Types of Motor Mountsby Emily Beach
The motor mount acts as a transition between the motor and the surrounding components, and allows installers to secure the motor within the device. The right motor mount can extend the life of the device while the wrong mount may result in excess vibration and a shortened lifespan for the engine. When choosing motor mounts, take the time to match the type of mount with the application in order to maximize its performance.
In a rigid mount, the motor mount is attached to the frame of the device with fasteners or bolts. Some rigid mounts may even be built into the vehicle or equipment, or permanently welded in place. According to "Electrical Construction and Maintenance" magazine, rigid mounts are most often used with small motors rather than large ones. Rigid mounts provide the most accurate alignment between the motor and the surrounding mechanisms, but may be damaged by vibration under heavy-duty operation.
Resilient motor mounts feature a layer of rubber or insulation between the mount and the motor. This material helps to reduce noise and vibration, which may extend the life of the motor and related parts. Resilient motor mounts also allow for some flexibility and movement without compromising the performance of the motor. According to "Electrical Construction and Maintenance" magazine, these mounts are often found in larger motors or in applications where excess noise or vibration could be problematic. These mounts also help to reduce the impact as the motor starts and stops, which minimizes shock to the surrounding system.
Hydraulic, or hydro motor, mounts contain some form of gel or liquid to help absorb impact and vibration during operation. This may include glycol or hydraulic fluid, or any other types of fluid substance. This type of mount is often used in four-cylinder motors, which produce large amounts of vibration or noise. They may also be used with other types of motors when noise levels must be kept to a minimum.
In a motor designed for face mounting, or NEMA "C" mounting, the motor attaches directly to the surrounding components without the use of a standard mount. Often, installers will use a NEMA "C" face mount adapter in order to adapt a face-mounted motor to a vehicle designed for another type of motor mount. In this type of mount, the bolts on the motor pass right through pre-drilled holes in the motor casing and into the surrounding components or devices.
- motor image by Petr Efremov from Fotolia.com