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Blog — useful articles about electric motors

Expert blog

Useful articles about electric motors

Tips on operation, diagnostics, repair and rewinding of electric motors from Elektromotors engineers.

Comparison

Rolling or plain bearings

What is the difference between rolling and sliding bearings in electric motors, their pros, cons and where they are used. Which...

2026-07-13 6 min
Comparison

Copper or aluminum motor winding

What is the difference between copper and aluminum electric motor windings, what is more reliable, and what to choose when rewi...

2026-07-12 6 min
Comparison

ABB, Siemens, WEG: comparison of brands

Comparison of popular brands of industrial motors ABB, Siemens and WEG: quality, price, availability and maintainability. Tashk...

2026-07-11 7 min
Comparison

Domestic or imported engines

Comparison of domestic (AIR, 4A) and imported (ABB, Siemens, WEG) electric motors: price, reliability, maintainability, spare p...

2026-07-10 7 min
Comparison

Insulation classes F, H, B - what to choose

What do insulation heat resistance classes B, F, H mean, what temperature can they withstand and how do they affect the service...

2026-07-09 6 min
Comparison

DC or AC motor

What is the difference between DC and AC motors, their pros, cons and applications. What to choose for the task. Tashkent.

2026-07-08 8 min
Diagnostics

Interturn closure: how to determine

What is an interturn winding short circuit, what are the signs to recognize it and how to check it. Diagnostic methods. Tashkent.

2026-07-07 7 min
Diagnostics

Phase loss: signs and consequences

How to recognize a phase loss in a three-phase motor, why it is dangerous and how to protect yourself. Signs, consequences, pro...

2026-07-06 7 min
Diagnostics

The engine does not gain momentum: reasons

Why does the electric motor not reach rated speed: overload, phase loss, rotor problems, low voltage. Checklist. Tashkent.

2026-07-05 6 min
Diagnostics

The engine runs jerkily: reasons

Why does the electric motor run jerkily and unevenly: broken rotor rods, power problems, mechanical reasons. Diagnostics. Tashk...

2026-07-04 6 min
Diagnostics

Noise and hum of engine bearings

How to determine the wear of electric motor bearings by sound, what kind of noise there is and when urgent replacement is neede...

2026-07-03 6 min
Diagnostics

Electric motor commutator sparks: reasons

Why does a DC motor commutator spark: brush wear, contamination, inter-lamella short circuit. How to eliminate sparking. Tashkent.

2026-07-02 7 min
Diagnostics

The engine loses power: reasons

Why does an electric motor lose power and not pull the load: voltage drop, wear, interturn short circuit, mechanical losses. Ta...

2026-07-01 7 min
Diagnostics

Burning smell from an electric motor: what to do

Why does an electric motor smell like burning: overheating of insulation, interturn short circuit, overload. How dangerous is i...

2026-06-30 6 min
Diagnostics

The engine knocks out the machine: reasons

Why does the electric motor knock out the machine when starting up or during operation: short circuit, overload, breakdown to t...

2026-06-29 7 min
Diagnostics

The engine vibrates: causes and solutions

Why does the electric motor vibrate: rotor imbalance, bearing wear, misalignment, loose mounting. How to find and eliminate. Ta...

2026-06-28 8 min
Diagnostics

The engine is electrocuted: reasons and what to do

Why does the electric motor generate current on the housing: insulation breakdown, lack of grounding, moisture. How to check an...

2026-06-27 7 min
Diagnostics

The engine hums but does not turn over: reasons

Why does the electric motor hum but does not start: phase loss, jamming, faulty capacitor. Diagnostic checklist. Tashkent.

2026-06-26 7 min
Industries

Repair of electric motors of textile enterprises

Specifics of engines in textile and clothing production, the influence of dust and load, organization of repairs without stoppi...

2026-06-25 8 min
Industries

Electric motors for pumping stations and water utilities

Features of the operation and repair of pumping station engines, typical faults and why quick repairs are important. Tashkent a...

2026-06-24 8 min
Prices

Electric motor diagnostic price: what is included

How much does it cost to diagnose an electric motor, what methods are used and why it saves money on repairs. Let's understand ...

2026-06-23 7 min
Prices

How much does it cost to replace bearings in an electric motor?

What affects the price of replacing engine bearings, why you can’t delay repairs, and what is included in the work. Practical g...

