ソースコード

using UnityEngine;

[DisallowMultipleComponent]
public sealed class Example : MonoBehaviour
{
    [SerializeField] private float m_maxRotationSpeed;

    private void FixedUpdate()
    {
        var rigidbody2D = GetComponent<Rigidbody2D>();

        rigidbody2D.angularVelocity = Mathf.Clamp
        (
            value: rigidbody2D.angularVelocity,
            min: -m_maxRotationSpeed,
            max: m_maxRotationSpeed
        );
    }
}