Method for Operating a Universal Motor

• US 20160254773A1
• Filed: 10/07/2014
• Published: 09/01/2016
• Est. Priority Date: 10/17/2013
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: WISZNIEWSKI, Jacek, DENGLER, Klaus
• Granted Patent: US 10,461,680 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02P 1/16 for starting dynamo-electric motors or dynamo-electric converters
• CPC Class Codes: H02P 1/18 for starting an individual dc motor
• CPC Class Codes: H02P 25/14 Universal motors H02P25/12 takes precedence
• CPC Class Codes: H02P 3/06 for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter

Abstract

A method for operating a universal motor, comprising the following steps:—establishing a synthetic variable from at least two physical operating parameters of the universal motor; and—operating the universal motor using operating parameters of this type so that the synthetic variable remains at a substantially constant level or at least does not exceed a defined permissible upper limit.

Claims

1. A method for operating a universal motor, the method comprising:

ascertaining a synthetic variable made up of at least two physical operating parameters of the universal motor; and

operating the universal motor using parameters such that the synthetic variable at least one of (i) remains at a constant level and (ii) does not exceed a defined upper limit.

2. The method as claimed in claim 1, further comprising:

forming the synthetic variable using a mathematical relationship made up physical operating parameters of the universal motor including at least two of (i) rotational speed, (ii) amperage, (iii) armature voltage, and (iv) armature field voltage.

3. The method as claimed in claim 1, further comprising:

forming the synthetic variable using at least one of (i) peak values and (ii) effective values of the at least two physical operating parameters of the universal motor.

4. The method as claimed in claim 1, further comprising:

storing an optimized parameter set for the universal motor a control device of the universal motor, the optimized parameter set being stored as a function of the synthetic variable.

5. The method as claimed in claim 1, further comprising:

detecting the at least two operating parameters used for forming the synthetic variable in real time;

forming the synthetic variable in real time; and

changing an influencing variable for the universal motor in real time as a function of the synthetic variable.

6. The method as claimed in claim 1, further comprising:

carrying out a self-learning process for the synthetic variable.

7. The method as claimed in claim 1, wherein the method is carried out during at least one of (i) a start-up operation of the universal motor and (ii) a braking operation of the universal motor.

8. The method as claimed in claim 1, further comprising:

holding the synthetic variable below a predetermined value.

9. A universal motor comprising:

a commutation device, wherein a synthetic variable made up of at least two physical operating parameters of the universal motor is ascertained, the universal motor being configured to operate using parameters such that the synthetic variable at least one of (i) remains at a constant level and (ii) does not exceed a defined upper limit, during operation of the universal motor.

10. The universal motor as claimed in claim 9, wherein the synthetic variable remains at a constant level at least one of (i) a start-up operation of the universal motor, (ii) a braking operation of the universal motor, and (iii) does not exceed a defined upper limit.

11. The universal motor as claimed in claim 9, wherein the universal motor is in an electric tool.

12. A non-transitory computer program product having program code configured to, when run on an electronic control device operably connected to an universal motor:

ascertain a synthetic variable made up of at least two physical operating parameters of the universal motor; and

operate the universal motor using parameters such that the synthetic variable at least one of (i) remains at a constant level and (ii) does not exceed a defined upper limit.