Servomotor Terminology FAQ: What's the difference between an industrial servo motor and a hobbyist-quality servo motor?
Nippon Pulse engineers are regularly approached by hobbyists and educators looking for servo motors. But there is a big difference between wshat these novice engineers are usually seeking — two-lead dc motors — and precision industrial servo motors run off ac power with an encoder for feedback. We look at the terminology for both market segments and make sense of servos.
Design engineers run up against all kinds of issues when designing a new application – ensuring the motors meet force and size requirements, making sure the electronics to run the application are well-designed, and keeping costs down, just to name a few – and Nippon Pulse has made it our goal to help “ease the pain” of common machining concerns, with help from our patented Linear Shaft Motor and our dynamic electronics.
When choosing a stepper motor, it is important to understand four torque characteristics: pull-out torque, pull-in torque, holding torque and detent torque.
Origin return (or built-in homing) allows the controller to move the motor back to its initial, or starting, position. Every Nippon Pulse controller chip, in each of the four series, has multiple origin return sequences available, though the specific types of return modes available are dependent on the model.
The design of the Linear Shaft Motor allows you to replace the standard ball-screw system with the Linear Shaft Motor and achieve higher speed and resolution. However, to achieve the highest performance, the entire system structure must be optimized. This is a quick overview of options to consider when configuring your servo motor.
A short overview of the benefits of using a Linear Shaft Motor servo in place of other popular linear motor options, as well as benefits over conventional rotary-to-linear systems.
An OEM small-batch manufacturing customer came to Nippon Pulse because their current supplier’s motors had a very high failure rate for the newest generation version of their application. The new generation required accuracy from the motor that 50 percent of the delivered motors could not meet. The customer contacted us and requested a sample to evaluate, which – when tested – was well within their resolution and accuracy requirements.
When it comes to developing a new application, you have many options for control: all-in-one controller boxes, integration-ready boards, and ASIC chips for complete customization. What factors should be taken into consideration when selecting a motion controller option?
A basic need of the machine design is to be able to go to a position, and knowing where that position is relative to the workpiece. In looking at achieving accuracy in the movement of a workpiece or the tooling, there are three areas of the machine design: the mechanical components, the command and control of the movement (control boards and servo loop), and the translation mechanism (linear motor or rotary motor and ball screw). This article is focused on one aspect of translation, specifically the force generated by linear electric motors.
There are three main direct drive linear motion systems on the market today. These three motor types have distinct advantages and disadvantages and, based on the application, one motor will be better suited than either of the other motors. This white paper will present the basic mechanism of operation of these three linear motors along with the advantages and disadvantages of each.
In order to operate a motor, you need a device or circuit that produces a speed and direction signal. In many cases, a CPU or FPGA device is used to create movement, because technically these devices can be programmed to generate pulses. However, no serious engineer should consider using these for important motion control applications, unless they are okay with a "good enough" mentality when it comes to their application's movement.
A pulse control LSI (motion control IC, ASIC) is a dedicated chip that is specialized for motion control. It is very easy to design programs when you use a convenient motion control-specific tool like a pulse control LSI. By choosing a pulse control LSI, you can easily write setting data and commands for both linear and S-curve acceleration/deceleration without overloading the CPU. When you consider CPU and engineering resource costs, ease of use, and speed of development, the end user benefits greatly from the specialized motion control option.
Linear motors have gained a name for themselves as being a high-precision and power-efficient alternative to conventional rotary-to-linear transmission systems. How is this possible? Well, let's look at the Ball Screw, which also can be considered, in its own right, a high precision rotary-to-linear transmission system. The Ball Screw is typically only 90 percent efficient. When we add the efficiency of the servo motor (range from 75 to 80 percent) and losses that will be introduced by the coupling (and if using a gear box), it is possible that only 55 percent of the power we are supplying is going towards work. When we compare the typical linear motor, where the motor is driving the load linearly, we can quickly see why the linear motor has gained a name as being more power-efficient.
With the Linear Shaft Motor, you have the ability to drive two motors in parallel using only one encoder and one amplifier. All other systems require two drives, two controllers and two encoders, connected together. How is the Linear Shaft Motor able to overcome these issues?
This document explains the difference between a servomotor and a stepper motor when connected to a servo driver. It covers the terms used in controlling the pulse train that is supplied to the servomotor by a PCL series controller. It does not, however, explain the principles of operation or the design of the motors or drivers.