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国内塔式起重机的起升机构普遍采用的电气传动方式有:绕线式电机转子串组与涡流调速;绕线式电机转子串组与电磁换档调速;多速电机调速。八十年代初法国波坦公司推出了新颖的LMD电气传动系统,这种机构一反往常,以其独特的传动工作方式,集机、电、液于一体,实现吊重下连续宽范围调速。具有效率高、起重能力大、性能好等优点,在国外的高大型塔机上广泛采用。例如法国波坦公司生产的H3/36B-LMD塔机起升机构可实现0～260米/分的无级调速,起重能力达12吨。
Domestic tower crane lifting mechanism commonly used in electric transmission are: winding motor rotor series and eddy current speed control; winding motor rotor series and electromagnetic gear shift speed; multi-speed motor speed. The early eighties France launched a new company Potain LMD electric transmission system, this organization an anti-usual, with its unique way of transmission work, set machine, electricity, liquid in one to achieve continuous lifting under a wide range of speed . With high efficiency, lifting capacity, good performance, etc., widely used in foreign tall tower crane. For example, the French tower company H3 / 36B-LMD tower crane lifting mechanism can achieve 0 ~ 260 m / min stepless speed regulation, lifting capacity of 12 tons.