Using an Optical Encoder to Show RPM on a PLC

April 27, 2014

. I have interfaced a 200 line count QR145 optical encoder to a DL06 PLC. The PLC’s inputs are set up in high speed mode to receive the incremental quadrature pulses coming from the optical encoder. . CT174, the designated high speed up/down counter is used to interface to the...

Using an Optical Encoder to Measure Angles

April 23, 2014

I have interfaced a 200 LC QR145 to a DL06 PLC to show how to convert from a line count to mechanical degrees. This type of conversion may be useful for any application of optical encoder to measure angles. To calculate a degree measurement we divide 360 by the line...

Optical Encoder Incremental Signal Measurement

March 26, 2014

While most of us are familiar with how to measure something in mechanical degrees, incremental optical encoder signals are measured in electrical degrees. 360 electrical degrees is the period in which a signal completes one high to low transition. This can be in any sort of waveform, but for encoders...

How to Time Optical Encoder Commutation Channels to a BLDC Motor

March 17, 2014

Optical Encoder Brushless DC Motor Timing Using Back EMF The optical encoders we work with have a set of three Commutation tracks (U,V,W) which correspond to the three phases of the motor (R,S,T). Alignment of the optical encoder commutation signals to a BLDC motor could be thought of as being...

Why Use an Optical Quadrature Encoder for a Motor Encoder?

February 22, 2014

What is the purpose of an Optical Quadrature Encoder on the back of a motor? Incremental Optical Encoders will often provide commutation “Hall signals” for timing of the BLDC windings, but I am going to forgo that discussion and turn instead to the Incremental Encoder channels, specifically A and B...

Understanding Options on the QDH20 Industrial Rotary Encoder

November 20, 2013

The QDH20 Industrial Rotary Encoder is an IP66 sealed encoder made for the rugged duty of an industrial application. Due to the huge array of configuration options, this optical encoder has over 200,000 possible ways that it can be configured. While this is certainly an advantage to an end user...

Better Edge Determination for Rotary Encoders

September 14, 2013

A standard edge sensing scheme for optical rotary encoders is to square up the raw analog sine wave by comparing it against a given voltage. If your analog signal has a 2Vpp amplitude, the value at which you switch off of, creating the edges of your square waves, could be...

E-mail on Creating a Post Quad Encoder Signal

August 13, 2013

We see that this sampling rate essentially correctly "maps" the waveform, introducing some phase shift error. Depending on where sampling occurs this error may be as high as just under 90 electrical degrees, but does not directly give you 4X the frequency.

Interlaced Sensor Technology in Rotary Incremental Encoders

May 13, 2013

The shadow technology sensing scheme patented by Quantum Devices Incorporated also corrects for disk centering problems such as disk eccentricity and disk wobble, where the movement and alignment of the disk varies in three dimensions, and normally creates variations in signal amplitude and ultimately output signal.

Log In

Forgot Password?

Create an account

Create an account to gain access to all of our 3D models!

Create Account

Create an account to gain access to all of our 3D models!

Forgot Password