Why stepper motor stalls

Hope this helps. Last edited by ftl ; , PM. Bruce Griffing. In addition to the inductance limiting speed, there is another thing to look out for called mid band resonance. Google stepper motor and mid band resonance. Most ordinary steppers work best in half step mode. The torque really falls off fast after around steps per second on older motors. If you can stand the wasted power try running them without chopping at full voltage and use a power resistor to limit the current in each winding.

That greatly reduces the back emf and also controls resonances. Another way to deal with resonances it to use a damper on the motor shaft. It seems counterintutive to add mass to the armature but it does work. A proper damper has a viscoelastic fluid with movable elements inside to absorb vibrations.

Free software for calculating bolt circles and similar: Click Here. PDF Benta. Paul- It is not uncommon to use a voltage times higher than the voltage required to produce the current limit. This is done to beat the "inductance limit".

If you have an 8 lead motor and are driving it with a bipolar driver I think you are , then the best configuration is with the coils in parallel. I would also recommend reading the FAQ's on the Geckodrive site. Good information. Your step motor is in mid-band resonance. Mid-band resonance is suppressed with 2nd-order damping rate damping. Electronic damping does the same thing without degrading performance. Technical stuff: For those who are interested, step motors are mass-spring systems so they have a 90 degree phase relationship between force and velocity.

The motor drive is a current source at low speeds that has a 0 degree phase lag. This makes the loop phase lag 90 degrees and the motor is stable. As speed increases, the drive must revert to a voltage source as inductive reactance and not the drive set current begins to limit current. A voltage source introduces another 90 degrees of phase lag for a total of degrees.

A degree phase lag and a gain above unity defines an oscillator and that is exactly what the motor does. It takes about 1 to 10 seconds to build to this amplitude and the motor makes a growling or warbling sound prior to stalling. Hybrid and EV Solutions. Battery Management Systems. Cooling Systems. DC-DC Converters. Engine Cooling Fans, Pumps and Compressors. Inverter Systems. On-Board Chargers. PTC Heaters.

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That works perfectly. Agreed that speed is no issue here. So question now is if setup is ok with Nema Due is so fast that slow drivers can loose steps as high signal is too short and not detected by driver. So you should maybe study what the requirements of your stepper driver are regarding timer and if they deliver the right power for a nema You can increase stepper delays in configuration. The data sheet on my driver doesn't say anything about timer, but max pulse frequency is khz.

They are made for nema23 so power isn't the problem. Recent Posts. Calculating Reflected Inertia for Linear Systems cont. Bob Parente September 26, SEM May 16, Custom Products. Reach Us. Contact Us. Need Information? Quick links. Part Builders.