
Common Induction Motor Faults and Their Symptoms
An induction motor stopping suddenly or failing unexpectedly rarely comes without warning. Before they break down, motors usually give signs: the temperature rises, the noise chang... More Details
Knowing the basics is essential to choosing the right motor. In this category you will find guide content on the electric motor working principle, motor types, efficiency classes and selection criteria. Get to know the world of motors with the technical knowledge of the DRG Motor expert team.
For the right motor, power (kW), speed (rpm), efficiency class, body material and mounting type should be considered together. Our high efficiency motors page guides you on efficiency and the power and speed options page on power/speed.
What is the difference between asynchronous and synchronous motors? In an asynchronous motor the rotor turns slightly slower than the magnetic field; in a synchronous motor it turns at the same speed.
Why is motor efficiency important? High efficiency does the same work with less electricity, lowering operating costs.
DRG Motor supports businesses on both the product and knowledge side. By reviewing this guide content you can choose the right motor more consciously, and contact us via drgmotor.com for technical questions.
Motor efficiency is classified as IE1 (Standard), IE2 (High), IE3 (Premium), IE4 (Super Premium) and IE5 (Ultra Premium). The higher the class, the lower the energy loss and the greater the savings. Which class suits you is determined by your running hours and power needs; review our guide content for details.
Which mounting type is needed? Foot (B3) mounting is used in most applications, while flange (B5) or combined (B35) mounting is preferred where direct coupling is required.

An induction motor stopping suddenly or failing unexpectedly rarely comes without warning. Before they break down, motors usually give signs: the temperature rises, the noise chang... More Details

One of the most confusing topics you encounter when buying an electric motor is the two different standards that define the motor's frame size: IEC and NEMA. IEC is widespread in E... More Details

Flange-mounted electric motors bolt directly to machines such as pumps, gearboxes and fans, offering a far more compact mounting solution than foot-mounted bodies. The flange face ... More Details

One of the most fundamental questions when designing a drive system is this: AC motor or DC motor? This choice is not merely a technical preference; it shapes the entire life cycle... More Details

When you connect a motor directly to the grid, the windings meet a smooth, gentle sinusoidal voltage. But when you connect the motor behind a frequency inverter, the situation chan... More Details

The most honest information about an electric motor's health usually comes from its vibration. When bearings begin to wear, when rotor imbalance develops, or when fasteners loosen,... More Details

The correct operation of an electric motor depends on its power, speed and efficiency, and on how it is mounted. The way the motor connects to the machine, that is the mounting typ... More Details

One of the most frequent threats an electric motor faces is overload. When a motor runs above its capacity, it draws excessive current, heats up and over time can burn out. Overloa... More Details

There is more than one way to connect an electric motor to the equipment it drives, and this is called the mounting type. Foot, flange or combined mounting options determine how th... More Details

Electric motors cannot convert all of the energy they draw from the network into useful work; a portion is used to create the magnetic field and never turns into work. The concept ... More Details

When replacing an electric motor or connecting one to a piece of equipment, one of the most frequently encountered concepts is the frame size. Defined according to the IEC standard... More Details

The most heavily worn and most frequently failing component of an electric motor is its bearings. A significant share of motor faults stems directly from bearing problems. Well-mai... More Details

Wherever an electric motor is going to operate, it must be protected against the dust, moisture and water of that environment. The level of this protection is defined by the IP pro... More Details

The most widely used motor in industry is the induction motor. However, in places that demand precise positioning, step and servo motors are preferred. These three motor types are ... More Details

How high a temperature an electric motor can withstand depends on the insulation of the windings inside it. The insulation class, shown on the motor nameplate with a letter such as... More Details

Three-phase electric motors run on the balanced energy of three phases, and that balance is the foundation of healthy operation. But if one of the phases is cut off or lost for any... More Details

In the traditional approach to maintenance, repairs are either carried out after a breakdown occurs or planned maintenance is applied at fixed intervals. Both methods have their sh... More Details

Not every electric motor runs continuously; some are used seasonally, some are kept on standby as spares, and others are stored in a warehouse. Yet leaving a motor idle for a long ... More Details

With the right care, an electric motor can run trouble-free for decades; when neglected, it can fail at an unexpected moment and bring production to a halt. The most important fact... More Details

An electric motor is usually connected to the equipment it drives through a coupling (a shaft connection element). The quality of this connection, namely the alignment of the motor... More Details