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Can stepper motor use electrical braking?

by zuobian youbian (2018-05-15)


Hold on! No, it’s not an 80’s song. We receive calls on a frequent basis about applications requiring a holding brake. Typically in vertical applications, where the position of the load cannot be maintained when power is turned off, a spring-applied-power-off brake can be used to maintain the position of the load. Since 1978, the stepper motor online has specialized in offering two-phase, hybrid step motors in a variety of frame sizes. These motors are designed to work optimally with Applied Motion stepper drives, ensuring smooth motion and high performance in every application. Add an encoder to the rear shaft of an Applied Motion step motor, marry it to an Applied Motion drive equipped with encoder-feedback functionality, and dramatically improve system performance.

Nema 23 Stepper Motor Drive 24-50VDC 1.5A-4.5A 256 Microstep M542T

The chip automatically provide a reduced holding current, as section 5 in data sheet, to maintain holding torque and shaft at sub-degree accuracy, once motor is stopped. Holding torque and sub-degree shaft accuracy is one of the advantage of stepper. In 'typical use' stepper is locked so that it trace out a precise profile, like page 14 of data sheet for micro stepping, as used in floppy disk drive, many industrial CNC machines and 3D printer 3D printer stepper software. An added benefit of this style of brake is it typically has a larger output bearing that allows for greater axial and radial loading than the stepper motor alone. No for 'typical' use, especially when use with standard IC chip, like TB6560, which you sent a step-pulse and direction signal and it does the rest automatically, data sheet.

Of course, one can open circuit the coil or short circuit the coil, if needed. I think I can stop a running stepper motor more quickly with an electrical braking resistor. Is this feature popular among stepper motor controllers? I am a little confused that most manuals of stepper motor driver don't say about electrical braking resistor or other electrical braking method. Our nema 11 stepper motors, 23 and 34 frame stepping motors allow easy installation of NEMA frame size, modular, front-mounted brakes from Inertia Dynamics or Electroid. These brakes simply mount to the front face of the stepping motor of the same NEMA size. The installation is easy and requires no mechanical modification of the motor. The motor shaft simply slides into the bore of a split style, compression coupling which is tightened to a specification and you’re done.

Nema 11 Stepper Motor Bipolar 1.8 deg 6Ncm (8.5oz.in) 0.67A 3.8V 28x28x31mm 4 Wires

To decelerate steppe motor, adjust pulsing frequency in a downward trend s to gradually slow down the stepper to zero speed. Normal, non-freewheeling, stepper motors generally require no braking... especially if they're used to drive a mechanism with high mechanical advantage. BUT... any stepper motor CAN be forced to a stop by short-circuiting the leads together, in pairs. That must be done VERY carefully (see below), only when NO power is being supplied to the motor by its driver. Circuit and/or software design must be done very carefully to ensure that short-circuit braking never occurs while the motor is still under power - even a momentary short-circuit for braking purposes may destroy the driver electronics.

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