Wound-rotor motor rotor mutual inductance parameter identification method
Technical field
The present invention relates to a kind of wound-rotor motor parameter identification method, particularly relate to a kind of wound-rotor motor rotor mutual inductance parameter identification method.
Background technology
Wound-rotor motor is widely used in elevator, crane, tower crane etc. to be needed heavy-load start and needs in the place of speed governing.Vector control technology can make wound-rotor motor obtain the transient response characteristic consistent with separately excited DC machine, realizes the quick response to load disturbance and reference value change, is applied widely.The analysis on Operating of wound-rotor motor vector control and high performance control system all need accurately to know wound-rotor motor rotor mutual inductance parameter.But rotor mutual inductance parameter producer does not generally provide.Even if producer can provide, due to the impact of the various factors such as generating material, assembly technology, same batch, parameter between same model motor also can exist certain difference.Therefore, the quick and precisely discrimination method seeking wound-rotor motor rotor mutual inductance parameter is necessary.At present, known prior art is the rotor mutual inductance parameter being obtained wound-rotor motor by stall and no load test.Therefore, the identification time of prior art is longer, workload is comparatively large, be subject to the subjective factor impact of operating personnel, and most use scene does not have this actual measurement condition, adds the application difficulty of vector control.Therefore, how fast and accurately the rotor mutual inductance parameter of identification wound-rotor motor, becoming prior art has problem to be solved.
Summary of the invention
The defect that the object of the invention is to exist for prior art proposes a kind of wound-rotor motor rotor mutual inductance parameter identification method.
Wound-rotor motor rotor mutual inductance parameter identification method of the present invention, comprises the following steps:
Step 1: wound-rotor motor rotor windings is opened a way;
Step 2: adopt stator current control unit output stator q shaft current to be 0, stator d shaft current is the control signal of ramp signal;
Stator d shaft current in control signal is less than the rated current of wound-rotor motor;
Step 3: adopt power drive unit to receive described control signal output driving current;
Drive current is less than the rated current of wound-rotor motor;
Step 4: adopt wound-rotor motor stator winding to receive described drive current;
Step 5: adopt voltage sensor to measure wound-rotor motor rotor windings and obtain rotor d shaft voltage signals;
Step 6: adopt identification unit to receive described control signal and rotor d shaft voltage signals, and with the slope of rotor d shaft voltage divided by stator d shaft current, obtain rotor mutual inductance parameter.
The tedious work that the present invention can save Artificial Cognition and the error caused thus, and calculate simple, the identification time is few.
Accompanying drawing explanation
Fig. 1 is identification system block diagram of the present invention.
Embodiment
As shown in Figure 1.Wound-rotor motor rotor mutual inductance parameter identification system of the present invention, comprise stator current control unit 101, power drive unit 102, wound-rotor motor stator winding 103, wound-rotor motor rotor windings 104, voltage sensor 105 and identification unit 106, wherein the output of stator current control unit 101 respectively with the input of power drive unit 102, an input of identification unit 106 connects, the input of the output termination wound-rotor motor stator winding 103 of power drive unit 102, the input of the output termination voltage sensor 105 of wound-rotor motor rotor windings 104, another input of the output termination identification unit 106 of voltage sensor 105.
Composition graphs 1 describes wound-rotor motor rotor mutual inductance parameter identification method of the present invention, comprises the following steps:
Step 1: wound-rotor motor rotor windings is opened a way;
Step 2: adopt stator current control unit output stator q shaft current to be 0, stator d shaft current is the control signal of ramp signal;
Stator d shaft current in control signal is less than the rated current of wound-rotor motor.
Step 3: adopt power drive unit to receive described control signal output driving current;
Drive current is less than the rated current of wound-rotor motor;
Step 4: adopt wound-rotor motor stator winding to receive described drive current;
Step 5: adopt voltage sensor to measure wound-rotor motor rotor windings and obtain rotor d shaft voltage signals;
Step 6: adopt identification unit to receive described control signal and rotor d shaft voltage signals, and with the slope of rotor d shaft voltage divided by stator d shaft current, obtain rotor mutual inductance parameter.