2026-06-22 7 min
Prices

Electric motor overhaul price

What does the cost of an engine overhaul consist of, what is included in the work, and when is an overhaul more profitable than...

2026-06-21 8 min
Tips

How to read an electric motor nameplate

Explanation of the electric motor plate: power, speed, current, voltage, efficiency, IP and insulation class. What does each pa...

2026-06-21 7 min
Prices

Cost of stator rewinding based on engine power

What determines the price of stator rewinding and how engine power affects the cost of work in Tashkent. Let's look at pricing ...

2026-06-20 8 min
Tips

Setting up motor thermal protection

How to correctly select and configure a thermal relay to protect an electric motor from overload. Setpoint calculation and typi...

2026-06-20 6 min
Tips

Star and delta connection

What is the difference between star and delta connection schemes, when to use which one and how switching affects the engine. C...

2026-06-19 7 min
Tips

Aligning the engine with the mechanism

Why is it necessary to align an electric motor with a pump or gearbox, what are the dangers of misalignment and how to do it. P...

2026-06-18 6 min
Tips

Drying motor windings

When and how to dry motor windings, drying methods and how to measure the result. Saving the engine after humidification. Tashk...

2026-06-17 6 min
Tips

How to start the engine after repair

Correct first start of an electric motor after repair: pre-start checks, running-in and parameter control. Step by step. Tashkent.

2026-06-16 6 min
Cases

Case: crane engine repair at a construction site

How they restored an MTF crane engine at a construction site in Tashkent in one day and returned the tower crane to work. Real ...

2026-06-14 6 min
Cases

Case: urgent repair of a pump at a water utility

How they restored a burnt-out pump motor at the Tashkent waterworks and restored water supply in the shortest possible time. Re...

2026-06-13 6 min
Prices

Rewind or new engine: which is more profitable in 2026

We compare rewinding and buying a new engine in 2026: cost, resource, timing and scenarios when each option is justified. Solut...

2026-06-12 9 min
Cases

Case: engine restoration after flooding

How a flooded electric motor was saved without a complete rewind using professional drying and impregnation. Real case from Tas...

2026-06-12 6 min
Cases

Case: compressor motor repair

How to restore an industrial compressor engine after overheating and return the equipment to operation. Real case from Tashkent.

2026-06-11 6 min
Cases

Case: textile factory engine repair

How they restored the engine of a weaving loom, which had failed due to textile dust, and established preventative measures at ...

2026-06-10 6 min
Cases

Case: engine restoration after overheating

How we restored an engine that burned out due to clogged ventilation and eliminated the cause of overheating. Real case from Ta...

2026-06-09 5 min
Guides

Marking of electric motors: complete analysis

How to decipher the markings of electric motors AIR, 4A, DAZO: what the letters and numbers in the designation mean. Full analy...

2026-05-26 7 min
Guides

What is the efficiency and cos φ of the engine

What do the efficiency and power factor (cos φ) of an electric motor mean, how do they affect energy consumption and why are th...

2026-05-25 6 min
Guides

Impregnation of windings: why and how

Why is impregnation of electric motor windings with varnish necessary, what methods are available and how it affects the servic...

2026-05-24 6 min
Guides

Stator rewinding technology: stages

Step-by-step technology for rewinding an electric motor stator: from removing the old winding to impregnation and testing. How ...

2026-05-23 7 min
Guides

What is motor winding rewinding

What is winding rewinding, when is it needed and how does this process work? Explanation in simple words for equipment owners. ...

2026-05-22 6 min
Guides

How an electric motor works: in simple words

A clear explanation of the operating principle of an electric motor: magnetic field, rotor rotation, energy conversion. No comp...

2026-05-21 6 min
Guides

Asynchronous motor device

What does an asynchronous electric motor consist of: stator, rotor, bearings, housing. A simple explanation of the design and p...

2026-05-20 7 min
Guides

Glossary of terms: electric motors

A brief dictionary of basic terms for electric motors: stator, rotor, slip, rewinding, IP, insulation class and other concepts....

2026-05-19 6 min
Guides

How to calculate engine torque

What is electric motor torque, how is it related to power and speed, and how to calculate it. Formula and practical meaning. Ta...

2026-05-18 5 min
Guides

Motor winding connection diagrams

How are the terminals of the windings designated and what are the connection diagrams for a three-phase motor. Designations U1-...

