Air compressor and blower

A compressor or blower comprising:

• an impeller disposed on a high-speed shaft;
• a motor shaft that extends from an end shield of a motor;
• a gearbox disposed between the motor and the impeller, the gearbox including:
• a pinion disposed on the high-speed shaft;
• and
• a bull gear disposed directly on the motor shaft in engagement with the pinion;
• a lubrication system with a single pump module comprising:
• an injector configured to wet bearings on the high-speed shaft prior to starting the motor;
• and
• a mechanically driven pump that is disposed on the motor shaft and configured to mechanically pump oil to the bearings during operation of the motor;
• a sensor adapted to monitor lubrication at the bearings;
• and
• a controller operably coupled to the sensor and configured to execute computer readable instructions stored in a memory to:
• at startup of the motor, cause the injector to wet the bearings until a pressure detected by the sensor at the bearings reaches a first pressure threshold that indicates the bearings are wet;
• and/or
• at shutdown of the motor, cause the injector to wet the bearings to maintain the pressure detected by the sensor at or above a second pressure threshold for a predetermined amount of time.

A lubrication system for a compressor or blower, the lubrication system comprising:

• an injector configured to wet a bearing on a shaft of the compressor or blower prior to starting a motor of the compressor or blower, the shaft being configured to drive rotation of an impeller during operation of the motor;
• a mechanically driven pump configured to mechanically pump oil to the bearing during operation of the motor;
• and
• a sensor configured to monitor lubrication at the bearing.