called three-term control: the proportional, the integral and derivative values, denoted P, I, and D. .

Auto tune controller – Auto tune controller provide economical control for a wide variety of processes, including heating, cooling, and heat/cool. When auto tune controller is used with the proper transmitters, these devices can also control pressure, flow, humidity, motion, or pH. The front panel is NEMA 2, 3R, and 12 rated for waterproof protection and are corrosion resistant. The sophisticated design of auto tuner controller incorporates the latest microprocessor and surface mount technology, compressing an unprecedented number of standard features into a compact 1/16 DIN package. The user can program control functions from the front panel; input types are DIP switch selectable. Multiple tuning modes allow the user to select from 3 standard tuning presets, manual tuning, or auto tuning.

Electronic motor drives into two categories: AC and DC. A motor drive controls the speed, torque, direction and resulting horsepower of a motor. A DC drive typically controls a shunt wound DC motor, which has separate armature and field circuits. AC drives control AC induction motors, and-like their DC counterparts-control speed, torque, and horsepower. A VFD controls the speed, torque and direction of an AC Induction motor. If you are not using VFD you are wasting energy and throwing money out the window. An AC drive may be considered by them as the variable frequency inverter and motor combination. It may even include the motor’s pulley.People in the electrical field and electrical suppliers usually refer to a variable frequency inverter unit alone, or an SCR power module alone (when discussing DC drives) as the “drive” and the motor as the “motor”. Manufacturers of VFD used to refer to the drive as an “adjustable speed AC drive”. To make matters worse when a motor is included in the package it may be referred to as an “adjustable speed AC drive system”.

A VFD is an adjustable speed drive. Adjustable speed drives include all types; mechanical and electrical. About AC drives, the main power components of an AC drive have to be able to supply the required level of current and voltage in a form the motor can use. The controls have to be able to provide the user with necessary adjustments such as minimum and maximum speed settings, so that the drive can be adapted to the user’s process.

Injection Moulding Controller – Manufacturers of Injection Moulding Controller provide total closed loop control for any Injection molding controller.

Electric motors for your electric car

When selecting an electric car motor you have two choices. DC or AC electric motors. DC motors are powered by Direct Current (a battery is an example of direct current) you will need to find what is called a series wound DC Motor. Most DC motors operate from 96 to 192 volts.

AC Motors work off of Alternating Current. AC motors suitable for an electric car are usually three-phase 240VAC types, requiring a 300 volt battery pack.

DC motors have advantages over AC motors in cost and battery pack voltages. Since the DC motor runs at a lower voltage than the AC motor you can use the 6 volt golf cart style of battery. They do require more current than their AC counterparts but the 6v battery happens to have the best capacity rating so this should not be a problem. AC motors, although costing more, do have distinct advantages over the DC motor. For one, they can use the back emf from the motor while the car is braking to recharge the batteries. This causes the AC motor to be more efficient Although they require a higher battery pack voltage, around 300 volts, they use less current than the DC motor and therefore can use the lower capacity 12 volt batteries for their battery pack.

Both types of motors need a motor controller to operate, and once again due to the complexities involved, an AC motor controller is much more expensive than a comparable DC motor controller. Many times you can find very inexpensive sources of motors by shopping around. Due to regular maintenance schedules many industrial areas will have businesses that throw out working motors on a routine basis, which could be a gold mine if you can find and talk to the right person in charge.

Another great source is eBay. Just go to eBay and do a search for DC or AC motor, and you will find many sources to choose from. When selecting an electric car motor you need to do your homework. Many factors come into play such as cost, type of car you are converting, and don’t forget about how much space you have under the hood. Proper planning goes a long way for a successful electric car conversion.

Electric Vehicle Motors

Youve decided to build your own electric vehicle and now you need to learn about electric vehicle motors.

There are many considerations in choosing which one to install.

What do you need to know to get started?

DC or AC- the choice is yours

How big of a motor do you need?

Detailed plans on how to build an electric car- electric vehicle motors

Do you choose a car or truck?

Lets start with the vehicle you will use. There are some basic considerations you need to remember but mostly vehicle weight and battery capacity are your main concerns.

Basically the lighter the vehicle the farther it will be able to travel between charges. That means installing electric vehicle motors in a small car or truck is your best choice. This must be balanced with total battery capacity too, since the more batteries, the longer your vehicle range will be.

We have chosen small trucks for most of our latest conversions as they are light, strong and have lots of room for batteries making it a good choice for installing electric vehicle motors.

Which motor should you choose?

Most of the large car companies are installing large AC motors in their electric vehicles. AC is light for its power output and they have a powerful charging device that works off of your braking system when the AC motor is slowed down that energy is actually transferred to the batteries.

The two drawbacks to those motors are that they are more difficult to install compared to DC and more expensive.

For that reason we have chosen DC electric vehicle motors for our recent conversions. They are easier to install and cheaper too.

The plans we found also showed us where to find them for free- and deep cycle batteries from the same source too. That really saved us a lot of money.

Since electric vehicle motors will last a very long time, probably through 2 vehicles obtaining used DC motors is a good choice for the conversion. Good recycled motors are all around if you know where to look.

Motors in the 9 to 13 inch range work best and has lots of power.

Choosing the right vehicle and obtaining free parts will definitely keep the cost of the project down too.

The first time you drive by a gas station after you do your conversion you wont be able to stop smiling.

Did you know that gas prices are expected to rise to $7 per gallon next year?

Isnt it time you did your own conversion? Lets get started.

Learn about Electric Vehicle Motors is a great place to start and learn how you can save lots of money on your gas bills for the future and help the environment in the process.

Homemade Power Plant – Make Your Magnetic Motor

Have you ever wanted to make your own electricity? A home made power plant can be a fun and educational project that helps to reduce monthly expenses. With just a few items and a little patience you can build your magnet motor.

A magnetic generator is an electromechanical device that creates an electric current from mechanical motion. A coil of tightly wrapped wires, surrounds a series of magnets that are free to rotate about an axis in the middle of the coil. In the presence of a changing magnetic field, called flux, an electromotive current is produced that can power electric devices. The type of current produced is Alternating Current and is the class found in any home outlet.

A person can either choose to physically design the alternator/generator, or can use an existing one and install it within a production and storage system that is designed by the user. This can be done inexpensively and with a little patience.

The electric current comes from the changing magnetic field as a result of the spinning magnetic core in the alternator. Similarly, some people may opt to use a dynamo to produce direct current. This would necessitate an inverter to change the type of current for everyday use. Any thing can be used as the mechanical drive, whether bicycle or windmill, if it turns the shaft should work.

For the purposes of most common electronics alternating current (AC) is favored as it is the common type of power available in houses. Power stored in a battery is available to use only as direct current (DC). In this case an inverter needs to be installed that converts DC current to AC current.

To feed the generated power back into the power grid, the battery bank must be wired to the house fuse box. This can be a dangerous job if the person is not experience in electric work. For this part it may be a good idea to seek a professional electrician. The benefit of this work, is that you can actually sell the excess power generated back to the local power company.

A magnetic energy generator, more appropriately called an electric generator, can help you be a part of the green economy. In addition can prove to be educational experience that sheds light on how technology works. A person should do their homework before starting this project and consult a professional when necessary.