driving motor and electronic control develop from ac to ac. ac control can improve productivity, speed up, speed up the car and door, and drive the output torque at high speed. under the same working conditions, the energy consumption is small, and the single shift service time of battery pack can be prolonged. in addition, the ac motor has no brush and commutator, and does not need regular maintenance, which reduces the operation cost of the entire ac control system.
transition to electronic systems. traditional steering system of battery forklift truck adopts mechanical steering or hydraulic power steering. the disadvantages of mechanical steering are as follows. the disadvantage of hydraulic power steering is the waste of energy. the use of electronic steering not only controls the steering force, but also saves about 25% of the energy by hydraulic power steering.
the control system is developing towards integration. with the operator's requirement for comfort, integrated control has become a trend of development. the so-called integrated control is to use a control handle to complete all the control actions of the battery forklift: forklift forward/backward, gantry forward/backward, gantry up/down, cargo fork forward/backward, cargo fork left/right. this can reduce the labor intensity of operators and improve labor efficiency.
the brake system is developing towards electronics. in order to reduce braking impact and improve applicability, adjustable braking moment of transmission system is required, which promotes the development of adjustable moment electromagnetic brake. adjustable spring brake braking torque, torque controller, electronic control device and electromechanical integration of braking system can realize the function of adjustable braking torque. at the same time, it can also be used to monitor braking wear of torque controller, improve the reliability of the system and reduce the cost of operation and maintenance. in addition, the adjustable moment brake can be configured with can bus interface to realize remote diagnosis and control of the brake and realize the networked operation of the brake control.
apply the motor controller of hydraulic pump. the motor controller of the hydraulic pump can control the motor to realize stepless speed regulation of the door frame lifting/forward/backward, and can also set the motor speed to control the tilt/lateral movement speed of the fork. using the motor controller of hydraulic pump can save 25% energy, prolong the single-shift use time of battery group and reduce the heating of hydraulic system.
load potential energy recovery technology is used for door frame descent. load potential energy recovery technology can realize stepless speed regulation and save 5% energy. the principle of potential energy load recovery is: when the door frame, the hydraulic pump becomes a hydraulic motor, and the car becomes a generator load, the potential energy is converted into electric energy charging battery, so as to achieve the purpose of energy saving.