Apparatus and method for determining resolver angle

Abstract

The invention concerns a method and apparatus (28) for determining an angle (9) by means of a resolver (3). In the method, an excitation signal (29) of constant frequency is supplied to the resolver (3), the resolver response signals (13, 14) are measured, successive (16) measurements of each response signal are stored into a sample buffer (5), FIR filtering (10) is computed for the response signal values (16) present in the sample buffer (5) at the instant of computation, the computation points (23, 24) and the set of computation result values (18) corresponding to these points are stored in memory, at least two sets of values (18, 19) of computation results are compared to each other and of these the value set Amax (19) which contains the highest computation result as an unsigned value is selected, and FlR filtering (10) is repeatedly computed at the computation points (25, 26) corresponding to value set Amax (19).

Description

technical field [0001] The invention relates to a method as defined in the preamble of claim 1 and a device as defined in the preamble of claim 4 for determining an angle by means of a resolver. Background technique [0002] In this context, a resolver generally refers to a device having at least one input for an excitation signal and at least two outputs for a response signal. Both the excitation signal and the response signal are AC signals. When the resolver's primary and secondary windings are displaced relative to each other, the response signal changes. The angle between the primary winding and the secondary winding can be determined with the response signal, eg by using existing trigonometric functions. [0003] Commonly used resolvers of the converter type have an input on the primary side and two outputs on the secondary side. The resolver primary winding has a magnetizing winding which is supplied with an alternating current of constant amplitude and frequency a...

AI Technical Summary

Problems solved by technology

The problem with this type of approach is that high order FIR filters require very large computing power on the processor

However, determining the resolver angle in the manner described in the above description requires a lot of computing power, which is why the proposed method and apparatus are relatively expensive and complicated to implement

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