Jump Script Doesn't Affect my Player

Hello Everyone! I've run into trouble when it comes to programming and I have to admit that I'm kind of new to the programming community but I'm learning! Anyway, I wanted to code a jumping function to my player in Unity but nothing seems to work, I've circled around this problem for two days now and It's driving me crazy. I can't find the problem within the code. I've tried multiple scripts provided by people on this site, youtube and other pages but nothing seem to affect. When I press spacebar nothing happens and something needs to be wrong with the code i'm writing. As of right now I'm using a simple code I found recently but of course it does not work like the others. If you guys could look at it and perhaps spot the problem and correct me I would be more than happy to listen to your thoughts!

Here is my PlayerController code, I also have a PlayerMotor attached to this script and I don't know if I should write my code in that instead of this, but I don't think so! Also a side note that my player is not a simple cube. It's a 3D model from blender with a armature and all that. Hopefully that would help you understand my situation.

using UnityEngine;

[RequireComponent(typeof(Animator))] [RequireComponent(typeof(PlayerMotor))] [RequireComponent(typeof(Rigidbody))] public class PlayerController : MonoBehaviour {

 [SerializeField]
 private float speed = 5f;
 [SerializeField]
 private float lookSensitivity = 3f;
 private int forceConst = 50;

 //Component caching
 private PlayerMotor motor;
 private Animator animator;
 private Rigidbody rig;
 private bool canJump;

 void Start()
 {
     motor = GetComponent<PlayerMotor>();
     animator = GetComponent<Animator>();
     rig = GetComponent<Rigidbody>();
 }

 void FixedUpdate()
 {
   if(canJump)
     {
         canJump = false;
         rig.AddForce(0, forceConst, 0, ForceMode.Impulse);
     }  
 }

 void Update()
 {
     //Jump
     if (Input.GetKeyDown(KeyCode.Space))
     {
         canJump = true;
     }

     //Calculate movement velocity as a 3D vector
     float _xMov = Input.GetAxis("Horizontal");
     float _zMov = Input.GetAxis("Vertical");

     Vector3 _movHorizontal = transform.right * _xMov;
     Vector3 _movVertical = transform.forward * _zMov;        

     //Final movement vector
     Vector3 velocity = (_movHorizontal + _movVertical) * speed;

     //Animate movement
     animator.SetFloat("Walking", _zMov);

     //Apply movement
     motor.Move(velocity);

     //Calculate roatation as a 3D vector: (turning around)
     float _yRot = Input.GetAxisRaw("Mouse X");

     Vector3 _rotation = new Vector3(0f, _yRot, 0f) * lookSensitivity;

     //Apply rotation
     motor.Rotate(_rotation);

     //Calculate camera roatation as a 3D vector: (turning around)
     float _xRot = Input.GetAxisRaw("Mouse Y");

     Vector3 _cameraRotation = new Vector3(_xRot,0f, 0f) * lookSensitivity;

     //Apply camera rotation
     motor.RotateCamera(_cameraRotation);  
 }

}

Thanks In advance