A motor module includes a stator formed of a main plate of a first thickness on which is mounted a rotor. The stator has at each end a receiving zone, the thickness of which is less than the first thickness.

A motor module includes a stator formed of a main plate of a first thickness on which is mounted a rotor. The stator has at each end a receiving zone, the thickness of which is less than the first thickness.

A driving device includes a driving motor, a first gear 3-1, and a gear 3-2 having a smaller diameter than the gear 3-1. Driving force from the driving motor is transmittable to a driven object when the gear 3-2 moves in an axial direction of a rotation shaft to be coupled to the gear 3-1. When the gear 3-2 moves in the axial direction to be decoupled from the gear 3-1, the driving force from the driving motor can be prevented from being transmitted to the driven object.

A driving device includes a driving motor, a first gear 3-1, and a gear 3-2 having a smaller diameter than the gear 3-1. Driving force from the driving motor is transmittable to a driven object when the gear 3-2 moves in an axial direction of a rotation shaft to be coupled to the gear 3-1. When the gear 3-2 moves in the axial direction to be decoupled from the gear 3-1, the driving force from the driving motor can be prevented from being transmitted to the driven object.

A battery powered device includes a battery and a motor controller that is coupled to the battery. A motor is operably coupled to the motor controller. The motor controller is configured to detect an amount of available power from the battery and engage the motor based on the amount of available power.

A battery powered device includes a battery and a motor controller that is coupled to the battery. A motor is operably coupled to the motor controller. The motor controller is configured to detect an amount of available power from the battery and engage the motor based on the amount of available power.

Provided are an electronic expansion valve, a control system, and a control method, including: a step motor and a Hall sensor; the step motor includes a rotor and a stator; the rotor includes a permanent magnet; the Hall sensor is provided on the outer periphery of the permanent magnet; the Hall sensor and rotor are arranged in the radial direction, and the stator and Hall sensor are arranged in the axial direction; the main-body part of the Hall sensor is used for sensing the magnetic pole change of the permanent magnet; such a structure reduces the effect that an operating environment has on the Hall sensor when detecting a signal.

Provided are an electronic expansion valve, a control system, and a control method, including: a step motor and a Hall sensor; the step motor includes a rotor and a stator; the rotor includes a permanent magnet; the Hall sensor is provided on the outer periphery of the permanent magnet; the Hall sensor and rotor are arranged in the radial direction, and the stator and Hall sensor are arranged in the axial direction; the main-body part of the Hall sensor is used for sensing the magnetic pole change of the permanent magnet; such a structure reduces the effect that an operating environment has on the Hall sensor when detecting a signal.

A linear or rotary step motor for moving an object comprising: one or more beam actuators; and one or more auxiliary actuators. Each beam actuator comprises: (a) a flexible beam; (b) two holders holding the flexible beam from the beam edges; and (c) an actuator for moving the said at least one holder in order to bent the beam toward the object or to pull the beam away from the object. The axillary actuators are connected to the one or more beam actuators. The beam actuators configured to grip or release the object, and the one or more beam actuators perform a movement step to the object by first grip the object by the one or more beam actuators then push the object by activating the auxiliary actuator.

A linear or rotary step motor for moving an object comprising: one or more beam actuators; and one or more auxiliary actuators. Each beam actuator comprises: (a) a flexible beam; (b) two holders holding the flexible beam from the beam edges; and (c) an actuator for moving the said at least one holder in order to bent the beam toward the object or to pull the beam away from the object. The axillary actuators are connected to the one or more beam actuators. The beam actuators configured to grip or release the object, and the one or more beam actuators perform a movement step to the object by first grip the object by the one or more beam actuators then push the object by activating the auxiliary actuator.