Unipolar driver stepper-motor

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Disagree Agree. Notify of. I agree to the Privacy Policy. The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Read the complete white paper or contact an engineer. Unipolar Motors In a four-step, permanent magnet stepper motor, the rotor has a one pole-pair magnet, and the stator has two phases — Phase A and Phase B.

Bipolar Motors Bipolar motors need only one coil winding per phase. Advantages and Limitations Unipolar and bipolar motor assemblies each have their advantages and limitations: Voltage drive. A simple circuit with four transistors provides cost-effective unipolar control. A voltage drive for bipolar motors requires two H bridges.

Note : Due to the inductance effect, the current needs some time to rise in the coil. Current drive. A bipolar mode is preferable for current drives because unipolar technology requires more complex electronics to achieve less motor performance. Holding torque. Defined as the maximum torque that the motor can hold at stall, holding torque is proportional to the torque constant and the current in the phase.

The difference comes in handy when you connect them up: since a Unipolar has two groups of coils, you can wire one up for reverse, and one for forward. By the way, for those familiar with the two motor types, this may sound too simplistic — however, I read a lot of questions from people asking what the motors are all about.

Of course, a Unipolar motor can only activate one pair of its coils at a time no use turning on forward AND reverse coils together of course! This means that a Bipolar motor of the same build is roughly twice as powerful, since all the wires in it are active. But as we see, you need more external circuitry to manage a Bipolar motor, since the outside circuit has to reverse the current to reverse the motor.

This circuit, called an H-Bridge, is more complicated than the driver for a Unipolar which basically is four transistors or other power drivers, one for each line of the coils. The choice is yours; however, if you want to hedge your bets, you can often use a Unipolar motor on a Bipolar stepper motor driver.