Saturday, March 28, 2020

Industry-standard NEMA 17, 23, and 24 Integrated Stepper Motors

Integrated Stepper Motor systems combine high-performance microstepping drives with high-torque stepper motors to provide simple and accurate control of position and velocity where open or closed-loop control is desired and cost is a factor.

SureStep integrated drive/motor units provide accurate position and speed control with microstepping to smooth motion and step response. “E” models include encoders. Advanced “R” models include indexer, communication options and more.


ISD08-30

Features - Integrated Motor / Drives
DC power supply required (12-48 VDC or 12-70 VDC)
Pulse/Direction or CW Pulse/CCW Pulse or A/B Quadrature
Digital input filtering
“E” models include an encoder
  (externally-wireable for Standard models, internal-only for Advanced models)
Three optically isolated digital inputs, 5 to 24 volts
Step input signal smoothing (microstep emulation), performs high resolution stepping by synthesizing coarse steps into fine microsteps
Dynamic smoothing, software-configurable filtering for use in removing spectral components from command sequence, reduces jerk, limiting excitation of system resonance
Anti-resonance (electronic damping): raises the system-damping ratio to eliminate midrange instability and allow stable operation throughout the speed range of the motor
Idle current reduction range of 0-90% of running current after a delay selectable in milliseconds (Standard models = 50/90%, DIP switch selectable)
Configurable hardware digital noise filter, software noise filter
Non-volatile storage, configurations are saved in FLASH memory on-board the DSP
Dynamic current control, software configurable for running current, accel current, idle current, to make motion smoother and the motor run cooler.

https://forum.core-electronics.com.au/t/cnc-power-supply-for-nema-17-motor/7460
https://www.edaboard.com/showthread.php?389275-Nema-17-vs-Nema-23v-for-3d-Printer

Friday, March 6, 2020

Why should I buy your stepper motors from oyostepper.com?

We get this question a lot: "Company XXX sells stepper motors with a super high stall torque (oz-in) rating -- won't I get better performance from these higher torque motors"? The answer may surprise you!

Why should I buy your stepper motors from oyostepper.com?


Unfortunately, the main statistic advertised on stepper motors is probably the least useful of all -- stall (or holding) torque, which is the torque the motor puts out when it is not moving. This isn't terribly helpful, as your motor isn't doing any work when it's standing still! All steppers run at less than their stall torque, so what's far more important is the usable torque of the motor throughout its RPM range. The "flatter" this torque curve, the more usable force (for accelerating and decelerating) you'll get out of your drive system.

All stepper motors also put out less torque the faster they rotate. There are two key values that you should be looking for in a motor that influence its performance: current and inductance. First of all, you should look for a motor with a current rating that is less than or equal to the current rating of your motor driver. Motor torque scales linearly with current, so if you are (for example) driving a 5A motor at 3.5A (the maximum the G540 drive can put out), you are only getting 70% of the motor's rated torque. All other things being equal, a 425 oz-in, 5A motor running at 3.5A will actually achieve less torque than our 420 oz-in motors running at 3.5A.

The other important thing to look for is the motor inductance. The lower the inductance, the slower the motor builds up "back EMF voltage", which reduces the torque of the motor. While higher inductance can be overcome with higher voltage power supplies, this adds extra heat and expense to a system.

We invite you to look at competitor offerings, and see for yourself why our motors are better. We offer nema6-nema 23 steper motors that are matched to the current ratings of the drivers we sell. Our motors are also low inductance, 2 mH for our 960 oz-in motors and 3.0 mH for our 420 oz-in motors, both of which work great with commonly available 48V supplies.

So don't fall for the hype -- with our motors, we've had customers gain 3x speed increases over motors with higher rated stall torques. We've tested our motors and competitor motors with our mechanical systems to find the best value for you. Buy from a name you can trust to get the most out of your machine.



Monday, February 17, 2020

Stepper motor types and operation

There are various types of best stepper motors, divided into linear or rotational constructions, with 1 to 5 control windings.
Based on the constructi

on of the magnetic circuit there are three main types of motors:
Variable reluctance – reactive type;
Permanent magnet – active type;
Hybrid. 
Variable reluctance (VR) stepper motors have uniformly distributed teeth, made of iron, on both the stator and the rotor, control windings being mounted on the stator’s teeth, while the rotor is passive. By energizing one or more phases, the rotor will turn in such manner that the magnetic field lines should follow a minimum reluctance path, i.e. the rotor’s teeth must align themselves either with the teeth on the stator, or with the bisectrix of the stator’s electromagnetic poles.
Permanent magnet (PM) stepper motors have a different construction, here the teeth on the rotor are made of permanent magnet material with poles set up in a radial fashion, the stator construction being similar. When the stator windings are energized, magnetic fields that are generated interact with the PM’s flux, generating torque to move the rotor.
Stepper motors have power ratings ranging from the Microwatt domain to not exceeding a few Kilowatts, thus being preferred in low to medium power applications, where precision high-speed movement is required, rather than in heavy duty applications where torque is a key factor. These motors employed in plotters, disc drives, printers, robotic arms, CNC machines and others of the type.
Hybrid stepper motors for sale represent a combination of the other two types, and are the most common type of stepper motors employed. In a hybrid stepper, the rotor is made from a permanent magnet, mounted length-wise, with two ferromagnetic toothed crowns, mounted at both ends of the magnet, so that the teeth of one crown are north poles and the ones on the other crown are south poles.

