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Every mechanical structure has a frequency at which it vibrates most easily when slightly disturbed; this is called the natural frequency. The sound you hear when you tap a glass w... More Details

An electric motor cannot convert all the electricity it draws into mechanical power; some of it is inevitably turned into heat. For a single motor this heat may seem small, but in ... More Details

Brake electric motors are indispensable in applications that must stop quickly and safely the moment stopping is required. Cranes, elevators, conveyors, door systems, and machines ... More Details

An electric motor produces a certain amount of vibration while running; this is unavoidable. However, the severity of the vibration says a great deal about the motor's health. Low ... More Details

The only reliable way to understand how efficiently an electric motor truly runs is to measure it. The efficiency value printed on the nameplate is a reference obtained by the manu... More Details

The power and efficiency values printed on an electric motor's nameplate do not, on their own, tell you how the motor will behave in the real world. A motor heats up while running ... More Details

A three-phase induction motor works exactly as designed when all three phases are supplied with voltages of equal magnitude and a precise 120-degree phase angle between them. This ... More Details

In industrial facilities that contain flammable gases, vapors, or combustible dust, selecting an electric motor goes far beyond a simple calculation of power and efficiency. In the... More Details

Direct-on-line starting is the oldest and simplest way to start an induction motor. The motor is connected directly to the line through a contactor and is suddenly energized at ful... More Details

The efficiency of an electric motor is not a fixed value; it changes with operating temperature. As temperature rises, the electrical resistance of the winding copper increases, wh... More Details

Belt-and-pulley drive is one of the most common ways to transfer a motor's power to a load. From a ventilator to a stone-crushing line, from a machining tool to a conveyor, many sy... More Details

One of the most visible yet most often overlooked parts of an electric motor is the terminal box. This box, where the motor's electrical connection is made, is the critical point w... More Details

A frequency inverter can change the speed of an induction motor, but how it does so depends on the control method you choose. There are two fundamental approaches: scalar V/f contr... More Details

One of the most critical components determining the life and reliability of an electric motor is the bearing system. This element carries the shaft, makes rotation possible and tra... More Details

A soft starter limits the inrush current and mechanical shock of an induction motor by gradually raising the starting voltage instead of connecting the machine directly to the line... More Details

The rotational speed of an electric motor is determined not only by the supply frequency but also by how many magnetic poles are created in the stator. As the pole count increases,... More Details

A frequency inverter provides large energy savings by flexibly adjusting the motor's speed; but this benefit comes with an invisible side effect: electrical noise. The inverter dri... More Details

Choosing the right electric motor is not enough on its own; the cable that feeds that motor must also be chosen correctly. A wrongly chosen supply cable becomes the weak link of th... More Details

There is only one sound way to understand whether switching to an efficient motor makes sense: do the math. The sentence "a high-efficiency motor saves energy" is true but abstract... More Details

One of the most vulnerable points of an electric motor is where the shaft leaves the frame. At this point a small gap must remain between the rotating shaft and the stationary fram... More Details