Knowledge Base
Knowledge Base

Hybrid Stepper System

  • Step Motor – Basic Structure & Operation
    • • Operating Principles

      In response to each individual control pulse and direction signal, the drive applies power to the motor windings to cause the rotor to take a step forward, a step in reverse, or hold in position. For example, in a 1.8-degree two-phase step motor: When both phases are energized with DC current, the motor will stop rotating and hold in position. The maximum torque the motor can hold in place with a rated DC current is the rated holding torque. If the current in one phase is reversed, the motor will move 1 step (1.8 degrees) in a known direction.

      Two-phase stepping motors are furnished with two types of windings: bipolar or unipolar. In a bipolar motor, there is one winding on each phase. The motor moves in steps as the current in each winding is reversed. This requires a drive with eight electronic switches. In a unipolar motor, there are two windings on each phase. The two windings on each phase are connected in opposite directions.

      • The Motor Holds Itself at a Stopped Position

      Stepper motor has full torque at stand-still as long as the windings are energized. This means that the motor can be held at a stopped position without using a mechanical brake.

      • Motor with Electromagnetic Brake

      Once the power is cut off, the self-holding torque of the motor is lost and the motor can no longer be held at the stopped position in vertical operations or when an external force is applied. In lift and similar applications, an electromagnetic brake-type motor is required.

  • Introduction to Stepper Motors
    • A stepper motor is an electromechanical device that converts electrical pulses into discrete mechanical movements. The shaft of a stepper motor rotates indiscrete step increments when electrical command pulses are applied to it in the proper sequence.

      Stepper motors are the easiest devices for precise positioning control. They are wildly being used in various applications for position and speed via all kinds of control signals such as digital, analog, communication, etc.


      •Precise Positioning Control

      A stepper motor rotates with a fixed step angle, just like the second hand of a clock. This angle is called the "basic step angle." PrimoPals' offers several types of "basic step angle" as standard motors: 2-phase stepping motors with a basic step angle of 0.9° and 1.8° and 3-phase stepping motors with a basic step angle of 1.2°.

      •What is a Pulse Signal?

      A pulse signal is an electrical signal whose voltage level changes repeatedly between ON and OFF. Each ON/OFF cycle is counted as one pulse. A command with one pulse causes the motor output shaft to turn by one step.

      The signal levels corresponding to voltage ON and OFF conditions are referred to as "H" and "L," respectively.

      •Generating High Torque with a Compact Size

      Stepper motors generate high torque with a compact size. These features give them excellent acceleration and response, which in turn makes these motors well-suited for torque-demanding applications where the motor must be started and stopped frequently.

  • PrimoPal's step motor advantages
    • These step motors from PrimoPal include a number of improvements for even greater performance and value:

      • Many refinements that increase torque by an average of 20%

      • Complete range of sizes: 8, 11, 14, 16, 17, 23, 24, 34, 42

      • Size 17 and larger 2 phase motors are UL recognized

      • 0.9 degree 2 phase motors, and 3 phase motors for extra smooth, quiet, performance

      • PowerPlus technology: for maximum efficiency and performance at all speeds

      • Lower inertia rotors provide faster acceleration

      • High voltage insulation for use with high voltage, high performance drives

      • Low loss stators have better high speed performance

      • Standard windings with high fill for more torque

      • Updated model numbering system includes a wider range of windings and standard options

  • Comparison of Hybrid and Permanent Magnet Linear Stepper Motor
    • The average efficiency of hybrid motors is about 65%, while the efficiency of permanent magnet motors is about 25%.

      The first reason is that the hybrid motor uses a silicon steel laminated stator assembly , Compared with the stator assembly formed by stamping and forming of mild steel of permanent magnet motor, the laminated stator of hybrid motor has smaller eddy current loss and the silicon steel material in the laminated structure can reduce hysteresis error;

      Therefore, the overall iron loss of the hybrid linear motor is smaller than that of the permanent magnet motor, so the efficiency of the hybrid motor is higher.

      At the same time, the step angle of the hybrid motor is 1.8 degrees or 0.9 degrees, compared with the step angle of 15 degrees or 7.5 degrees of the permanent magnet motor, and the resolution of each step is increased to 0.000060 inches [0.001524mm]. At 0.00025 inches [0.00635mm], hybrid motors have better positioning performance.

  • question
    • Unless otherwise specified, all the screws of our company are made of 303 precision cold-rolled stainless steel, and the nuts are made of engineering plastics (polyacetal resin).

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