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A control device

A control device, pulse width modulation technology, applied in the direction of control of electromechanical transmission, control drive, control system, etc., can solve the problem of indeterminate current sensor reading, incorrect, abnormal current sensor operation, etc.

Active Publication Date: 2019-07-16
PROTEAN ELECTRIC LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the sum of the measured currents is not zero, it can be concluded that at least one current sensor is not functioning properly
However, knowing that the sum of the measured currents is non-zero does not in itself determine which current sensor is reading incorrectly

Method used

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Examples

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Embodiment Construction

[0022] The described embodiments of the invention are directed to a control device for an electric motor used in a vehicle wheel. However, the electric motor can be used for any purpose and, when located in the vehicle, can be located anywhere within the vehicle. The electric motor is of the type having a set of coils mounted to the vehicle as part of a stator radially surrounded by a rotor mounted to the wheel carrying a set of magnets. Furthermore, some aspects of the invention are applicable to arrangements in which the rotor is mounted centrally within radially surrounding coils. As will be appreciated by those skilled in the art, the present invention is also applicable for use with other types of electric motors.

[0023] For the purposes of this example, if figure 1 As shown, the in-wheel motor includes a stator 252 including a heat sink 253, a plurality of coils 254 and an electronics module 255 mounted at the rear of the stator for driving the coils. Coils 254 are ...

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PUM

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Abstract

An electric motor has a first set of coil windings arranged to form a first sub motor and a second set of coil windings arranged to form a second sub motor. Current flow in the first set of coil windings is controlled using a first pulse width modulation (PWM) having a first switching sequence and current flow in the second set of coil windings is controlled using a second PWM having a second switching sequence. A control device measures the current flow in each of the first set of coil windings, and upon determining that the sum of the current flow in the first set of coil windings is substantially non zero, derives the first PWM values from voltage values used to generate the second PWM. The second PWM switching sequence may be staggered relative to the first PWM switching sequence. Thefirst PWM values may be derived from a quadrature axis voltage value and the direct axis voltage axis value used to generate the second PWM.

Description

technical field [0001] The invention relates to a control device, in particular to a current determination device for an electric motor. Background technique [0002] An electric motor system generally includes an electric motor and a control unit arranged to control the power / torque generated by the electric motor. Examples of known motor types include induction motors, synchronous brushless permanent magnet motors, switched reluctance motors, and linear motors. Commercially, three-phase motors are the most common type of motor available. [0003] Three-phase motors typically include three coil sets, where each coil set is arranged to generate a magnetic field associated with one of the three phases of the alternating voltage. [0004] In order to increase the number of magnetic poles formed within the motor, each coil set will typically have multiple coil sub-sets distributed around the motor driven to generate a rotating magnetic field. [0005] The three coils of a th...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/18H02P21/22H02P27/08B60L15/20
CPCH02P21/14H02P21/18H02P21/22H02P27/08B60L15/20H02K21/22H02K3/28H02K11/33H02P2205/01H02P29/032Y02T10/72H02P25/22
Inventor 理查德·托马斯·伯克克里斯托弗·戴维·希尔顿
Owner PROTEAN ELECTRIC LIMITED