Synchronous machine and method for regulating the rotational speed of the synchronous machine without sensors

Patent metadata

Field	Value
Publication number	US-11228266-B2
Application number	US-201916672721-A
Country	US
Kind code	B2
Filing date	Nov 4, 2019
Priority date	May 16, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

A permanent magnet synchronous machine (1) having a rotor (R) and a stator (S). Connection terminals (2) apply a feed alternating voltage with a feed frequency (f0). The permanent magnet synchronous machine (1) has a motor controller (10). The controller (10) has an assembly (11) to detect the terminal voltage on the connection terminals (2) and the current frequency (fa). Also, the controller has an analysis device (12). The analysis device (12) ascertains whether the current frequency (fa) contains a frequency component (fr) with a frequency that deviates from the feed frequency (f0).

First claim

What is claimed is:

1. A permanent magnet synchronous machine comprising:
a rotor (R) and a stator (S) formed with connection terminals for applying a feed alternating voltage with a feed frequency (f 0 );
a motor controller including:
an assembly for detecting the terminal current on the connection terminals and a current frequency (f a ) of the terminal current; and
an analysis device, the analysis device configured to ascertain whether the current frequency (f a ) contains a frequency component (f r ) with a frequency that deviates from the feed frequency (f 0 ), and whether the frequency component (f r ) is a decreasing frequency; and

the motor controller is configured to, as a function of the determined frequency component (f r ), change the amplitude of a terminal voltage when the frequency component (f r ) is a decreasing frequency.

2. The permanent magnet synchronous machine according to claim 1 , further comprising a display device for displaying the frequency component (f r ) that deviates from the feed frequency (f 0 ).

3. The permanent magnet synchronous machine according to claim 1 , wherein the motor controller is further configured to change a frequency of the terminal voltage to a frequency of the rotor (R).

4. The permanent magnet synchronous machine according to claim 1 , further comprising a converter configured to supply the feed alternating voltage, and the motor controller is configured to change a converter frequency of the converter and to a frequency of the rotor (R).

5. The permanent magnet synchronous machine according to claim 1 , wherein the synchronous machine is a single-phase synchronous machine.

6. A method for operating a permanent magnet synchronous machine according to claim 1 including the steps of:
a. applying the feed alternating voltage with the feed frequency (f 0 ) to the terminals of the synchronous machine;
b. monitoring the terminal current on the connection terminals and the current frequency (f a ); and
c. determining whether the current frequency (f a ) of the terminal current contains the frequency component (f r ) with a frequency that deviates from the feed frequency (f 0 ) and whether the frequency component (f r ) is decreasing.

7. The method according to claim 6 further comprising adapting at least one of the frequency and the amplitude of the terminal voltage is carried out as soon as, in c), a detection of the frequency component (f r ) with a frequency that deviates from the feed frequency (f 0 ) is determined and is decreasing.

8. The method according to claim 7 , wherein the adaptation of the at least one of the frequency and the amplitude of the terminal voltage takes place so that the rotor continues to rotate at a constant rotational speed.

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Wystup Ralph

Classifications

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02P6/17

  and for generating speed information · CPC title

• H02P6/26 Primary

  Arrangements for controlling single phase motors · CPC title

• H02P6/007

  wherein the position is detected using the ripple of the current caused by the commutation · CPC title

• H02P6/182

  using back-emf in windings · CPC title