The most common types of enclosures are:
- Open Drip Proof (ODP)
- Weather Protected (WP1 / WP2)
- Totally Enclosed Fan Cooled (TEFC)
- Totally Enclosed Non-Ventilated (TENV)
- Totally Enclosed Air Over (TEAO)
- Totally Enclosed Forced Ventilated (TEFV)
- XP (Explosion Proof)
Synchronous speed is a significant parameter for the rotating magnetic field-type AC motor. It is determined by the frequency and the number of magnetic poles. Synchronous speed No = [rps, revolutions per second] f = Frequency [Hz]
Definition: Electric motor is the electro-mechanical machine which converts the electrical energy into mechanical energy. The electric motor is mainly classified into two types. They are the AC motor and the DC motor. The AC motor takes alternating current as an input, whereas the DC motor takes direct current.
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft.
The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.
An electric motor is a device converting electrical energy into mechanical energy (generally a torque). This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils.
Calculation for Required Torque ( TM )The required torque is calculated by multiplying the sum of load torque and acceleration torque by the safety factor.
Types of Electric Motors
- AC Brushless Motors. AC brushless motors are some of the most popular in motion control.
- DC Brushed Motors. In a DC brushed motor, brush orientation on the stator determines current flow.
- DC Brushless Motors.
- Direct Drive.
- Linear Motors.
- Servo Motors.
- Stepper Motors.
Basic motors have been classified into three distinct types: AC motor, DC motor, and specialized motors.
The most basic difference is the power source. A.C. motors are powered from alternating current (A.C.) while D.C. motors are powered from direct current (D.C.), such as batteries, D.C. power supplies or an AC-to-DC power converter.
Electric motor is a device that converts electrical energy to mechanical energy. Parts of a Electric Motor. Insulated Copper wire: A rectangular coil of wire ABCD. Magnet Poles: A magnet as placed above ie North Pole and South Pole. This creates a magnetic field as shown above.
Ok, let's take a short overview of twelve most basic motor types used for different industrial electric drives:
- DC Series Motor.
- DC Shunt Motor.
- Cumulative Compound Motor.
- Three phase Synchronous Motor.
- Squirrel Cage Induction Motor.
- Double Squirrel Cage Motor.
- Slip ring Induction Motor.
- Single phase Synchronous Motor.
A DC motor consists of an stator, an armature, a rotor and a commutator with brushes. Opposite polarity between the two magnetic fields inside the motor cause it to turn. DC motors are the simplest type of motor and are used in household appliances, such as electric razors, and in electric windows in cars.
Description. Energy efficient motors use less electricity, run cooler, and often last longer than NEMA (National Electrical Manufacturers Association) B motors of the same size. Thus, a motor that is 85 percent efficient converts 85 percent of the electrical energy input into mechanical energy.
For motors less than ½ horsepower, the code letter on the nameplate represents the locked-rotor kVA. On larger motors, it identifies the locked-rotor kVA per horsepower. Generally, the farther a code letter is from A, the higher the inrush current per horsepower.
Multiply the motor voltage by the full-load current. The result is in watts. Divide watts by 1,000 to give kilowatts. For example, 230 volts x 20 amps = 4,600 watts; 4,600 watts divided by 1000 = 4.6 kilowatts.
The voltage range for which the equipment is designed to operate under the stable condition by giving reliability is known as rated voltage. Thus the rated voltage of any electrical equipment is the highest voltage at which equipment can function within its thermal limit without endangering the life of the equipment.
Calculate power rating in KVA when you know voltage and output resistance. Use the formula: P(KVA) = (V^2/R)/1000 where R is resistance in ohms. For example, if V is 120 volts and R is 50 ohms, P(KVA) = V^2/R/1000 = (14400/50)/1000 = 288/1000 = 0.288 KVA.
In an electric motor, the mechanical power is defined as the speed times the torque. Mechanical power is typically defined as kilowatts (kW) or horsepower (hp) with one watt equaling one joule per second or one Newton-Meter per second. Horsepower is the work done per unit of time.
rated output power: That power available at a specified output of a device under specified conditions of operation.
- Frame Designation (FR) – this is typically a two or three digit number followed by one or more letters that identifies important mounting dimensions.
- Manufacturers Type (TYPE).
- Horsepower Output (kW).
- Time Rating or duty (DUTY).
- Max Ambient Temp.
- Insulation System Designation.
- Speed At Rated Load (RPM).
- Frequency (HZ).
Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor's efficiency tends to decrease dramatically below about 50% load.
Time rating — Standard motors are rated for continuous duty (24/7) at their rated load and maximum ambient temperature. Specialized motors can be designed for “short-time” requirements where intermittent duty is all that's needed. These motors can carry a short-time rating from 5 minutes to 60 minutes.
It starts with the battery in the car that is connected to the motor. Electrical energy is supplied to the stator via the car's battery. The coils within the stator (made from the conducting wire) are arranged on opposite sides of the stator core and act as magnets in a way.
The two main components of this kind of motor are the stator (stationary element) and the rotor (rotating element).
| Approximate Starting Wattage | Approximate Running Wattage |
|---|
| 3/4 Horsepower | 2600 | 850 |
| 1 Horsepower | 3000 | 1000 |
| 1 1/2 Horsepower | 4200 | 1600 |
| 2 Horsepower | 5100 | 2000 |
Inside an electric motor, permanent magnets are set onto a ring surrounding a coil of wire. When the appliance's switch is flicked on, electrons flow through the wire, turning it into an electromagnet. The attractive and repulsive forces of the permanent magnets around it make the electromagnet spin.
Different Parts of an Electric Motor and Their Function
- A power supply – mostly DC for a simple motor.
- Field Magnet – could be a permanent magnet or an electromagnet.
- An Armature or rotor.
- Commutator.
- Brushes.
- Axle.
Engine block components
- Cylinder blocks.
- Cylinder liners.
- Coolant passages.
- Oil passages.
- Crankcase.
- Integrated crankcase.
- Integrated cylinder head.
- Integrated transmission.
What's Inside an Electric Motor? The coil is made of copper wire, because copper is such an excellent conductor. It is wound onto an armature. The coil becomes an electromagnet when a current flows through it.
So, what are these motor component materials made from? Powder metal components for motors generally consist of iron, nickel, and cobalt. Iron is the cheapest of the three, so many designers tend to turn to there first. Cobalt is rarely used on its own, but is sometimes added to iron.
The neuromuscular components of fitness, which enable a person to perform successfully at a particular motor skill, game, or activity. Specific motor fitness components include agility, balance, coordination, power, reaction time, and speed.
