FAQ & Knowledge about Motor Spindles: Motor Spindle Features

SPINOGY motor spindles offer a wide range on individual configuration options to ensure they are optimally suited to each specific application:

  • Cooling type: Air- or liquid-cooled
  • Tool interface: MTC, QTC, ATC, DTC
  • Motor: Power, voltage, and number of poles
  • Maximum speed
  • Bearings: Steel or hybrid bearings
  • Temperature sensors: e.g., on the motor winding head and on the bearings (front and rear)
  • Speed sensors: inductive sensor or encoder.
  • IP protection class
  • Connections: straight or angled
  • Customization / Branding: e.g., with your own logo
  • Extended warranty

This allows the motor spindles to be precisely tailored to a wide range of applications and requirements—from standard solutions to custom designs.

Depending on the selected power rating, SPINOGY HF spindles use either asynchronous or synchronous motors.

SPINOGY X22:

  • 1.5 kW – 3.0 kW: Asynchronous motor
  • 4.0 kW: Synchronous motor

SPINOGY X30:

  • 3.0 kW – 5.0 kW: Asynchronous motor
  • 6.0 kW: Synchronous motor

The choice of motor type depends on the desired power and torque characteristics of the motor spindle.

Depending on the power rating, the SPINOGY high-frequency spindles are available in 230 V or 400 V.

  • 1.5 kW – 3.0 kW: 230 V and 400 V
  • 4.0 kW – 6.0 kW: 400 V

This allows the spindles to be flexibly integrated into various machine and system designs.

For the motor options of SPINOGY spindles, you can choose between a 2-pole and a 4-pole motor in every power class.

The main difference lies in the rated speed:

At the same frequency, a 2-pole motor achieves approximately twice the speed of a 4-pole motor.

This shifts the performance range:

  • 2-pole motors are optimised for high speeds
  • 4-pole motors deliver their torque and rated power in a lower speed range, but can reach the same speeds as 2-pole motors

Therefore, 4-pole motors are particularly suitable for applications requiring higher torque at low speeds, such as drilling and threading operations or when using larger tools. In other words, wherever torque is more important than speed.

Potting the stator offers the following benefits:

  • Improved thermal conductivity: Heat is dissipated more efficiently, enabling higher continuous power and reduced thermal stress.
  • Increased mechanical stability: Protection against mechanical stress.
  • Longer service life: Improved cooling significantly reduces insulation aging.
  • Noise reduction: Encapsulation reduces vibrations in the windings and thus the noise generated by the spindle.

The difference between steel and hybrid bearings lies in the material of the rolling elements:

In steel bearings, both the bearing rings and the balls are made of steel.

In hybrid bearings, the bearing rings are made of steel, while the balls are made of ceramic (e.g., silicon nitride).

Advantages of hybrid bearings:

  • Higher speeds due to lower centrifugal forces
  • Lower friction and thus reduced heat generation.
  • Improved smoothness and higher rigidity
  • Electrical insulation within the bearing

Steel bearings represent a robust and cost-effective solution for applications with moderate speeds and are therefore used as standard in all our milling spindles.

Yes – air -cooled SPINOGY motor spindles can be optionally equipped with a filter. Retrofitting is also easily possible for existing spindles.

The use of a filter is particularly recommended in applications where fine particles or dust are generated that could be drawn into the spindle by the fan.

Alternatively, a liquid-cooled SPINOGY milling spindle can be used to fully encapsulate the spindle.

In SPINOGY ATC spindles, tool clamping is monitored via integrated sensors:

Sensors (standard):

  • Two sensors for monitoring the clamping position (tool clamped / released)
  • One sensor for monitoring the piston position.

Functionality:

  • Use of inductive sensors
  • Output as a digital signal:
  • 24 V (High) = Signal active
  • 0 V (Low) = Signal inactive

This ensures reliable detection of the clamping status as well as high process reliability during automatic tool change.

SPINOGY motor spindles offer various options for temperature monitoring:

PTC on the motor winding head (standard equipment):

  • Integrated temperature sensor as standard
  • Switching threshold for overtemperature monitoring
  • Connection to the drive → automatic shutdown if threshold is exceeded.

Additional PTCs (optional):

  • Integration at the front and/or rear bearing possible
  • With multiple sensors: Cascade connection
  • Triggering of a sensor causes the spindle to shut down.

PT100 (optional temperature measurement):

  • Can be installed on the motor winding head as well as on the front and/or rear bearings.
  • Continuous recording of actual temperature values
  • Ideal for monitoring and predictive maintenance

The speed control ensures that full torque is available starting at 0 rpm. Without speed control, a maximum torque is only available starting at around 5,000 rpm.

Practical advantages:

  • Full torque even at low speeds
  • Ideal for drilling and threading operations
  • Ideal for heavy-duty machining
  • Particularly powerful in the lower speed range when combined with 4-pole motors.

SPINOGY motor spindles can be equipped with various speed sensors.

  • Inductive speed sensor (Standard configuration for ATC and DTC)
  • Analog 1Vpp Encoder (sin/cos)
  • Digital TTL-Encoder

Application:

  • Speed monitoring
  • Speed control
  • Absolute positioning of the spindle shaft (only possible with an encoder)

Yes, rigid tapping is possible with SPINOGY milling spindles.

Requirements:

  • Encoder option for precise position monitoring of the spindle shaft
  • 4-pole motor option recommended for optimal torque in the low-speed range

Yes – SPINOGY motor spindles can also be used for drilling. We recommend the 4-pole motor option for this purpose.

Purge air is a stream of air used in many motor spindles to protect the bearings from dust, chips, or liquids.

Disadvantages of conventional purge air systems:

  • Constant supply of compressed air required.
  • High energy costs, especially during continuous operation

SPINOGY solution:

  • No purge air required → no additional energy costs.
  • Bearing protection via an innovative 5-stage labyrinth seal

Effective protection against foreign particles without compressed air

Starting from a quantity of one, every SPINOGY spindle can be individually personalised. There are two options:

  • Personalization: Your own logo on the right or left side of the spindle
  • Branding: We omit our logo from the front of the spindle and laser your logo onto it instead