Product Description

The DH081M-12-1310 is designed and manufactured by Kollmorgen. It is a direct drive rotary (DDR) motor that offers repeatability and increased precision. An accuracy planetary gearbox can have a 1 arc-minute backlash. With an absolutely stationary drive motor, this can cause the load to move by 1 arc-minute. The repeatability of Kollmorgen’s DDR motors is better than 1 arc-second. This means that a DDR motor has the capability of holding a position 60 times better compared to a traditional motor/gearbox.

A DDR motor can carry a small price-premium in contrast with a gearbox/ motor with a similar torque. However, there is an overall reduction in cost when removing the parts as well as the labor of all additional components needed in a mechanical transmission servo system. Another benefit of the DH081M-12-1310 is that the motor has no inertia matching. Mechanical transmission servo systems need inertia matching that restricts the replicated load inertia at 5 to 10 times the motor inertia. If this restriction is not met, it becomes difficult to control the system because of issues with instability.

Often, inertia matching restrictions of mechanical transmission systems compel machine designers to use a bigger motor than needed just to comply with the requirement of inertia matching. DDR motors do not need such sizing conventions. Since the motor is fixed directly to the load, the motor inertia and the load are common inertia. This means that no inertia matching is needed when using the DH081M-12-1310. DDR motor applications have operated with inertia ratios greater than 11,000:1. The DH081M-12-1310 also comes with a reduced audible noise. The audible noise levels of machines that are integrated with DDR motors are as low as 20 dB lesser than similar machines with a mechanical transmission.