Domestic refrigeration device with a coolant circuit, and method for operating a domestic refrigeration device with a coolant circuit

Patent metadata

Field	Value
Publication number	US-10386104-B2
Application number	US-201615551654-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Feb 23, 2015
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A domestic refrigeration device and a method for operating a domestic refrigeration device. The domestic refrigeration device has a heat-insulated body with a coolable inner container which delimits a coolable interior provided for storing food. A coolant circuit is provided for cooling the coolable interior and includes a compressor and a field-oriented electric drive. The field-oriented electric drive has a field-oriented controller, a converter, and a permanently excited synchronous motor which is connected downstream of the converter and which is part of the compressor or is provided for driving the compressor.

First claim

The invention claimed is:

1. A method for operating a domestic refrigeration appliance,
the appliance having:
a thermally insulated body with a coolable inner container delimiting a coolable interior chamber for storing food, a refrigerant circuit for cooling the coolable interior chamber with a compressor and a controlled electric drive;
wherein the controlled electric drive has a field-oriented controller, a converter and a permanently excited three-phase synchronous motor, which is connected downstream of the converter and which is part of the compressor or configured to drive the compressor;
wherein the field-oriented controller has a first current control circuit configured to control a transverse current generating a main torque of the permanently excited three-phase synchronous motor, a second current control circuit configured to control a longitudinal current for the permanently excited three-phase synchronous motor and a speed control circuit super ordinate to the first and second current control circuits, the speed control circuit generating a transverse current target value for the first current control circuit as a function of a predetermined target speed for the permanently excited three-phase synchronous motor and an actual speed of the permanently excited three-phase synchronous motor, and wherein output signals of the first and second current control circuits are provided at least indirectly to activate the converter;
the method comprising the following method steps:
for starting up the permanently excited three-phase synchronous motor from standstill, implementing a target speed for the field-oriented controller as a function of a cooling requirement for the coolable interior chamber; and
approaching a longitudinal current target value provided for the second current control circuit or its magnitude starting from “zero” to a predetermined value within a first time period according to a predetermined profile, to cause the permanently excited three-phase synchronous motor to generate an additional torque to the main torque due to a resulting longitudinal current, so that an overall torque of the permanently excited three-phase synchronous motor is greater than the main torque.

2. The method according to claim 1 , wherein the first current control circuit has a first current controller and the second current control circuit has a second current controller and an input signal for the first current controller is a deviation of the transverse current actual value from the transverse current target value and an input signal for the second current controller is a deviation of the longitudinal current actual value from the longitudinal current target value.

3. The method according to claim 1 , which comprises adjusting the longitudinal current target value or a magnitude thereof in a ramp shape during the first time period and which comprises storing an adjustment profile in a look-up table or determining the adjustment profile by way of a mathematical formula.

4. The method according to claim 1 , which comprises adjusting the longitudinal current target value or a magnitude thereof in accordance with an adjustment profile stored in a look-up table or determined by way of a mathematical formula.

5. The method according to claim 4 , which comprises reducing the longitudinal current target value or the magnitude thereof from a predetermined value to “zero” within a predetermined third time period according to a predetermined profile.

6. The method according to claim 1 , which further comprises:
reducing the longitudinal current target value or a magnitude thereof to “zero” as soon as the permanently excited three-phase synchronous motor reaches a stable working point or after a predetermined second time period; and
subsequently operating the field-oriented controller with a longitudinal current target value equal to “zero”.

7. A domestic refrigeration appliance, comprising:
a thermally insulated body with a coolable inner container delimiting a coolable interior chamber for storing food;
a refrigerant circuit configured to cool said coolable interior chamber, said refrigerant circuit including a compressor and a field-oriented electric drive, which has a field-oriented controller, a converter and a permanently excited three-phase synchronous motor, which is connected downstream of said converter and which forms part of said compressor or is configured to drive said compressor;
said field-oriented controller having a first current control circuit provided to control a transverse current generating a main torque of said permanently excited three-phase synchronous motor, a second current control circuit provided to control a longitudinal current for said permanently excited three-phase synchronous motor and a speed control circuit super ordinate of said first and second current control circuits, said speed control circuit generating a transverse current target value for said first current control circuit as a function of a predetermined target speed for said permanently excited three-phase synchronous motor and an actual speed of said permanently excited three-phase synchronous motor;
said first and second current control circuits carrying output signals for directly or indirectly activating said converter, and wherein:
for starting up said permanently excited three-phase synchronous motor from standstill, a target speed for said field-oriented controller is determined as a function of a cooling requirement for said coolable interior chamber, and a longitudinal current target value for said second current control circuit or a magnitude thereof is adjusted starting from “zero” to a predetermined value within a first time period according to a predetermined profile, to cause said permanently excited three-phase synchronous motor to generate an additional torque to the main torque due to the resulting longitudinal current, so that an overall torque of said permanently excited three-phase synchronous motor is greater than the main torque.

8. The domestic refrigeration appliance according to claim 7 , wherein said first current control circuit has a first current controller and said second current control circuit has a second current controller and an input signal for said first current controller is a deviation of the transverse current actual value from the transverse current target value and an input signal for said second current controller is a deviation of the longitudinal current actual value from the longitudinal current target value.

9. The domestic refrigeration appliance according to claim 7 , wherein an adjustment of the longitudinal current target value or the magnitude thereof is ramp-like during the first time period and/or wherein a profile of the adjustments is stored in a look-up table or is calculated by way of a mathematical formula.

10. The domestic refrigeration appliance according to claim 7 , wherein the longitudinal current target value or the magnitude thereof is decreased to “zero” as soon as said permanently excited three-phase synchronous motor reaches a stable working point or after a predetermined second time period, and wherein the field-oriented controller is subsequently operated with a longitudinal current target value equal to “zero”.

11. The domestic refrigeration appliance according to claim 10 , wherein the longitudinal current target value or the magnitude thereof is reduced from its predetermined value to “zero” within a predetermined third time period according to a predetermined profile.

Assignees

• Bsh Hausgeraete Gmbh

Inventors

• Paulduro Achim
• Beckmann Tommy
• Walter Axel
• Klein Moritz

Classifications

• F25B2600/024

  by controlling the electric parameters, e.g. current or voltage · CPC title

• H02P1/46

  for starting an individual synchronous motor {(H02P27/04 takes precedence)} · CPC title

• H02P21/00

  Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation · CPC title

• F25B31/026

  with compressor of rotary type · CPC title

• H02P27/04 Primary

  using variable-frequency supply voltage, e.g. inverter or converter supply voltage · CPC title