Motor control center

What is MCC ?

A motor control center (MCC) is an assembly to control some or all electric motors in a central location. It consists of multiple enclosed sections having a common power bus and with each section containing a combination starter, which in turn consists of motor starter, fuses or circuit breaker, and power disconnect.

A motor control center can also include push buttons, indicator lights, variable-frequency drives, programmable logic controllers, and metering equipment. It may be combined with the electrical service entrance for the building.

MCC's are typically found in large commercial or industrial buildings where there are many electric motors that need to be controlled from a central location, such as a mechanical room or electrical room.


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Google Home is a brand of smart speakers developed by Google. The devices enable users to speak voice commands to interact with services through Google Assistant, the company's virtual assistant. Both in-house and third-party services are integrated, allowing users to listen to music, control playback of videos or photos, or receive news updates entirely by voice. Google Home devices also have integrated support for home automation, letting users control smart home appliances with their voice. The first Google Home device was released in the United States in November 2016, with subsequent product releases globally from 2017–2019.

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What exactly is Profibus-DP

What exactly is Profibus-DP ?

 It's very simply explained  , very helpful and made thing more clear about the Profibus-DP.

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Power in Motors

Power in Motors

AC motors are either single-phase or three-phase. For a single-phase motor, the electrical input power is given by Equation (A).

 (A) Pin = VIcosθ  V is the rms line voltage, I is the rms line current, and cosθ is the power factor.
 As we learned in the lesson on three-phase,

 (B) Pin = √3 VIcosθ  The output mechanical power is:

 (C) Pout = Toutωm  Pout is the output mechanical power, Tout is the output torque, and ωm is the angular frequency of the shaft.

 (D) Pin = Pout + Ploss 
Ploss refers to the copper, eddy current, hysteresis, friction, and windage losses.
Pout is usually given in horsepower (746 W/HP). The efficiency of a motor (η) is the ratio of the powers:

 (F) η = Pout/Pin
Typical values for industrial motors are between 85% and 95%. It should be understood that these efficiency are for full load. Efficiency decreases significantly for light loads.

 Since motor speeds are usually given in rpm rather than shaft angular frequency, conversion is frequently necessary:

 (G) ωm = nm(2π)/60  nm is the motor shaft rotation in rpm.

What is a VFD ?

What is a VFD ?

Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed drive, adjustable speed drive, adjustable frequency drive, AC drive, microdrive, and inverter. Frequency (or hertz) is directly related to the motor’s speed (RPMs). In other words, the faster the frequency, the faster the RPMs go. If an application does not require an electric motor to run at full speed, the VFD can be used to ramp down the frequency and voltage to meet the requirements of the electric motor’s load. As the application’s motor speed requirements change, the VFD can simply turn up or down the motor speed to meet the speed requirement.