Motor-Driven Timers
When a process has a definite on and off operation, or a sequence of successive operations, a motor-driven timer is generally used (Figure 7– 10 and Figure 7– 11). A typical application of a motor-driven timer is to con- trol laundry washers where the loaded motor is run for a given period in one direction, reversed, and then run in the opposite direction.
Generally, this type of timer consists of a small, synchronous motor driving a cam-dial assembly on a common shaft. A motor-driven timer successively closes and opens switch contacts, which are wired in circuits to energize control relays or contactors to achieve desired operations.
Related posts:
Electrical DC Servo Motors:Types of Power Unit
Zener Diodes:Zener Diode Characteristics
Components of Brushless DC Motors
Measurement:Combining Voltage
Multicore Cables and Cabletray:Cable Tray Installations
Identifying Unmarked Leads in a Nine-Lead Three-Phase Motor
AUDIO ELECTRONICS:SPECIAL SOUND APPLICATIONS
INDUSTRIAL PROCESS CONTROLLERS:SMC (SERVO MOTION CONTROL) CONTROLLERS
Single-phase motors:Repulsion Induction Motor
Inductance:l/r time constants
INTRODUCTION TO CONVENTIONAL D.C. MOTORS
Communications – Internet
Strain and pressure:Fibre optic methods
TESTING OF DC MACHINES