Unlock instant, AI-driven research and patent intelligence for your innovation.

Motor drive circuit and method of driving a motor

A drive system, brushed DC motor technology, applied in the control of generators, motor control, motor generator control, etc., can solve the problems of coil back electromotive force increase and limitation, and achieve the effect of high operating temperature

Active Publication Date: 2016-01-20
TRW LIMITED
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the rotor speed increases, the back EMF generated in the coil also increases
This limits the torque that can be produced

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Motor drive circuit and method of driving a motor
  • Motor drive circuit and method of driving a motor
  • Motor drive circuit and method of driving a motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] Referring to FIG. 1 , a drive system according to an embodiment of the invention comprises a drive circuit 8 arranged to draw power from a direct current source 10 , in this example a vehicle battery, via a wiring harness 12 represented as resistors Rh1 and Rh2 . . The drive circuit 8 uses this electric power to drive a three-phase AC permanent magnet motor 14 connected to a mechanical load 15 which in this example is the output shaft of the EPS system. The motor 14 is conventional and includes three motor windings connected in a star network, usually labeled phase a, phase b and phase c, but there may be more than three phases and the three or more phases may be connected into alternative topologies such as delta configurations. One end of each winding is connected to a respective corresponding terminal 16a, 16b, 16c. The other ends of the windings are connected to form a starcenter.

[0065] The drive circuit 8 includes switching means in the form of an inverter 18...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A drive system for a brushless DC motor having a rotor including at least one permanent magnet and a stator including at least one phase winding, the system comprising a drive circuit including switch means associated with the winding for varying the current passing through the winding; rotor position sensing means arranged to sense the position of the rotor; and control means arranged to provide drive signals to control the switch means; the drive system further being arranged to receive a temperature signal that has a value dependent upon the temperature of the at least one magnet of the rotor, characterised in that the control means is arranged to vary the phase of the current passing through the winding relative to the rotor position dependent upon the temperature of the rotor magnet.

Description

technical field [0001] The present invention relates to motor control circuits, and methods of controlling multi-phase motors. Background technique [0002] Electric motors are becoming more and more common in a wide range of applications. For example, it is known to provide such a system comprising an input shaft, an output shaft, a torque sensor adapted to measure the torque in the input shaft, and a torque sensor adapted to convert the auxiliary torque in dependence on the torque measured by the torque sensor Electric Power Steering (EPS) of an electric motor applied to the output shaft. [0003] A typical permanent magnet motor includes, for example, a magnetic rotor including a permanent magnet, and a stator including multiple phase windings on a yoke. Applying a suitable voltage to each of the phase windings enables current to flow through the windings, creating a current flux vector in the air gap between the stator and rotor. This flux interacts with the magnetic ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/00H02P21/00
CPCH02P21/0089H02P29/662H02P21/22H02P6/153H02P6/15H02P21/0085
Inventor G·A·R·坎普
Owner TRW LIMITED