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Resolver operating principle
It consists of an excitation winding (also called excitation windings R1-R2) and two-phase orthogonal return windings (S1-S2, S3-S4). When the excitation winding is supplied with a high-frequency excitation signal, the return windings will induce a voltage signal with a certain amplitude and frequency. The output voltage is a high-frequency signal with a sinusoidal envelope, which contains the rotor position information. The relationship between the input and output voltages of the rotary transformer is shown in the figure.
Core Advantages
Simple and Reliable Structure: Both the excitation winding and output winding are fixed to the stator; the rotor has no windings, brushes, or slip rings, achieving completely non-contact operation and improving reliability.
High Precision: Signals are generated using the change in air gap permeability caused by the rotor salient pole effect, achieving extremely high precision, down to the second level.
Low Cost: The simplified structure reduces material and processing costs.
Easy Integration: Small size and light weight facilitate integration with motor drive systems.
Strong Anti-interference Capability: The brushless structure has low environmental requirements and excellent anti-interference capabilities.
Common application areas
Rotating Machinery Systems: Resolvers are commonly used in mechanical systems requiring continuous rotation, such as rotary tables, rotating platforms, and wind turbine machinery systems. In these applications, resolvers transmit control signals, electrical signals, or data signals without being limited by rotational motion.
Radar Systems: Radar antennas typically need to rotate continuously to detect targets in different directions. Resolvers are used to transmit electrical energy and control signals during radar rotation, ensuring the radar system can operate continuously.
Spacecraft and Satellites: Some spacecraft and satellites need to rotate to change orientation or perform other tasks. Resolvers can be used to transmit power and control signals during rotation.
Industrial Automation: In industrial automation systems, especially for automated equipment that requires rotation, resolvers are used to transmit power and signals, enabling the equipment to perform control tasks during operation.
Automotive Industry: In automobiles, resolvers are primarily used to transmit power, signals, and data to support the normal operation of various electronic and electrical systems. These systems can include driver assistance technologies, safety systems, entertainment systems, etc.
FAQ
Q1：What is a resolver and where are it used?
A resolver is a brushless angle feedback system based on the principle of electromagnetic induction, producing an absolute analog signal. It is primarily used to control the speed of servo motors. Compared to rotary encoders, resolvers have a wider range of applications (e.g., robotics, automotive, transportation, aerospace, and military). Depending on the design, the operating temperature range can be -55°C to 155°C. Resolvers are unaffected by radioactivity and can be used in absolute vacuum (space). Maximum speeds can reach 90,000 rpm.
Q2：Why did the resolver control unit report an error during the first test?
Are the frequency, input voltage, turns ratio, and current loss of the resolver consistent with the values set by the control unit。Stranded cable (input voltage, Sin, Cos)
Is there any electromagnetic interference (from motor brakes, excessively long cables)
Q3：Why can resolver products in the same series have different specifications?
Because servo controllers commonly found on the market come in different frequencies and voltages. The data on resistance and phase shift in the three tables correspond to various resistances, impedance strengths, and phase shifts under two to three different input frequencies and feedback voltages. We provide you with the necessary information to help you select the correct analog-to-digital converter or appropriate control components.
Q4：How to install and secure the stator and rotor of a rotary transformer?
The stator is mounted to the bearing housing of the motor. It is secured using clamps or snap rings.
The rotor is typically glued to the rotating shaft. For some special shapes or security applications, the rotor can be secured to the shaft using axial screws. For larger shaft diameters, the rotor is secured with radial clamping screws (e.g., set screws).
Q5：What is the accuracy of the resolver?
Standard resolvers have an absolute measurement accuracy of ±10'. In most cases, this accuracy is sufficient for speed control units with typical systems. For applications requiring higher precision positioning, we also offer resolvers with absolute measurement accuracies of ±6' and ±4'.
