A resolver is a type of electromagnetic sensor. It is a type of AC motor used to measure the rotation angle signal and the rotation axis position, speed, and angular speed of a rotating object. It is composed of a stator and rotor. As the primary side of the transformer, the stator winding receives the excitation voltage, and the excitation frequency is usually 400/1800/3000/10000Hz, etc. As the secondary side of the transformer, the rotor winding obtains the induced voltage through electromagnetic coupling.
Comparison of Same Functional Products
| Product | Advantage | Disadvantage |
| Optical Encoder | Improves the accuracy. | Not good in mechanical abuse and high temperature. Easy to be interfered by radiation, high maintenance frequency, incapable to be used in severe working environments. Highest price. |
| Hall Sensor | Low price. | Low discrimination limits control accuracy, and the Hall component weakens after being heated for a long time, thus shortening the service life. |
| Resolver | Resistance to impact, high temperature, and oil stains, high reliability, long life, etc. | The output is an analog signal, the decoding is more complicated. |
Performance Parameters
| Number of Pole-pairs | 2X | 3X | 4X | Customize |
| Dimension (mm) | φ37, φ52, φ65, φ74, φ101 | φ37, φ52, φ65, φ74, φ101 | φ37, φ52, φ65, φ74, φ101 | Customize |
| Input Voltage | AC7Vrms, 10Hz | AC7Vrms, 10Hz | AC7Vrms, 10Hz | AC7Vrms, 10Hz |
| Transformer Ratio | 0.286 ± 10% | 0.286 ± 10% | 0.286 ± 10% | 0.286 ± 10% |
| Temperature | -40°C to +150°C | -40°C to +150°C | -40°C to +150°C | Customize |
| Accuracy | ±60' | ±45' | ±30' | Customize |
| Phase Shift | 0° ±15° | 0° ±15° | 0° ±15° | Customize |
| Input Impedance | 75Ω to 150Ω (can be customized on demand) | 75Ω to 150Ω (can be customized on demand) | 75Ω to 150Ω (can be customized on demand) | Customize |
Introduction of Customized Product
Stator External Diameter: φ66mm
Stator Thickness: 7mm
Rotor Internal Diameter: 30.5mm
Rotor Thickness: 7mm
Input Voltage: AC 7V, 10KHz
Excitation Winding: R1-R2
Number of Pole-pairs: 3X
Transformer Ratio: 0.286 ± 10%
Input Impedance: 75Ω ± 20%
Output Impedance: 215Ω
Phase Shift: -3° ~ 4°
Accuracy: ±25'
Stator External Diameter: φ132mm
Stator Thickness: 3.85mm
Rotor Internal Diameter: φ55mm
Rotor Thickness: 6mm
Number of Pole-pairs: 5X
Input Voltage: AC 7Vrms, 10KHz
Excitation Winding: R1-R2
Transformer Ratio: 0.286 ± 10%
Input Impedance: 80Ω ± 15% (WHT-GRE)
Output Impedance: 305Ω ± 20% (RED-BLK, YEL-BLU)
Phase Shift: -1° ~ 7°
MAX Operating Speed: 15000RPM (service condition, not upper limit)
Accuracy: ±24' Min Max
Withstand Voltage: AC 500V for 1 min (60Hz)
Withstand Voltage: AC 250V for 1 min (60Hz)
Insulation Resistance: 100MΩ Min DC 500V
Stator External Diameter: φ110mm
Stator Thickness: 4mm
Rotor Internal Diameter: φ51mm
Rotor Thickness: 4mm
Number of Pole-pairs: 3X
Input Voltage: AC10Vrms MAX
Excitation Frequency: AC10KHz NOM
Transformer Ratio: 0.286 ± 10%
Input Impedance: 120Ω ± 20%
Output Impedance: 240Ω ± 20%
Phase Shift: -5° ~ 10°
MAX Operating Speed: 30000RPM (service condition, not upper limit)
Accuracy: ±40' Max
Insulation Resistance: 2100MΩ
Stator External Diameter: φ160mm
Stator Thickness: 6mm
Rotor Internal Diameter: φ93mm
Rotor Thickness: 7mm
Number of Pole-pairs: 8X
Input Voltage: AC 7Vrms, 10KHz
Excitation Winding: R1-R2
Transformer Ratio: 0.286 ± 10%
Input Impedance: 110Ω ± 10%
Output Impedance: 520Ω ± 15%
Phase Shift: -12.5° NOM
MAX Operating Speed: 7200RPM (service condition, not upper limit)
Accuracy: ±20' Max
Dielectric Strength: AC 500V for 1 min
Insulation Resistance: 100MΩ Min
