Characteristics And Application Areas of Wound Resolver And Variable Reluctance Resolver

In the realm of motor position sensing, wound resolvers and variable reluctance resolvers (VRRs) play pivotal roles, each with distinct characteristics and favored application domains.

Wound Resolver

Characteristics:

1. Construction and Operation: Wound resolvers consist of a stationary stator and a rotating rotor, both equipped with windings. The stator windings receive an excitation voltage, inducing an electromotive force (EMF) in the rotor windings through electromagnetic coupling. This EMF varies sinusoidally with the rotor's angular position, allowing for accurate position sensing.

2. Precision and Resolution: They offer high precision and resolution, making them suitable for applications requiring fine control over position and speed. The use of multiple pole pairs can further enhance data acquisition accuracy.

3. Durability: Wound resolvers are known for their durability, capable of withstanding extreme temperatures, vibrations, and shocks. This makes them reliable in harsh environments.

4. Signal Processing: The output signal from the rotor windings, typically a modulated sine wave, requires demodulation to extract the angular position information.

Application Areas:

1. Automotive Industry: Used in electric vehicles and hybrid electric vehicles for motor control, providing accurate position feedback for precise torque and speed control.

2. Industrial Automation: Found in servo motors, CNC machines, and robotic systems, where precise position and velocity control are essential.

3. Aerospace and Defense: Employed in flight control systems, gimbal stabilization, and missile guidance systems due to their high accuracy and reliability.

Variable Reluctance Resolver (VRR)

Characteristics:

1. Simplified Construction: VRRs differ from wound resolvers in that the rotor does not contain windings. Instead, it relies on salient poles (convexities) to modulate the magnetic flux, inducing a sinusoidal EMF in the stator windings as the rotor rotates.

2. Environmental Resilience: VRRs are highly resistant to temperature variations and harsh environments, making them suitable for applications with extreme operating conditions.

3. Cost-Effectiveness: Their simpler construction can lead to cost savings compared to wound resolvers, particularly in large-scale productions.

4. Direct Position Sensing: VRRs provide a direct measure of angular position through the modulation of magnetic flux, eliminating the need for complex demodulation circuits in some applications.

Application Areas:

1. Heavy Industry: Used in mining equipment, construction machinery, and large-scale automation systems where durability and cost-effectiveness are crucial.

2. Transportation Systems: Found in railway systems, tramways, and other transportation applications where high reliability and resistance to environmental factors are required.

3. Renewable Energy: Employed in wind turbines and solar tracking systems, where precision positioning is necessary under varying weather conditions.

In summary, both wound resolvers and variable reluctance resolvers offer unique advantages tailored to specific application needs. Wound resolvers excel in precision and durability, while VRRs offer a cost-effective and environmentally resilient solution. The choice between the two often depends on the specific requirements of the application, including precision, cost, and environmental factors.