VR Resolver OD117 Series for Use in Harsh Environments of Petrochemical Industry

Classification of Resolvers:

1. Positive and negative cosine variable transformation. During operation, the function between the output voltage and the rotor rotation angle can be either sin or cos.

2. Linear flux linkage: The output voltage and the rotor angle have a linear functional relationship. Considering the 

differences in rotor structure, there are two types of flux linkage: salient-pole type and non-salient-pole type.

3. Proportional rotational variation: The output voltage is in a proportional relationship with the rotor angle.

The application of Resolver:

The rotary transformer, as a professional measuring device, can precisely measure angles, positions and speeds. It can basically replace the rotary encoder because the rotary encoder is not suitable in many situations, such as high temperatures, extreme cold, humidity, high speeds, etc. However, the rotary transformer can be used and is commonly applied in servo control systems, aerospace, oil fields, automobiles, power, chemical industries, construction, etc., for angle and position detection systems.

Live Applications of Variable Reluctance (VR) Rotary Transformers

• rail transit field

High-speed train and urban rail traction permanent magnet motors; locomotive auxiliary motors.

Operating conditions: -40 to 125°C, vehicle body shock and vibration, strong electromagnetic noise from high-power converters; installed at the traction motor end to detect rotor position for vector control, with some models domestically replacing imported wound resolvers.

• Aerospace and Special Military Applications

Meets DO-160 and GJB military standards, resistant to high and low temperatures, shocks, radiation, and vacuum degassing.

1. Aircraft engine FADEC control systems, helicopter actuators: high-temperature engine areas, servo motor position feedback.

2. Spacecraft attitude control actuators, onboard servos.

3. Downhole oil and gas equipment, underwater marine actuators: high temperature and high pressure downhole, electronic components cannot be placed on the rotor side, reluctance resolver rotors made entirely of silicon steel laminations, extremely reliable.

• Other niche real-world scenarios

- Energy storage flywheel motors: high-speed rotation, vacuum environment;

- Electrification of construction machinery and heavy trucks: hydraulic pump-driven motors;

- Auxiliary motors for electric ship propulsion.

Please contact our sales team for details regarding model naming.

info@start-motors-tech.com (Mr.Louis)