Study on energy-saving electric forklift has tremendous market values and realistic social benefits.

With the rapid development of logistics, electric forklifts become more and more widespread while the rate of accident becomes higher in recent years.

Introducted the development of AC electric forklifts drive system, compared common programme of vector control systems of AC electric forklift motor, Outlined the development trend of electric forklifts.

Fuzzy comprehensive evaluation of reliability of multidirectional electric forklift;

In this thesis, the decision theory of the scheme, the reliability theory of the system and the fuzzy theory of project are adopted to study the method of scheme decision in the course of the scheme design of the multidirectional electric forklift.

By analyzing forces on a single tyre and adhesive performance on whole forklift,a relation of adhesive coefficients to sliding direction is set up,rub coefficients and adhesive limit are analyzed,a relation of multi-directional electrical forklift static stability to its adhesive performance is set up,a method judging un-stability of a multi-directional electrical forkl.

The paper introduces the theoretical analysis of the static stability of multi-directional electrical forklift by means of the multi-body-system model built up, offers conditions needed to distinguish unstableness in static and features the calculation of the static stability of the forklift.