Drive system with combined actuation of brake and encoder

Patent metadata

Field	Value
Publication number	US-9484846-B2
Application number	US-201414489011-A
Country	US
Kind code	B2
Filing date	Sep 17, 2014
Priority date	Sep 18, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A drive system includes a line assembly configured to connect a power converter to an electric motor which has a brake and an encoder. The line assembly has at least two power lines and only two brake lines exclusively to provide a data transfer between the power converter and the electric motor and to transfer energy to the encoder. The power converter applies a first supply voltage of a first polarity and a second supply voltage of a second polarity opposite to the first polarity to the brake lines for supplying the brake and the encoder. The electric motor supplies the encoder with the respective supply voltage independently of its polarity and the brake with the respective supply voltage depending on its polarity.

First claim

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims and includes equivalents of the elements recited therein:

1. A drive system, comprising:
a power converter;
an electric motor including a brake and an encoder; and
a line assembly configured to connect the power converter to the electric motor, said line assembly having at least two power lines and two brake lines exclusively to provide a data transfer between the power converter and the electric motor and to transfer energy to the encoder,
said power converter being configured to apply a first supply voltage of a first polarity and a second supply voltage of a second polarity opposite to the first polarity to the brake lines for supplying the brake and the encoder,
said electric motor being configured to supply the encoder with a respective one of the first and second supply voltages independently of their polarity and to supply the brake with a respective one of the first and second supply voltages depending on their polarity.

2. The drive system of claim 1 integrated in a production machine.

3. The drive system of claim 1 , wherein the power converter and the electric motor are configured to transfer the data over the brake lines.

4. The drive system of claim 3 , wherein the data transfer takes place over the brake lines at a frequency above 10 kHz.

5. The drive system of claim 4 , wherein the frequency is above 1 MHz.

6. The drive system of claim 1 , wherein the power converter has a switchable bridge configured to generate the first and second supply voltages from a DC voltage.

7. The drive system of claim 1 , further comprising a diode configured to connect the brake, arranged in or on the electric motor, to the brake lines.

8. The drive system of claim 1 , further comprising a bridge rectifier configured to connect the encoder to the brake lines.

9. The drive system of claim 1 , wherein the brake lines are shielded separately with respect to the power lines.

10. The drive system of claim 1 , further comprising a total shielding configured to encase all the power and brake lines of the line assembly.

11. The drive system of claim 1 , wherein the electric motor is a three-phase motor and the line assembly has four of said power lines.

12. The drive system of claim 1 , further comprising a driver module coupled to the brake lines for data transfer in both the power converter and the electric motor.

Assignees

• Siemens Ag

Inventors

• Kuhn Andreas

Classifications

• H02P29/00

  Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors (arrangements for starting electric motors H02P1/00; arrangements for stopping or slowing electric motors H02P3/00; control of motors that can be connected to two or more different electric power supplies H02P4/00; regulating or controlling the speed or torque of two or more electric motors H02P5/00; vector control H02P21/00) · CPC title

• H02P3/04 Primary

  Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake · CPC title

• H05K7/1471

  Modules for controlling actuators · CPC title