Please contact our sales team for details regarding model naming.
info@start-motors-tech.com (Mr.Louis)
Resolver operating principle
It consists of an excitation winding (also called excitation windings R1-R2) and two-phase orthogonal return windings (S1-S2, S3-S4). When the excitation winding is supplied with a high-frequency excitation signal, the return windings will induce a voltage signal with a certain amplitude and frequency. The output voltage is a high-frequency signal with a sinusoidal envelope, which contains the rotor position information. The relationship between the input and output voltages of the rotary transformer is shown in the figure.
Core Advantages
Simple and Reliable Structure: Both the excitation winding and output winding are fixed to the stator; the rotor has no windings, brushes, or slip rings, achieving completely non-contact operation and improving reliability.
High Precision: Signals are generated using the change in air gap permeability caused by the rotor salient pole effect, achieving extremely high precision, down to the second level.
Low Cost: The simplified structure reduces material and processing costs.
Easy Integration: Small size and light weight facilitate integration with motor drive systems.
Strong Anti-interference Capability: The brushless structure has low environmental requirements and excellent anti-interference capabilities.
Common application areas
Rotating Machinery Systems: Resolvers are commonly used in mechanical systems requiring continuous rotation, such as rotary tables, rotating platforms, and wind turbine machinery systems. In these applications, resolvers transmit control signals, electrical signals, or data signals without being limited by rotational motion.
Radar Systems: Radar antennas typically need to rotate continuously to detect targets in different directions. Resolvers are used to transmit electrical energy and control signals during radar rotation, ensuring the radar system can operate continuously.
Spacecraft and Satellites: Some spacecraft and satellites need to rotate to change orientation or perform other tasks. Resolvers can be used to transmit power and control signals during rotation.
Industrial Automation: In industrial automation systems, especially for automated equipment that requires rotation, resolvers are used to transmit power and signals, enabling the equipment to perform control tasks during operation.
Automotive Industry: In automobiles, resolvers are primarily used to transmit power, signals, and data to support the normal operation of various electronic and electrical systems. These systems can include driver assistance technologies, safety systems, entertainment systems, etc.
FAQ
Q1：What is a resolver and where are it used?
A resolver is a brushless angle feedback system based on the principle of electromagnetic induction, producing an absolute analog signal. It is primarily used to control the speed of servo motors. Compared to rotary encoders, resolvers have a wider range of applications (e.g., robotics, automotive, transportation, aerospace, and military). Depending on the design, the operating temperature range can be -55°C to 155°C. Resolvers are unaffected by radioactivity and can be used in absolute vacuum (space). Maximum speeds can reach 90,000 rpm.
Q2：Why did the resolver control unit report an error during the first test?
Are the frequency, input voltage, turns ratio, and current loss of the resolver consistent with the values set by the control unit。Stranded cable (input voltage, Sin, Cos)
Is there any electromagnetic interference (from motor brakes, excessively long cables)
Q3：Why can resolver products in the same series have different specifications?
Because servo controllers commonly found on the market come in different frequencies and voltages. The data on resistance and phase shift in the three tables correspond to various resistances, impedance strengths, and phase shifts under two to three different input frequencies and feedback voltages. We provide you with the necessary information to help you select the correct analog-to-digital converter or appropriate control components.
Q4：How to install and secure the stator and rotor of a rotary transformer?
The stator is mounted to the bearing housing of the motor. It is secured using clamps or snap rings.
The rotor is typically glued to the rotating shaft. For some special shapes or security applications, the rotor can be secured to the shaft using axial screws. For larger shaft diameters, the rotor is secured with radial clamping screws (e.g., set screws).
Q5：What is the accuracy of the resolver?
Standard resolvers have an absolute measurement accuracy of ±10'. In most cases, this accuracy is sufficient for speed control units with typical systems. For applications requiring higher precision positioning, we also offer resolvers with absolute measurement accuracies of ±6' and ±4'.
Please contact our sales team for details regarding model naming.
info@start-motors-tech.com (Mr.Louis)
