Motors & Drives

Stepper Motors  |  Servos  |  VFD Inverters | DC Motors
Servo and stepper motors are the “muscle” of any electromechanical solution. The motor’s torque, speed, and position can be controlled with extreme precision, allowing for incredibly complex motion. A motor is the mechanical device that converts electricity into the rotational or linear force used to power a machine. A drive is the electronic device that controls the electrical energy sent to the motor. The drive feeds electricity into the motor in varying amounts and at varying frequencies, thereby controlling the motor’s torque, speed, and position. Here we will investigate a few common types often used in industrial automation and machine design.
Omron VFD variable frequency drive

AC Induction Motors & VFD (Inverters)

Widely used in industrial applications for over 100 years, 3-phase AC Induction Motors are rugged, reliable, and economical. Traditionally used as a fixed-speed device, modern control electronics have allowed for Inverters (or “VFDs”), which change the frequency of incoming power – and thus the speed of a motor’s rotation. This allows for significant energy savings for variable-torque applications like fans, pumps, and compressors. AC motors and drives run the gamut from very small (fractional horsepower) to the very large (multiple thousands of horsepower).
Stepper motors and drives

Stepper Motors & Drives

A stepper motor is a brushless DC electric motor that divides a mechanical rotation into a number of small, equal, discrete “steps” (commonly 200 steps/rev). Stepper Drives take an incoming control signal (often “Step and Direction” pulses from a controller) and energize the proper windings in the stepper motor to excite the commanded motion. Steppers most commonly run “Open loop” (without feedback such as an encoder) and for simple speed- or position-control applications, steppers are a cost-effective choice. Steppers are used extensively in small machines such as 3-D printers.
yaskawa servo motors and drivers

Servo Motors & Drives

Adding feedback to a motor and drive creates a Servo system, whereby the drive “knows” the position of the motor shaft at all times, and can very accurately control position, speed, and torque of the motor. Servo Motors are most commonly brushless DC motors (permanent magnet rotor, wound-coil stator) and are thus commutated by the feedback device, such as hall-effect sensors, encoders, or resolvers. Servos are more expensive than Steppers for a given size due to their additional complexity, but offer far greater performance, speed, and accuracy.
integrated motor drive smartmotor

Integrated Motion Solutions.

Traditionally, motors and drives are separated by cables for power and feedback. Integrated motors package the amplifier (and sometimes controller) circuitry directly at the motor to simplify the package. This type of motor is convenient for smaller machines since it is possible to avoid control panels full of amplifiers and (frequently expensive) servo cables. The user only needs to run power (frequently DC) and communications or I/O to the motor.
Synchronous servo motors

Synchronous Servo Motors

Stober’s EZ and EZHD synchronous servo motors, STOBER is offering brushless, permanent magnet and electronically commutated motors with different power profiles. Use STOBER’s hollow bore motor for passing media through the center of the motor or try the EZ shaft option. Stober’s ballscrew motors are compact and allow for universal mounting on a variety of manufacturers’ screws.
stober logo
EZ stober motor

EZ Series

Shaft options for applications
STOBER’s motors are dynamic and powerful offering higher torque density and stiffness. Direct mounting reduces inertia by up to 75%. These motors are plug ‘n play with a variety of manufacturers. The EZ series utilizes a shaft for connecting and is super compact and dynamic, providing a better performance.
  • 3rd Party Plug ‘n Play Connectivity
  • Holding brake – ideal for vertical applications or maintaining position
  • IP Ratings: 65 standard, 56, 66
  • Stall torque: .95 – 94 Nm
  • Nominal torque: .89 – 77.2 Nm
  • Nominal Speed: Up to 6,000 RPM
  • Find your right fit with Stober’s Configurator
stober logo

EZM Series

For direct drive of nut directly
STOBER’s Synchronous Servo Motors for Ballscrews eliminate extra components, offer better performance, and run cooler than other motors. Shaft tension is simplified and can be mounted on a variety of manufacturers’ spindles. The EZM series can handle threaded spindles of any length. It saves space by eliminating ball screw coupling and pillow blocks. Shaft tensioning is made simple. The flange meets DIN 69051-5 requirements.
  • 3rd Party Plug ‘n Play Connectivity
  • Holding brake – ideal for vertical applications or maintaining position
  • IP Ratings: 65 standard, 56, 66
  • Stall torque: 4.25 – 18.9 Nm
  • Nominal torque: 3.65 – 14.7 Nm
  • Nominal Speed: Up to 3,000 RPM
  • Find your right fit with Stober’s Configurator
stober logo

EZHD Series

For passing media through the center

The EZHD series is a revolutionary hollow bore motor. It’s ideal for passing media through the center of the motor. It is extremely compact and has a flange output for easy mounting.

  • 3rd Party Plug ‘n Play Connectivity
  • Holding brake – ideal for vertical applications or maintaining position
  • IP Ratings: 65 standard, 56, 66
  • Stall torque: .95 – 94 Nm
  • Nominal torque: .89 – 77.2 Nm
  • Nominal Speed: Up to 6,000 RPM
  • Find your right fit with Stober’s Configurator
stober logo

EZS Series

For driving the spindle
The EZS series drives the rotating threaded spindle. Pre-tensioning the shaft is simple as forces won’t be transmitted through the bearings.
  • 3rd Party Plug ‘n Play Connectivity
  • Holding brake – ideal for vertical applications or maintaining position
  • IP Ratings: 65 standard, 56, 66
  • Stall torque: 4.3 – 27.7 Nm
  • Nominal torque: 3.85 – 23.7 Nm
  • Nominal Speed: Up to 3,000 RPM
  • Find your right fit with Stober’s Configurator

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