CONTROL SYSTEM FOR A THREE-PHASE AC MOTOR

• US 20190052215A1
• Filed: 07/12/2018
• Published: 02/14/2019
• Est. Priority Date: 08/11/2017
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Kristof, Thomas, Herke, Dirk
• Granted Patent: US 10,651,773 B2
• Time in Patent Office: Days
• CPC Class Codes: H02K 17/12 for multi-phase current
• CPC Class Codes: H02P 25/22 Multiple windings; Windings for more than three phases
• CPC Class Codes: H02P 27/08 with pulse width modulation
• CPC Class Codes: H02P 3/20 by reversal of phase sequence of connections to the motor

Abstract

A method for controlling a three-phase AC motor, wherein the three-phase AC motor has a rotatably mounted rotor and a stator including a first group of coils and a second group of coils. Each of the coils generates an oscillating magnetic field upon actuation using an alternating current. The phases of the alternating currents are selected such that the superposition of the magnetic fields of the first group of coils generates a magnetic rotating field that rotates with a direction of rotation and the superposition of the magnetic fields of the second group of coils generates a magnetic rotating field that rotates counter to the direction of rotation. A system composed of a three-phase AC motor and an inverter for carrying out the control method is also described.

Claims

1. In a three-phase AC motor having a rotatably mounted rotor and a stator including a first group of coils and a second group of coils, wherein each of the coils generates an oscillating magnetic field upon actuation using an alternating current, a method for controlling a three-phase AC motor comprising:

selecting the phases of the alternating currents such that the superposition of the magnetic fields of the first group of coils generates a magnetic rotating field that rotates with a direction of rotation and the superposition of the magnetic fields of the second group of coils generates a magnetic rotating field that rotates counter to the direction of rotation.

2. The method as claimed in claim 1, wherein the alternating currents for actuating the first group of coils have a constant first amplitude, the alternating currents for actuating the second group of coils have a constant second amplitude and a ratio of the first and second amplitude can be set to at least two different values.

3. A system comprising a three-phase AC motor and an inverter, wherein the three-phase AC motor has a rotatably mounted rotor and a stator comprising a first group of coils and a second group of coils, wherein each of the coils generates an oscillating magnetic field upon actuation using an alternating current generated by the inverter, wherein the phases of the alternating currents are configured such that the superposition of the magnetic fields of the first group of coils generates a magnetic rotating field that rotates with a direction of rotation and the superposition of the magnetic fields of the second group of coils generates a magnetic rotating field that rotates counter to the direction of rotation.

4. The system as claimed in claim 3, wherein the coils are configured to be actuated in a targeted manner.

5. The system as claimed in claim 3, wherein the inverter generates the alternating currents from an applied DC voltage by pulse-width modulation.

6. The system as claimed in claim 3, wherein the three-phase AC motor comprises an apparatus that is configured to lock rotary movement of the rotor.