| 摘要 |
A system and method for limiting the vibration of an electric motor so as to avoid situations in which extreme vibration may result in damage to the motor or other equipment. A motor control subsystem runs the motor in accordance with a command specifying a speed or torque. A vibration sensor, such as a three-axis accelerometer, senses a vibration of the electric motor, or, alternatively, software indirectly detects the vibration based on phase or torque ripple. Such vibration may be caused by, e.g., a broken fan blade or an accumulation of snow or ice. A control element receives data regarding the vibration, determines whether the vibration exceeds a pre-determined limit, and if so, takes action to reduce the vibration of the electric motor below the pre-determined limit. Such action may involve slowing or stopping the motor, thereby avoiding damage, increasing reliability, and reducing cost. |
| 主权项 |
1. An electric motor system for limiting a vibration of an electric motor, the electric motor system comprising:
the electric motor, including a shaft configured to drive a load; a motor control subsystem configured to control operation of the electric motor, including running the electric motor in accordance with a command specifying a speed or torque at which the electric motor is to be run; a vibration sensor configured to sense a characteristic of a vibration of the electric motor; an electronic control element configured to receive data from the vibration sensor regarding the characteristic of the sensed vibration, determine whether the characteristic of the sensed vibration exceeds a pre-determined limit, and if so, reduce the speed of the electric motor to reduce the vibration of the electric motor below the pre-determined limit; and an electronic memory element configured to store the pre-determined limit used by the electronic control element. |
