Hollow shaft motors SPINDASYN

Power and Precision

A modular and compact mechatronic unit that consists of a powerful servo motor with an axial bearing and an integrated mutliturn absolute encoder.

In connection with screw-nut systems the hollow shaft motor results in a ready to use linear drive.

• Rated torque: up to 560Nm
• Peak torque: up to 1500Nm
• Dynamic axial forces: 18kN – 210kN
• Static axial forces: 48kN – 570 kN
• Diameter hollow shaft: 35mm/65mm/105mm
• Convection cooled and liquid cooled

Overview

> Technical Data hollow-shaft motors
> Functionality and applications
> The SKT principle of rotating nuts
> Interface between hollow-shaft flange and screw nut
> Modular design
> Advantages

Technical Data

> Large view of technical data and type code

Functionality and applications

Anti-twist protection
In linear movements, the motor torque is applied to the screw in the opposite direction. This torque has to be braced by a linear guidance.

Companion structure
Radial loads or overturning torques reduce the life of the screw-nut systems. With the companion structure, make sure that the motor and screw-nut system are flush with each other and that no radial forces are present.

Screw-nut system
SKT motors are suitable for screw-nut systems such as roller or ball screws. As a rule of thumb, roller screws can support larger forces with smaller diameters while ball screws offer better dynamic performance and are more cost-effective.

Horizontal configuration, hollow through-shaft, One motor on a stationary screw
no limiting of strokes

Multiple motors on a stationary screw, e.g., format adjustments

The SKT principle of rotating nuts

The screw nut is directly connected to the hollow shaft of the motor. The direction of rotation of the screw nuts is converted to the linear movement of the screw. Here, the screw only moves linearly and does not rotate. The direct drive of the screw nut offers many advantages, especially compared to systems with rotating screws. Thus, higher speeds of movement are possible with the direct drive and the torsionally stiffness connection to the screw nut allows for better dynamic performance. With the SKT series, the dynamic performance, torsional stiffness and precision no longer suffer the negative effects from mechanical transmission elements such as belt drives or couplings. The motor bearings take up the high forces directly so that heavy duty applications are possible. Hence, machine design becomes much simpler. The SKT series also allows for completely new solutions to be developed, such as multiple SKT motors on a stationary screw.

Interface between hollow-shaft flange and screw nut

> Large view of technical data and drawing

Modular design of SPINDASYN hollow shaft motors

The SPINDASYN series is a modular system. First a motor can be choosen from the various sizes available. Next, the SPINDASYN motor can be modified for the specific forces, travel distances or cycle times for a specific application by choosing from the various motor elements:

The motor bearings can be selected for dynamic or heavy duty applications.

Options:

A customized SPINDASYN configuration

Bearing side of motor	Active component of motor	Motor end

Normal duty bearing - Lubricated-for-life, normal duty bearing with continuous lubrication depending on application - Good acceleration characteristics - Support of high axial loads - For pushing and pulling forces - Seals on both sides of the bearing offer good protection against dirt - High stiffness and low friction - For dynamic applications for sizes SKT7, SKT10, and SKT13	Convection-cooled - Various overall lengths for each size - Highly dynamic - High maximum torque - Smooth surface	Hollow through-shaft - No limits in screw stroke - Compact overall lengths - Multiturn absolute encoder - Optional hollow shaft brake

Heavy duty bearing - For highest forces in sizes SKT10 and SKT13 - Lubricated-for-life heavy duty bearing with continuous lubrication depending on application - Support of highest axial loads - Especially suited for heavy duty screws - Static forces of up to 570 kN - Dynamic forces of up to 210 kN - High stiffness and low friction	Liquid-cooled - Various overall lengths for each size - Highly dynamic - High maximum torque - Smooth surface at the end - Increase in continuous torque for shorter cycle times - Cooling circuit made of stainless steel to protect against corrosion	Blind hollow shaft - Closed end of motor - Bleeding of trapped air via front end bell - Multiturn absolute encoder - Optional holding brake

Advantages

Flexibility via modular concept

The modular design of SPINDASYN linear drives with respect to performance, screw diameter and axial force allows them to be specifically adapted to various applications. There is the choice from models with hollow through-shafts or blind hollow shafts, so that there is the option of limiting the strokes or not.

Energy efficiency

Compared to hydraulic systems and linear direct drives, SPINDASYN offers significantly higher efficiencies. Thus the customer achieves a better overall energy efficiency.

Extremely compact design

Since SPINDASYN includes an integrated screw, an entire linear drive with minimal dimensions can be designed. All of the functional elements such as the servo motor, bearing, DIN fitting for screw nuts, holding brake and encoder system are concentrated together as a compact unit within a single enclosure.

High stiffness

The integrated bearing eliminates the need for shaft couplings and significantly reduces the number of bearing points required. With the stiffness enclosure and the amply dimensioned power-train components, the entire system provides extreme stiffness.

High dynamic performance

Since the design is extremely compact, the moment of inertia is also very low. The servo motor offers high power and acceleration ratings as well as high overload capacity. Of special note, the torsionally stiffness connection to the screw nut allows very dynamic controller settings to be used.

Reduced design complexity

The ready-to-install unit consists of a servo motor, heavy duty bearing and multiturn absolute encoder and can be connected directly to a screw nut.

IP54 protection rating

With IP54 protection rating, these motors are also suitable for harsh environments.

Installation at any location

Fitted with sealed bearings, SPINDASYN units can be installed in any location. According to customer application, the bearings can also be re-lubricated.

Maintenance-free operation

Since SPINDASYN uses high-torque motors with sealed enclosures, they are practically maintenance-free and offer high availability. The integrated temperature sensors protect the motors against thermal overloading. Depending on the lifetime lubricated angular contact ball bearings and tapered roller bearings may have to be re-lubricated.

Heavy duty applications and high speeds

SPINDASYN hollow shaft motors are an efficient alternative to existing hydraulic solutions or linear drives in applications where high loads have to be moved at various different speeds.

Highest power density through liquid cooling (optional)

Liquid-cooled motors are compact in design and offer higher dynamic performance through less moving mass. Since the motors weigh less and are smaller in size, they are also easier to install.

Vertical configuration, e.g., stroke unit, press

Bearing Side Active component motor
of motor of motor end