Abstract:
The disclosed vacuum assembly can be mounted in a vehicle. The motor/fan assembly is positioned above a chassis wall. Lateral flanges on opposed sides of the tank support the tank in generally horizontal sliding motion from a forward position to an elevated rearward position. A rear flange supports the tank as it pivots to a mounted position in which an inlet on a removable lid on the tank communicates with a hose, and an outlet on the lid communicates with the motor/fan assembly. In a removed position, the inlet and outlet are disconnected. Alignment bosses fit in aligned openings when the tank is in the mounted position.
Abstract:
A discrete rotor position estimation method for a synchronized reluctance motor is provided. A d.c.-link voltage V dc and a phase current I ph are sensed. A flux-linkage λ ph of an active phase is calculated from the sensed d.c.-link voltage V dc and the sensed phase current I ph . The calculated flux-linkage λ ph is compared with a reference flux-linkage λ r . The reference flux-linkage λ r corresponds to a reference angle θ r which lies between angles corresponding to aligned rotor position and non-aligned rotor position in the synchronized reluctance motor. An estimated rotor position θ cal is obtained only once when the calculated flux-linkage λ ph is greater than the reference flux-linkage λ r .
Abstract:
A power converter for a switched reluctance motor (SRM) or a permanent magnet brushless direct current (dc) motor (PMBDCM) that includes a front-end boost partial circuit (551) for connecting with a first phase winding of the motor (552) to form a front-end boost circuit (553) and a back-end boost partial circuit (554) for connecting with a second phase winding of the motor (555) to form a back-end boost circuit (554). The front-end boost partial circuit (551) generates a first step-up voltage in cooperation with the inductance provided by the first phase winding (552). The back-end boost partial circuit (554) generates a second step-up voltage in cooperation with the inductance provided by the second phase winding (555).
Abstract:
Es wird ein elektronisch kommutierter Motor vorgeschlagen, der eine induktive und/oder Kapazitive Rotorpositionsermittlung enthält, die eine Fläche erfasst, an der sich Stator- und Rotorpole (10-15; 17-20) gegenüberstehen. Bei der Positionsermittlung ist die gesamte Fläche berücksichtigt. Die Polwinkel (β S , β R ) von Stator- und Rotorpolen (10-15; 17-20) sind jeweils auf Werte festgelegt, bei denen eine Rotordrehung eine Flächenänderung ergibt.
Abstract:
The invention relates to a control circuit for a reluctance machine having two mutually movable parts and at least one inductive phase winding (WA, WB, WC) adapted for a certain maximum drive current value. The method comprises the steps of: detecting when a phase winding is in a non-drive mode; causing a test current, having a second maximum value lower than said certain maximum value, to flow through the phase winding (WA, WB, WC) and through a current sensor (S3A) when the winding is in the non-drive mode; and establishing a mutual position in dependence of the output of said current sensor (S3A).
Abstract:
The invention relates to a reluctance motor (1) having a rotor (3) and a stator (2). The stator (2) has individual stator coils (6), and a predefined current (I) flows in one of the coils (6), in accordance with the engine (1) load. The invention aims to achieve adequate precision in determining the rotor position with simple and inexpensive measuring methods. To this end, the predefined current (I) is obtained by applying a constant voltage (U), and the time (t1, t2) necessary to reach the maximum current value (I Max) when applying this constant voltage (U) is measured, giving the value of the engine (1) load.
Abstract:
A control for operating an inverter coupled to a switched reluctance machine includes a relative angle estimation circuit for estimating rotor angle for a phase in the switched reluctance machine. The relative angle estimation circuit estimates a phase voltage and thereby calculates phase flux linkage to estimate the rotor angle.
Abstract:
This motor has a special magnetic circuit which enables it to be powered by a very simple electronic circuitry. This motor has, according to the figure, four U-shaped Yokes (11, 112) with eight unevenly spaced poles (111) surrounding a rotating six-pole rotor (12). The motor is driven by two power semiconductor devices (21) controlled from a Hall sensor (31). The demagnetising energy being set free by switching off the main windings (112X) will be directed through the coupling diodes (22) as premagnetising energy to the secondary windings (113Y) of the following phase (Y). This motor with high speed capability which is inexpensive, simple and quietly running can be mainly used for pumps, fans and blowers for gases and fluids.