Limiting distance between two objects and enemy movement

Hey I need help with enemy movement and limiting the distance between the enemy and player.
For more information read the comments in the script.

Code (CSharp):

1. public Transform playerpos;
2.     public Rigidbody rbenemy;
3.     public float enemymovespeed;
4.     public float maxdistance;
5.     public float distance;
6.    
7.  
8.     void Start()
9.     {
10.         DataManagerS.currentenemylvl += 1;
11.         playerpos = GameObject.Find("Player").GetComponent<Transform>();
12.     }
13.  
14.     private void Update()
15.     {
16.         distance = Vector3.Distance(transform.position, playerpos.position);
17.         if (distance > maxdistance) //now move towards the player
18.         {
19.             rbenemy.AddForce(transform.forward * enemymovespeed, ForceMode.Impulse);
20.             //is there a better way to do this, cus like this the enemy just flies away the player and takes ages to come back
21.         }
22.         else
23.         {
24.             distance = maxdistance;
25.             //now limit the distance
26.         }
27.         //used to move to the player
28.         transform.LookAt(playerpos.position);
29.     }
30.  
31.     private void OnCollisionEnter(Collision collision)
32.     {
33.         if (collision.gameObject.tag == ("Player"))
34.         {   //killing the player
35.             PlayerMovementS.Health -= 1f;
36.         }
37.     }
38.     private void OnDestroy()
39.     {
40.         DataManagerS.Enemyskilled += 1;
41.     }

 

You should only be applying physics forces inside FixedUpdate, not Update. That may explain why you're getting inconsistent speeds.

What other actual issues are you having?