Wednesday, February 12, 2020

What Is the Pulse Needed to Move a Stepper Motor?

The keyword “pulse” is a word most people have heard of one place or another, but not necessarily when dealing with electrical circuitry. When talking about circuits, pulse typically refers to periodically spaced square wave pulses, which are waves produced from the on-off or high-low variations in power.

What Is the Pulse Needed to Move a Stepper Motor?


5b7f5d5c41d6d0f75a2b8a0680af8d05

Figure1 An example of a pulse signal

By switching power on and off at a fixed width, a variety of parts can be moved. This process is called PWM (Pulse Width Modulation); it is an often-heard keyword when working with electrical motors. The commonly-used analogWrite() function for the Arduino is produced by PWM signals.
How Works the PWM from the AnalogWrite Function?

PWM

Figure2 PWM signal

We used analogWrite() earlier in this series to control the brightness of LEDs. The maximum output voltage per pin for the Arduino UNO is 5V, but the output value (0-255) designated by analogWrite(pin, value) does not actually produce 5V divided into 256 parts. Instead, the Arduino’s pulse cycle takes an average of 5V time and 0V time to generate a pseudo-output similar to analog voltage. Until now, we have been using PWM without knowing it.

* For example, an input of analogWrite(PIN, 128) does not produce a voltage of 2.5V from the pin. Instead, half of the cycle period is at 0V and the other half is at 5V for an average of 2.5V.

Stepper Motor Driver Kit L6470

The stepper motor itself can be controlled simply with PWM, but it is difficult to directly send signals from the Arduino to a stepper motor. Today we will be using a motor driver kit called L6470 to easily control the stepper motor.

DSC_0142

Picture2 L6470 Motor Driver Kit

DSC_0143

Picture3 Parts Set

This driver kit set requires several parts to be soldered onto a circuit board. If you follow the accompanying manual, it should not be a problem.

After soldering, we connect Arduino, the best stepper motor and the stepper driver kit. This time, we attached a 12V 1.5A AC adapter to the 8V-48V part of the motor.

https://www.bloglovin.com/@larbimahieddine/stepper-motor-control-by-varying-clock-pulses
http://www.fxstat.com/en/user/profile/zhidaowozzou4-182008/blog/34451057-Stepper-motor-for-a-mechatronic-application-is-so-important

Tuesday, February 11, 2020

Grade Description for Stepper Motor Insulation Materials and Heat Resisting Materials

UL classifies the certification grade of insulation system into Y A E B F H C from low to high according to heat-resistance temperature.
The followings are the maximum allowable operating temperature(℃)for each heat-resistance grade, which can be as the brief description for insulation materials of heat-resistance grades.

17HS19-2004S1


1.For grade Y material, the maximum temperature of best steppin motor is 90℃, which has such insulation structure that is composed with untreated spun cotton, silk, etc. or their combination, so it is not necessary to do any treatment before using.
2.For grade A material, the maximum temperature is 105℃, which has such insulation structure that is composed with treated or soaked dielectric medium, such as spun cotton, silk or paper, etc. soaked in transformer oil or their combination.
3.For grade E material, the maximum temperature is 120℃, which has such insulation structure that is composed with synthetic organic film, synthetic organic enamel, etc. or their combination.
4.For grade B material, the maximum temperature is 130℃, which has such insulation structure that is composed with mica, glass fiber, asbestos, etc. which are bonded, soaked or applied by proper resin and other inorganic materials, proper organic materials or their combination.
5.For grade F material, the maximum temperature is 155℃, which has such insulation structure that is composed with mica, glass fiber, asbestos, etc. which are bonded, soaked or applied by proper resin and other inorganic materials, proper organic materials or their combination.
6.For grade H material, the maximum temperature is 180℃, which has such insulation structure that is composed with mica, glass fiber, asbestos, etc. which are bonded or soaked by proper resin (e.g., organic silicon resin) and other inorganic materials, proper organic materials or their combination.
7.For grade C material, the maximum temperature is 180℃, which has such insulation structure that is composed with mica and glass fiber which are bonded, soaked or applied by proper resin and untreated mica, ceramics, quartz, etc. or their combination.

See more:
https://www.tripoto.com/trip/faq-of-linear-stepping-motor-basics-you-shold-know-5e427217da5ef
https://izistepperfaq.blogspot.com/2020/02/3-methods-to-reduce-high-temperature.html