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    All You Need to Know About Stepper Motor

    Posted by: Allen Padilla Posted on: October 27, 2021 ,

    A stepper motor driver is an electronic device that is used to drive the stepper motor. By itself, it usually does nothing and must be used together with a controller like PoKeys57CNC.

    There are a lot of different types of stepper motor drivers but in general, all do the same thing – move stepper motors.Does a stepper motor need a driver?

    Yes. Stepper motors require voltages and/or currents that the controller simply can’t produce. Therefore we need to use a stepper motor driver. This electronic device will transform our movement instructions from a controller into a sequence where the winding in the stepper motor will be turned on or off while still providing enough power to it.

    You can also buy step motor at https://www.automationtechnologiesinc.com/products-page/stepper-motors.

    NEMA23 185oz/in 3A Stepper Motor Dual shaft (KL23H256-30-4B)

    All of this we of course be produce by a microcontroller driving a few FETs but the design and the programming would take time. Thankfully there are already existing solutions.

    If we summarize, controllers are in general a pure digital devices with low power output capability so we use an analog power stage as an interface between digital (controller) and mechanic (motor) world.  

    How does stepper motor drivers work?

    The basic task of the driver is to generate an appropriate signal from the input data to move the motor axis. The most common approach driving a stepper motor we call H-bridge. H-bridge circuits consist of 4 FET transistors with very low resistance between drain and source contact (RDSon) when in active state. In general we need at least two H-bridges since the motor has minimal two coils. With right signals combination on FET’s gate we control a current direction through motor’s coil. Alternating excitation of two windings causes the motor axis to shift.

    Forward and reverse coil driving

    How do I choose a stepper motor driver?

    When choosing the right driver for our system, we first need information about the motors we will be using. This is the main important information. We have to choose the driver according to the power stepper driver can deliver to the motor.

    For example, bigger motor like NEMA 34 has a higher holding torque value than smaller NEMA 17. That’s why NEMA 34 consume more current and we need a driver with higher amperage characteristic.

    How to Troublshoot Servo Motors and Stepper Motors

    Posted by: Allen Padilla Posted on: October 18, 2021 ,

    Stepper motors and servo motors have some similarities and many differences. In general, stepper motors are controllable in steps without feedback whereas servo motors require a feedback device to make adjustments accordingly.

    Troubleshooting these two staples of industrial machinery is not all that complex when you have a basic understanding of electricity and some proficiency using a multimeter. A general familiarity with motors and their operation and design is an added advantage as well.

    Stepper motors and servo motors can be found in virtually every industrial environment these days. The complexity of industrial machines and the modern controls that make them so efficient usually feature a servo motor or stepper for some type of motion control. Mechanical ratchets and gears, as well as a human-guided movement, have long been replaced by these precision motors.

    You can buy stepper motors by visiting www.automationtechnologiesinc.com/products-page/stepper-motors.

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    Before beginning any troubleshooting of industrial equipment, the maintenance personnel or the individual responsible for troubleshooting and repair should take all steps required to ensure his or her own safety and the safety of those in the area of the machinery. Proper lockout, tagout, and verification that the machine is energy-free are the responsibility of everyone involved in the troubleshooting.

    We need to remember that the motor is just one part of a motion control system. Once you have verified that the rest of the system is functioning normally, you can then proceed to determine if the motor has failed using a few simple tests. These tests can be performed using a standard multimeter or a megohmmeter if one is available.