HingeJoint.motor

Description

The motor will apply a force up to a maximum force to achieve the target velocity in degrees per second.

The motor tries to reach motor.targetVelocity angular velocity in degrees per second. The motor will only be able to reach motor.targetVelocity, if motor.force is sufficiently large. If the joint is spinning faster than motor.targetVelocity the motor will break. A negative motor.targetVelocity will make the motor spin in the opposite direction.

The motor.force is the maximum torque the motor can exert. If it is zero the motor is disabled.

The motor will brake when it is spinning faster than motor.targetVelocity only, if motor.freeSpin is false. If motor.freeSpin is true the motor will not brake.

function Start() {
	var hinge = GetComponent.<HingeJoint>();
	
	// Make the hinge motor rotate with 90 degrees per second and a strong force.
	var motor = hinge.motor;
	motor.force = 100;
	motor.targetVelocity = 90;
	motor.freeSpin = false;
	hinge.motor = motor;
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Start() {
        HingeJoint hinge = GetComponent<HingeJoint>();
        JointMotor motor = hinge.motor;
        motor.force = 100;
        motor.targetVelocity = 90;
        motor.freeSpin = false;
        hinge.motor = motor;
    }
}

Modifying the motor automatically enables the motor by setting HingeJoint.useMotor to true.