求翻译：记得在选购步进电机的具体型号时，要求步进电机提供的输出转矩满足要求的同时尺寸也不能太大，必须小于一定值。是什么意思？

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Remember that choosing the specific type of stepper motor, stepper motor for providing the output torque meet the same requirements should not be so large as to size must be less than a certain value.

Remembered when selects and purchases step-by-steps the electrical machinery concrete model, requests the output torque which step-by-steps the electrical machinery to provide to satisfy the request at the same time size not to be able too to be big, must be smaller than certain value.

Remember when purchasing specific models of stepper motor requires stepping motor output torque meets the requirements of size or too big, must be less than a certain value.

I remember in choosing a specific type stepping motor, the stepper motor to provide the required output torque to meet the size requirements at the same time not too large, must be less than a certain value.