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Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
where f X (x) is the probability density function of X . See central absolute moment, absolute moment. expectation. central processing unit (CPU) a part of a computer that performs the actual data processing operations and controls the whole computing system. It is subdivided into two major parts: 1. The arithmetic and logic unit (ALU), which performs all arithmetic, logic, and other processing operations, 2. The control unit (CU), which sequences the order of execution of instructions, fetches the instructions from memory, decodes the instructions, and issues control signals to all other parts of the computing system. These control signals activate the operations performed by the system. centralized arbitration a bus arbitration scheme in which a central bus arbiter (typically housed in the CPU) accepts requests for and gives grants to any connected device, wishing to transmit data on the bus. The connected devices typically have different priorities for bus access, so if more than one device wants bus access simultaneously, the one with the highest priority will get it first. This prioritization is handled by the bus arbiter. centrifugal switch a speed-sensitive switch operated by centrifugal force, mounted on the shaft of a motor, used to perform a circuit switching function. Used in single-phase induction motors to disconnect the starting winding when the motor approaches operating speed.
D-C and Single-Phase Motors
Published in Don Renner, Hands-On Water/Wastewater Equipment Maintenance, 2017
5.66 The starting windings of a capacitor start motor are smaller than the running windings but have more turns than a regular split-phase motor. The capacitor is connected in series with the starting windings (Figure 5.20). When the motor is started, both the running and starting windings are energized, but the capacitor shifts the current ahead of the voltage in the starting windings to improve the starting torque. After the motor has reached approximately 75 percent of its rated speed, the centrifugal switch opens, disconnecting the starting windings, and the motor operates on the running windings.
Design and Performance Analysis of Single Phase Line Start Synchronous Reluctance Motor Derived from Single Phase Induction Motor
Published in Smart Science, 2023
Mandar Chaudhari, Anandita Chowdhury
The stator of LS‐SynRM is the same as that of conventional SPIM. The main and auxiliary windings are displaced by 90° in space. Two capacitors, starting and running capacitors, are connected in the circuit. The starting capacitor is connected in series with auxiliary winding through a centrifugal switch for the starting purpose to start the machine direct online. The run capacitor, having less value than the starting capacitor, is left in the auxiliary winding for better performance.