Understanding Nippon Pulse Terminology

Understanding Nippon Pulse Linear Shaft Motor Terminology

Nippon Pulse's Linear Shaft Motor (LSM) is a high quality servomotor solution that can fit into a wide variety of applications. To further understand this motor and its terminolgy, visit our LSM Terminology page.

Understanding Nippon Pulse Terminology and Specifications

Allowable (Permissible) Torque
The allowable torque represents the torque value limited by the mechanical strength of the gear.

Backlash
The play of gear output shaft when the motor shaft is fixed. When positioning in bi-direction, the positioning accuracy is affected

Gear Ratio
This is the ratio in rotation speed between the input speed from the motor and the speed of the ear output shaft. For example, the gear ratio 10:1 is that when the input speed from the motor is 10rpm, the gear output shaft is 1rpm.

Holding Torque
The holding torque is the maximum holding torque the stepping motor has when rated current is being supplied but the motor is not rotating (with consideration given to the permissible strength of the gear when applicable). If you are setting "automatic current down (Idle Current)" function at motor standstill, the holding torque should be less than setting rated current.

Maximum Starting Frequency (fs)
This is the maximum pulse speed at which the motor can start or stop instantly (without an acceleration or deceleration period) when  the functional load and inertial load of the stepper motor are 0. Driving the motor at greater than this pulse speed requires gradual acceleration or deceleration. This frequency drops when there is load inertia on the motor.

Pullout Torque
Pullout torque is the maximum torque that can be output at given speed. When selecting a motor, be sure the required torque falls within this curve.

Rated Current
The rated current is determined by motor temperature rise. It is the current value that can flow to the motor coils continuously at motor standstill. As a general rule, the current must be set to the rated current.

Rotor Inertia
This refers to the inertia of rotor inside the motor. This is necessary when the requires torque (acceleration torque) for the motor needs is calculated.

Step Angle
The step angle is the angular distance (in degrees) that the motor moves at the input of one pulse from the driver. It differs depending on the motor structure and excitation system.