US 5,767,635 A · Displacement machine with electronic motor synchronization

Abstract

In a displacement machine for compressible media having at least two rotors (14a-c) which are configured as profiled bodies and whose profiles engage with one another in the manner of gearwheels during rotation, the individual rotors are respectively driven by their own electric motors (9a-c) and are kept synchronous in rotational speed and angular position by electronic closed-loop and/or open-loop control units (1; 25a-c) in accordance with the transmission ratio of the displacer unit stage. The electronics can be employed for monitoring further operating data of the pump and also for matching the pump output by changing rotational speed. It can also be used as an overload protection. The rotational speeds and rotational attitudes of the rotors are controlled individually and independently of one another, the required attitude values being specified to the individual control units (25a-c) by means of a main control unit (1).

Claims21

Dependent claims

An improved displacement machine for compressible media of the type in which first and second rotors are respectively driven by first and second drive motors such that the first and second rotors are unobstructively synchronized with one another during coordinated motion thereof whereby the rotors do not normally contact one another, in which the angular position and rotational speed of each of the first and second drive motors is independently controlled by an associated drive control unit and an associated electronic control system, and in which each of the electronic control systems receive predetermined control values from a centralized main control unit, wherein the improvement comprises:

a starting-torque pulse generator associated with each of the electronic control systems, said pulse generator repeatedly transmitting torque pulses of predetermined magnitudes at predetermined intervals to the first and second drive motors to initiate rotation thereof whereby the first and second rotors initiate synchronized coordinated motion.

A method of controlling a displacement machine having first and second rotors which are respectively connected to first and second drive motors for rotation therewith such that the first and second rotors are unobstructively synchronized with one another during coordinated motion thereof whereby the rotors do not normally contact one another, the displacement machine also having a drive control unit and an electronic control system associated with each of the first and second drive motors to independently control the angular position and rotational speed of the first and second drive motors, the displacement machine further having a centralized main control unit which is connected to each of the electronic control systems for transfer of information therebetween, said method comprising the steps of:

transmitting position data from the centralized main control unit to each of the electronic control systems;
creating rotational speed data from the position data after reception thereof by the electronic control systems;
delivering starting-torque pulses of predetermined magnitudes at predetermined intervals from each drive control unit to its associated drive motor to initiate rotation of the first and second rotors such that the rotors are unobstructively synchronized with one another during coordinated motion thereof whereby the rotors do not normally contact one another;
delivering subsequent torque pulses from each drive control unit to its associated drive motor of a magnitude and interval determined by the attitude values such that the first and second rotors are unobstructively synchronized with one another during coordinated motion thereof whereby the rotors do not normally contact one another.

1 more element

Dependencies are inferred from the claim text.

Displacement machine with electronic motor synchronization

Life of this patent

Displacement machine with electronic motor synchronization

Life of this patent

Abstract

Claims21