Stator position adjustment method, motor drive device and stator position adjustment system

A stator position adjustment method for a motor drive device that includes a motor case, a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case, and a stator disposed at an outer circumference of the rotor concentrically with the rotor and having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis, the method comprising:

• setting a first tolerance range as a maximum tolerance range of a stator axis with respect to a motor case axis set for the motor case in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case;
• setting a second tolerance range as a maximum tolerance range of the stator axis in which a second gap is formed between an inner circumference surface of the stator and an outer circumference surface of the rotor, the first tolerance range being set less than or equal to the second tolerance range;
• measuring a position of the stator axis;
• and
• adjusting the position of the stator axis with respect to the motor case axis set within the first tolerance range based on a measured position of the stator axis.

A motor drive device comprising:

• a motor case;
• a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case;
• and
• a stator disposed at an outer circumference of the rotor concentrically with the rotor, wherein:
• the motor drive device having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis,
• a stator axis being adjusted to a position within a first tolerance range as a maximum tolerance range of the stator axis in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case throughout an entire circumference of the stator,
• the stator includes a protruding section formed on the outer circumference surface protruding outward in a radial direction in a plurality of areas in a circumferential direction,
• the motor case includes a seat surface on which the protruding section is seated, and
• regarding an ordinary outer circumference section excluding the protruding section in the circumferential direction of the stator, a shaft direction gap is formed between the ordinary outer circumference section and the motor case.

A motor drive device comprising:

• a motor case;
• a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case;
• and
• a stator disposed at an outer circumference of the rotor concentrically with the rotor;
• wherein:
• the motor drive device having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis,
• the motor drive device being set with a first tolerance range as a maximum tolerance range of a stator axis in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case and a second tolerance range as a maximum tolerance range of the stator axis in which a second gap is formed between an inner circumference surface of the stator and an outer circumference surface of the rotor,
• the first tolerance range being set less than or equal to the second tolerance range,
• the stator axis being adjusted to a position within the first tolerance range, the stator includes a protruding section formed on the outer circumference surface protruding outward in a radial direction in a plurality of areas in a circumferential direction,
• the motor case includes a seat surface on which the protruding section is seated, and
• regarding an ordinary outer circumference section excluding the protruding section in the circumferential direction of the stator, a shaft direction gap is formed between the ordinary outer circumference section and the motor case.

A stator position adjustment system for a motor drive device that includes a motor case, a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case, and a stator disposed at an outer circumference of the rotor concentrically with the rotor and having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis, the system comprising:

• a storage unit that stores a first tolerance range as a maximum tolerance range of a stator axis with respect to a motor case axis set for the motor case in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case;
• a measurement unit that measures a position of the stator axis;
• an adjustment unit that adjusts the position of the stator axis;
• and
• a controller that generates an adjustment command with respect to the adjustment unit to adjust the position of the stator axis with respect to the motor case axis set within the first tolerance range based on the position of the stator axis measured by the measurement unit.

A stator position adjustment system for a motor drive that includes a motor case, a rotor shaft supported by the motor case in order to rotate a rotor inside the motor case, and a stator disposed at an outer circumference of the rotor concentrically with the rotor and having a configuration in which the stator is tightened and secured to the motor case by a tightening unit that tightens the stator along a rotor axis, the system comprising:

• a storage unit that stores a first tolerance range as a maximum tolerance range of a stator axis with respect to a motor case axis set for the motor case in which a first gap is formed between an outer circumference surface of the stator and an inner circumference surface of the motor case, and that stores a second tolerance range as a maximum tolerance range of the stator axis in which a second gap is formed between an inner circumference surface of the stator and an outer circumference surface of the rotor with the first tolerance range being set less than or equal to the second tolerance range;
• a measurement unit that measures a position of the stator axis;
• an adjustment unit that adjusts the position of the stator axis;
• and
• a controller that generates an adjustment command with respect to the adjustment unit to adjust the position of the stator axis with respect to the motor case axis set within the first tolerance range based on the position of the stator axis measured by the measurement unit.