2026-05-17 6 min
Guides

How to calculate engine power

How to determine and calculate the required electric motor power for a pump, fan or mechanism. Formulas and practical guideline...

2026-05-16 6 min
Guides

Engine starting characteristics

What is the starting current and starting torque of an electric motor, why the starting current is large and how to take it int...

2026-05-15 6 min
Guides

Slip of induction motor

What is slipping of an asynchronous motor, why is it needed and how does it affect the operation of the machine. Simple explana...

2026-05-14 5 min
Guides

Reactive power and compensation

What is reactive power of electric motors, why do they pay for it and how to compensate for it. Saving on electricity bills. Ta...

2026-05-13 6 min
Guides

What is the heat resistance class of insulation

What does the heat resistance class of winding insulation mean, how temperature affects the service life of the motor and why i...

2026-05-12 5 min
Guides

Engine operating modes S1–S8

What do the operating modes of the electric motor S1, S2, S3 and others mean, what is the difference between long-term and inte...

2026-05-11 6 min
Guides

Operating principle of frequency converter

How does a frequency converter work and why is it needed to control an electric motor? Smooth start, speed control, saving. Tas...

2026-05-10 6 min
Guides

How does a commutator motor work?

Commutator motor structure: armature, commutator, brushes, field winding. How it works and why it requires care. Simple explana...

2026-05-09 6 min
Prices

Electric motor repair time: from 1 day to 2 weeks

How long does it take to repair an electric motor in Tashkent: real time frames by type of work, influencing factors and the op...

2026-05-08 8 min
Guides

Overall and connecting dimensions of the motor

What are the overall and connecting dimensions of an electric motor, the mounting design IM and how to choose a motor by size. ...

2026-05-08 6 min
Industries

Electric motors for HVAC systems

Motors of ventilation, heating and air conditioning systems: fans, pumps, requirements for silence and balancing. Repair. Tashk...

2026-05-07 6 min
Industries

Electric motors in the chemical industry

Chemical production engines operate in aggressive environments. Explosion protection, corrosion resistance, repair while mainta...

2026-05-06 6 min
Industries

Electric motors in metallurgy

Engines in metallurgical production operate at high temperatures and loads. Rolling mills, cranes, ventilation. Repair. Tashkent.

2026-05-05 6 min
Industries

Electric motors for agriculture

Engines in agriculture: irrigation pumps, grain processing, ventilation. Features of field operation and repair. Tashkent and r...

2026-05-04 6 min
Industries

Electric motors in the mining industry

Mining engines operate in extreme conditions: dust, moisture, vibration, explosion hazard. Features of repair and protection. T...

2026-05-03 7 min
Industries

Electric motors in the cement industry

Cement plant engines operate in dust and under high loads. Features of operation and repair of mills, crushers and fans. Tashkent.

2026-05-02 7 min
Industries

Electric motors in the food industry

Features of engines in food production: hygiene, humidity, washing, protection requirements. Repair and maintenance. Tashkent.

2026-05-01 7 min
Diagnostics

How to check engine bearings

How to check the condition of electric motor bearings: play, noise, heating, rotation. Diagnostic methods and when to change. T...

2026-04-29 6 min
Diagnostics

Measuring insulation resistance with a megohmmeter

How to measure the insulation resistance of an electric motor with a megger, what are the standards and what does the result in...

2026-04-28 7 min
Diagnostics

Single-phase motor hums and does not start

Why does a single-phase electric motor hum but does not start: faulty capacitor, starting winding, centrifugal switch. Tashkent.

2026-04-27 6 min
Diagnostics

Engine stops under load

Why does an electric motor stall under load: overload, phase loss, weak torque, rotor problems. How to find the reason. Tashkent.

2026-04-26 6 min
Diagnostics

The rotor touches the stator: reasons

Why does the rotor touch the stator of an electric motor, what the danger is and how to eliminate it. Bearing wear, shaft defle...

2026-04-25 6 min
Diagnostics

The engine smokes when starting: reasons

Why does an electric motor smoke when turned on: winding combustion, interturn short circuit, overload. What to do immediately....

2026-04-24 6 min
Prices

How to save money on engine repairs

Practical ways to reduce electric motor repair costs without losing quality. Prevention, timeliness, choice of service. Tashkent.

