# motor

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

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.5/script-reference/unityengine.md)
* **Assembly:** UnityEngine.PhysicsModule

```csharp
public JointMotor motor { get; set; }
```

### Remarks

The motor tries to reach [JointMotor.targetVelocity](/engine/6000.5/script-reference/unityengine/jointmotor/targetvelocity.md) angular velocity in degrees per second. The motor will only be able to reach `targetVelocity`, if [JointMotor.force](/engine/6000.5/script-reference/unityengine/jointmotor/force.md) is sufficiently large. If the joint is spinning faster than `targetVelocity` the motor will brake. A negative `targetVelocity` will make the motor spin in the opposite direction.

The `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 `targetVelocity` only, if [JointMotor.freeSpin](/engine/6000.5/script-reference/unityengine/jointmotor/freespin.md) is false. If `freeSpin` is true the motor will not brake.

Additional Resources: [HingeJoint.useMotor](/engine/6000.5/script-reference/unityengine/hingejoint/usemotor.md), [JointMotor](/engine/6000.5/script-reference/unityengine/jointmotor.md).

```csharp
using UnityEngine;

public class Example : MonoBehaviour
{
    void 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;
        hinge.useMotor = true;
    }
}
```

Modifying the motor does **not** automatically enable the motor.

Enabling the motor **overrides** the [HingeJoint.spring](/engine/6000.5/script-reference/unityengine/hingejoint/spring.md), given the spring was enabled. If the motor is again disabled the spring will be restored.