The J-series motors have the same electrical specifications (speed torque curves) as the corresponding NeoMetric series motors. The J-series has more rotor inertia for increased load to rotor inertia.
This increase in motor inertia will affect the required torque for the applicaion. Because the motor inertia has increased, the torque required to accelerate the load and motor will increase.
Refer to the NeoMetric series brochure for electrical specifications (speed torque curves).