Motor bearing system
AssigneeMazda Motor Corporation
InventorsYuma Miyauchi, Runa Suzuki
Life of this patent
Estimating the term…
Abstract
A motor bearing system has: a slide bearing operable as a gas-lubricated bearing by gas supplied from a pump; a rolling bearing; a switching mechanism switching between the slide bearing and the rolling bearing; and a controller. When a motor rotation speed is lower than a first speed, the controller controls the switching mechanism to apply the rolling bearing. When the motor rotation speed is equal to or higher than the first speed and lower than a second speed, the controller controls the switching mechanism to apply the slide bearing and controls the pump to operate the slide bearing as a gas-lubricated bearing. When the motor rotation speed is equal to or higher than the second speed, the controller controls the switching mechanism to apply the slide bearing and stops the pump.
Claims19
A motor bearing system comprising:
- a rolling bearing that supports a rotary shaft of a motor;
- a slide bearing that is arranged in parallel with the rolling bearing on an axis of the rotary shaft to support the rotary shaft, the slide bearing being operable as a gas-lubricated bearing that achieves gaseous lubrication with gas supplied to the slide bearing;
- a pump that supplies the gas to the slide bearing;
- a switching structure to set one of a first state and a second state, in the first state, the rolling bearing functioning as a bearing that supports the rotary shaft and the slide bearing not functioning as the bearing that supports the rotary shaft, and in the second state, the slide bearing functioning as the bearing that supports the rotary shaft and the rolling bearing not functioning as the bearing that supports the rotary shaft;
- a detector configured to detect a rotation speed of the motor;
- and
- controller circuitry that is configured to control the pump and the switching structure on a basis of the rotation speed that is detected by the detector, wherein
- the controller circuitry is configured to
- set the switching structure in the first state when the rotation speed is lower than a first speed,
- set the switching structure in the second state, and control the pump to operate the slide bearing as the gas-lubricated bearing when the rotation speed is equal to or higher than the first speed and is lower than a second speed that is higher than the first speed, and
- set the switching structure in the second state and stop the pump when the rotation speed is equal to or higher than the second speed.
A motor bearing system comprising:
- a bearing that supports a rotary shaft of a motor, the bearing being operated as a rolling bearing that includes a plurality of rolling elements or a gas-lubricated bearing that achieves gaseous lubrication with gas supplied to the bearing;
- a pump that supplies the gas to the gas-lubricated bearing;
- a detector configured to detect a rotation speed of the motor;
- and
- controller circuitry that is configured to control the pump on the basis of the rotation speed that is detected by the detector, wherein
- the controller circuitry is configured to
- stop the pump or reduce a driving force of the pump at a time when the rotation speed is equal to or higher than a first speed, so as to operate the bearing as the rolling bearing in a case where the rotation speed is lower than the first speed,
- control the pump to operate the bearing as the gas-lubricated bearing when the rotation speed is equal to or higher than the first speed and is lower than a second speed that is higher than the first speed, and
- stop the pump when the rotation speed is equal to or higher than the second speed.
Dependencies are inferred from the claim text.