Hitachi Uni-Torque Motor free download

File name Hitachi (1977)-Unitorque-Motor-Service-Manual.pdf

SERUICE IUIA]IUAI No.127 Contents 1. Outline of development . . . I 2. Features I 3. Comparisons with other types of motors 2 4.Operatingprinciple ...2 5.Uni-torque... ...4 6. Servo control circuit . 5 7. Specifications.. 8 * Wow/flutter * Load characteristics * S/N ratio * Start-up characteristics * Time characteristics * Temperature characteristics 8. Circuit diagram . .. . l0 Output axis (record guide) 1. Outline of development Cover The signal-to-noise ratio, wow/flutter and other Rotor magnet (B-Pole) important characteristics of turntable which employ direct drive motor directly rely on the performance detection of the motor. This is because the platter and the base board Drive coils (2) motor are coupled directly. Conventionally, multi-pole DC servomotors or cup type AC servomotors have been available for direct drive switching use Ball turntables, but each type has its merits and demerits. Hitachi set out to develop a high-performance direct Fig. 1 Construction of main uni-torque motor unit drive motor which combines the merits of both systems, and the result of its endeavors was the flat, commutator- the platter does not rotate smoothly), and the output less DC servomotor. (A total of 15 patents have been torque is constant so that there is very little vibration applied