# SMD3 Stepper Motor Drive > Single-Axis Bipolar Stepper Motor Drive Canonical product page: [https://arunmicro.com/products/smd3-stepper-motor-drive/](https://arunmicro.com/products/smd3-stepper-motor-drive/) Stepper motor drive optimised for use with AML UHV-compatible motors. Four operating modes including USB remote from a host PC and opto-isolated step and direction inputs. Continuous monitoring of motor temperature is provided with automatic shutdown to prevent motor damage. ## Product details - Product code: `smd3` - Category: [Stepper Motor Drives](https://arunmicro.com/products/category/stepper-motor-drives/) - Made in the UK - UK-based support ## Order codes | Order code | Description | Price | | --- | --- | --- | | smd3 | Stepper motor drive | £631.00 | | smd3joy | Two Button Joystick | £78.00 | | spsu48v | 48 Vdc, 60 W Power Supply | £89.00 | ## Overview The SMD3 is a single-axis bipolar stepper motor drive that is engineered to operate vacuum-compatible stepper motors with maximum performance while minimising temperature rise. It is optimised for use with AML UHV-compatible motors. Powerful software is supplied with the SMD3 that enables you to control and configure multiple SMD3 units simultaneously, in a single user-friendly graphical interface. - Single-channel UHV stepper motor drive optimised for vacuum use, ideally suited for use with our range of UHV stepper motors - Advanced low-power drive techniques for minimum motor temperature rise, minimum outgassing and maximum operating time - Holding torque can be controlled independently of dynamic torque under program control, to reduce power - Full-step and up to 256x micro-step resolution, with user-configurable transition from micro step to full-step mode (stops on full-step positions only; micro-stepping used for control of resonance and smoother step transition) - Continuous monitoring of motor temperature with automatic shutdown if motor temperature exceeds tolerable levels - Current adjustable from 0 A to 1 A RMS in approx. 30 mA steps - 2 x configurable limit inputs - Opto-coupled step, direction and enable interface - Control via USB - Comprehensive configuration and control software supplied, or interface to your own application. C# API is available ## Technical Specifications ###### General ###### Interface USB Type-C (appears as virtual COM port on PC) ###### Dimensions 180 mm x 105 mm x 26 mm ###### Weight 0.6 kg ###### Protection class IP 20 ###### Temperatures Operation 10°C to 60°C, Storage -10°C to 85°C ###### Power supply External 15 Vdc to 67 Vdc power supply required ###### Power comsumption 28 W maximum ###### Motor ###### Suitable types 2 phase bipolar stepper motor with 4 leads ###### Phase current Up to 1 A RMS, adjustable in 30 mA steps ###### Source voltage As supply voltage, 67 Vdc maximum ###### Resolution 8, 16, 32, 64, 128, 256 micro-stepping ###### Protection Short to ground and phase to phase ###### Operating Modes ###### USB Remote Control - Accepts commands from host PC or PLC - Powerful software supplied - Control and configure multiple axes at once ###### Step and direction - Opto-isolated step, direction enable - Configurable rising or rising/falling edge - Interpolation feature: full-step input can be interpolated up to 256x, reducing step input frequency while keeping the benefits of micro-stepping ###### Step and direction triggered - Start/stop using step signal, CW/CCW according to direction signal - Motor moves according to configured velocity profile ###### Joystick - Ideal for basic movement during commissioning - Press for one step, press and hold for slew - Latching mode: press to start/stop ###### Bake - Heats the motor by energising both phases and holding the motor stationary, regulating the current to achieve a setpoint temperature. - Used to drive off adsorbed moisture in the motor. ###### Home  - Home mode drives the motor to the positive or negative limit switch. ###### Limits ###### Quantity 2 ###### Compatible switch types Mechanical NO or NC (polarity selectable) ###### Protection Withstands continuous short to 12 V maximum ###### Miscellaneous Source current < 1 mA ###### Motor temperature measurement ###### Type Selectable PT100 RTD or K-Type thermocouple ###### Range -200°C to 240°C ###### Accurancy ±5% ###### Fault detection RTD: Open and short circuit Thermocouple: Open circuit only ###### SDE (step, direction enable) interface ###### Type Optocoupled, bi-directional LED ###### Levels 3.3 Vdc to 5 Vdc maximum ###### Maximum frequency 2 MHz at 50% duty ###### Joystick ###### Connection Front panel mounted 4P4C jack ###### Input type Active low, short to ground active function ###### Miscellaneous Open circuit voltage 3.3 V, source current < 3.5 mA ###### Software ###### Compatibility Windows 7 or later ###### Features Powerful bundled software allows you to easily configure and control multiple SMD3 units at once. View critical motor properties, such as temperature, absolute and relative position. Highly configurable limits setup; change polarity, swap or rename your limits. Command movements with the press of a button; easily toggle between velocity and absolute or relative positioning modes. Save your project to file; quickly reconfigure the system by loading different projects. Choose to save configuration to the SMD3 units and or file.   ######   ## Documentation and downloads - [Datasheet](https://arunmicro.com/documentation/Datasheet_SMD3.pdf) - [Operating Instructions](https://bookstack.vps-da8d40f3.arunmicro.com/books/smd3-user-manual) - [C# API](https://arunmicro.com/documentation/API_SMD3.zip) - [CAD Model](https://arunmicro.com/documentation/CAD_SMD3.zip) - [Software](https://arunmicro.com/documentation/AMLDeviceControlSetup.exe) ## Related products - [Ultra High Vacuum Stepper Motors](https://arunmicro.com/products/category/uhv-stepper-motors/): Suitable for use below  1 x 10-10 mBar. Including our D-Series Stepper Motors, Controllers and Planetary Gearheads.   - [SMD3 Connecting Cable](https://arunmicro.com/products/smd3-connecting-cable/): SMD3 stepper motor drive to MLF18F feedthrough cable.