Position measuring devices that rely on the principle of mutual induction include resolvers, linear variable differential transformers (LVDTs), and inductive encoders. Two of these technologies — resolvers and LVDTs — are based on the construction and operation of a transformer. In the case of an LVDT, voltage is applied to a primary winding and induced in […]
Search Results for: linear encoder
New spring-loaded pivot arm for wheel-encoder assemblies
POSITAL has introduced a new spring-loaded pivot arm mounting system for wheel-encoder assemblies. Like earlier spring-loaded mounting brackets, this device is designed to minimize slippage by maintaining a steady contact pressure between the wheel and the moving surface. However, the pivot arm can accommodate larger lateral movements of the moving surface. Spring tension can be […]
New miniature linear voice coil motors from Moticont
The new LVCM-010-013-01 linear voice coil motor from Moticont is only 0.375 in. (9.5 mm) in diameter and the length at mid-stroke is just 0.81 in. (20.7 mm) long. However, this new miniature voice coil motor has a high force-to-size ratio with a continuous force of 1.0 oz (0.28 N), a peak force of 3.2 […]
What is a gated index pulse for incremental encoders?
Incremental encoders typically use two square-wave signals in quadrature (out of phase by 90 degrees) to track position and direction of motion. But because they only track incremental position (not absolute position) they’re not able to determine the true position of the motor and connected equipment after a shut-down or power loss. So most incremental […]
Encoders for functional safety-rated machines from HEIDENHAIN
For those needing Functional-Safety-rated (FS) contamination-resistant encoders for machine feedback, AMO (a HEIDENHAIN brand) introduces FS absolute angle and linear encoders. While Functional Safety-rated machines are a standard requirement in the European Union, machine manufacturers outside the EU are now seeing the benefit of including FS in their machines. With these encoders in use on […]
New precision linear stage family for ultra high vacuum applications
PI (Physik Instrumente) LP has introduced a new high precision linear translation stage family for High Vacuum (HV) and Ultra High Vacuum (UHV) applications. The L-509 vacuum stage series is offered for 3 different vacuum levels: 10-6 hPa, 10-7 hPa, and 10-9 hPa. Linear motion ranges of 26mm, 52mm, and 102mm are available. The precision-ground […]
Trends 2020: New applications drive encoder design trends
Encoders are central to motion control applications. They can provide position, speed, and direction feedback to a controller or drive to increase the accuracy and reliability of a drive system. As technology evolves, so too do encoders, incorporating the latest advancements in communications and networking and offering engineers tools to solve challenges they face across […]
Magnetic encoder system with Drive-Cliq interface from Balluff
Balluff’s BML absolute magnetic encoder in the SGA series stands out in any application where high absolute accuracy of position and end-of-travel is required. Comprehensive diagnostics functions ensure reliable operation and more efficient maintenance. With its Drive-Cliq interface the Balluff measuring system can also be easily integrated into Siemens controller environments, with Siemens having certified […]
What is a sine encoder (aka sine-cosine encoder)?
A sine encoder is similar to an incremental encoder in design and function. Both devices measure either rotary or linear position changes and direction, and both are available with either optical or magnetic sensing technology. The primary difference between the two is that sine encoders supply position and direction information as 1 Volt peak-to-peak (1 […]
What happens when a multi-turn encoder reaches 4096 turns?
One of the first decisions when choosing a rotary encoder is whether it should provide incremental or absolute position feedback. That choice primarily depends on whether the encoder should be able to exactly detect its position upon startup. If so, then an absolute encoder is typically required. When considering an absolute encoder, the next decision […]
