1. A method for determining a rotor position of a synchronous motor, comprising the steps of:
applying to a synchronous motor a plurality of current vectors having different directions;
determining absolute values of required ones of the current vectors to obtain a defined excursion of the rotor;
determining inverse values of the determined absolute values of the current vectors;
digitally filtering using several of the inverse values to determine Fourier coefficients of a first harmonic of the determined inverse values; and
computing with the determined Fourier coefficients the rotor position of the synchronous motor.
2. The method of claim 1, wherein an opposite mathematical sign is applied to the determined inverse values in a range of a negative excursion of the rotor before determining the Fourier coefficients.
3. The method of claim 2, wherein the Fourier coefficients of the first harmonic of the determined inverse values are determined by digitally filtering using all inverse values.
4. The method of claim 2, wherein the Fourier coefficients of the first harmonic of the inverse values are determined by digitally filtering only the inverse values that are in the range of the negative excursion of the rotor.
5. The method of claim 1, wherein the Fourier coefficients of the first harmonic of the inverse values are determined by digitally filtering using several inverse values only in a range of a positive excursion of the rotor.
6. The method of claim 1, and further comprising the step of applying a brake to hold the rotor before applying the plurality of current vectors.
7. A data carrier having a computer program stored thereon for carrying out the method of claim 1.
8. A computer with a program memory having stored therein a computer program, said computer program causing the computer to execute the method of claim 1.
9. The computer of claim 8, wherein the computer comprises a controller.
10. A machine-tool or production machine comprising a controller according to claim 9.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A solder paste containing a halogen compound, characterized in that the halide ion concentration in one gram of flux is 3000 ppm or less as converted to chloride ion concentration.
2. A solder paste as described in claim 1, wherein the halide ion is a bromide ion.
3. A solder paste as described in claim 1 or 2, wherein solder powder contains Zn.
4. A method for soldering a circuit board, characterized by comprising applying a solder paste as described in claim 1 or 2 onto the circuit board and causing the applied solder paste to reflow.
5. A method for soldering a circuit board, characterized by comprising applying a solder paste which contains Zn as solder powder as described in claim 1 or 2 onto the circuit board and causing the applied solder paste to reflow.
6. A joint produced through a method for soldering a circuit board, wherein the method comprises
applying a solder paste as described in claim 1 or 2 onto the circuit board; and,
causing the applied solder paste to reflow.
7. A joint produced through a method for soldering a circuit board, wherein the method comprises
applying a solder paste which contains Zn as solder powder as described in claim 1 or 2 onto the circuit board; and,
causing the applied solder paste to reflow.