Gearbox motors

For the mounting of IEC standard motors, the drive shafts were changed such that the shaft journal of the motor can be inserted directly into the bore of the gearbox drive shaft.
As types VLM and SLM, they are part of our product range.

The proven ATEK bevel gearbox and worm gearbox series form the basis for them.
The combination of a large number of motor flanges and the insertable motor shaft journal enables the adaptation to a variety of IEC motors.

Precise three-phase Motors

Gearbox motors are highly precise and powerful three-phase motors. These geared electric motors cope with today’s requirements in every respect. It is not without reason that they are used worldwide, inter alia, in recycling facilities and treatment plants. In everyday language, gearbox motors are also known as electric motors with gearboxes and direct-current Motors.

Product characteristics




Product features

  • Type SLM – Type SL with motor
  • Nominal gear ratios: i = 10:1 up to 83:1
  • Maximum driving torque: 1765 Nm
  • Power outputs of 0.18 up to 35 kW
  • IEC standard motor

Application examples

  • Three-phase motors
  • Worm-gear motors
  • Bevel-gear motors
  • Logistics systems
  • Recycling and treatment plants


ATEK gearbox motors are available for ratings from 0.12 to 30 kW.
The bevel gearbox motors are delivered with output speeds from 3000 to 140 rpm, the worm gearbox motors with output speeds from 590 to 8 rpm.
Pole-changing motors, braking motors, explosion-proof motors and motors with pressure-proof enclosure are also available.
Type DS: three-phase asynchronous motor with cage rotor
Type DP: pole-changing
Type DE: explosion-proof
Type WS: single-phase AC motor
The motors conform to the relevant standards and regulations and the standardisation applied by the EC member states.

All motors come standard with:

Insulation class „F“
Protection rating IP 55
Operating mode S1
Model B5 or B14 DIN 42 950
Normal voltage 230/400 V, 50 Hz, 230/400 V, 60 Hz
In the efficiency class as valid from time to time

Bearing lubrication

The roller bearings of the motors have permanent grease lubrication and are, under normal operating conditions,
maintenance-free for 12,000 to 20,000 service hours.

Voltage and frequency:

Motors wound for 50Hz may also be connected to 60Hz grids.
The resulting changes in speed, output and torque are shown in the Table below.
Conversion factors for the motor output data

Motor winding
for 50 Hz at:
Connection to
60 Hz grid at:
Nominal speed Nominal output Nominal torque Nominal current Starting torque
230 V 230 V 1,20 1,00 0,83 1,00 0,69
400 V 400 V 1,20 1,00 0,83 1,00 0,69
460 V 460 V 1,20 1,00 0,83 1,00 0,69
500 V 500 V 1,20 1,00 0,83 1,00 0,69
230 V 265 V 1,20 1,15 0,96 1,00 0,92
400 V 460 V 1,20 1,15 0,96 1,00 0,92

Motor protection

For the pole-changing motors, it must be ensured that the windings are protected at all speeds.

If appropriate, special switches will be required.

Circuit breakers

In case of current-dependent motor protection, the circuit breaker must be set to the nominal current specified on the rating plate.

In case of higher numbers of switching actuations, cooling temperature variations or speed control with frequency converters, the motor protection is insufficient.

Complete PTC resistor protection

In case of complete PTC resistor protection, 3 temperature probes will be incorporated into the motor winding.
The probes are temperature-dependent resistors that change the resistance almost abruptly at a specific response temperature.
Combined with a triggering device, this effect is utilised to monitor the motor temperature.
The relay installed in the device has a change-over contact. The NO contact thereof is connected for the control.

Switching Operation

Direct-on-line starting

The breakaway starting current and the starting torque are about 1/3 of the values specified for direct-on-line starting.

The motor must have reached approximately the nominal speed prior to the change-over.

Star-delta starting

The breakaway starting current and the starting torque are about 1/3 of the values specified for direct-on-line starting.

The motor must have reached approximately the nominal speed prior to the change-over.

Braking Motors

ATEK gearbox motors up to motor size 160 are also delivered as gear braking motors.
The installed single-disc spring-loaded brake is a safety brake which brakes through spring force when the voltage has been switched off.

The direct-current brake coil is supplied via a rectifier installed in the motor.
After the exciting current has been switched on, the magnetic field builds up, and the brake is released.
In the as-new condition, the air gap between the brake solenoid and brake disc is set to 0.2 mm.
If the maximum air gap of approx. 1.0 mm is exceeded the response time of the brake will increase strongly.
The air gap can be reset to 0.2 mm by adjustment.
Two braking motor types are available.
Type BL = low braking torques,
Type BH = high braking torques.