Siemens Aktiengesellschaft

Friedhelm Pötter

Franz Schmeink

Andreas Kube

Andreas Klotzek

Ali Kemal Kücükyavuz

Joachim Ridder

A method and a device for controlling the drive of a vertical mill having a grinding plate rotatable about the vertical axis are disclosed. The grinding plate can be driven by an electric motor and a drivetrain with a gearbox. An actual rotational speed and a drivetrain torque with respect to the drivetrain are detected and are fed to a control device together with a specified target rotational speed. The control device generates an output signal for a target torque based on the actual rotational speed and the target rotational speed and based on the drivetrain torque such that the resulting target torque is reduced or increased in the same direction as a torque resulting from the milling process.

Drive control method and control device which operates according to the method

A mill drive system includes a gear unit which is arrangeable below a grinding plate and has at least one planetary and/or spur gear stage, having a vertical shaft position. The mill drive system includes an electric motor, integrated into a housing of the gear unit and having a rotor and a stator which have vertically extending axes. Upper and lower bearing covers each including bearing seats for rotor shaft bearing are mounted on opposite end faces on the rotor and stator and are connected via a stator carrier, which has cooling fins on the outer periphery. A collecting tray for coolant is formed between the lower bearing cover and a base part of the housing. The motor is supported via a flange which is formed on an inner face of the housing and extends radially inward and to which the lower and/or upper bearing covers are connected.

Mill drive system

A mill drive system with a transmission arranged beneath a milling table and with at least one planetary and/or spur gear stage as well as a vertical shaft position is provided. In addition, an electric motor is integrated in a housing of the transmission and is connected to a lubricant supply circuit of the transmission. A rotor and a stator of the electric motor have vertically extending axes. Cooling of the motor is performed by a lubricant circulating through the transmission. Furthermore, a lubricating-oil-proof sheath for rotor and/or stator windings of the electric motor for sealing with respect to the lubricant is provided. In addition, the mill drive system includes a converter with a regulation device for backlash-free speed regulation of the electric motor.

Growing community of inventors

Bergkamen, Germany

Friedhelm Pötter