NHC 6AT : Cost-cut factors
▶ NHC 6AT makes smaller motor
to provide wider range of rpm and torque
without using field weakening control.
• With the same top speed with single speed motor, motor of half output creates twice stronger torque at the first gear.
• Motor always runs at the rated output range with rated rpm (rated voltage) and rated torque (rated ampere),
which is the one-third power of max power of single speed motor to use field weakening control.
Max permitted torque (max permitted ampere) is 1.5 times of the rated torque
(output is produced around 1.5 times as well), which is temporally allowed before overheat.
▶ Six-speed gear shift with squeezed gear-by-gear change ratio enables the motor to run in the rated rpm range with high efficiency
▶ Energy consumption is reduced for motor operates from low gear to high gear
Ampere (A) is proportionally
consumed to load.
▶ Max permitted torque (max permitted ampere) is limited to use in power mode “ON”
It is seldom used.
• It is programmed to be “OFF” after it passes for about 5 minutes, or heat is elevated to overheat point.
• As shown in above graph, efficiency drastically drops after passing over rated output with overheat, which results
destruction of motor and controller
Fluid cooling system indispensable
※ Extreme overheat at max output causes controller and motor too severe damage. Motor should run within 10 to 20
seconds at max output.