The Key Features And Applications of Resolvers

<一>. Core Features of Resolvers

No optical components, resistant to vibrations, high temperatures, oil and dust, and electromagnetic interference. It's suitable for harsh conditions where optical encoders tend to fail, and can be used to detect shaft angle, rotor position, and speed, supporting vector control and angle positioning closed-loop for permanent magnet synchronous motors.

<二>. Use cases of Resolvers

1. New Energy Vehicles (currently the largest usage)

• Main drive motor (permanent magnet synchronous motor) rotor position detection, used for FOC vector control

• Hybrid model ISG, BSG motors, onboard air compressors, oil pump motors

• Features: withstand high temperatures of -40~150°C, strong electromagnetic interference, long-term vibration

2. Industrial Automation and Servos

• Industrial robot joint servo motors (six-axis robots, collaborative robots)

• CNC machine tools, machining center turntables, spindle servos, turret positioning

• High-power servo motors, injection molding machines, metallurgical rolling mills, mining equipment, lifting equipment

• Textile and printing high-power equipment servos, rotary transformers are preferred in dusty and oily environments

3. Wind Power and Hydropower Equipment

• Wind turbine pitch motor position feedback (high temperatures in the nacelle, strong vibration)

• Hydraulic turbine guide vane adjustment, large generator servo drives

4. Aerospace

• Servos, control surface position feedback, engine rotor position

• Inertial stabilization platforms, airborne electro-optical pods, satellite attitude mechanisms

• High altitudes, low temperatures, strong vibrations, radiation environments, extremely high reliability requirements

5. Ships and Underwater Equipment

• Ship propulsion motors, servos, radar antenna turntables

• Underwater robots, underwater thrusters, humid, high-pressure, corrosive environments

6. Military Equipment

• Turret servos, radar antennas, missile launchers, electro-optical tracking turntables

• Strong against electromagnetic pulses and shock vibrations, with anti-interference better than optical encoders

7. Other Niche Scenarios

1. Traditional computing uses: early analog computers, trigonometric calculations, coordinate transformations, angle transmissions

2. Special electric tools, construction machinery (excavators, loaders with hydraulic servos)

3. Medical high-power motors, equipment for radiation environments (radiation-resistant)