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# Basic parameters and performance indicators of resolver

1) Rated excitation voltage and excitation frequency Generally below 10V. Frequency-between 400Hz and (5～10)kHz.

2) No-load current and no-load power consumption. To

3) Transformation ratio and maximum output voltage When the output winding is at the position where the maximum output voltage is induced, the ratio of the output voltage to the primary excitation voltage. For the resolver transmitter, when θF=0° or θF=90°, for the resolver transformer, one-phase winding is connected to the rated voltage, and the ratio of the output voltage value to the excitation voltage value.

4) Electrical error The relationship between the output electromotive force and the rotation angle should be strictly sine and cosine. Inconsistency-produces an error, called electrical error (mechanical angle).

Multipoles are measured in arc seconds (");

Unipolarity is within (5′～15′);

Magnetoresistive type generally achieves more than two pairs of poles, and the electrical error is relatively large. The two pairs of poles reluctance resolver is less than 60' (1°). For magnetoresistive type, increase the number of pole pairs-improve accuracy, electrical error-a few arc seconds (").

5) Impedance

is related to the mutual angular position between the primary and secondary, the specific position should be taken when measuring, and the resolver is regarded as a four-terminal transformer network. When measuring primary parameters, apply voltage to the primary winding, and when measuring secondary parameters, apply voltage to the secondary winding.

To

6) Phase shift

The phase difference between the secondary output voltage and the primary excitation voltage in time. Factors related to the size of the phase difference-resolver type, size, structure and excitation frequency.

7) Reference phase The reference phase refers to the phase of the first fundamental maximum voltage that appears when the resolver starts from the reference electrical zero position and rotates in the forward direction.

Phase specification method: ①The phase of the primary excitation voltage is the reference; ②The phase at the maximum output of the secondary voltage is the reference.

8) Zero voltage, 2 components: ①The component where the reference phase intersects, ②High-order harmonic components.

Electrical zero point-the point where the fundamental in-phase component of the output voltage is zero, and the voltage at this time is called the zero voltage. There are only fundamental quadrature components and higher harmonic components in the zero voltage. For each electrical cycle, there are four electrical zero positions, two for each phase: 0°, 90°, 180°, 270°. When the number of pole pairs is greater than 1, the number of electrical zeros is a multiple of the number of pole pairs. To

9) Reference electrical zero

Select 0° from the electrical zero position as the electrical reference zero position.

10) Insulation dielectric strength

Dielectric strength is a measure of the electrical strength of a material or product when it is used as an insulator. It is defined as the maximum voltage per unit thickness that the sample can withstand when the sample is broken down. It is expressed as volts per unit thickness. The greater the dielectric strength of a substance, The better its quality as an insulator.

11) Insulation resistance

Insulation resistance is the DC resistance under specified conditions, half of which are in the megohm level. Changes in temperature and humidity will directly affect the insulation resistance of the product.

12) Electrical error

The degree of compliance with the specific functional relationship between output and input is called accuracy, that is, electrical error.

13) Resolution

The input and output of the sensor cannot be absolutely continuous. Sometimes, the input quantity begins to change, but the change quantity is too small, and the output quantity does not change accordingly, but when the input quantity changes to a certain degree, the output quantity suddenly produces a Small step changes, this is a problem of resolution.

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