Brake device

Patent metadata

Field	Value
Publication number	US-11509246-B2
Application number	US-201916965827-A
Country	US
Kind code	B2
Filing date	Jan 7, 2019
Priority date	Feb 6, 2018
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

The disclosure relates to a brake device for an electric motor, which has at least one armature winding and at least one field winding, comprising at least one open-loop and/or closed-loop control unit at least for open-loop control and/or closed-loop control of at least one electric current through the armature winding and/or through the field winding. According to the disclosure, in the event of short-circuit braking of the electric motor, the open-loop and/or control-loop unit is intended to reduce, at least temporarily, an electric armature current flowing through the armature winding.

First claim

The invention claimed is:

1. A brake device for an electric motor, the electric motor having at least one armature winding and at least one field winding, the brake device comprising:
at least one controller configured to control at least one electrical current flowing through at least one of (i) the at least one armature winding and (ii) at least one the field winding, the controller being configured to at least temporarily adjust an electrical current strength of an electrical armature current flowing through the at least one armature winding to be less than an electrical current strength of an electrical field current flowing through the at least one field winding during short-circuit braking of the electric motor.

2. The brake device as claimed in claim 1 further comprising:
at least one detection device configured to detect the electrical field current.

3. The brake device as claimed in claim 2 , wherein:
the at least one detection device is configured to provide at least one piece of information about the electrical field current to the controller; and
the controller is configured to control the electrical armature current based on the at least one piece of information.

4. The brake device as claimed in claim 2 , wherein the controller and the at least one detection device are at least partially formed as one piece.

5. A method for operating a brake device for an electric motor having at least one armature winding and at least one field winding, the method comprising:
at least temporarily adjusting, with at least one controller of the brake device, an electrical current strength of an electrical armature current flowing through the at least one armature winding to be less than an electrical current strength of an electrical field current flowing through the at least one field winding during short-circuit braking of the electric motor.

6. The method as claimed in claim 5 further comprising:
detecting the electrical field current.

7. The method as claimed in claim 6 further comprising:
providing at least one piece of information about an electrical field current; and
controlling the electrical armature current based on the at least one piece of information.

8. A machine tool comprising:
at least one electric motor having at least one armature winding and at least one field winding; and
at least one brake device having at least one controller configured to control at least one electrical current flowing through at least one of (i) the at least one armature winding and (ii) at least one the field winding, the controller being configured to at least temporarily adjust an electrical current strength of an electrical armature current flowing through the at least one armature winding to be less than an electrical current strength of an electrical field current flowing through the at least one field winding during short-circuit braking of the electric motor.

Assignees

• Bosch Gmbh Robert

Inventors

• Wiker Juergen
• Dengler Klaus
• Schneider Matthias

Classifications

• B23D51/166

  Devices for arresting movement of the saw blades (B23D51/20 takes precedence) · CPC title

• H02P25/14

  Universal motors (H02P25/12 takes precedence) · CPC title

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• H02K7/106

  with dynamo-electric brakes · CPC title

• H02P3/22 Primary

  by short-circuit or resistive braking · CPC title