The main series of engines produced by the domestic industry and their characteristics

Electric motors are produced sequentially, and for mass use — in single series. Single series are characterized by a high level of unification of parts and assemblies, maximum interchangeability. The same stamps are used for this. For example, in order for the rotor and stator plates to be used in machines of different power, the increase in power is achieved by changing the length of the plate packs. Special series are produced — crane, metallurgical, ship, traction, etc.

The separation of type and size is based on the parameter — the height of the axis of rotation h.

h = 50¸355 mm

Each h is available in two types of sizes with different bag lengths S and M, L and M, S and L.

Synchronous rotation speeds n0 = 3000, 1500, 1000, 750, 500 rpm.

Produced in two versions:

1. Closed blown,

2. Protected with internal self-ventilation IP23. h = 50¸132 mm insulation class B,

h = 160¸355 mm insulation class F.

4A series engines.

The 4A series motors are designed for a wide range of applications, in the petroleum industry they are used on pumping units.

Engines of the 4A series have a number of modifications:

1. 4AC — with increased slip.

2. 4AP — with increased starting torque, double squirrel cage. They are used to drive belt conveyors.

3.4AK — with a phase rotor.

4. 4AB — built-in.

5. Multi-speed for 2,3 and 4 speeds.

6. At a frequency of 60 Hz (export).

7. Low noise (they have a large bevel of the channels).

8. With built-in temperature protection (thermistor in the front).

9. With built-in EMT.

The terms of use of the series are as follows:

1. The environment is not explosive.

2. Free of conductive dust, corrosive gases and vapors.

AIR series engines

The AIR series engines were developed within the Interelectro program.

The motors of the AIR series are manufactured with a height of the rotating axis h = 45 — 355 mm, Pn = 0.025 — 315 kW, Un = 220/380 V or 380/660 V.

Version: Closed ventilated for all h or protected with internal ventilation at h = 160¸355 mm (IP23).

Differences between AIR series and 4A series engines:

1. High strength aluminum alloys, plastics and more advanced ventilation system are used.

2. Bearings with improved vibration resistance are used.

3. Compared to the motors of the 4A series, the temperature is reduced by 10 — 12 ° C, which provides an increase in the power of the electric motor in the same dimensions.

Asynchronous electric motors AIR series
Technical characteristics of asynchronous electric motors of the AIR series

High voltage induction motors, squirrel rotor

AH2 series motors are used to drive pumps and fans.

They are manufactured with power Рn from 500 to 2000 kW, n0 = 1000, 750, 600, 500, 375 rpm, Un = 6000 V. They are manufactured only with the horizontal position of the shaft on two shield rolling bearings. Protected design (IP23).

The stator housing and end shields are welded from sheet steel. Insulation class C. They have a double squirrel cage: starting and working. Starting (top) — from brass, Working (bottom) — from copper rods.

AD: series 4АН32.

It is a 6000 V motor. It has a closed design with forced ventilation by an external fan. Рn = 500 — 2000 kW. AD: 4ATD series. Рn = 1000 — 5000 kW. Un = 6000 V / 10000 V. The thermal state of these motors is controlled by thermal resistors installed in the front parts. When the motor overheats, a shutdown signal is given.

2P series DC machines

These are machines for general industrial use. The typification is based on the height of the axis of rotation h = 90 — 315 mm, нн = 750 — 4000 rpm. 11 sizes available. Each dimension can have two lengths: medium (M) and long (L).

There are four versions according to the method of protection and cooling:

1. Protected version with self-ventilation: 2PI.

2. Protected construction with independent ventilation by external fan: 2PF.

3. Closed version with natural cooling: 2PB.

4. Closed version with external fan blowing: 2PO.

Motors have independent excitation: 110 or 220 V. Armature voltage: Uya = 110, 220, 340, 440 V.

Generators are manufactured only with a protective design. They can be independent, parallel or mixed excitation. Independent excitation can be 110 or 220 V. Generator U = 115, 230, 460 V.

The generator provides armature voltage regulation:

1.from 0 to Un — with independent excitation.

2. from 0.5 Un to Un — with parallel excitation.

3. from 0.8 Un to Un — with mixed excitation.

For h = 90 — 200 mm, insulation class B and higher insulation class F.

Crane and metallurgical series of asynchronous motors

Grades: 4MTF (wound rotor), 4 MTKF (squirrel rotor).

These are intermittent duty engines. They are used on cranes with severe working conditions. The main operating mode of PV is 40%.

Differences from the 4A series:

1. The squirrel rotor is made of material with increased active resistance (AMG-alloy).

2. There is an increased starting torque Mn / Mn = 3¸3.5.

3. It has an increased overload capacity Mcr / Mn = 3.3¸3.5

4. It has increased mechanical strength.

5. Engines are designed for frequent starts and turns, including braking with links.

6. Large air gap compared to other series engines.

7. The motors have the worst cos j and h energy performance compared to the general industrial series motors.

8. Engines are longer than other engines.

Engines are usually of closed blown design. Beds and end shields are cast iron. For cranes of metallurgical production, a modification of these engines MTN, MTKN is used. Their feature lies in the fact that they can be made for a non-standard voltage of 500 V. For cranes with an adjustable electric drive from a frequency converter, motors of the series: MAP 521 — 50 kW, MAP 422 — 10 kW are produced.

Crane series DC motors, D.

D series motors can have series, mixed, parallel excitation.

Features of these engines:

1.Regulation from static transformer substations is permitted without the use of smoothing reactors.

2. Motors have laminated cores. This is done to improve commutation.

3. Motors are designed to operate at high switching frequencies (up to 1000 per hour).

4. Engines are produced in two versions: — low-speed version, with starting frequency up to 1000 per hour. — high-speed version up to 150 starts per hour.

5. Class H insulation is used for all windings.

6. The main nominal mode is short-term (60 min.). The duty cycle is equal to 40%.

7. The parallel coil is designed for 100% duty cycle and consists of two groups that can be connected to 140 V (parallel) and 220 V (series).

8. At Uya = 440V, a resistor is connected to the field winding circuit.

9. Engines allow increasing speed by increasing Uya.

10. It is allowed to control the speed by weakening the magnetic flux, but the maximum value of n is limited.

11. All motors have four primary and four auxiliary poles.