[FIXED] Changing the Target Velocity of a Hinge Joint Motor in script

I'm trying to get a Rigidbody to turn itself as it moves around a point by using a hinge joint motor. The only value I need to affect is the Target Velocity. When I initially tried this, I got an error telling me to store hingejoint.motor.targetvelocity as a temporary variable before altering it and reassigning it (getting it and setting it;) however, now that I've done that, I get no errors, but the target velocity remains how it was set before runtime. Here's my code:

 using UnityEngine;
 using System.Collections;
 
 public class MerryGoRound : MonoBehaviour {
 
     public GameObject funnel;
     public float turnSpeed = 1f;
 
     HingeJoint joint;
     JointMotor motor;
 
     void Start () {
         joint = GetComponent<HingeJoint>();
         motor = joint.motor;
     }
     
     void FixedUpdate () {
         Vector3 line1 = funnel.transform.position - transform.position;
         Vector3 line2 = (funnel.transform.position + new Vector3(0f, 10f, 0f)) - transform.position;
         Vector3 perp = Vector3.Cross(line1, line2);
         Vector3 wheelForwardVector = transform.forward;
 
         float tempTargetVelocity = motor.targetVelocity;
         tempTargetVelocity = Vector3.Angle(wheelForwardVector, perp) * turnSpeed;
         motor.targetVelocity = tempTargetVelocity;
     }
 }