Control system
A control system includes: a motor including (i) a rotor, connected to an output shaft of an engine, and (ii) a stator that is movable in an axial direction of the rotor, a moving member connected to the stator, a coil wound around the moving member, and a movement control part that changes an overlap amount of the rotor and the stator in the axial direction, by moving the stator in the axial direction of the rotor by causing a power source to apply a voltage to the coil.
1 . A control system comprising:
a motor includes a rotor connected to an output shaft of an engine, and a stator that generates a magnetic field for rotating the rotor;
a movement control part that changes an overlap amount of the stator and the rotor in the axial direction, by moving the stator in an axial direction of the rotor;
a moving member that is connected to the stator and movable in the axial direction together with the stator; and
a coil wound around the moving member,
wherein by causing a power source, that applies a voltage to the coil, to apply the voltage to the coil, the movement control part changes the overlap amount of the stator and the rotor in the axial direction by moving the stator in the axial direction.
2 . The control system according to claim 1 , further comprising:
an elastic member that applies a force to the stator in the axial direction,
wherein the movement control part moves the stator in the axial direction with a force greater than the force applied to the stator by the elastic member, by causing the power source to apply a voltage to the coil.
3 . The control system according to claim 2 , wherein
the elastic member reduces the overlap amount by applying a force to the stator in a direction in which the stator moves away from the rotor in the axial direction, and
the movement control part moves the stator in a direction in which the stator approaches the rotor in the axial direction, by causing the power source to apply a voltage to the coil, and increases the overlap amount.
4 . The control system according to claim 3 , further comprising:
a first holding member that is provided opposite to the stator when viewed from the moving member in the axial direction and holds the elastic member, wherein
the elastic member is connected to the moving member and the first holding member.
5 . The control system according to claim 4 , wherein the elastic member reduces the overlap amount by applying a force to the stator and the moving member in a direction in which the stator and the moving member are pulled toward the first holding member in the axial direction, to pull out the stator from the rotor.
6 . The control system according to claim 5 , wherein by causing the power source to apply a voltage to the coil, the movement control part moves the stator in a direction in which the stator approaches the rotor in the axial direction by generating a Lorentz force which is greater than the force applied to the stator by the elastic member, and increases the overlap amount.
7 . The control system according to claim 5 , wherein
the first holding member is formed of permanent magnets,
the moving member is formed of magnetic materials other than the permanent magnets, and
by causing the power source to apply a voltage to the coil, the movement control part turns the moving member into an electromagnet that generates a magnetic repulsion force by which the moving member is repelled from the first holding member.
8 . The control system according to claim 1 , further comprising:
a second holding member that holds the stator in a state in which the overlap amount becomes equal to or less than a first threshold value at which the motor ceases to generate electric power even when the rotor rotates, and holds the stator in a state in which the overlap amount becomes equal to or greater than a second threshold value which is greater than the first threshold value.
9 . The control system according to claim 1 , wherein
the stator is provided in the rotor to be able to move in a sliding manner, and
the moving member is connected to the stator on the opposite side of the rotor across the stator.
10 . The control system according to claim 1 , wherein the movement control part:
causes the stator to generate a force that moves the stator in a direction in which the stator approaches the rotor in the axial direction, by causing the power source to apply a first voltage to the coil, and
causes the stator to generate a force that moves the stator in a direction in which the stator moves away from the rotor in the axial direction, by causing the power source to apply a second voltage having a polarity opposite to the first voltage.
11 . The control system according to claim 1 , wherein the movement control part moves the stator in the axial direction such that the overlap amount of the stator and the rotor in a case where the motor is not driven becomes smaller than the overlap amount of the stator and the rotor in the axial direction in a case where the motor is driven.