Wednesday, November 27, 2019

Design Tips for Using Step Motors

A Step Motor is defined as a device whose normal shaft motion consists of discrete angular movements of essentially uniform magnitude when driven from a sequentially switched DC power supply. A step motor is a digital input-output device. It is particularly well suited to the type of application where control signals appear as digital pulses rather than analog voltages.

Parallel connect the lead wires for best torque over the widest speed range
NEMA Frame Stepper MotorsIf not enough current is available from the drive, series connect the lead wires for full torque at low speeds
Keep motor case temperature below 100 °C. This can be achieved by lowering the motor current or limiting the duty cycle
Allow sufficient time to accelerate load
Use a microstepping drive for smoothest motor performance over a wide speed range
For open loop operation, size the motor with a 30-50% torque margin at speed. Including an encoder in the system and using  a Stall Prevention feature may allow operation all the way down to a 0% torque margin
Do not disassemble motors.   A significant reduction in motor performance will result
Do not machine shafts without consulting Electromate® first
Do not disconnect motor from drive while power is applied. Remove power from the drive before disconnecting the motor
Do not use holding torque/detent torque of motor as fail-safe brake
Use an Electromate® recommended stepper drive with your step motor to ensure optimal performance.

Electromate® sells a family of 2-phase hybrid type step motors with a 1.8° step angle in NEMA frame sizes from NEMA 6, NEMA 8,nema 11  to NEMA 42 motor. Stepper motors from Electromate® are available in 4, 6 or 8 lead configurations for bipolar or unipolar operation. All motors can be wired in series or parallel, depending on the requirement. Motors are available with optional rear shaft extensions, encoders, brakes, cables, gearboxes and IP65 sealing.

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