Stepper Servo Control, New Velocity ICs, and Fix Servo Motor Noise

Featured in this edition of Motion Control News

• New Control Technique Combines Servo Performance With Step Motor Cost
  When it comes to step motors, a new drive technique called stepper servo has some engineers believing they have found the holy grail of positioning motion control - the high performance of a servo motor with the low cost of a step motor. In this article we will explore the benefits and limitations of the stepper servo control technique, also called closed loop stepper, and explain why it is attracting serious attention from machine designers.
  
  
• New Low Cost ICs Provide Advanced Velocity Control of Servo Motors
  The Juno MC71113, MC73113, and MC78113 are newly released ICs that provide velocity control of 3-phase Brushless DC and DC Brush motors with advanced features such as PI velocity loop control, programmable velocity estimation, dual biquad filtering, shunt regulation, deadband filtering, FOC (Field Oriented Control), and more.
  
  
• My Servo Motor Is Making A Lot of Noise
  A noisy or chattering servo axis is perhaps the single most common motion problem that engineers encounter when building their DC Brush or Brushless DC motor-based machine. This is not only annoying but can cause increased wear and tear on the motor and downstream mechanisms. The problem can occur both when the servo motor is holding position, and when it is moving - although the sound characteristic may be different for each of these conditions.
  
  
• Mathematics of Motion Control Profiles
  Trajectory generation techniques such as 7-segment S-curve profiles, asymmetric acceleration and deceleration, continuous contouring, and electronic CAMming are standard features in modern machine design. They provide engineers the tools they need to make controlled loads move faster and more efficiently. This paper will take you through the mathematics of motion profiles, discuss which profiles work best for which applications, and provide insights into how modest changes in the profile parameter settings can create big improvements in throughput.

CLICK HERE to subscribe to Motion Control News.