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ST-VR89
start-motors
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With a simple structure and no coupling transformer, it is brushless, highly accurate, low-cost, and has low environmental requirements. It facilitates the integration of the transmission system and utilizes the rotor salient pole effect to induce sine and cosine signals related to the rotation angle in the stator windings, achieving non-contact, highly reliable angular position detection. It is widely used in electric vehicles, servo control, and other fields, and can replace traditional rotary transformers. Applications include automotive electronic power steering (EPS), mining machinery (underground coal trucks, conveyor belt motors, etc.), and high-speed trains.
Core advantages
Simple and reliable structure: Both the excitation winding and output winding are fixed on the stator, and the rotor has no windings, brushes, or slip rings, achieving completely contactless operation and improving reliability.
High precision: The signal is generated by the change in air gap permeability caused by the salient pole effect of the rotor, resulting in extremely high precision, reaching the "second" level.
Low cost: The simplified structure reduces material and processing costs.
Easy integration: Small size and light weight make it easy to integrate with motor drive systems.
Strong anti-interference ability: The brushless structure requires less demanding environmental conditions and has good anti-interference capabilities.
Main Applications:
1、Automotive industry: Electronic power steering (EPS), electric vehicle drive systems.
2、Industrial automation: High-precision servo motors, CNC machine tools.
3、Rail transit: High-speed rail motor control.
4、Other: Aerospace, mining machinery, and other fields.
FAQ （Frequently Asked Questions）
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)
With a simple structure and no coupling transformer, it is brushless, highly accurate, low-cost, and has low environmental requirements. It facilitates the integration of the transmission system and utilizes the rotor salient pole effect to induce sine and cosine signals related to the rotation angle in the stator windings, achieving non-contact, highly reliable angular position detection. It is widely used in electric vehicles, servo control, and other fields, and can replace traditional rotary transformers. Applications include automotive electronic power steering (EPS), mining machinery (underground coal trucks, conveyor belt motors, etc.), and high-speed trains.
Core advantages
Simple and reliable structure: Both the excitation winding and output winding are fixed on the stator, and the rotor has no windings, brushes, or slip rings, achieving completely contactless operation and improving reliability.
High precision: The signal is generated by the change in air gap permeability caused by the salient pole effect of the rotor, resulting in extremely high precision, reaching the "second" level.
Low cost: The simplified structure reduces material and processing costs.
Easy integration: Small size and light weight make it easy to integrate with motor drive systems.
Strong anti-interference ability: The brushless structure requires less demanding environmental conditions and has good anti-interference capabilities.
Main Applications:
1、Automotive industry: Electronic power steering (EPS), electric vehicle drive systems.
2、Industrial automation: High-precision servo motors, CNC machine tools.
3、Rail transit: High-speed rail motor control.
4、Other: Aerospace, mining machinery, and other fields.
FAQ （Frequently Asked Questions）
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)
