Showing posts with the label
Electric Motors
Every 3 phase motor has six (6) terminals with the supply voltage connected to three (3) of those terminals. The most common configuration of a three-phase motor is the Delta (∆) – Star (Wye) conf…
A hazardous environment or location is some combustible materials that could easily ignite and create a fire hazard. Electric motors operated in such an environment need to be carefully specified…
The two most important factor to consider when selecting an electric motor are: 1. The electricity supply to which the motor will be connected - AC or DC. If AC three phase or …
Are you working with electric motors or there is the need to specify motors and you need to know what standard applies to what area of electric motors? The table below will be of great help as it …
The diagram below shows all the basic parts that makes up an AC induction motor. These basic parts work together to ensure the smooth performance of this highly efficient electrical device: Part…
Enclosures of electrical equipment, per characteristics where they will be installed and their maintenance accessibility, should offer a certain degree of Protection also known as Ingress Protecti…
To prolong the life of electrical systems and motors, regular insulation resistance testing is required. Over the years, after many cycles of operation, electric motors are exposed to environmen…
NEMA motor insulation classes describes the ability of motor insulation in the windings to handle heat. There are four insulation classes in use namely: A, B, F, and H. All four classes identify…
Understanding the relationship between the load carried by an AC motor and the torque it develops during each stage of operation of the motor is crucial to selecting the right kind of electric mot…
Synchronous Speed When Alternating current (AC) is applied to the stator of a three phase motor, a rotating magnetic field is setup. This rotating magnetic field moves with a speed called synchr…
The electrical power supplied to an electric motor is converted into mechanical power for powering various loads such as pumps. The power output can be rated in KW (kilowatts) or Horsepower (HP). …
Three phase induction motors are specified by their electrical design type. NEMA (National Electrical Manufacturers Association) has classified three phase AC motors into design A, B, C, D. A more…
The service factor (SF) of an AC motor is a measure of continuous overload capacity at which a motor can operate without overload or damage, provided the other design parameters such as rated vol…
When an electric motor is used in an atmosphere with explosive gas, the motor surface might become hot enough to cause auto-ignition. Auto-ignition temperature is the temperature at which a gas…