3.1.3.5.4.3 Method 2
Attention
This method is still in prototype phase and can be tested at the user’s own risk.
This algorithm has the following characteristics:
It needs no movement (no rotation)
If a brake is available, the brake should be engaged while offset detection method 2 is in progress.
Attention
If no brake is available and mechanical load is relatively small (compared to rated motor torque), then
offset detection method 2 can lead to rotor movement
It is not able to hold the load. As a result, when a brake is present, the brake will remain engaged
during the procedure of offset detection method 2.
It can take up to 250 milliseconds.
The precision of method 2 is not as high as methods 0 or 1.
Note
This method can cause audible noise when it’s executed.
3.1.3.5.4.3.1 Comparison of methods
The optimal method depends on the use-case. The following tables shows the advantages and disadvantages
of each method.
Method #
Method #
Tuning
Tuning
necessary?
necessary?
Able to hold a
Able to hold a
load?
load?
Precision of
Precision of
measurement
measurement
Rotation required
Rotation required
Notes
Notes
0
No
Yes
Good
up to 1 pole-pair
range
1
Yes
Yes
Good
Depends on
quality of tuning.
Typically less
than 20 electrical
degrees.
2
No
No*
Less good
None
Duration up to 250 ms
Can cause audible noise
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