Thomson currently has two account systems - one for the website and CAD model downloads, and one for e-commerce. We understand that two logins is an inconvenience and are working to consolidate our systems into one login process. Until we’re able to consolidate the two logins, please follow these guidelines:
Stack refers to the motors rotor length. A double stack motor will have a larger length than a single stack motor of the same size and design. The double stack motor will provide more torque than a similar single stack motor.
Available current or amperage rating
At a constant voltage, the higher amperage motor will produce more torque. When driving a stepper motor, an important consideration is the current rating of the motor. If not enough current is supplied, the motor output torque will not be optimized, and the system will be under-performing. Too much current and the motor may overheat and damage to the motor windings can occur.