Compact motor mount for information storage devices

A drive for an information storage device having a moveable storage medium and a head associated therewith to permit information to be stored on and retrieved from the storage medium, said drive comprising:

• a base plate including a planar layer of ferromagnetic material having a printed circuit board affixed to one side thereof;
• and
• a motor supported by said base plate, said motor including a stator coil assembly mounted on the outer surface of said printed circuit board and a shaft rotatably mounted on said base plate, said shaft having a first end portion extending from said printed circuit board generally at a right angle thereto adjacent the stator coil assembly and a second end portion extending from said ferromagnetic layer generally at a right angle thereto for operative engagement with the information storage device to allow the head to store information on and retrieve information from the storage medium, said motor further including a permanent magnet rotor attached to the first end portion of said shaft, said rotor providing a stray flux return path from said stator coil assembly to said base plate via a first air gap between said stator coil assembly and said rotor and a second air gap between said rotor and said base plate to provide at least some shielding of the storage medium from stray electromagnetic interference emitted from the stator coil assembly.

A drive for an information storage device having a moveable storage medium and a head associated therewith to permit information to be stored on and retrieved from the storage medium, said drive comprising:

• a base plate including a planar layer of ferromagnetic material having a printed circuit board affixed to one side thereof;
• and
• a motor supported by said base plate, said motor including a stator coil assembly mounted on the outer surface of said printed circuit board and a shaft rotatably mounted on said base plate, said shaft having a first end portion extending from said printed circuit board generally at a right angle thereto adjacent the stator coil assembly and a second end portion extending from said ferromagnetic layer generally at a right angle thereto for operative engagement with the information storage device to allow the head to store information on and retrieve information from the storage medium, said motor further including a cup-shaped permanent magnet rotor attached to the first end portion of said shaft, said rotor having a rim disposed at its outer periphery which extends towards said base plate to substantially enclose said stator coil assembly within the space defined by said rotor and said base plate and provide at least some shielding of the storage medium from stray electromagnetic interference emitted from the stator coil assembly.