Drive system using a servomotor with a memory

Details Drive system using a servomotor with a memory Drive system using a servomotor with a memory

1998-08-07

2001-04-03

Sircus, Brian (Department: 2839)

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

C318S568190, C318S574000, C318S625000

Reexamination Certificate

active

06211639

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a drive device for use with a servomotor and a control module.
BACKGROUND INFORMATION
European Patent No. 446 733 B1 describes a known drive device used in conjunction with a servomotor, an upstream current control device, and a speed and position control device in cascade. The current control device includes a memory, where data for identifying the current amplifier used, as well as motor characteristics, are stored. The data in the current control device can be communicated to a higher-level control device via a communication device. The concept is convenient when current control devices and servomotor are permanently associated. The concept is less suitable when current control devices are often associated with other motors. In that case, the motor characteristics stored in the memory of the current control device must be adjusted every time.
German Patent No. 37 44 733 C2 describes a current control device with electric tools of different kinds that can be connected to the control device. Tool-specific codes are stored in a digital memory. When the connector is inserted in the socket, the data forming the codes is entered in the electronic control device serially via the data transmission lines and the I/O circuit. Limit values for parameters such as rotation speed, temperature, torque, electric current, voltage, and the like can be defined using these codes.
Furthermore, built-in encoders for servomotors (identified as Heidenhain, FRN/ECN/EQN 1300 Series) are known, which allow motor characteristics to be entered and, upon request, output via a synchronous serial data interface. Motors with such encoders can be conveniently connected to any kind of control. However, if the encoder has to be replaced, the replacement encoder must be reprogrammed, for which one must know both encoder programming and the motor characteristics. Neither is guaranteed in practice. Therefore, the storage options for motor characteristics are limited to certain intelligent incremental encoders. Encoders of simpler design, e.g., magnetic systems with ring-gear encoders, basically do not provide such an option, although it is possible to retrofit them to do so, but this would entail additional costs.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a drive device that can be combined with any type of control device and is independent of the encoder type selected.
In the drive device of the present invention, motor characteristics are stored permanently in a data memory located in the motor housing. Consequently, the motor can be easily integrated into any control configuration even by users unfamiliar with the motor technology. In particular, the motor current supply with the respective current regulation can be automatically adjusted to a motor after reading the motor characteristics. It is advantageous that a microprocessor or an application-specific integrated circuit (ASIC) to control access to the motor data be associated with the memory where the motor characteristics are stored. The motor-specific data stored in the non-volatile memory is sent to the control module via a data output. The signal of a sensor associated with the motor is sent to the control module via the same data output and the respective data line. The terminal already present for this application is also used for transmitting the motor-specific data according to the present invention. For this purpose, locating the non-volatile memory in the servomotor housing offers advantages due to the simple data link.


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