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LG Motion launches new resolver product from Empire Magnetics Inc.

28 September 2018

Harsh environments require resolvers to be installed as feedback devices. However, very few of the stepper drives/controls are configured to support resolvers.

To counteract this, Empire Magnetics have for many years provided an RDE product to support the resolver and output Encoder type A, B, Z signals. While an acceptable interim solution, the RDE has resulted in some customers having issues with loss of power, culminating in loss of position, and for multi-turn applications, absolute position information is better than incremental. Empire Magnetics Inc. has addressed both these issues in their new ERD product. 


• Retained the primary function of the resolver to encoder A, B, Quadrature and Z reference signals (for those happy with incremental feedback) 
• Added an up-down counter that tracks absolute position over many turns that captures the last position in the case of power failure. This absolute position information is available via Ethernet. Commands to zero or install an offset number are available.

Incremental resolution is set at 1,024 cycles per revolution. Common quadrature detection circuitry will de-code this to provide 4,096 counts per revolution. However, a jumper change on the board supports a resolution of 16,384 counts per turn of the resolver. 

The up-down counter has a range of - 2147483648 to + 2147483647 counts. 

At a resolution of 4,096 counts per turn of the resolver, the unit supports 524,288 turns in either + or - direction from the zero point. Operating in a mode where the direction reverses will keep the counters centred around the zero reference.

LG Motion UK based motor and control specialist

LG Motion design and manufacture a wide range of motion control products complemented by close partnerships with internationally recognised specialists in diverse motion control solutions such as US based Empire Magnetics.

If you would like to learn more about the products and services offered by LG Motion, or if you have an application that you would like the team of engineers to advice upon please contact: 
Tel: 01256 365600

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