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Anonymous users2024-02-06Precise and timely resolver angle output. Before finding a way to utilize resolvers to mitigate the effects of electromagnetic interference on industrial systems, it is important to understand why precise position control is essential. The resolver provides an analog output that is theoretically equivalent to infinite resolution.
An analog-to-digital conversion technique that limits the resolution by the extent to which the output is divided into blocks or steps. Finite segmentation of the sustained angle will result in quantitative errors. For example, a 12-bit resolution converter is used to provide the angular output.
One rotation of the converter shaft is divided into 4096 steps (2 12 corresponds to a 12-bit resolution). Since one degree is equal to 60 minutes, one rotation (360 degrees) is equal to 21,600 arc minutes (60x360). Then the interval between each step is the arc minute (21600 4096).
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Anonymous users2024-02-051. Generally, two-phase motors require a two-phase magnetic field that differs by 90° in space and time.
Although the two-phase windings of the resolver are perpendicular to each other in the space hole, in most applications, the power supply is always supplied by one phase winding at a time, and the other phase is used as the compensation winding, or the two phases are connected with the voltage of the same phase at the same time; Moreover, the two-phase windings on the secondary side are also perpendicular to each other, and there is no electromagnetic coupling between the two-phase windings. Therefore, in the electromagnetic calculation, it should be calculated according to the single-phase motor.
2. The resolver usually works in a near-no-load state, and the rotor rotation will not cause a great change in the excitation current on the primary side, and the design can be calculated according to the no-load state of the stator and rotor in the maximum coupling position.
3. The load of the resolver is low, and the temperature rise and mechanical calculation are generally not carried out, and the loss calculation is simplified. The purpose of calculating the loss is to find the active excitation current. When there is no load, the active component in the excitation current of the primary winding is very small, and the excitation current largely depends on its reactive component.
In order to simplify the calculation, the reactive power component is often multiplied by a current coefficient slightly greater than 1 to obtain the excitation current. Experiments have proved that the current coefficient varies with the punching material, the size of the frame number and the processing conditions, etc., and the grinding silver is generally in between.
4. The smaller the ratio of the short-circuit output impedance of the resolver to the load impedance, the smaller the distortion of the output voltage. Therefore, the resolver should have the smallest possible short-circuit output impedance.
5. The main function of the resolver is to output an electrical signal that is sinusoidal or cosine function with the rotor angle.
When designing, the winding type, stator and rotor cogging coordination, magnetic permeability material and magnetic flux density should be selected from the accuracy to ensure that the air gap magnetic field of the resolver is distributed according to the sinusoidal law.
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Anonymous users2024-02-04The stator winding D1-D2 is connected to the AC power supply excitation, and the rotor winding Z1 Z2 is connected to the load ZlWhen the main shaft drives the rotor to turn the angle, the induced voltage generated in each winding of the rotor is respectively the ratio (transformation ratio) of the effective turns of the rotor winding in the formula where k is a phase fixed. If the rotor winding is used for excitation, the expression is the same when the stator winding is output (but the k value is different). By using different wiring methods or different winding structures, the output voltage can be obtained with a different functional relationship with the corner forest.
With different structures, it can also be made into resolvers for special purposes such as ballistic function, circular function, sawtooth wave function, dust swimming, etc. Two identical sine and cosine resolvers can be used to form a single-channel goniometric system. One resolver is the transmitter and the other is the control transformer.
The transmitter is excited by an AC power source. The accuracy of the resolver is 6, and the precision of the single-channel system is not less than 6. <
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