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EP-4287497-B1 - METHOD FOR THE SILENT OPERATION OF AN ELECTRIC MOTOR DEVICE, AN ELECTRIC MOTOR DEVICE AND A HEAT ENGINE

EP4287497B1EP 4287497 B1EP4287497 B1EP 4287497B1EP-4287497-B1

Inventors

  • GAENZLE, DAVID
  • MANDERLA, Maximilian
  • Huebel, Johannes
  • Thielecke, Anja
  • HERBST, JUERGEN

Dates

Publication Date
20260513
Application Date
20230519

Claims (8)

  1. Method for low-noise operation of an electric motor device, in particular of a compressor, wherein, in at least one method step, an actuating signal (14a; 14b; 14c; 14d; 14e; 14f) dependent on a control variable is sent to an electric motor (16a; 16b; 16c; 16d; 16e; 16f) of the electric motor device, characterized in that the actuating signal (14a; 14b; 14c; 14d; 14e; 14f) is created depending on harmonic control (18a; 18b; 18c; 18d; 18e; 18f) of the control variable and depending on stabilization control (20a; 20b; 20c; 20d; 20e; 20f) of the control variable, wherein the harmonic control (18a; 18b; 18c; 18d; 18e; 18f) is provided for counteracting at least one oscillation of the electric motor (16a; 16b; 16c; 16d; 16e; 16f) at a defined frequency, in particular a harmonic of a frequency, which corresponds to the rotation speed of the operating point, or for amplifying this oscillation, wherein the stabilization control (20a; 20b; 20c; 20d; 20e; 20f) is provided for reducing fluctuations in the control variable that are caused by a changing load, and wherein the stabilization control (20a; 20b; 20c; 20d; 20e; 20f) comprises operating point-dependent feed-forward control (22a; 22b; 22c; 22d; 20e; 20f), depending on which the actuating signal (14a; 14b; 14c; 14d; 20e; 20f) is created.
  2. Method according to Claim 1, characterized in that a contribution of the stabilization control (20e; 20f) to the actuating signal (14e; 14f) is dependent on an actual value of the actuating signal (14e; 14f).
  3. Method according to either of the preceding claims, characterized in that the harmonic control (18a; 18b; 18d; 18e; 18f) and the stabilization control (20a; 20b; 20d; 20e; 20f) are carried out upstream of basic control (24a; 24b; 24d; 24e; 24f) for setting an operating point of the control variable.
  4. Method according to any of the preceding claims, characterized in that , in at least one method step, at least part of a contribution of the stabilization control (20a; 20b; 20c; 20d) to the actuating signal (14a; 14b; 14c; 14d) is determined by means of the harmonic control (18a; 18b; 18c; 18d).
  5. Method according to any of the preceding claims, characterized in that the harmonic control (18a; 18b; 18c; 18d; 18e; 18f), in at least one method step, raises an oscillation amplitude of at least one oscillation frequency of the electric motor device that is dependent on the control variable.
  6. Method according to any of the preceding claims, characterized in that an oscillation amplitude and/or oscillation frequency of the electric motor device is detected in at least one method step.
  7. Electric motor device, in particular compressor, having at least one electric motor (16a; 16b; 16c; 16d; 16e; 16f) and having at least one control unit (28a; 28b; 28c; 28d; 28e; 28f) configured to carry out a method according to any of the preceding claims.
  8. Heat engine, in particular heat pump heater, having at least one refrigerant circuit (32a) and having at least one electric motor device integrated into the refrigerant circuit (32a), in particular a compressor, according to Claim 7.

Description

State of the art A method for the low-noise operation of an electric motor device, in particular a compressor, has already been proposed, in which, in at least one process step, a control signal dependent on a controlled variable is transmitted to an electric motor of the electric motor device. See also EP2012425 A1 . Disclosure of the invention The invention relates to a method according to claim 1 for a low-noise operation of an electric motor device, in particular a compressor, wherein in at least one method step of the method a control signal dependent on a control variable is transmitted to an electric motor of the electric motor device. It is proposed that the control signal be generated as a function of harmonic control of the controlled variable and as a function of stabilization control of the controlled variable. The method preferably includes a basic control system for setting an operating point of the electric motor device. The harmonic control and stabilization control are preferably performed in addition to the basic control. The electric motor device preferably includes a control unit that performs the basic control, the harmonic control, and/or the stabilization control. The basic control system is preferably a vector control system, particularly preferably... a field-oriented control, alternatively a direct self-control, a space vector modulation or a model predictive control. The electric motor preferably comprises a stator, a rotor, and a drive shaft attached to the rotor for transmitting torque to a load arranged on the drive shaft. The load is, for example, a conveying element for conveying a fluid and/or a compression element for compressing the fluid. The fluid is, for example, a heat transfer medium, in particular a coolant, preferably a refrigerant. Alternatively, the electric motor is part of a traction drive with a gearbox or has another load that exhibits load ripple. The operating point is preferably determined by the torque supplied via the drive shaft and/or a rotational speed of the rotor. The controlled variable is preferably the rotational speed of the rotor, the torque supplied via the drive shaft, or an equivalent or proportional quantity, for example, a frequency of the rotor, a force transmitted to the load, or the like. The stabilization control is preferably designed to reduce fluctuations in the controlled variable around the operating point defined by the basic control, compared to fluctuations that would occur with only the basic control. The stabilization control and/or the harmonic control are preferably designed to reduce fluctuations in the controlled variable caused by a changing, particularly periodically changing, load. Preferably, the harmonic control and the stabilization control complement each other. The control signal preferably comprises a signal component defined by the basic control, a signal component defined by the harmonic control, and a signal component defined by the stabilization control. The stabilization control can be designed to react to a change in the load, particularly faster than the basic control, or to add a compensation signal determined prior to the process to the control signal in order to counteract an anticipated load profile. The harmonic control is preferably designed to control at least one oscillation of the electric motor at a fixed frequency, in particular The control unit is designed to counteract or amplify a harmonic of a frequency corresponding to the operating speed. It preferably comprises at least one harmonic controller, which performs the harmonic control. Optionally, the control unit includes multiple harmonic controllers, preferably designed to influence vibrations of the electric motor at different frequencies and/or harmonics. The stabilization control preferably acts simultaneously on several vibrations, i.e., on a fluctuation encompassing multiple vibrations. The design according to the invention allows for a significant and advantageous damping of vibrations and noise from the electric motor device. In particular, vibrations and noise can be effectively reduced. Furthermore, the method can advantageously be carried out even with low computing power of the control unit. In particular, a high degree of flexibility can be achieved to respond to various situations and/or requirements. Moreover, the method can be implemented with a significantly smaller number of controllers, especially compared to pure harmonic control. Furthermore, the control parameters of the electric motor can be precisely determined using harmonic control. For example, with a control unit of a given computing power, the number of harmonic controllers used can be adjusted to achieve maximum noise optimization with the available computing power. In particular, a high degree of flexibility and stability can be achieved with the harmonic controllers for the most relevant frequencies and/or harmonics, since, for example, all effects up to the