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AC Frequency Conversion Motor
The induction motor AC drive system is the
new technology developed in 1990s.The
working principle is that, the three phase
AC is sent to the stator winding, generating
rotor winding and current. The rotor will
then rotate along with the rotation direction
of magnetic field.
The vector controlled frequency
controlling technology is applied to the
motor controller.
The predominant feature of AC motor
is no need of carbon brush, and no limitation
to the maximum current. So that the motor
will get larger power, bigger braking torque
force, and run with faster speed.
The heat of AC motor generates mainly at
the stator coil of motor shell, easy for
cooling and heat radiating.
Compared to the DC motor, the AC motor is
equipped with fewer components and no need
of easy wearing parts. So it hardly needs
maintenance, and is more efficient and reliable.
Thanks to the development on frequency conversion
technology of AC induction motor, and improvement
on the powerful semiconductor and microprocessor,
the induction motor AC drive system is with
higher efficiency, smaller size, lighter
weight, simpler structure, easier cooling
system and longer working time.
The speed regulation range of AC
drive system is wide, so that low speed
and constant torque operation or high speed
and constant power operation is realized,
which greatly meet the practical demands
of electric vehicle.
Regenerative Braking
Regenerative braking is a type of non-contact
braking with simpler structure. No matter
whether the driver brakes by braking pedal
or by direction switching, the motor will
always be at generating state, and transform
the electromagnetic torque into braking
torque. As a result, the wear of braking
sheet is reduced to the minimum and the
mechanical wear is also greatly reduced,
so that the maintaining fee is reduced and
the operation cost is lowered down.
The AC motor has higher efficiency in operating
and braking. Regenerative energy will be
generated when braking or switching, the
harder, the more. The energy storage device
of AC drive system will be turned on automatically
during braking or switching, and send the
energy back to battery, prolonging the battery
working time. For some DC drive truck lift,
the regenerative braking works only for
hard braking, which means part of the regenerative
heat has been transformed into heat. However,
for AC motor, regenerative energy will be
generated and persisted at any case, with
higher regenerating efficiency.
Regenerative braking:
1. Energy recovery in deceleration.
2. Energy recovery in grip brake or foot
brake.
3. Energy recovery in grade descending.
4. Energy recovery in parking by switching
operation bar.
Special Features
AC motor drive system
New type of AC drive motor and hydraulic
motor, no need to change the electric brush
or contactor, which will greatly
reduce the maintaining cost and give you
more economy.
Neutral gear locking
Start the forklift only in case of neutral
gear, to ensure more convenient and safer
operation.
Emergent stop button
Cut off all power sources in emergency,
ensuring safer and more convenient operation.
Good waterproof performance
Waterproof and dustproof design for installation
parts, and totally enclosed radiating fan
duct design for central control unit.
Parking break locked
Press the locking button on the parking
break handle for unlocking.
Steering wheel
Thanks to the rotary encoder controlled,
and integrated steering system, it is possible
to realize the biggest turning direction
with the smallest operation force.
Advance AC control system
Equipped with energy regenerating device,
which will automatically charge the battery
and prolong the working period of forklift
when loosening the accelerate panel.
Reliable accelerator
The inner safety switch ensures safer operation.
The service life is more than 10
million times.
Fork buffer system
The fork descending speed will fall down
3.5 seconds before it reaching the ground,
reducing both collision and noise. |
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