Pole-Changing DR.. Series AC Motors (2 speeds)

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The simple way of controlling machine and plant speeds economically: 2-speed motors. Sew Eurodrive offers pole-changing DR.. series AC motors with a power combination from 0.15 kW / 0.20 kW to 18 kW / 34 kW. With this large selection, you are sure to find the suitable motor for your application.
We supply pole-changing 2-speed AC motors in sizes and designs DR63 and DRS.. as 4/2 and 8/4-pole motors with speeds in a ratio of 1:2 and as 8/2-pole motors with speeds in a ratio of 1:4 (DRS.. only).
These motors also come from a modular system – take advantage of its benefits: for example, we offer Sew Eurodrive’s pole-changing AC motors for countries with a 50 Hz or 60 Hz line frequency, with the required voltage of course. The pole-changing motors naturally come with all the certifications required by international regulations, so you can use them anywhere in the world, for example in Canada (CAS certification), the USA (UR certification) or in China (CCC certification).
We also offer a wide range of additional features so that you can find the perfect drives to match your applications. For example, with three different brake sizes for each motor frame size, you can size the brake to ensure that braking brings the drive to a halt safely and only as fast as necessary.

Features

  • Simple winding changeover switching gives you two motor speeds
  • Pole-changing motors are a simple and economic option for applications that need “only” 2 speeds
  • Pole-changing motors are not subject to globally applicable efficiency standards, even if only one of the two speeds is continually in use
  • A wide variety of additional features in the SEW‑EURODRIVE modular motor system and various speed ratios (1:2 and 1:4) offer you many potential uses
  • We develop pole-changing motors ourselves according to our own proven modular system and manufacture them according to our own quality standards, even in our series production.

Technical Data

Speed ratios of 1:2

4/2-pole motors

Operating mode S1
Motor type
DR63
PN
kW
MN
Nm
nN
1/min
IN
A
DR63M 4/2 0.15
0.2
1.05
0.71
1 370
2 710
0.55
0.53
DR63L 4/2 0.2
0.28
1.39
0.99
1 370
2 710
0.67
0.67

Operating mode S1

Motor type
DRS..
PN
kW
Mn
Nm
nM
1/min
IN
A
DRS71S 4/2 0.25
0.37
1.71
1.3
1 400
2 720
1.05
1
DRS71M 4/2 0.4
0.63
2.75
2.25
1 380
2 660
1.24
1.66
DRS80M 4/2 0.55
0.88
3.6
2.95
1 455
2 860
1.43
1.91
DRS90S 4/2 0.88
1.3
5.9
4.45
1 430
2 780
2.4
3
DRS90M 4/2 1.2
1.8
8
6.2
1 440
2 780
3.15
4.1
DRS100M 4/2 1.5
2.2
10
7.4
1 430
2 840
3.35
4.3
DRS100L 4/2 2.5
3
17.1
10.1
1 400
2 840
5.5
5.8
DRS132S 4/2 3.3
4
21.5
13.1
1 450
2 915
9
7.5
DRS132M 4/2 4.4
5.5
29
17.9
1 455
2 930
11.3
9.9
DRS160S 4/2 6
7.5
39
24.5
1 470
2 950
12
17
DRS160M 4/2 8.8
11
57
35.5
1 465
2 940
17.5
25
DRS180L 4/2 13
15
84
48.5
1 475
2 960
23.5
31.5
DRS180L 4/2 18.5
20
120
65
1 470
2 960
34.5
45.5

Areas of Application

  • Example 1:
    To limit the mechanical load during startup, the low speed is used and then quickly switched to the high operating speed without stopping. Just before the target, the system initially switches to the lower speed to avoid missing the target position, then the drive is switched off and, in many cases, brought to a complete standstill by a brake (rapid/creep speed positioning). This type of application is used in the horizontal drives and hoists of cranes, for example.
  • Example 2:
    Continually transporting materials in just one direction results in very different load conditions for the drive’s two directions of rotation. To optimise the time the no-load return travel takes, the system switches to the higher speed and returns to the start point. This type of application is used in inclined conveyors for building materials, bulk material, etc., or cable cars and rotary tables.
  • Example 3:
    Stepped speeds are used to handle highly variable amounts of transport goods to reduce the strain on machinery and system components. This type of application is used in conveyor belts for building materials, bulk material, packages, etc.