Motion System Design
Rugged encoder stands up to shock, vibration

Rugged encoder stands up to shock, vibration

One of the most trusted feedback devices is the tried and true rotary encoder. However, shock loads can easily break these delicate devices: The glass discs that provide a clean light path for sensor reception can also shatter when subjected to the rough conditions of many motor applications.

Now the HS35R vector-duty encoder, a newly redesigned hollow-shaft rotary encoder from Dynapar Corp., Gurnee, Ill., stands up to a 400 g shock load with a disc made of hard plastic instead of glass. Meanwhile, another new feature prevents disc crashes in the first place: The encoder's ASIC phased array sensing module is further away from the disc, for a gap that is up to 10 times wider than that of a typical mask-on-sensor. The result? A more forgiving arrangement that helps eliminate damaging interference during shock loads.

The final improvement is bearing structure: Larger bearings carry more load and last longer, and are “captured” with retaining bolts to improve manufacturability and resistance to runout. Traditional encoders use adhesive to secure bearings to the shaft hub, but vibration can cause failure.


On display: HS35R vector-duty encoder

Key features: Rugged design withstands 400 g shock; larger, well-secured bearings increase resistance to runout; improved sealing protects against contamination.

What it means to you: Reliability in tough applications; apply anywhere a vector motor is in use.

What else: Rigid plastic used in place of glass gives resolution to 5,000 PPR and allows an operating temperature range from -40° to 100° C, useful when mounted to hot vector-duty motors.

Innovator: Dynapar Corp.
Gurnee, Ill.
(800) 873-8731

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