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V012024 • © 2024 Portescap. Specifications subject to change without notice.Glossary (for Brushless Slotless DC Motors)Electrical DataNominal voltage This voltage is used when measuring no-load speed, no-load current and other parameters. It does not represent a recommended voltage or a limitation of the motor.Optimization directionBrushless motors equipped with Hall sensors can be tuned so that the sensor positions compensate for the electrical and electronic time response of the commutation sequence. This is especially important for reducing motor losses in high-speed applications.All the standard motors shown in this catalog are either symmetrical or optimized in the counterclockwise (CCW) direction as seen from the output shaft side of the motor. For optimized motors, optimization speed is mentioned in the specification document. Optimization speed and direction can be customized by request.No-load speed This is the motor speed as measured without any attachment or friction on the output shaft, with the driver being supplied by the nominal voltage.Typical no-load current This is the average current measured before the driver power stage, without any attachment or friction on the output shaft and with the driver being supplied by the nominal voltage. This parameter can vary significantly depending on the driver used and the motor temperature. All data are measured using the Hall-sensored version of the commutation, when available, after 30 seconds of running the motor at room temperature.Max continuous mechanical power (@ 25°C)Within maximum continuous operation specifications (see power curve graph), and with proper selection of speed and torque, this is the highest mechanical power output that can typically be achieved without exceeding the thermal limitation of the motor windings. In some cases, this maximum power can also be limited by the maximum recommended motor speed for the bearing assembly. Maximum continuous power is calculated with the motor in the air at 25°C, with no heat sink or forced air cooling. With improved cooling, it may be possible to exceed this value in short-term operation.Max continuous currentWithin maximum continuous operation specifications (see power curve graph), this is the current drawn at the highest output torque the motor can continuously achieve without exceeding the thermal limitations of the windings. Maximum continuous current is usually reached at a very low speed where iron and friction losses are minimal.This value is calculated with the motor in the air at 25°C, with no heat sink or forced air cooling. With improved cooling, it may be possible to exceed this value in short-term operation. This value does not apply to the very short peak current at startup, which can typically reach several tens of amps.Max continuous torqueThis is the torque corresponding to the maximum continuous current, usually reached at very low speed.Stall torque, when the motor needs to start from a blocked position, may be lower than this figure due to motor torque ripple.12