Geared Motors –  Technical Information

Contents
• Motors
• Bearing Lubrication
• Voltage and Frequency
• Conversion Factors for Motor Performance Data
• Pole-Reversing Motors
• Motor Protection
• Circuit Breaker
• Full PTC Resistor Protection
• Wiring
• Braking Motors
• Braking Torques
• Special Versions

Motors
ATEK geared motors are available for outputs from 0.12 to 30 kW. Bevel-geared motors are available in output speeds of 3000 to 140 rpm.

Pole-reversing motors, braking motors and motors in explosion-proof and pressure-proof designs are also available.

Type DS: three-phase asynchronous squirrel-cage motor
Type DP: - pole-reversing motor
Type DE: - explosion-proof motor
Type WS: - single-phase AC motor

All motors comply with the relevant standards and regulations and with the standards in force in the EU member states.

All motors are supplied with the following standard equipment:
• Insulation class "F"
• Protective system IP 54
• Operational mode S1
• Design B5 or B14 DIN 42 950
• Standard voltage 220/380 V, 50 Hz to 1.1 kW
• Standard voltage 380/660 V, 50 Hz above 1.5 kW

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

Voltage and Frequency
Motors wound for 50 Hz can also be connected to 60 Hz mains. The resultant changes in speed, output and torque are shown in the table below.


Conversion Factors for Motor Performance Data



Permissible voltage deviations +/- 5% at nominal output and
nominal frequency in accordance with VDE 0530.

Pole-Reversing Motors
Motors with a speed ratio of 2:1 are constructed with a winding using a Dahlander pole-changing circuit.
Separate windings must be used for other speed ratios.
The following speed combinations are available from series production:



Please enquire about speed combinations not listed in the table.

Motor Protection
Ensure that the windings of pole-reversing motors are protected at all speeds. Special switches must be installed if necessary.

Circuit Breaker
Where current-dependent motor protection is used, the circuit breaker must be set to the nominal current given on the rating plate. Motor protection is inadequate where switching frequency is higher, where there are variations in the cooling temperature or where speed regulation uses frequency converters.


Full PTC Resistor Protection
Where full PTC resistor protection is provided, three temperature sensors are wound into the motor winding. The sensors are temperature-dependent resistors that almost immediately change the resistance at a specified response temperature. This effect is used to monitor the motor temperature in conjunction with a trigger device. The relay integrated into the device has a change-over contact of which the N/O contacts are connected to control the motor.

Wiring
Direct Switch-on
The starting torque in direct switch-on is 150-300% of the nominal torque, depending on output and number of poles. The switch-on currents are approximately 4 to 6 times the nominal current. The requirements of the responsible electricity supply utility must be observed in view of this high starting current.

Star-Delta Switch-on
Both pick-up current and starting torque are about 1/3 of the values given for direct switch-on. The motor must have approximately reached its nominal speed before reversing.

Braking Motors
ATEK geared motors up to size 160 are also available as geared braking motors. The integrated spring-actuated single-disc brake is a safety brake operating by spring tension when the voltage is disconnected. The DC braking coil is fed via a rectifier built into the motor. Once the exciter current has been switched on, the magnetic field is built up and the brake is released.

When new, the air gap between the brake magnet and the brake disc is set to 0.2 mm. The response time of the brake increases considerably if the maximum air gap of approximately 1.0 mm is exceeded.

The air gap can then be readjusted back to 0.2 mm.

Braking Torques
Two braking motor versions are available:

Version BL = low braking torques
Version BH = high braking torques



Unless otherwise specified, the BH motors are set to the maximum braking torque.

For extreme requirements such as deceleration of large balance weights, exact stopping accuracy or high switching frequency, a series of three-phase motors with attached three-phase brake is available. Please enquire for further information.

Special Versions
The following special versions are available at extra cost:
- Protective system IP 55, IP 56, IP 65
- Protective roof for model V1
- Second standard shaft end or special shaft end
- Special voltages
- Multiple-range voltage
- Insulation class H
- 3 integrated PTC thermistor temperature sensors
- 3 integrated bimetallic thermal sensors
- Tropical insulation
- Terminal box for pole-reversing motors with 9 terminals, with 12 terminals
- Manual release for braking motors