2026-04-21 6 min
Prices

Engine repair or replacement: calculation

When is it more profitable to repair an electric motor, and when to buy a new one? Economic calculation and the 70% rule. Pract...

2026-04-20 7 min
Prices

What determines the price of engine repair?

The main factors influencing the cost of repairing an electric motor: power, type, nature of the breakdown, urgency. How the es...

2026-04-19 7 min
Prices

Urgent engine repair price

How much does urgent electric motor repair cost, what does the extra charge for urgency consist of and when is it justified? An...

2026-04-18 6 min
Prices

Elevator motor repair cost

What makes up the cost of repairing an elevator motor, features and why speed is important. Analysis for service organizations....

2026-04-17 6 min
Prices

Crane motor repair cost

What is the cost of repairing a crane electric motor, why is it more expensive than a regular one, and how to save money. Analy...

2026-04-16 7 min
Tips

Engine ventilation and cooling

How does electric motor cooling work, why clean ventilation is important and how to avoid overheating. Practical advice. Tashkent.

2026-04-13 6 min
Tips

Single-phase protection

How to protect a three-phase motor from phase loss and single-phase mode, what devices are used and why this is important. Tash...

2026-04-12 6 min
Tips

How to extend bearing life

Practical ways to extend the life of electric motor bearings: lubrication, alignment, protection from contamination. Advice fro...

2026-04-11 6 min
Tips

Running in the engine after repair

Why is it necessary to run-in an electric motor after repair, how to carry it out and what to control. Practical guide. Tashkent.

2026-04-10 5 min
Tips

Cleaning the electric motor: how and why

Why is it important to regularly clean the electric motor, how to do it correctly and the dangers of contamination. Practical a...

2026-04-09 5 min
Tips

Reactivation of the engine after storage

How to properly put an electric motor into operation after long-term storage: checking, drying, measuring insulation. Step by s...

2026-04-08 6 min
Comparison

Explosion-proof motors: types

What types of explosion-proof electric motors are there, how the types of explosion protection differ and where they are used. ...

2026-04-06 6 min
Comparison

Motor with or without brake

What is the difference between an electric motor with a built-in brake and a conventional one, where is a brake motor needed an...

2026-04-05 6 min
Comparison

How to choose a motor for a fan

How to choose an electric motor for a fan: power, speed, balancing, quiet operation. Practical guide for ventilation systems. T...

2026-04-04 6 min
Comparison

How to choose a motor for a pump

How to choose an electric motor for a pump: power, speed, degree of protection, features. Practical guide for water supply. Tas...

2026-04-03 6 min
Comparison

How to choose an engine by power

How to choose the right electric motor power for the task, what are the dangers of under and over power. Practical guide. Tashk...

2026-04-02 6 min
Comparison

Frequency generator or soft starter

What is the difference between a frequency converter and a soft starter, what to choose for the task and when an overpayment is...

2026-04-01 6 min
Prices

Electric motor repair warranty: what is included in 2026

What kind of guarantee is given for electric motor repairs in 2026: terms, what is covered, what is not included, how to file a...

2026-03-20 8 min
Prices

How much does it cost to repair an electric motor in Tashkent - prices 2026

Let's look at what the cost of repairing an electric motor in Tashkent in 2026 consists of: power, type, degree of damage and r...

2026-01-15 8 min
Diagnostics

Engine does not start: diagnostic checklist

Electric motor won't start? Step-by-step checklist of 10 points: power supply, fuses, contactor, capacitor, windings, bearings.

2024-09-17 9 min
Diagnostics

Why the electric motor hums - 5 main reasons

Is the electric motor humming but not starting or is it whining? We look at the 5 main causes of hum and explain how to diagnos...

2023-06-05 7 min
Diagnostics

7 signs that it’s time to repair the electric motor

Vibration, hum, overheating, sparking - we look at 7 obvious signs of an electric motor malfunction and explain when to urgentl...

2022-11-28 8 min
Comparison

Frequency converter for an electric motor: when needed

Frequency converter for electric motor: soft start, savings 20–40%, models Danfoss, ABB, Siemens, Hyundai. When is an emergency...

2021-09-25 9 min
Diagnostics

Signs of wear on motor bearings

Rumble, vibration, heating and lubricant leaks are 7 clear signs of wear on the electric motor bearings. How to recognize a bre...

2021-03-16 8 min
Tips

Storing electric motors: rules and terms

How to properly store electric motors: humidity, temperature, bearing protection, anti-corrosion, periodic inspections, commiss...

2020-07-09 9 min
Diagnostics

Thermal imaging diagnostics of electrical equipment

Thermal imaging diagnostics of electric motors and switchboards: operating principle, typical overheating points, temperature s...

2020-02-14 8 min
Diagnostics

Vibration diagnostics of electric motors: equipment and methods

How to conduct vibration diagnostics of an electric motor: types of vibrations, SD-12, IRD, SKF devices, ISO 10816 standards, s...

2019-11-20 9 min
Tips

Lubrication of electric motor bearings - what and how often

Which lubricant to choose for electric motor bearings, replacement frequency based on speed and size, errors and signs of excess.

2019-04-22 9 min
Comparison

Degrees of protection IP54, IP55, IP66 - decoding for electric motors

What do IP54, IP55, IP66 and IP69K mean? A complete breakdown of the degree of protection of the electric motor IP, a table of ...

2018-10-14 9 min
Comparison

Energy efficiency classes IE1, IE2, IE3, IE4 - what to choose

Let's look at classes IE1–IE4: efficiency, payback, price. Which electric motor energy efficiency class to choose in 2026 - exp...

2018-01-08 9 min
Tips

Repair of DC motor with brush assembly

DC motor repair: armature and commutator installation, replacement of EG-74 and EG-841 brushes, commutator grooving, balancing....

2017-12-03 10 min
Cases

Case: restoration of the Soviet AIR-100 after 30 years of work

How we returned to service the Soviet AIR-100L4 produced in 1990 on the assembly line of a machine-building plant in Tashkent. ...

2017-08-04 10 min
Diagnostics

Electric motor overheating: causes and what to do

Electric motor overheating: 6 main reasons, temperature standards by insulation class, diagnostics, urgent measures and prevent...

2017-05-25 8 min
Diagnostics

How to check the winding of an electric motor with a multimeter

Step-by-step instructions: how to check the winding of an electric motor with a multimeter, resistance standards, safety and in...

2016-09-30 8 min
Comparison

Electric motors in the oil and gas industry

Explosion-proof electric motors for the oil industry: Ex d and Ex e versions, PUE requirements, repair of pumps and compressors...

2016-04-08 10 min
Comparison

Single-phase or three-phase motor - differences and application

We analyze the technical differences between single-phase and three-phase motors: power, start-up, application and cost of repa...

2016-02-12 8 min
Tips

10 tips to extend the life of your electric motor

10 practical tips on how to extend the service life of an electric motor by 30-50%: proper installation, ventilation, maintenan...

2015-06-18 8 min
Cases

Case: Mitsubishi elevator motor repair in 36 hours

A real case of urgent repair of a Mitsubishi YPM-15K elevator motor in a Tashkent shopping center: diagnostics, rewinding, comm...

2015-03-12 9 min
Comparison

Asynchronous or synchronous motor - what to choose

We compare asynchronous and synchronous electric motors: efficiency, cost, control, repair and scope of application in Tashkent...

2014-11-05 8 min
Comparison

Electric motors for the cotton industry of Uzbekistan

What electric motors do cotton factories in Uzbekistan need: types, power, dust protection, repair of AIR-160 and DAZO. Experie...

2014-07-18 9 min
Tips

Maintenance of electric motors - schedule and regulations

Full maintenance schedule for electric motors: daily, weekly, monthly and annual maintenance. What to check, who to trust, how ...

2014-03-10 9 min
Cases

Case: urgent stator rewinding for a cotton factory

How Elektromotors rewinded a DAZO-450 110 kW stator for a cotton factory in the Bukhara region in 36 hours and saved the client...

2013-08-22 8 min
Tips

Protection of electric motors from overload and short circuit

RTL/RTT thermal relays, VA-88 circuit breakers, RCDs and PTC temperature sensors - how to choose electric motor protection agai...

2013-05-14 9 min
Tips

How to choose the right replacement electric motor

Selection of electric motor for replacement: power, speed, dimensions IM, mount B3/B5, IP. Conformity table AIR, AIRS, ADA. Adv...

2012-09-08 9 min
Cases

Case: restoration of a 75 kW engine in 4 days

A real case of overhaul of an AIR-280M4 electric motor with a power of 75 kW for a cement plant in Akhangaran - diagnostics, st...

2012-04-15 8 min

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